Full text of "73 Magazine (December 1981)"

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Are You Joe Ham's

Bob Cooper:
Guru of Satellite T

74«70"A

— —

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The 3K Classic/ X with heavy duty power supply and 10 meter operation is available for sale outside the
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ni/ /"*!„ The 2K Classic represents the culmination of years of

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73 Magazine • December, 1981 3

INFO

Manuscripts

Contributions in the form of manu-
scripts with drawings anchor photo-
graphs are welcome ar>d will be con-
sidered for possible publication. We
can assume no responstbifity for loss
or damage to any material. Please
enclose a stamped, self-addressed
envelope with each submission. Pay-
ment for the use of any unsolicited
material will be made upon accep-
tance. AM contributions should be di-
rected to the 73 editorial offices.
"How to Write for 73M guidelines are
available upon request

Editorial Offices:

Pine Street

Peterborough NK 03458

Phone: 603-924-3873. 924-3874

Advertising Offices:

Elm Street

Peterborough NH 03458
Phone:603-924 7136

Circulation Offices:

Elm Street

Peterborough NH 0G45B

Phone; 603-924-7296

Subscription Rates

In the United States and Possesions;
One Year {12 Issues) $25,00
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Elsewhere:

Canada— $27.00/1 year only, LLS.
funds. Foreign surface mall— S35 .00/ 1
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To subscribe,

renew or change

an address:

Write to 73 Magazine, Subscription
Department. PO Box 931, Farming-
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73 Magazine (ISSN 0096-90 10) is pub-
Sished monthly by 73, Inc. 80 PJne
Street Peierborough NH 03458, Sec-
ond class postage paid at Peterbor-
ough NH 0345B and at additional mail-
ing offices. Copyright (c) 1981 by 73L
Inc. All rights reserved. No part of this
publication may be reprinted or other-
wise reproduced without written per-
mission from the publisher, Microfilm
Edition — University Microfilm, Ann
Arbor Ml 461 06,

Antenna Baluns

Model PBM4.95

350 watts PEP. 1 .7 to 30 MHz. Low cost. High performance. Just
right for transceivers. Specify desired ratio from table below:

Model

Ratio

Matches
50 ohms to

PB-1

50 ohms

PB-1. 5

1.5

75 ohms

PB-2

100 ohms

PB-3

1 50 ohms

PB-4

200 ohms

PB-5

250 ohms

PB-6

300 ohms

PB-7.5

7.5

375 ohms

PB-9

450 ohms

PB-1 2

600 ohms

PB-1 6

800 ohms

Model 1K

$32.50

1 Kw CW, 3Kw PEP input. 1:1 or 4:1

Model 2K
$52.50

2 Kw CW, 6 Kw PEP input. 1:1 or 4:1

Beam Balun
$57.50

2 Kw CW, 6 Kw PEP input. 1:1 or 4^

MasterCard

Send for FREE Catalog

To order, add $3 shipping/handling. California residents add sales tax.

4 73 Magazine * December, 1981

Cold Comfort

— an HT to the rescue at fifteen below

KA1D 12

Beginner's Guide to Antennas

—not iust tor Novices

Mil "4

Review:

The Rex Bassett TLM-2 Mobile Mount

— banish your fear of flying KAHR 18

Update Your CW Music Keyboard

— play it again, Sam .K5KL 20

Review:

The Daiwa Infrared Wireless Microphone

— is the mike cable obsolete' K4TW[

What's It AM About ASCII?

— RTTY technology update

W4RI.WB4Af'R

Review;

The Kenwood TR-7730 Transceiver

— let's get small'

KA1LR

N38AH

dec. 81

MAGAZINE

WSJ I 100

Review:

The Radio Shack Pro-2002 Scanner

— a look at the Shack s latest

An Easy L-Meter

— you'll niied a frequency counter
Review:

A Quad for Two Meters

— the Palomar portable power picker-upper.

"Chopsticfc" Helical for 432

— satisfies your Phase III appetite 9M2CR 116

W8U 104

Joe Ham: The Consumer

— do you fit the mold'

Bob Cooper: Profile of a Pioneer

Satellite Channel Guide

^-part If

N6AVU 32

The Code Pet

^ — a Morse tutorial for Commodore's computer

AA0C 126

N6RK

WE5T5AT 44

Satellite Television Glossary

- part f. Satellite Television Handbook

No More Two-Tone Sidetone

— modit\ vouf AEA kever „

Monodes

— harbm^er of a new age

Breaking the Decibel Logjam

— how to cope with nothingness

KA1LR 128

orner

TVRO Receivers: The Inside Story

I— Satellite Central, part If... Gibson

130

s<im 136

Less Drain Is Your Gain!

— power-saving mods for the Wilson II and IV , KA3W 138

A Positive Supply with a Negative Chip

— oneway to solve the parts problem K9MLD 1 42

Review:

The Ace Portable Synthesized VHF Receiver

— for those times when listening is enough W6FX 68

Never Say Die-6, Ham Help- 108, 137, 178, 195, 199, 1981 Index- 144, Reader Service-162, Fun! -164,
Awards- 166, Corrections- 168, 193, Social Events- 170, DX— 174, Contests— 176, Letters- 185, New
Products- 188, FCC -190, RTTY Loop- 191, OSCAR Orbits- 194, Kahaner Report- 196, Looking West- 197,
Dealer Directory — 226, Propagation— 226

Cover: Photo by Paul Grupp KA1LR.

73 Magazine ■ December, 1981 5

W2NSD/1

NEVER SAY Dl E

editorial by Wayne Green

THE FCC ADVISORY
COMMITTEE

In order to keep in closer
touch with those being regu-
lated, the FCC has established
advisory committees, made up
of people in the regulated in-
dustries, to work with them on
needed regulations. In the am-
ateur radio field, this group
Is the National Industry Advi-
sory Committee* Amateur Radio
Service Subcommittee (Ml AC),
The group has 17 members, of
whom about two-thirds normal-
ly attend the yearly or twice-
yearly meetings.

The most recent meeting was
held at the FCC headquarters in
Washington with eleven mem-
bers present. More of the mem-
bers are interested and influen-
tial amateurs than industry rep-
resentatives, with the only true
industry representatives being
me from 73, John Lindhofm from
QST, Chris Imlay from QSTt and
Alan Dorhoffer from CQ.

The recent meeting discussed
aspects of getting local govern-

W2NSD/1 ONTHE-Alfl

SCHEDULE

DECEMBER, 1981

1 80*40 Phone

8 20 RTTY

15 20 Phone

22 40-20 CW

29 20-15 Phone

On both phone and CW
nights, look for us in the
first 25 kHz of the General
portion of each band. On
the RTTY night, look for
us between 14,090 MHz
and 14.100 MHz. We'll be
on the higher band first.
Sessions run from 7:00 to
10:00 pm eastern time.

ment cooperation for emergen-
cy communications, possible
help from MARS stations, and
so on. We had been asked for a
report on high-speed transmis-
sions for emergency communi-
cations and on the possibilities
of developing more amateurs
for emergency operations. I
made the following report,
which you may find of interest.

Amateur Radio Emergency

Commu n i ca t i ons;

The Future?

AE the 1351 NIAC meeting I dis-
cussed the matter of the lagging
American technology in electronics.
Since thai time this has been a mat-
ter of continued interest in the gener
al media, with articles in The Wati
Street Journal and several other well*
read publications.

It was my concept that much of the
explanation for this increasing tech-
nology gap lies in the moribund na-
ture of amateur radio in our coun-
try. . .particularly as compared with
the vital and growing interest in ama-
teur radio in Japan. I felt that this
stemmed from the proposed "incen-
tive licensing" rules of 1963. at which
time amateur radio in the US
stopped its growth for an eleven year
period. Indeed, had our ranks contin-
ued to grow at the rate a! which they
had been expanding from World War
II until that time, we would have

reached our present amateur popula*
tjon in about If

The result of this has been a seri-
ous lack of the most precious life-
blood of amateur radio, the 14- and
15-year-old newcomers. Even the
spurt of interest in the mid-1970s
which resulted from the national
enthusiasm for Citizens Band ra-
dio brought In more middle-aged re-
cruits than youngsters. Unfortunate-
ly, these are not the type of amateurs
who decide to dedicate their lives
to careers in electronics or commun i
cations. Thus we have a rapidly aging
group of amateurs, with the large part
of them well beyond the age when we
would expect them to contribute to
the advance of American technology.
This largely comes from people in
their 20s and 30s. not in their 40s
and 50s.

One possible solution to the prob-
lem would be to encourage the intro-
duction of amateur radio into as
many high schools as possible. This
Is the age recruit which we need, . .
which our country needs. Without
this group Joining our hobby I feel
that America can only face further
humiliation at the hands of the Japa-
nese engineers and technicans. Fur-
Iher, should any international con-
flict develop, we will have to be very
sure that the next time we have Ja-
pan on our side. Indeed, if Japan had
introduced the no-code ham license
in the 1930s it is possible that the war
couid have turned out differently. We
should remember that Hitler publicly
regretted his stopping of amateur
radio In Germany and ascribed much

of the failure of Germany in the war to
the resultant loss of technicians

Since we all agree that another in-
ternational war is unthinkable and
impossible, there is no real reason to
even worry about our technical peo-
ple who might be needed in that in-
stance. Still, that does leave us with a
gradual falling behind in business as
the Japanese, with their army of engi-
neers and technicians, surpass us in
calculators, watches, television sets,
video recorders, video players and
disks, tape recorders, hi-fi systems,
amateur radio equipment, all com-
munications equipment, telephones,
test equipment. . and so on.

it seems to me that the further we
allow ourselves to fall behind in
technology, the more we will fall
behind economically. I have visited
I us I about every part of the world in
recent months and on every front I
find the Japanese firms getting
ahead of us, Despite the serious
problems our Administration is hav-
ing In trying to cut down on ex-
penses, it may be lime for a White
House symposium on this critical sit-
uation, with some dramatic mea-
sures to tackle the problem.

There have been two major techno-
logical revolutions In the amateur
radio field In the last twenty years.
The first was the introduction of
single sideband transmissions in the
late 50s. which resulted in a change
to that mode for virtually all phone
shortwave communications on the
amateur bands. . . and its use by the
military. The second major lechnol*
ogy change was the development of
the FM transceiver and repeater
which came along in the late 60s and
developed through the 70s. Smce
then, despite great leaps ahead in
digital and integrated circuit technol-
ogy by industry, little change can be
seen in our ham bands.

The groups of amateurs working
for 73 Magazine are hard at work on a
new technology, This will be intra*
duced on twenty meters, probably on
H,100 kHz, as an on-the-air bulletin
board. It is our plan to have a radio
transceiver system which will auto-
mat I caMy answer queries from other
stations on that frequency, sending
at first a menu of the available mate-
rial on the bulletin board.

As an example of how this would
work, a station would send a call for
W2NSD/1 and sign its call. W2NSD/1
would then respond with a list of op-
tions of information. Let's say the in-
quiring station opts for #1, a current
DX advisory. W2NSDH would then

WIN WAYNE'S HAM SHACK

PRIZEWINNERS

Congratulations to the following lucky winners of ham gear in our recent subscription pro-

motion!

Grand Prize

Cart F, Bogart WA7 J WW/W A70TR

FT-901DM.MUV2500,

Reno NV

System 33, rotator

1st Prize

David A. Behar

TS-700A, Hustler

Seattle WA

Beam, Bird Wattmeter

2nd Prize

Judith A. Posego N9BKQ
Lockport IL

TS-820S

3rd Prize

James T Douglas K3FHC

TR-7800

Washington Borough PA

4th Prize

Gerald I. Miles WA4KJK
Nashville TIM

Realistic DX-300

6 73 Magazine * December, 1981

mi »rr

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70O

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UFATT

*' Oh

IF SHIFT

CAL

WI*IWO

°? TS-Q3Qs

AUX

RF GAIN

HEATER POWER

ON n*j

rV'

TRA

ive

IF shift, digital display, narrow-wide filter switch

The TS-530S SSB/CW transceiver is
designed with Kenwood's latest, most
advanced circuit technology, providing
wide dynamic range, high sensitivity,
very sharp selectivity with selectable
filters and IF shift, built-in digital display,
speech processor, and other features for
optimum, yet economical, operation on
160 through 10 meters.

T3-53QS FEATURES:

■ 160-10 meter coverage, including three
new bands

Transmits and receives [LSB, USB, and
CW) on alt Amateur frequencies between
L8 and 297 MHz. including the new 10,
18. and 24 MHz bands. Receives WWV
on 10 MHz.

• Built-in digital display

Large, six-digit, flu orescent- tube display
shows actual receive and transmit fre-
quencies on all modes. Backed up by
analog subdiaL

• IF shift

Moves IF passband around received
signal and away from Interfering signals
and sideband splatter.

- Narrow/wide filter combinations
Any one or two of three optional filters
. . .YK -88SN [L8 kHz) SSB. YK-88C
(500 Hz] CW. YK-88CN (270 Hz) CW , , ,
may be installed for selecting (with "N-W"
switch] wide and narrow bandwidths on
CW and/or SSB.

Wide receiver dynamic range

Greater immunity to strong-sign a J over-
load, with MOSFET RF amplifier operating
at low level for improved DVfD character-
istics, junction FETs in balanced mixer
with low noise figure, and dual resonator
for each band.

Built-in speech processor
Combines an audio compression amplifier
with change of ALC time constant for
extra audio punch and increased average
SSB output power with suppressed
sideband splatter.

Two 6146B's In final

Runs 220 W PEP/180 W DC input on

all bands.

• Advanced single -conversion PLL system
Improved overall stability and improved

transmit and receive spurious
characteristics.

Matching accessories for fized-station operation:

• SP-230 external speaker • AT-230 antenna tuner/
with selectable audio filters SWR and power meter

* VFO-240 remote VFO • MC-50 desk microphone
Other accessories not shown:

Adjustable noiae-blanker level
Pulse-type (such as ignition) noise is
eliminated by built-in noise blanker, with
front-panel threshold level control.

RF attenuator

The 20-dB RF attenuator may be switched
in for rejecting IMD from extremely
strong signals.

Optional VFOs for flexibility
VFO-240 allows split-frequency operation
and other applications. VFO-230 digital
VFO operates in 20-Hz steps and includes
five memories and a digital display

RiT/xrr

Front-panel RIT (receiver incremental
tuning} shifts only the receiver frequency,
for tuning In stations slightly off fre-
quency. X1T (transmitter incremental
tuning) shifts only the transmitter fre-
quency, for calling a DX station listening
off frequency.

More information on the TS-530S is
available from all authorized dealers of
Trio -Ken wood Communications
1111 West Walnut Street Compton,
California 90220,

^KENWOOD

. . . par fitter in amateur radio

• VFO-230 remote digital
VFO with 20-Hz steps, five
memories, digital display

• TL-922A linear amplifier

• SM-220 Station Monitor

• KB-1 deluxe VFO knob

• PC-l phone patch

• HO10 digital world clock

• YK-88C (500 Hz) and
YK-88CN (270 Hzl CW
filters and YK-88SN (1.8
kHz) SSB narrow filter

• MC-30S and MC-35S
noise-canceling hand

• HS-5 and HS-4 headphones microphones

Specifications and prices are subject to change without notice or obligation.

STAFF

PUBU&HEft/EDITOR
Wayr>r* Qraen W2NSDM

EXECUTIVE V*CE PRESIDENT
Sharry Smyihe

ASSISTANT PUH LI SHEA/EDITOR
Jefl 0*Tmv W83STH

ASSOCIATE PUBUSHEJVDI RECTOR

OF PUBLICATIONS

£d**'G> Punnan WA1UFT

MANAGING EDITOR
Jotin Burnett

ASST. MANAGING &0FTOR
SuftAn PfaiLbrick

EDITORIAL ASSISTANTS

Nancy Noyd

Richard Pneni*

REVIEW EDFTOR

Paul GruppKAtLR

CONTRIBUTING EDITORS

Ctins Brown KA1D

Tkrn Daniel NflPK

Alya^n Grupp N1BEJ

Larry Kfltianer WB2NEL

ADM ! N1STRATIVE ASSISTANT
Pat Gmftam

Rotwrt Rakar WB2GFE
BMP Gwney KE7C

SanQflf Green

Dave Ingram MTV. j

Joe Kaa»f G3ZC2

D* Marc Leavey WA3AJR

Davt Mann K2AGZ

BUI Pasiernah WA6HT

Prjler Slark K20AW

PRODUCTION MANAGER/

PUBLICATIONS

Nancy Salmon

ASST PRODUCTION

MANAGEB/PUBtlCATlONS

MicftM* Murphy

ADVERTISING GRAPHICS
MANAGERS
ftODerrl On?nr

£kuce H&
jane Pteston
Oennift Cnnsten&en

PRODUCTION
Frances B anion

Fiona Davios
Linda Drew

Sandra Duhelte
Kennalh Jackson

Dranne Rit&on

Pair ton Mackowshy

Th«f««a Oatebc

Deborah Si one

JuOi Wimbefly
Donna Woh-11 artti

PHOTOGRAPHY
WTlu#rrt Heyooipn

^e-rtt Anderson
Paul Bacicn

Kulrvy fiifkebak

Bryan Hastings
Thomas- VMleneuve

TYPESETTING

Sara Bedell
David Hayward

• ily Smith

Karen Slewan

Mlchela Deeftoclrers

Steve Jewetl

Ann Lord

CORPORATE CONTROUffl

Hoy A Johrtson

ESECUTW1 ASSISTANT
teatrice O Nei<

ACCOUNTING MANAGER
Knud KftHsr KV4GC

CIRCULATION MANAGER
Debra Boudn&au

CIRCULATION
Doris Day

Pauline John stone

BULK SALES MANAGER
G'nr.iu Boudrieau

AOVERTISJNG

603-924-7138

JrmGrayWtXU Mgr

Nancy C-amoa, Asst Mgf

Rosa Kenyon KA1GAV

come on and send all of the latest in-
form alion on active rare DX stations,
including their known frequencies,
schedules, QSt information, name of
the operator, and so on. Al the end of
the transmission Ihe inquiring sta-
tion would have an option of sending
unlisted information for possible in-
clusion on the bulletin board. This
would be received at W2NSDH and
stored for editing by the operator, it
then could be added to the #1 list of
information.

Number I wo might be a list of con-
tests during the next few weeks, with
scoring information, where 10 send
logs, where to get full details, and so
on. Again, further information could
be sent to W2NSD/1 at the end of the
bulletin transmission.

Plans are to have lists of bam-
tests and conventions, the latest
FCC releases, proposed rule
changes, lists of nets and their fre-
quencies, changes in repeater calls
or channels, VHF information, RTTY
Information, SSTV information r . .
and so on .

En addition to encouraging the use
of advanced digital techniques over
the air, these transmissions would be
experimental in nature, helping ama-
teurs develop systems capable of
communications via ASCfl at 300- .
1200-. and 9600-baud speeds. The re-
sponse of W2NSD/1 would be set to
match the calling speed of bulletin

board users. 9600 baud can be sent
within the confines of an amateur
voice channel and, when you con*
sider that this is approximately 8500
words per minute, it is an efficient
means of exchanging information.

Let's carry this on to the next step.
How does this have anything to do
with emergency communications,
the basic function of NlAC? Most of
the emergency nets of today are on
voice and are incredibly inefficient as
far as handling volumes of traffic Is
concerned. Let's look into the future
and see where our high-speed auto-
malic digital communications exper-
iment is taking us.

In a few years we may be using
small keyboards on which we will be
able to type messages. Indeed, these
are already on the market, with the
Radio Shack TRS-B0 pocket comput-
er selling for $230. Let's Imagine that
instead of just calling a net control
station to send a message, the net
calls each station in the net in turn
and asks if there Is any traffic. With
digital calling, this polling of a net
could be done in milliseconds, not
minutes with endless repeating of
callsigns. At 3500 words per minute,
the net control could call each partic-
ipating station and ask for traffic in
less than a second. If a message has
been typed on the pocket computer,
the station would automatically
dump it over the air when polled. The

control station computer would read
ihe address and pass the message
along to the addressee instantly.
Wilh a network like this it would be
possible to handle thousands of
times as much traffic as at present
with no tosses or errors. Further,
links with low-band long-range sta-
tions could be set up as part of the
emergency network . ... even to link-
ing through satellites via microwave
transmissions.

This is not a gee-whiz dream of Ihe
future Everything needed has al-
ready been invented, so ail amateurs
have to do is apply the technology we
already have developed in the com-
puter field to radio communications.
This should be good for amateur ra-
dio in that it will generate a new inter-
est in communicating via this new
technology. It will be good for Indus-
try In that ali amateurs will be want-
ing new equipment. And It will enable
amateurs to provide an emergency
communications system far beyond
anything imagined a year or so ago.

We are taking the first step with
W2NSD/1 in the establishment of Ihe
radio bulletin board. We will be ask-
ing the FCC for permission to experi-
ment with 1200- and 9600-baud trans-
missions. We will be publishing a
vast amount of information on this

Continued on page W0

Well ... I Can Dream, Can't I?

by Bandel Linn K4PP

"We've discovered a new high-speed way to learn the code! This shot will
make you a 25-word-per-minute man immediately !"

8 73 Magazine * December, 1981

Reader Service tot facing page *»■ Tfr-

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Cold Comfort

an HT to the rescue at fifteen below

One thing was certain
_ this night would be
very cold As I hunched
over my sputtering stove in
the fading twilight, melting
more snow for drinking
water, I wondered how long
my HT would continue to
perform.

Before I had left on this
winter backpacking trip to
New Hampshire's White
Mountains, friends had told
me tales of liquid crystal
displays freezing solid, then
bursting, at zero degrees
Fahrenheit, of fully charged
nicads incapable of pow-
ering even the receiver por-
tion of an H I at minus ten
Now, at 4:00 pm on this dull
and snowy afternoon, the
temperature was already
minus eight degrees I knew
it would go much lower dur-
ing the night the question
in my mind was, would the
HTquit?

I was hiking alone in
these frigid mountains, my
only link to the outside
world a compact package
of imported electronics

12 73 Magazine • December,

powered by a pitifully small
battery pack. I intended to
use my Kenwood 2400 HI
to access a two-meter
repeater located on a
mountaintop eight mites
jway. In case of trouble,
the HT would be my only
way of yelling "Mayday."

Suddenly I was aware of
the sounds hanging in the
ho/en evening air: the roar
of my small stove and the
sweep of the wind-driven
snow. Something was miss
ing. The HT had been quiet
for a long time. The reassur-
ing CW ID of the Mount
Washington repeater had
not broken the squelch fur
at least half an hour. Preo<
cupied with stamping out a
firm platform in the deep
powder snow, setting up my
mountain tent, getting the
stove going, and making
leady for the long night
ahead, I had not noticed the
HT's silence Now that si
lence was overwhelming

With clumsy, mittened
hands I groped through my
pack tor the HT I wiped the

(frost from the LCD readout
and was relieved to see it
indicating 6.055 — the
wrong frequency. I had
inadvertently depressed the
RLV button while setting
the frequency to 6,655
earlier and was listening on
the repeater's input fre-
quency instead of its out-
put frequency, When I
restored the switch to the
normal position, I caught
the tail end of the cheerful
CW ID of KIOIQ/R, The
repeater was still working
and so was my HT I went
back to melting snow and
supper preparations as the
winter darkness slowly
tilled my campsite.

This trip had come about
as a combination of my in-
terests in winter mountain-
eering and amateur radio,
Andr by bringing tin HT
along. I was able to justify
doing something I normally
could not justify — making
the trip alone With the HT,
I would always be able to
reach the outside world

and, in the event of trouble,
would be able to let some-
one know where I was I
also thought it would be
fun to yack with my fellow
hams as I trekked through
the Presidential Range in
deep winter

The Presidential Range
lies in the White Mountains
of northern New Hamp-
shire. This wilderness area
provides the most challeng-
ing winter hiking and climb-
ing in New England The re-
gion is known for its foul
weather and, before the
anemometer blew away,
the highest wind gust ever
recorded on the surface of
the planet was clocked at
an incredible 231 mph on
Mt Washington's summit
At 6,288 feet, Washington is
no giant among mountains
Its reputation as a cruel
place in winter, however, is
first-hand knowledge to all
eastern hikers and climbers
who have spent time scut-
tling across its windswept
slopes or scaling the walls
of its icy ravines.

1981

My plan was to hike into
the national forest south of
Mt Washington place a
high camp at tree line on
the Presidential Ridgef
spend the night, and then
hike down the ridge the fol-
lowing day, I hoped to pass
over the summit of Mt,
Washington before heading
for civilization at Pinkham
Notch Camp I intended to
cover a total of thirteen
miles in two days, gaming
most of my altitude the first
day on the four-mile ap-
proach up the ridge.

Weather, of course,
would play a major role in
the success of any plan. The
winter of 1980/81 was unus-
ually cold in New England
and the weekend I chose
for my trip was no excep-
tion I was well aware of the
consequences that had be-
fallen those foolhardy
enough to be caught high
on that exposed ridge in
severe winter conditions.
Wind-chill factors in excess
of — 1 00 degrees were com-
mon and, if the weather and
winds did not cooperate,
my plans would have to
change.

I had no success per-
suading any of my friends
to go with me, Perhaps the
ominous weather forecasts
which predicted snow on
Friday night and Saturday
with gradual clearing and
plunging temperatures on
Sunday dissuaded them. In
any case, as I hiked along
Saturday morning under my
fully-loaded, forty-pound
Kelty pack, I was glad to be
alone, Working my way up
through the forest, the only
sounds intruding on my
solitude were the rhythmic
swish of my snowshoes
through the powder and the
occasional ID of the Mt
Washington repeater.

The Mount Washington
repeater has the widest
coverage of any machine in
New England, Situated six
thousand feet above sea
level, it provides reliable
communications over a
300-mile, five-state area
Though it shares its moun-

A Sunday morning self-portrait at fifteen below zero.

taintop with TV, FM broad-
cast, and commercial mi-
crowave installations, it has
few intermodulation or
desense problems.

The machine is privately
owned and is open to the
public, The only contribu-
tion requested from the
large number of daily users
is good operating practice.
The machine is supported
by equipment donations
from hams in the north
country, and maintenance
and repairs are carried out
by its licensee, A I Ox ton
K101Q and by Bill "Mac"
Beal W1PNR. The central
role Ox ton and Beal play in
the machine upkeep and
maintenance is the key to
its reliability in the harsh
mountain environment.

Luckily for the users,
both Al and Mac spend con-
siderable amounts of time
on the summit of ML Wash-
ington in the course of their
duties as staff members of
the Mount Washington Ob-
servatory. The Observatory,
a non-profit research facili-
ty which operates year-
round, is rich in folklore and
ethereal nocturnal visitors.
Rumor has it that at least
one ghost is in residence on
the summit, on wild nights

when the wind is whining,
he gives certain Obser-
vatory staffers the pleasure
of his company, Oxton and
Beal are more concerned
with repeaters than rumors,
however.

Their repeater is a VHF
Engineering kit. A scratch-
built control system pro-
vides tone decoders and in-
terface for the autopatch,
audio processing, link to
another machine seventy
miles away in Concord NH,
and auxiliary inputs
Duplexers are by Sinclair
and were provided by the
Northeast FM Repeater As-
sociation The special Gam
half-wave vertical antenna,
enclosed in a fiberglass
radome, is fed with heliax
cable cast off by the neigh-
boring TV station. Transmit-
ter output is 18 Watts, 20
Watts ERP The repeater is
voice-accessed and the
trustees encourage users to
say nice things when bring-
ing the machine up. The
dentist's office "Ahhhhhh"
is frowned upon. Normal
repeater power is drawn
from ac mains, but the ma-
chine is capable of running
on solar power and has
even been run on wind
power.

That night there was no
shortage of wind for power
generation on Mt. Wash-
ington. Though it bullied
my tent, I was comfortable
within the narrow confines
of my mummy sleeping
bag. Drawn tightly down
across my face and around
my shoulders, the bag pro-
vided a life-sustaining en-
vironment. The tempera-
ture within the bag was a
humid seventy degrees
Four inches away, outside
the bag's nylon and fiberfill
walls, the temperature was
flirting with the bag's
minimum comfort rating.
fifteen degrees below zero
I had placed two full-length
closed-cell foam pads be-
neath me which provided
1-1/4 inches of insulation
from the chilling, hard-
packed surface of the snow
While I stayed on the pads,
I stayed warm

In addition to my b'2"
frame, I had managed to
stuff a quart of water, the
inner liners of my hiking
boots, assorted articles of
clothing, a bag of GORP
(good old raisins and pea-
nuts), my HT, a spare nicad
pack, and a headlamp into
the bag with me. These
carefully chosen items

Magazine * December. 1981 13

were the only things that
would not be frozen solid in
the morning and, as long as
1 didn't roll over too often, I
was totally content,

I had been dozing in the
bag for about two hours
when the Granite State FM
Net was called to order.
This public service net
handles national and
regional traffic in two
separate sessions and nor-
mally convenes at 7:00 pm
on the repeater in Concord
NH Once the net is under-
way, the Concord and Mt.
Washington repeaters are
linked, providing coverage
of the entire state. For some
reason, however, the link
was not functioning and,
while I could hear the net
proceedings from Concord
on my HT, I was not able to
check in. I wanted to pass a
piece of routine traffic to a
friend and fellow ham in
Bo/eman MT who had been
a frequent companion on
many previous winter trips
Without the link, however,
it was doubtful that I would
be able to get my traffic
through.

Shortly after the net
began, net control, N1 ALM,
briefly left the Concord ma-
chine and appeared on the
Mt, Washington repeater
asking if anyone had out-
going traffic for the net As I
gratefully passed the text of
my message to htm, we
both had to laugh about the
propensity we hams have
for establishing and main-

taining communications
between weird locations.
Like coral reefs, maximum
security prisons, desert
ghost towns, or mountain-
side campsites. Dana's
check number matched
mine on the first count and
while I languished in my
sleeping bag, my message
began its relay to Montana.

Outside, the weather was
deteriorating. The constant
swish of built-up snow
sliding off my tent and the
increasing staccato of the
wind did not bode well for
the next day's planned
route. The exposed ridge,
lashed by the northwest
wind, would be drifted with
new snow making travel la-
borious and time-consum-
ing. I lay mulling over my
plans and reminded myself
that tht1 trip was supposed
to be fun.

I was almost asleep when
the squelch was broken by
my own callsign The gang
at W2NSD/1r 100 miles
south in Peterborough, was
trying to raise me. We had
agreed to keep an 8:00 pm
sked Saturday evening and
at 7:45 pm they were anx-
iously calling. Most of my
fellow staffers were sure I
was mad for making the trip
in the first place and it was
a skeptical and curious
group that gathered at the
73 ham shack to hear of my
progress.

After assuring them that I
was not in a bar somewhere
within range of the repeat-

The winter landscape — more fit for a hobbit than a man.
14 73 Magazine • December, 1981

er, I filled them in on what I
had been doing since leav-
ing Peterborough As we
spoke to one another across
the intervening miles, I
imagined their world as it
was at that moment: a
warm, well-lit, fully-
equipped ham shack
crowded with friends enjoy-
ing themselves. It was very
different from the cold,
dark world I was in. For a
moment, I envied their
comfort and camaraderie.

AC1Z was on frequency
when I concluded my sked.
Willy, an employee of the
TV station on the summit of
Mt. Washington, volun-
teered to go next door to
the Observatory and get the
latest weather forecast for
me. It was not good. The
forecast called for bitter
cold, widely-scattered snow
squalls for the next twenty
four-hours, and winds gust-
ing to 100 mph. At that mo-
ment, it was minus twenty
degrees on the summit and
winds were gusting to b0
mph. I thanked him, ad-
mired his mettle, and then
shut down the rig and fell
asleep.

Sleep was fragmented
and Sundays dawn came
slowly The orange walls of
my tent gradually picked
up color as the sun rose
behind an icy scrim of fog
and blowing snow I lay
awake for a long time in my
sleeping bag trying to psych
myself up for the inevi-
table. The hardest part of
any winter camping day is
leaving a warm sleeping
bag and getting into cold
clothes, frozen boots, and
an icy world Despite being
in my fourteenth hour in my
bag, it was easier to lay
there pondering the best
(and quickest] scenario to
follow in getting dressed
than to actually get out of
the bag and dress,

I snapped on the HT and
passed time listening to the
idle chatter of other early
risers on this frigid New
Hampshire Sunday morn-
ing. Occasionally, a clipped
New England accent would

comment on everyone's
favorite topic, the weather.

"Ayup Marshall, a might
cold here this mahnin.
About twenty-five below.
Acourse that's on the windy
side of the bahn."

As my fellow hams had
their second and third cups
of coffee, I struggled to get
my stove going. Repeated
priming finally heated the
generator up enough to sus-
tain combustion and soon I
too was contemplating the
morning's cold over a hot
cup of Java,

It has snowed heavily
during the night and the
stubby, frozen shapes here
at tree-line were a more ap-
propriate landscape for a
hobbit than a ham. The
wind-driven snow had
sculpted grotesque and
beautiful figures during the
night as it packed into the
scrub growth and pucker
brush and fresh drifts
covered even the deepest
of yesterday's tracks.

Once I was out of my
bag, the morning cold kept
me moving Standing in one
place for any period of time
invited the relentless ad-
vance of the cold up
through my boots and into
my body. To keep warm, I
busied myself with break
ing camp — a reluctant
sleeping bag was forced in
to its small stuff sack, dirty
pots left to freeze were
chipped clean of breakfast
remnants, and my tent was
folded and forced into my
pack.

The weather was as fore-
cast Clouds and blowing
snow swirled around me as
I wrestled my pack onto my
back. As soon as I had it on,
the HT I had carefully
zipped into a side pocket
came alive N1AHN, a
friend I had spoken with the
previous day, was calling to
check on my progress. John
was ten miles away in the
village of North Conway
After a short chat with him,
I moved off into the storm
feeling good that a local
was around and interested.

Conditions deteriorated

with each foot of altitude I
gained. By the time I was
above the last of the scrub,
it became obvious to me
that I would not be able to
continue the traverse, The
poor visibility meant that I
would be walking compass
azimuths on that wild ridge
and, should I have to back*
track, would be walking
directly into the full force
of the wind. Frostbite was a
definite possibility and as I
stood with my back to the
gale, peering down the
ridge, I had to remove my
met a I frame eyeglasses
because they were drawing
heat out of my skin so rap-
idly that my cheeks and
temples were losing sensa-
tion. My windpants and
anorak hood drummed
wildly in the wind, and
through the tunnel vision of
my wool balaclava, I saw a
landscape no sane person
would inhabit

I couldn't resist moving a
short distance down the
ridge and breaking out the
HT for a quick test, how-
ever I lifted six distant
repeaters from my high
point and, as each one
came up, 1 announced that
KA1 D/portable, Presiden-
tial Ridge NH, was listening.
Thankfully, no one took the
opportunity to chat, and I
rapidly retreated toward
the relative security below
tree line.

While breaking my way
down the trail, I managed
to raise a friend and let him
know of my change in
plans. Ken W1NFE was lo-
cated in Bretton Woods, a
small hamlet at the foot of
the mountains. We agreed
that I would let him know
when I was safely back at
the trail head I skied, slid,
and slipped the four miles
off that ridge thinking of
hot showers, hot food, and
cold beer. In a few hours, I
was down.

The temperature at the
trail head was minus four-
teen, but it was warm when
compared with the cold I'd
felt up on the ridge, I
flopped my Kelty on the

* mi «- i

« am

Swirling clouds and wind-driven snow on the Presidential
Ridge.

snow and began fumbling
through its labyrinthine
pockets for my car keys. As
I listened for what I thought
would be the final time to
the ID of the Mt. Washing-
ton repeater, it occurred to
me that my Kenwood 2400
HT was one of the more
reliable companions I have
had the pleasure of hiking
with It didn't freeze up and
performed well under less
than ideal conditions.

Unfortunately, I was not
out of the woods once my
hike was over. I twisted the
key in the ignition and after
a few lethargic turnovers,
the engine fired to life. I
smugly congratulated my-
self for the care I had taken
in tune-up and battery
maintenance while I habit*
ually glanced at the oil
pressure gauge. My smug-
ness disappeared when I
saw U resting on zero I anx-
iously let the engine idle for
ten seconds, twenty sec-
onds, a long minute. The
gauge never moved. Worse
still, the tappets were grow-
ing gradually noisier. Ap-
parently, my adventure was
just beginning. I shut the
engine down and sat in the
cab with a sick feeling
growing in the pit of my
stomach. As I went through
the mental gymnastics of
what could be wrong, the
inside of the windows
began to frost up, enclosing
me in an icy, translucent
cave

I ruminated on the situa-
tion for several minutes
when that most noble of
human traits, blind opti-
mism, took hold. I simply
said to myself, "This can't
be happening. I'll just start
this thing up and all will be
well/' So, I did and it
wasn't The oil pressure re-
mained zero while the en-
gine clattered away alarm-
ingly, I admitted to myself
that I had a problem.

Sitting in the sub-zero in-
terior of a disabled vehicle
thirty miles from the near-
est garage with night com-
ing on gets old quickly. The
images of hot showers and
hot food I had conjured up
hours earlier on the trail
were still fresh in my mind
and I resolved to somehow
escape the developing de-
bade, Then it dawned on
me: For the first time in
nearly twenty years of ham-
ming, I had — if not an emer-
gency—at least a large
bummer on my hands which
could be minimized by ham
radio I reached for the
mobile rig, but before I
could turn it on it occurred
to me that I should be using
the HT instead. This was the
kind of situation I had
brought it along for in the
first place and it seemed fit-
ting to use it to extricate
myself now.

My first call was to
W1NFE. Ken was the clos-
est and he answered almost
immediately After I gave

him a brief description of
my problem, he took the
situation in hand. A tow
truck was reluctantly dis-
patched—no small accom-
plishment on a country Sun-
day afternoon. The cheap-
est motel in town was
alerted to expect an unex-
pected guest and a few res-
taurant recommendations
soon followed, too

To say that the village of
Twin Mountain was desert-
ed when the tow truck
pulled me in is an under-
statement of considerable
proportion. Besides the
garage man and me, only a
few scroungy dogs roamed
the windswept streets. Noth-
ing could be done for the
van that nightr so I hoofed
off toward the motel that
Ken had suggested. One
other guest was in residence,
he too a victim of car trou-
ble. After we commiserated
briefly, I made a few phone
calls to find all the area
restaurants closed I then
went upstairs to settle into
the stillness of my room, lit-
tering it with layers of damp
clothes and thawing wool
knee socks while I munched
on the remnants of my trail
lunch. Then I headed for
the shower

Sitting on the edge of the
bed afterwards, flushed
with the warmth of a very
long shower, I resigned my-
self to an early and un-
eventful evening. I lavishly
kicked the room's thermo-
stat up another notch and
stretched out on the bed
waiting for something
tolerable to appear on the
only channel the rabbit-
eared TV would receive. To
my amazement, the phone
rang.

W1NFE had tracked me
down and was calling to in-
vite me to share dinner and
spend the evening with him
and his family At that mo-
ment, the world suddenly
looked brighter Ken soon
arrived and we headed out
to dinner in the twenty-be-
low night listening to the
familiar voices on the Mt.
Washington repeater.!

73 Magazine • December, 1981 15

The FT-ONE is the culmination of an all-out design project by Yaesus top
engineering team. Working without the usual cost constraints, Yaesu's
design group is proud to unveil the instrument they "always wanted to
design," a revolutionary blend of computer and RF technology.

GENERAL COVERAGE, ALL SOLID STATE

The FT-ONE is a full-coverage all-mode transceiver, equipped for
reception on any frequency between 150 kHz and 29.99 MHz, with
transmit coverage on all nine present and proposed amateur bands In
countries where permitted, ttie FT-ONE may be programmed to trans-
mit throughout the 1. 8-29. 99 MHz range.

KEYBOARD FREQUENCY ENTRY

Fully digitally synthesized, the FT-ONE uses a front panel keyboard for
initial frequency entry, Frequency change is then accomplished via the
main tuning dial or the pushbutton scanner, with tuning in either 1 0 Hz
or 100 Hz steps possible. Truly the eontesters dream, the FT-ONE
permits extremely fine tuning and instantaneous band change with
equal facility.

DUAL VFO SYSTEM

Ten digital VFO's with memory are provided, in conjunction with an
A-B selection scheme that allows instant recall ot any transmit,
receive, or transceive frequency desired For split-frequency
operation, such as on 7 MHz SSB, the operator may select TX on
VFG-A and RX on VFO-B, automatically storing the calling and
listening frequencies for each pile-up. For net operations, a non-
volatile memory board is available as an option, to eliminate the
possibility ot dumping memory,

FULL CW BREAK-IN

Recent advances in solid-state technology have finally made full CW
break-in r^jable enough to be incorporated into a Yaesu product. Now
you can select traditional semi-break-in (for use with amplifiers not
equipped for full break-in) or full high-speed break-in. When using
amplifiers so equipped, ttie keyer output lead may be interrupted vraa
rear panel jack and routed to the break- m sequencing input on your
amplifier.

SWITCHING REGULATOR POWER SUPPLY

Extremely compact and light in weight, the switching regulator power
supply reduces substantially the space required to produce the
operating voltages used in the FT-ONE, Highly efficient and uniquely
Stable, the switching regulator supply provides superb reliability in a
field of design long neglected by amateur manufacturers.

ELITE CLASS PERFORMANCE FEATURES

In addition to the full break-in and superb receiver filters, Yaesu's
design team packed the FT-ONE with subtle virtues that others might
have overlooked. Rear panel jacks allow the use of both an external
receiver and an independent receive antenna, such as a 160 meter
Beverage. While scanning, automatic halting on a received signal may
be programmed, . perfect for watching a band for openings. If you're
a DX-peditioner, an optional Curtis 8044 keyer board is available, so
you won't need an external keyer thai only wastes suitcase space And
if your amplifier fan is louder man it should be. there's even a micro-
phone squelch (AMGC) to reduce background noise pickup between
words and sentences1

ONE YEAR FACTORY WARRANTY

Because of the level of attention to design detail, parts selection, and
factory quality control, your FT-ONE is backed by a one-year factory
warranty for the original purchaser at retail. Prompt and meticulous
attention to your warranty needs will be provided by our Ohio And
California Service Centers, in addition, ail units sold in the United
Stales will be inspected and tested after clearing Customs, and will
include a Service Manual in the puchase price.

GAIN/INTERCEPT OPTIMIZED RECEIVER
FRONT END

Utilizing up-conversion with a first IF ot 73 MHz, the FT-ONE RF
amplifier stage uses push-pull power transistors configured to pro-
duce a typical output intercept of +40 dBm. The first mixer utilizes a
diode ring module followed by a low noise post amp, for optimum
noise figure consistent with modern day intercept requirements The
result is a receiver with a typical two-tone dynamic range well in
excess of 95 dB {14 MHz, CW bandwidth). Additional gam tailoring is
provided via a PIN diode attenuator controlled from (he front panef.

FILTERS READY FOR COMPETITION

Three filler bandwidths are available for CW operation (two for FSK!},
using optional 600 Hz or 300 Hz crystal fitters. Filter insertion losses
are equalized for constant If gain. Both IF Shift and Variable Band-
width are provided, and two CW filters may be cascaded, for
competition-grade selectivity. For SS8 work, the Variable Bandwidth
feature eliminates the need for costly 1 .5 kHz or 1 .8 kHz filters, as any
intermediate bandwidth may easily be programmed using the
standard, cascaded SSB filters To top it all off. a high-performance
audio peak and notch filter is standard equipment.

EXPANDED OPERATING DISPLAYS

Digital displays for the VFO Frequency, memory channel, and RIT
offset are provided for quick frequency identification. The large front
panel meter provides easy viewing of transceiver operating para-
meters, including final transistor collector current, input DC voltage,
FM discriminator center tuning, speech processor compression level,
and forward/reflected relative power.

NOT AVAILABLE AS OPTIONS

Its hard to believe that other manufacturers still insist on making such
essential items as a noise blanker or speech processor extra-cost
options . We find that these are less expensive to incorporate and more
reliable in operation when installed on our assembly line No AC power
supply is available as an option for the FT-ONE . either, it's equipped
for operatron from 100/1 10/1 17/200/220/234 volts AC. or 13.5 volts
DC And it goes without saying that there will not be an external VFO
offered for the FT-ONE — were confident tftat ten VFO's are quite
enough !

Experience the FT-ONE in your Authorized Yaesu Dealer's showroom today.
This may be the last Amateur transceiver you will ever own. +m

Warranty policy available upon request. SASEt please.

Specifications subject to change without notice or obligation.

VAtttl

WATT

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YAESU FT-QNI

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1081

YAESU ELECTRONICS CORPORATION, 6851 Walthall Way, Paramount, CA 90723

Eastern Service Ctr., 9812 Princeton-Glendale Rd., Cincinnati, OH 45246

(213) 633-400:
(513) 874-3100

Pau/5. Grupp KA1LR
73 Magazine Staff

The Rex Bassett
TLM-2 Mobile Mount

banish your fear of flying

The Rex Bassett TLM-2 mobile mount, with a VAC-2Q

antenna.

19 73 Magazine • December. 1961

HF mobile operation is
near and dear to my
heart, and I am always in
search of better ways to
cope with the necessarily
large and bulky equipment
One of the biggest prob-
lems seems to be mounting
the antenna. Whether you
use the ubiquitous Hustler
system, the Rex Bassett an-
tennas, or motorized won-
ders like Cubic's, you need
something to mount it on
that will support the consid-
erable load the antenna
presents while motoring
down the highway. The
mounts offered by the man-
ufacturers are rarely confi-
dence-inspiring. Mechani-
cal integrity and protection
of the coax connection are
the primary areas that need
attention.

The TLM-2 mount from
Rex Bassett solves the prob-
lems in both areas, as long
as your antenna fits a stan-
dard 3/8-24 mount. Best of
all, it doesn't require a band
around the bumper (which
won't fit many small cars).
The mount resembles an in*
verted teacup, with a thick
gray finish applied All
hardware exposed to the

elements is stainless steel-
On the bottom of the
mount is a threaded SO-239
connector. A single hole is
drilled through the bumper
or rear deck, and the mount
is screwed down with hefty
hardware and a thick rub-
ber washer. Once installed,
this mount isn't going any-
where—it's rock solid! The
SO-239 connector on the
other side of the mounting
surface is also an important
advance. If you mount the
antenna on the rear deck of
your car, problems with
water-logged coax are a
thing of the past. Installed
on the bumper, the coax
will need some sort of pro-
tection from the elements, I
have used Coax-Seal (avail-
able at most dealers) with
great success.

Rex Bassett's antenna
products have acquired a
reputation for intelligent
design and rugged durabil-
ity. The TLM-2 mount con-
tinues that tradition. For
more information, contact
Rex Bassett Electronics,
Inc., 1633 N.E. 14th Avenue,
Fort Lauderdale FL 33305.
Reader Service number
47b ■

Reatf&r Service tor facing page *r&J—

KDK MAKES 2 METER FM
SIMPLE AND EASY!

KDK INTRODUCES A NEW GENERATION OF 2 METER FM RADIOS.

The sparkling 2025A MKII is loaded with new features! East of operation is the design concept at KDK.

OOfi

S*S/F»WR

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3 -5

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Includes:

Touch Tone ^ Mikf
ORDER NOW DIRECT

• Features such as ten channel memory in two banks of five each, a
solid 25 watts of power, full MARS and CAP coverage from 143,000 Mhz
to 148.995 Mhz, plus built in memory retention for up to one year . , .
end much, much more makes this the radio of the year, ff you have been
watting to move up to a new model, or have wished for a radio with
"everything". . . KDK has it!

•The ten channel memory is easily addressable and you have two banks
of five channels each. You can even use both banks at once for odd splits.

•Standard 600 hi shift up or down. Band scan or memory scan. Memory
scan is easy. There is also band scan with upper and tower limits you can

choose yourself!

• Built in nicads for the memory retention which has drain in nano-amps,
not milli-amps* The internal hattery will hold the memory for up to one
year! No other radio offers you this feature.

• Fast and easy dialing. Full solid state dialing and you can choose from
the front panel either a fast or slow dial rate.

• No relays are used, only solid state switching. This eliminates a trouble
spot many radios encounter,

• KDK has also eliminated another trouble spot by completely hand
wiring each radio. No internal pFugs to become intermittent and no wire
wraps either, just good solid wiring.

ORDER NOW DIRECT
CALL TOLL FREE

800-

4141

This number for ORDERS ONLY!
Mail Order - COD - Bank Cards

■

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HOURS - 9:00 - 5:00 CST Monday • Saturday
Phone (615) 865-7949
Telex 80-8327

• KDK gives you one of the hottest receivers you can find. By using UHF
(not VHF) dual gate MOS-FETs with electronic auto tuning for the RF
amplifier and the first mixer, you have a combination of ultra sensitivity
and maximum quietness.

•The audio output stage in the 2025A Mk II uses an integrated circuit
which has internal protection against over voltage and shorted output
conditions. Plus it is a high audio output chip - just what you need in a
noisy mobile situation.

•The transmitter uses direct VCO varicap modulation for true FM. Your
transmitted audio sounds as it should; crisp, clear and natural.

•The power output stage of the 2025A Mk II will not break down even
with an infinite VSWR load, and uses heavy duty solid state antenna
switching with a four stage low pass filter. All this gives you an exception-
ally clean, spur free output.

• KDK has included an adjustable sub audible tone circuit which can also
be used for CTCSS or tone burst on transmit, Again, more features)

• Size is 2 7/10" high - 7 1/8" wide - 9 1/2" deep.

•You can switch from 25 watts to 3 watts low power.

•And, of course, the DC cable is included along with the microphone
and mobile mounting bracket

Write for brochure - Dealer inquiries invited!

Warranty information available at your dealer

Company reserves the right to change specifications without notice.

Exclusive LIS Distributor - Dealers Welcome!

ORDER DIRECT

OR AT YOUR DEALER"
Distributed by:

KDK DISTRIBUTING CO., INC.

617 SOUTH GALLATIN ROAD - MADISON. TN 37115

Phone 4615)865-7949

D. N. (Km Kittretl K5KL
703 Serenada Drive
Georgetown TX 78626

Update Your
CW Music Keyboard

play it again, Sam

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STROM

F/g. /. Wiring diagram for modified diode matrix. RA and Rg
values are not critical; however, a large deviation wilt cause
erratic operation. Rc- prevents truncated characters should
other keys be struck while the space bar is down. Resis-
tors— yA W; diodes— 1N914/1N4 148; capacitors— 0. 1 disc.

20 73 Magazine ■ December. 1981

Considering operational
features versus IC
count, cost, and ease of con-
struction, the Morse key-
board designed by Crom
WB9WRE is one of the best
keyboard bargains available
(73 Magazine, February,
1 979, p. 84). The author sug-
gests several options, and
the design readily accom-
modates others. One such
option, to make typing easi-
er, is described in this arti-
cle,

I found the basic key-
board awkward to operate
because of the key-interlock
feature which disables all
other keys while one is de-
pressed. Although other
keys may be struck, nothing
will come out— and that was
my problem: striking the
next key too soon resulted
in omitted characters.

The answer is n-key roll-
over. With n-key rollover,
second, third, etc., keys may

be struck while the first
and/or succeeding keys are
still held down, yet code will
go out in perfect sequence
{the capability exceeds the
demand).

The technique used by
Horowitz W1HFA for his
Compucoder {QSTf June,
1975), two resistors and one
capacitor in each keyswitch
lead, was adapted for this
modification, as shown in
Fig. 1, Essentially, the func-
tional difference between
the original WB9WRE diode
matrix and the modified one
is the duration of the key-
switch input. The static, or
rest, condition of data buses
K0-K7 and the strobe input is
high in both cases* When a
key is struck, diodes in the
key-switch line take selected
data buses low to form the
8-bit binary code represent-
ing the character keyed.
One or more of the low data
buses take the strobe input

The right design — for all the right
reasons. In setting forth design pa-
rameters for ARGOSY, Ten-Tec engi-
neers pursued the goal of giving
amateurs a rig with the right features
at a price that stops the amateur
radio price spiral.

The result is a unique new trans-
ceiver with selectable power
levels (convertible from 10
watts to 100 watts at the flick
of a switch), a rig with the
right bands (80 through 10
meters including the new 30
meter band), a rig with the
right operational features
plus the right options, and
the right price for today's
economy— just $549.
Low power or high power,
ARGOSY has it Now you
can enjoy the sport and
challenge of QRPp
operating, and.
when you need it*
the power to stand
up to the crowds in
QRM and poor
band conditions.
Just flip a switch to
move from true
QRPp power with
the correct bias
voltages to a full
100 watt input.
New analog
readout design.
Fast, easy, reliable,
and efficient. The
modern new
readout on the
ARGOSY is a
mechanical de-
sign that in-
stantly gives you all significant figures
of any frequency. Right down to five
figures (± 2 kHz). The band switch
indicates the first two figures (MHz),
the linear scale with lighted red bar-
pointer indicates the third figure
(hundreds) and the tuning knob skirt
gives you the fourth and fifth figures
(tens and units). Easy. And effi-
cient—so battery operation is easily
achieved.

The right receiver features. Sen-
sitivity of 0.3 ptV for 10 dB S + N/N,
Selectivity: the standard 4-pole
crystal filter has 2.5 kHz bandwidth
and a 2.7:1 shape factor at 6/50 dB.

Other cw and ssb filters are available
as options, see below. l-f frequency
is 9 MHz. if rejection 60 dB, Offset
tuning is ± 3 kHz with a detent zero
position in the center Built-in notch
fitter has a better than 50 dB rejec-
tion notch* tunable from 200 Hz to
3.5 kHz. An optional noise blanker of

Here's a Concept
You Haven't Seen
In Amateur Radio
For A Long Time

New TEN-TEC ftirm©

the i-f type has 50 dB blanking
range. Built-in speaker is powered

by low-distortion audio (less than 2%
THD)

The right transmitter features. Fre-
quency coverage from 80 through
10 meters, including the new 30 me-
ter band, in nine 500 kHz segments
(four segments for 10 meters), with
approximately 40 kHz VFO overrun
on each band edge. Convertible
power; 100 or 10 watts input with
100% duty cycle for up to 20 min-

utes on all bands- 3-f unction meter
shows forward peak power on
transmit. SWR, and received
signal strength. PTT on ssb, full
break-in on cw, PIN diode an-
tenna switch. Built-in cw sidetone
with variable pitch and volume. ALC
control on "high" power only where
needed, with LED indicator.
Automatic normal sideband
selection plus reverse. Nor-
mal 12-14V dc operation
plus ac operation with op-
tional power supply
The right styling, the right
size. Easy-to-use controls,
fast-action push buttons, all
located on raised front
panel sections. New meter
with lighted, easy-to-read
scales. Rigid steel chassis,
molded front panel with
matching aluminum top.
bottom and back.
Stainless steel tilt-
up bail. And it's
only 4" high by
9W wide by 12"
deep (bail not ex-
tended) to go any-
where, fit any-
where at home, in
the field, car, plane
or boat.

The right acces-
sories—all front-
panel switchable.
Model 220 2.4 kHz
8-pole ssb filter $55;
Model 218 1.8 kHz 8
pole ssb filter

y$55: Model
217 500 Hz cw
filter $55;
Model 219 250
Hz cw filter $55; Model 224 Audio
cw filter $34; Model 223 Noise
blanker $34; Model 226 internal Ca-
librator $39: Model 1125 Dc circuit
breaker $15: Model 225 II 7/230 V
ac power supply $129: Model 222
mobile mount, $25; Model 1126 lin-
ear switching kit, $15.

Model 525 ARGOSY

$549.

Make the right choice, ARG03Y-
for the right reasons and low price.
See your TEN-TEC dealer or write.

inn

TEW -TEC. inc

SEV^ERVILIE, TENNESSEE 371*1

73 Magazine • December, 1981 21

low, firing the strobe which
loads the FIFO,

The work of the key-
switch is now complete. In
the original version, the key-
switch provides a direct
ground which retains the
8-bit code on the data buses
and holds the strobe input
low, preventing reset until
the key is released. Con-
versely, there is no direct
ground path in the modified
version. The keyswitch dis-
charges the capacitor, send-
ing a negative-going pulse to
form the 8-bit code and trig-
ger the strobe. When the
negative-going pulse is com-
plete, the data buses and the
strobe input revert to the
static (high) state and are
ready for the next keystroke.
The depressed key is inert
until released; after release,
the capacitor recharges and
the key may be used again
(there is no discernible de-
lay).

Foolproof key debounc-
ing is a bonus feature of this
modification. The keyswitch
panels I used were removed
from old computer termi-
nals that had individual
magnetic reed-switch mod-
ules mounted on rails. Some
of the switches, outwardly
identical to all others but
used for special or dual
functions, caused sporadic
character iterations. I tried
numerous strobe pulse
widths, and even a 555
wired as a one-shot, without
result. A partial cure, effec-
tive for some but not for all
of the aberrant keys, was fi-
nally achieved using capaci-
tor conditioning on the
strobe-input line. These key-
ing anomalies completely
disappeared after the key-
board was modified.

With due respect to
WB9WRE, it's a matter of
opinion whether his— or any
other— keyboard makes CW
music; some would say that
on ly a bug i n the hands of an
expert can do that! Music or
not, this keyboard will play a
better tune after this simple
modification. ■

Photo A. Aluminum angle stock hotted to the sides supports aluminum lopf bottom, and rear
panels. The top was painted with epoxy spray enamel; dear epoxy protects the transfer letter-
ing on the keys and controls. The digital display is for the QRQ, QRS digital speed indicator,
(See article by W7BBX, 73 Magazine, June, 1980, p. 50).

Photo 6. The n-key rollover components are at the top of the diode matrix. Vector T-44 Mini-
wrap posts are used to support the data buses and to terminate keyswitch leads. The key-
board logic, speed meter, and regulator boards are below. All interconnections are made
with single row headers.

22 73 Magazine * December, 1981

Reader Service for tacmg p$ge f 54—

M A P £

H J r.

B U

This terminal has it all
in one compact package at one low price.

THE ROBOT 800 SPECIALTY MODE TERMINAL

If you have been shopping around
for RTTY equipment, you probably
have asked yourself: "How can I get
high performance, multiple-mode
capabilities without spending a
fortune?' Robot Research has
answered this question through the
use of microprocessor technology
The Model 800 is the most complete
specialty mode terminal ever offered
for under $1000; yet it has features
and performance capabilities which
put it in the class of systems costing
twice this amount or more1 All that's
needed to have a complete opera t-
ing system is the addition of a stan-
dard TV monitor

HOW DID WE DO IT?

The most advanced RTTY sys-
tems on the market are designed for
multiple applications As a result,
these systems are burdened with ex-
otic features which are seldom used
on amateur radio These 'features*
add to the cost, complicate opera-
tion, and in some cases even com*
promise performance!

The 800 does not attempt to dou-
ble as a hobby computer or a time-

share terminal. It was designed ex-
pressly for use as a specialty mode
communcations terminal for ama-
teur radio, and nothing else! By
focusing our attention on this simple
concept, we are able to provide a
product which works better, costs
less, and is easier to operate than
those systems which try to do
"everything" and end up doing
nothing very welL

ONE EXAMPLE:

The single most important factor
which affects RTTY receive perfor-
mance is the quality of the demod-
ulator In the 800, we do not allow for
a wide variety of shift frequencies
through the use of tuneable filters.
There are only two shifts which are
used in amateur RTTY, and tuneable
discriminator filters are both expen-
sive and are poor in performance.
The 800 uses separate mark and
space discriminator fitters for each
of these two shifts which are pre*
cisely tuned at our factory. Even
though the center frequency for the
mark filter is the same for both wide
and narrow shifts, the bandwidth is

different and therefore requires sep-
arate filters. By giving careful atten-
tion to these details, we can equal or
exceed the performance found only
in expensive stand-alone terminal
units.

WHAT ABOUT FEATURES?

The Model 800 has all of the ad-
vanced operating features such as
split-screen, word and line editing,
message memories, autostart,
SELCOM, and many others. In addi-
tion, the 800 has a complete set of
operating aids such as an on-screen
Status line, graphic tuning indicator,
and a side-tone oscillator. To get a
complete picture of all of the fea-
tures which the 800 offers, we sug-
gest that you contact us for a full-
color brochure, or visit one of our
dealers for a demonstration.

ROBOT RESEARCH* 7591 Convoy
Court, San Diego, CA 92111 • (114)
279-943Q

WORLD LEADERS IN SLOW SCAN TV, PHONE LINE TV, AND IMAGE PROCESSING SYSTEMS.

WILSON SYSTEMS TOWERS

- FACTORY DIRECT -

to 9

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1174

ST-77B
Features:

Max. Height; 77'
Min. Height: 24 f
Weight; 700 lbs.
Winch: 1500 lbs.
Cable: 6400 lbs.
Requires RB-77B a
will be totally
freestanding

Recommended
Rotor: High Gain
Roto-Brake

FACTORV DIRECT

roD

674

FACTORY DIRECT

409

T T

16'

6" O.D,

MT-61 B
Features:

Max. Height;, 61 r

Min. Height; 23'
W Weight: 450 lbs.

Winch: 1200 |bs.

Cable: 4200 lbs.

No Guys required
when mounting
against house.

For completely
freestanding in-
stallation, use
RB-61 B or
FB-61 B below \

■3.5 O.D.

16'

* 5" 0 0

6" CD.

fe- I I

TM5B
Features:

Max Height: 45'
Min. Height: 22'
Weight: 250 lbs.
Winch: 1200 lbs.
Cable: 4200 lbs.

No Guvs required
when mounting
against eve of
house.

For completely
freestanding
installation, use
RB45B or FB-45B
below.

Z'Q.D

IS'

y&'o.D.

4 5 O.D

SO'

20'

WIND LOADING
Tower Height Sq. Ft.

ST77B

l:<

Square

Footage

Based on

50 MPH

Wind

MT61B

TT^5B

&5S

(

BASE CHART

TOWER

WIDTH

DEPTH

TT^SB

12**12"

30"

FB-45B

30" x 30"

4tt '

RB4BB

30**30*

4ft '

MT*1B

18* a 18*

FB-61 B

3f *3'

5Vr'

RB-61B

3' x 3f

Mf»

ST-77B

See Below

Bases

B9-77B

3tt ' x 3£ '

Wilson Systems uses a high strength carbon steel tube manufactured especially for Wilson Systems. It is
25% stronger than conventional pipe. The tubing size used is 2" & 3Vi" 095; 41/?" & 6" ., 8" -J 34.
All tubing h cold dip galvanized. Top section is 2" OD, for proper rotor and antenna mounting.

The TT-4SB and MT GIB come complete with house bracket and hinged base plate for against-house
mounting. For totally freestanding installation, use either of the till-over bases shown below.

The ST-778 cannot be mounted against the house and must be used with the rotating tilt-over base
RB-77B shown below.

TILT -OVER BASES FOR TOWERS

FIXED BASE

The FB Series was designed to
provide an economical method of
moving the tower away from the
house. It will support the rower m
a completely free-standing vertical
position, while also having the
capabilities of tilting the tower
over to provide an easy access to
the antenna. The rotor mounts at
the top of the tower in the con-
ventional manner, and will not ro-
tate the complete tower.

FB-45B.. 112lbs...!20995
FB-61 B.. 169 lbs. . . s29995

ORDER
FACTORY DIRECT
1-800-634-6898

ROTATING BASE

The RB Series was designed for
the Amateur who wants the add
ed convenience of being able to
work on the rotor from the
ground position. This series of
bases will give that ease plus ro-
tate the complete tower and an-
tenna system by the use of a
heavy doty rhrust beanng at the
base of the lower mounting posi-
tion, while still being able to. tilt
the tower over when desiring to
make changes on the antenna
system.

RB-45B.. 144 lbs... 289*
RB-61 B . . 229 lbs. . . s379"
RB-77B. . 306 lbs.. .S5699S

i i

— — — -m^^&

'j#i

>*ii

Til tiny the tower over is a
one> man task with the Wil-
son bases, IShown above is
the RB-618. Rotor is not

included,)

Prices Effective 9-1-81 thru 9-3Q-S1

Specifications Subject to Change Without Nonce

w s I

WILSON

SYSTEMS. INC.

428G S Poland A<*p L*\ Vpq^s N^Wddri 89103

WILSON SYSTEMS INC. MULTI-BAND ANTENNAS

- IN STOCK -

A trap loaded antenna that performs like a monobander! That's the characteristic of trmsix
element three band beam Through the use of wide spacing and interlacing of elements, the follow
ing is possible three active elements on 20, three active elements on 15 and four active element!
on 10 meters. No need to run separate coax feed lines for each band, as the bands witching is auto-
matically made via the H*gh*G Wilson traps. Designed to handle the maximum legal power, the
traps are capped at each end to provide a weather-proof seal ayamst ram and dust The special
hhgh-Q traps arc the strongest available in the industry today.
_ SPECll-JCAtlONS

dSd)

: SWH & • FMjr>i»MCi?

^.b Rji«o

14 2t 7B
Lr Ml

Ui- to 9dB
1 3 1
b0 oimi
20uy w l*Mtw

Ha ui fc«-menli

lit , "LlillU*

M^» i nj fit mMl dnwneier
Sutljci di

* 24 .

2"
6

2B 2'.

3 6 wi It

Feed rrw inod j»m1I B

»1 Mi

jHr JdpproM I

ADD 40 OR 30 METERS TO YOUR
TRI-BAND WITH THE NEW 33-6 MK

L^+ - IN STOCK -

Now you can have the capabilities of 40-meter or 30 meter operation on the System
36 and System 33* Using the same type high quality traps, the new addition will
offer 200 HKZ of bandwidth at less than 2:1 SWR. The new 33-6 MK will fit your
present SY36 or 3Y33, and using the same single feed line.

SYSTEM 33

- IN STOCK -

Capable of handling the Leyal Limit, the "SYSTEM 33" *s trie finest compact in bander avail-
able to the amateur. Designed and produced by one of the world's largest antenna mariufdtiuiers,
the traditional M^al'iV °* workmanship and materials excells with the "SYSTEM 33" New boom -
to-element mount consists of two 1/8" truck formed aluminum plates that will provide more
clampiny and holding strength to prevent element misalignment Superior clamping power is ob
td<ned watt the use of a rugyed 1/4" thick aluminum plate for boom to mast mounting The use of
large diameter High Q traps in the "SYSTEM 33" makes it a high performing tn -bander and at a
werv economical price, A complete step-by step illustrated instruction manual guides you to easy
bly and the lightweight antenna makes installation of the "SYSTfcM 33" quick and simple

^— SPECIFICATIONS -

14 2\ 2H

bt) ahn

20 UB ui u-tiw

Bown lOU * irrtgiM
Ha of demenn

Turning fiitiiUi

WILSON

SYSTEMS. INC.

2" * 14'4"
2

27 4
15 9
2 O O
5 7 id tT

a U-M<|iri9 it SO . t 14 IIS

Assembled **c>gfr\ Umi - J / ibi

j^l lJi3t)Tu»| 42 tin

ORDER
FACTORY DIRECT
1-800-634-6898

WV-1A

4 BAND
TRAPVbRriCAL
(10 40 METERS)

No band switching
necessary with this
vertical An excellent
low cost DX antenna
with an electrical quarter
wavelength on each band
and low angle radiation,
Advanced design
provides low SWR and
exceptionally flat
response across the full
width of each band

Featured is the Wilson

large diameter High-Q
traps which will maintain
resonant points with
varying temperatures and
humidity

Easily assembled, the
WV-1 A is supplied with
a hot dipped galvanized
base mount bracket
to attach to vent pipe or
to a mast dnven in the
ground,

Note:

RadiaJs are required for

peak operatton.

(See GR-1 below!

SPECIFICATIONS

* 19' total height

* Self supporting — no guys
required

* Weight — 14 lbs

* Input impedance: 50 Si

■ Powerhandling capability ■
Legal Limit

* Two High-Q traps with large
diameter coils

* Low angle radiation

* Omnidirectional
performance

* Taper swaged aluminum
tubing

* Automatic bandswitching

* Mast bracket furnished

* SWR: 1,1:1 or less on all
bands

GR 1

The GR-1 is ihe complete
ground radial kit for the WV
1A, It consists of. 150' of 7/14
stranded aluminum wire and
heavy duty egg insulators, in-
structions. The GR-1 wiJl in*
crease the efficiency of the
GR 1 by providing the correct
counterpoise.

PauiGrupp KA1LR
73 Magazine Staff

The Kenwood
TR-7730 Transceiver

let's get small!

Time was, if you had a
srnal I tar and wanted to
put a synthesized two-
meter rig in it, you either
cultivated a sadistic
disregard for your passen-
ger's knees or got yourself
one of the two rigs on the
market with a compact
separate control head. The
new Kenwood TR-7730 is
part of a trend that will
change all that. Measuring
a mere 2" high, 5.75" wide,
and 775" deep, it will fit in
the smallest of cars without
usurping precious legroom

and is even compact enough
to fit in the extra radio slot
located in the console of
many newer cars. One might
suppose that a great deal
was sacrificed to cram ev-
erything into such a small
package. Surprisingly, this is
not the case. Without fur-
ther ado, lets take a tour of
what the TR-7730 has to
offer.

The Features

Starting in the upper left-
hand corner of the front
panel, we find the memory

channel selector and two
square push-buttons — one
marked "M" and the other
marked "MR", The "M" but-
ton loads the frequency
shown on the digital display
into one of the five memo-
ries. This frequency can
later be recalled by pressing
the "MR" button and choos-
ing the desired position on
the rotary selector. On
memories 1-4, the transmit-
ter offset is set with the
switch on the far right-hand
side of the front panel.
Memory 5 programs both

The Kenwood TR-7730.

26 73 Magazine * DecembGf, 1981

transmit and receive fre-
quencies, allowing access to
repeaters using non-stan-
dard splits.

Beneath the memory
controls are the combina-
tion power switch and vol-
ume control and the
squelch. Directly to the
right of these is the main
tuning knob, which steps
through the band in a simi-
lar manner to the knob on
the TR-9000.

Just to the right of the
main tuning knob is a
switch which selects either
5- or1Q-kHz steps with each
click of the main tuning
knob, a high/low power se-
lector, and an on/off switch
for a user-installed CTCSS
encoder. Directly above
these are three switches as-
sociated with the scanning
circuitry. Pressing the
"Scan" switch starts the
7730 scanning up the band.
It will stop on any signal
that breaks the squelch and
resume scanning when the
signal drops If you hold
down the scan button con-
tinuously, the rig scans at
twice the normal rate. If
you wish to remain on a fre-
quency, press the PTT
switch on the mike or the
"Hold" button on the front
panel. Pressing the "MS"
switch scans the five fre-
quencies programmed into

Top view of the Kenwood TR-7730.

Bottom view of the Kenwood TR-773Q.

the memories, The scan and
hold switches work in both
the band- and memory-
scanning modes. The
up/down switches on the
microphone function only
in the band-scanning mode.

All displays are of the
LED variety There is a bar-
graph S/rf -meter similiar to
that on the TR-7800, al-
though the display on the
TR-7730 seems to be less
prone to flickering. Above
this are three LEDs, The one
on the far right lights to in-
dicate that a repeater off-
set has been selected, the
middle when the unit is
transmitting, and the left
when a signal that breaks
the squelch is present. To
the left of this is the main
frequency display.

Most of the rear panel is
dedicated to a heat sink for
the final amplifier. In a clus-
ter on the left side are the
antenna connector, power
cable, speaker jack, and a
three^prong jack for a mem-
ory backup power supply.

Big Rig Performance

Kenwood wisely avoided
compromise in the rf stages
in their down-sized rig. The
transmitter and receiver
stages are strikingly similar
to those in the TR-7600,
Space was saved by shrink-
ing the control circuitry, re-
placing some discrete com-
ponents in the audio chain
with JCs, and simplifying
the final stage. Specifica-
tions are virtually identical

for the two rigs. Sensitivity
is rated at better than .5 uV
for 30 dB S/N. Selectivity is
spec'd at 12 kHz at 6 dB
down and 25 kHz at the
— 60-dB point In the high-
power mode, our unit ex-
ceeded its rated 25 Watts at
all frequencies between
144 and 148 MHz Output
in the low-power position is
continuously adjustable,
making it easy to match the
rig to amplifiers requiring
only 10 Watts or so of drive
As with most commercial
rigs, the deviation level was
set slightly high for the
close-talking most hams
use to improve signal to
noise in a car, but was easi-
ly readjusted.

In actual use, the
TR-7730 is a champ. It
worked perfectly the mo-
ment it came out of the
box. Both transmit and re
ceive audio have the usual
Kenwood characteris-
tics— high fidelity with no
sacrifice of intelligibility.
The squelch is extremely
sensitive and seems to latch
up resolutely, without the
mushtness encountered on
many rigs. The controls are
thoughtfully shaped and lo-
cated—most of us should
have no trouble putting the
TR-7730 through its paces
in a dark moving vehicle.
The bar-graph S-meter,
which first struck me as be-
ing a gimmick of question-
able utility, turned out to
be extremely useful It's a
lot easier to read at a

glance than a D'Arsonval
movement.

The only thing more en-
joyable than using this rig is
deciding where to install it!
It's so small that the possi-
bilities are almost endless.
After considerable debate,
I removed the AM radio
from my Dodge Colt's dash
board and cut away the
plastic faceplate with a
fine-toothed saw and a cou-
ple of files. I didn't know
whether or not the rig
would actually fit until the
faceplate was completely
cutaway. Behind the dash I
found two metal braces, of-
fering plenty of support.
The fit is so tight that I
didn't have to screw the rig
down. I connected the re-
mote speaker jack to the in-
dash speakers supplied with
the car.

Not for the squeamish,
an in-dash or console instal-
lation can nevertheless be
extremely satisfying, I used
to enjoy having my car look
like a mobile NASA control
center, with rigs hanging
everywhere, but I get even
more pleasure from the
clean setup I now have. If
you decide to try an m-dash
installation, just be sure
that there is plenty of air
circulation available. Inad-
equate cooling can kill
a rig.

I used the Kenwood
MC-46 DTMF mike, and I
must admit I have a love/
hate relationship with it. On
the plus side, it has all 16

tones, which is useful, and
the audio quality of the
condensor mike element is
unquestionably superior to
the mike packed with the
rig. On the negative side of
the ledger, the mike is
small! It took me a couple
of days to learn how to han-
dles it without inadvertent-
ly pushing one of the but-
tons on the pad The hang-
up hook resembles those on
other microphones I own,
but it is slightly smaller, so
it won't stay put in either of
the mike holders in my car,
The small size no longer
bothers me, but I am still
looking for something to
hang the mike on when I am
not using it. My advice is to
check out the mike careful-
ly before buying, and if it
seems too small to cope
with, pick up a Kenwood
MC-45 You'll need to re-
wire the mike connector,
but the 45 is a solid, full-
sized microphone, sure to
please the most ham-hand-
ed ham! The MC-46 has
some nice features, though,
and is probably well worth
the effort required to get
used to it

Nothing is perfect, of
course, and the TR-7730 is
no exception. I found three
relatively minor things I
would like to see improved.
First, the main frequency
display is anything but easy
to read. No doubt the loca-
tion I chose for the rig

Continued on page 196

73 Magazine • December, 1981 27

HUSTLER

HF MOBILES
DELIVER
FIXED STATION
PERFORMANCE

Hustler HF antennos delivi
outstanding signal reports
Wherever you're mobile?

Design your own HF mobile
from a full selection of top-
quality. US made stainless
stee* ball mounts, quick dis
connects, masfc. springs, ond
resonators, You ran cover anv
6-tr>80- meter bond Cboose
from medium of Ngh power
resonators with broadest
bandwidth and lowest &rW for
optimum performance on any
band Easy band change and
garaging with Hustlers fcrtd-
cver most. too.

Ask any ham — the best HF

mobiles on the road come
from: Hustler- still the
standard of performance

,^an -{

£J?

3275 North B" Avenue
Kissimmee, Florida 32741

a.h Jran/vnnn

ClKfl*|

GOT A

BATTERY

EATER??

YOU NEED A
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BEAT YOUR BATTERIES!

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PORTA-PEATER
INSTANT REPEATER

Command and control module makes an instant re-
pealer from any ? radios with absolutely no modifi-
cations to the mrtios interfaces via the eKlernal spenker
and imc jack? Perfect tor a personal emergency. 01
lined repealer Write or call lo* dctHileri data manual Wp
accept VISA and M/C Reoueat catalog

• 4 Individual CW-lta(1K PROMJ

• VOX— COR COR triggers

• AdJ CMS mln ID cycle rimer

• Ad] 0-15 mm. Time Out timer

• Aoj 0-30 sec hang timer

• Adj 2Mb local true amp

• True repealer beacon, or manual modes

• 350 volt switching capability

• Complete gainiiniertacp controls

• Complete technical manual
#PCfl si*e5l« r5'V

• 3? pm edgecard interface

$99.

Assembled*
Tested,
00 Burned In,

Programmed
(Inc. S3, postage)

.^30?

W-S ENGINEERING

P.O. BOX 58

PINE HILL, N.J. 08021

24 HR. PHONE: 201-852-0269

look here

call toll free:nights

(800) 231 -3057

6-10 PM CDST, M.W.F.
days: 713-658-0268

ICOM

Santec
ETO

Telrex
Drake

AEA
YEASl

IC720A/AC .... $1298

IC 2AT 249

IC 22U .., 269

HT 1 200 299

ST7 440 FM 299

Alpha 78 2595

76PA 1795

I ^y ^^ ^ i»i i # « 4 i t i f t v * ^ -^

TR7/DR7 1349

R7/0R7 1299

Morse CK1 .-.„ 115.00

FT707 „,„. 699

FRG7700 449

FT101ZD

Mark 3 Umited ... 749

Order KWM 380 Now

OLD PRICE

Rockwell Accessories in Stock

O 0 I I tl 1 VJ W ^\ 3 ■■■■■.■■■plt|M|IM>1tll<4il*r.r,,H \ . kJ %J

Bash Books 9.95

Amphenof Silver Plate PL-259 1 00
Antique/Rare Tubes Call

Timex24bourWallclock 24.95

Robot 800A 749

Cubic 103 1195

Bird 43 SLUGS

Portable VJ Amplifier

2 watts m 33 watts out .... 89 95

Befden 9405 Heavy Duty

Rotor Cable 2/M6, 6#18 .. 45C/fi
Belden 8214 RG-8 Foam 36C/ft
Belden 9258 RG-8X

Mini-coax , , , 1 9C/ft

Alliance HD73 Rotor 1 09 95

Call for TS830S, TS130S.
TS-530S plus accessories

MASTERCARD VISA
Air p'icps fob Houston except where indicated Prices
s« ibjecr id cngnge without nonce, alt items guaranteed
Sonme nems subject prjdf Texas residents odd 6%

taj Please add sufficient ± qe. balance colled

Electronics Supply

1508 McKinney "*b
Houston, Texas 77010

28 73 Magazine • December. 1981

Wl BACK EVERYTHING
WE SELL WITH OUR
PERSONAL CL ARANTEE

PRICES F O B
HOUSTON

PRICES SUBJECT TO

CHANGE VMTHOL1
NOTICE

ITEMS SUBJECT TO
PRIOR SALE

NEW NIGHT L1NF
TOLL FREE

1-800- 23 MO 57
MON, WED, FRI, 6 PM-10 PM CT

NEW

fKENWOOD

2m FM HANDIE

IC-720A

$1298.00

ICOMs top of the fine - 9 band
HF transceiver, genera!
coverage receiver - 0,1 MHz to
30MHzh 12 VDC operation
(compatible with PS15 power
supply) 2 VFO's built in,

• programmable
start

• lithium memory
back-up

• power output 2.5
watts ot 300 mw

• "Slide LocM
battery park

• tuneable sub-
tone encoder

CALL FOR QUOTE

DONS CORNER

Our service men note the new rigs coming out, and they are
plentiful. Seem to be almosl failure proof the first leap out of
the factory. The design is better. Quality-control seems to
preclude the old warning JJwait until a few get out" before
purchasing; plus, the dealers seem to be getting better service
info feedback from the factory, faster than ever.

Word of Advice: Buy from a dealer that is AUTHORIZED or

can guarantee you local service. Don't get stuck with a unit that

must be factory repaired' unless that factory so stipulates.

This month's best buy - Alpha Amps at cheaper than ever

prices.

Try our Service Department — you'll like it! Five People;

One Tech for KWM38Q's only; one for digital equipment; one

for tube sets: one for older Collins/Drake; one for general

repair - odds and ends that you don't want to do. CALL US!

Least we can do is tell you whether to put it on the shelf or send

it to us,

See you next month!

P.S. Tu rns out Tang (our spy in Japan) was snortin' Saki when
he reported on the Kenwood TS-840, 1 (flat doesn't exist, never
has, never will I put him on probation.

KWM 380

LJST $3495 + filter

Your Cost $3095

fncl. filter

)

Ffl ICOM

IC2 AT
269.95

49.95

BC-30-

69.95

CALL

FOR

QUOTE

NEW!!
YAESU FT ONE

LIST
$2995.00

three selectivity
positions for CW (two
for F5K!) using optiona
filters

73 MHz first IF
0.3 uV sensitivity
full break in

CALL FOR
QUOTE

Curtis 8044 keyer
available as option
front panel keyboard
ten VFO's

one year factory
warranty

UEMJ

$910.00
CALL FOR QUOTE

i* A

NEW
IC3AT

220 mHz

Call for

Specs &

Quote

$299,00
W/Pad

$269.00
W/O Pad

CALL FOR QUOTE

RGft u
Obi 5M*Jd

p*rt

^ 98UB
65C/ft

Foam 81 Vf

RGB U

8214
38 C/ft

3237
32 C/ft

RQ213

Nqti -con I ami n»tm$

*- 8267

43 C ft

HI I
I IK"
7M>

it)

Htfl

/^n

t.Mi
+ 1111

Till

,'IM.
Wl'

All..

Ifffl

•tt:

i <

I 41

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t *>

f i

Lfl

4 '

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db
t «

i)
'nil
"3 *

I *

'. -I

M
l-l ft

I J ■■

H I,

* H

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' £ * A44*

- *- * 27 C/ft

r*> i?i ■ <mu

AWi'i nri mini

t. 22 • K\

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^03

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9405
45C/ft

*Hi :j1 i.,vk1 6
AtMi m\ rruni -
? 16 (26 '301
6- lfl flfi - 30h <* 1/1

Belden Mini RG-8 (9258)-19«/ft

FT 101ZD

$369.00

CALL FOR

QUOTE

FT708R

FT 208R

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FOR

DETAILS

713-658-0268

* CALL FOR QUOTES

1508 McKINNEY
HOUSTON. TEXAS 77Q10

)

END OF YEAR SPECIAL

Fll/E MND
1RAP DIPOLE

BARKER & WILLIAMSON
MODEL 370-11

Five Amateur Bands

(80 thru 10 Meters)

With One Antenna

Pre-assembled - Complete with wire * Traps * End
insulators ■ 50 ft- RG-8/U coax with PL-259 connector
Five bands 80, 40, 20, 15 and 10 meter operation
with one antenna • Only two adjustments required *
Only 110 feet long • Heavy duty cast aluminum and
steatite center connector

Price OTGr$69£Q

B'W

Barker & Williamson Inc.

10 Canal St
Bristol. Pa. 19007
215-788-5581

Maitr'Card

VISA

1 1

Now $43.00

Limited Supply

4SQTR0N ANTENNAS

THE BEST THINGS
come in little packages...

NEEDS NO RADIALS OR
MATCHING DEVICES

I SOT RON SO
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ISOTRON 40

31 IN. HfGH

ISOTRON 20
17 IN. HIGH

fe^3

ON PERFORMANCE
SMALL ON SPACE -°

BILAL COMPANY

STAR ROUTE

(303)687-3219

FLORISSANT CO 80816

^461

PHASE II

TWIN ANTENNA

sS$

• SUPER BQ-POUNO. 100 -MPH GRAY MAG-
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• 5/8 WAVE FOR PHASE II SIGNAL

' AND *

• 1/4 WAVE FOR CLOSE-IN AND RE-
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• INSTANT CHANGE-OVER

• SUPERIOR PERFORMANCE

• STAINLESS STEEL SPRING AND WHIP

• CHROME Oti BftASS BASE* COMPARE!

• BOTH ANTENNAS ARE FREOUfNCY
ADJUSTABLE

• COMPLETE WITH 17 FEET OF FOAM
COAX AN0 PL-259 CONNECTOR

• MADE IN LLS.A

INTRODUCTORY PRICE:

$29.95

COMPARE!!
TWO ANTENNAS FOR THE PRICE OFONE!

AMATEUR-WHOLESALE ELECTRONICS

8817 S.W. 129 tH Thrace. Miami Florida 33176

Telephone (305) 231-3631 ■ Telex: 80-335B

HOURS: 9 - 5 Monday thru Friday

• US DISTRIBUTOR. DEALER INQUIRIES INVITED

master charge

ORDER NOW TOLL FREE

800-327-31 02

•

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1 ft

AJttW

■

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tr 4 B

•55^

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1 ***

Efe

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[^ H ****" 1 "' M I yf

B* S& tf*

_^.^,-^ ^^., ^ -"T^ '{

J. -If tftt *cw *«^_

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FALL SALE

METER

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INSTANT MEMORY 1 RECALL: By pressing a button on the microphone or
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PROGRAMMABLE BAND SCAN; Any section of the band may be scanned in
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input frequency COMPARE!

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Joe Ham: The Consumer

do you fit the mold?

In spinning the dial across
the various amateur
bands, it is not unusual to
find a QSO concerning ra-
dio equipment. A typical
QSO might be as follows:

I am running a Satellite
TS6 with a Pacific Kilowatt
2 linear amplifier. My an-
tenna consists of stacked
verticals, 33 elements, up

Purchased

1 year (or less)

2 years

3 years

4 years

5 years (or more)

about 1 00 feet. I also have a
Demosthenes speech pro-
cessor

It appears that there is
much interest in the types
of radios and accessories
being used as well as the
reason for purchasing spe-
cific radio products. Al-
though there have been
many formal studies con-
cerning consumer behavior,

Number of Amateurs (%)

23
20
14
10
33

Total

100

Table t, HF SSB radios — when purchased.

the radio amateur as a con-
sumer has been neglected.
The purpose of this arti-
cle is to present some ex-
ploratory research findings
on the influence of con-
sumer behavior on the buy-
ing habits of radio ama-
teurs.

Methodology

The data in this study
were gathered from ques-
tionnaires sent to 300 radio
amateurs in each of the ten
United States call areas.
The amateurs were selected
by random sample from the
7980 Radio Amateur Call-
hook, The sample included
amateurs from each of the

fifty states, divided into
three license class classifi-
cation s — C e n e r a I , Ad-
vanced, and Extra. Two am-
ateurs were taken from
each class for each state.
The study was primarily
limited to HF SSB radio
equipment.

The HF SSB Radio

An important part of the
study dealt with the types
of HF SSB radios owned by
the radio amateur, age of
radio, where purchased,
and purchasing influences.
The following is a list of HF
SSB radios, including manu-
facturer and model num-
ber, that were most fre-

Source of Purchase

Local Franchisee* Dealer
Mail-order
Another amateur
Other (includes factory,
swap meet, hamfest)

Reasons for Purchase

Number

of Amateurs {%)

N umber of Am at eurs (%)

Reputation of dealer (including

service)

Price

Store personnel

Other (includes availability,
location of dealer, etc.

Total

100

Total

100

Table 2. Where radios were purchased.
32 73 Magazine • December, 1981

Table 3. Reasons for purchasing radio from dealer, etc.

J im

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to access Amateur repeaters or just as a piece of ver-
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162.2 5B

203.5 M1

74.4 WA 91.5 ZZ

110.9 2Z

136.5 4Z

167.96Z

77.0 XB 94,8 Z A

11 4.8 2 A

141.3 4A

173.8 6 A

79.7 SP 97.4 ZB

118.8 2B

146.2 4B

179-96B

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123.0 3Z

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Reasons for Purchase

Reputation of Manufacturer

(including quality)
Features of the radio
Convenience in operation
Other (includes American-made,

prestige, size, performance)

Number of Amateurs {%)

Purchasing influences

Advertisements

Friend (Amateur)

QSO

Store display

Other (includes store salesman,

family, used in contest)

Number of Amateurs (%}

42
31
15
10
2

Total

100

Total

100

Table 4* Reasons for purchasing a particular brand of radio.

Table 5. Other purchasing influences.

quently mentioned in the
survey*: Collins KWM2;
Drake TR4C, TRF; Heathkit
HW-101; Icom 701; Ken-
wood 120S, 5205, 820S;
Swan Astro 150, 102BX;
Ten-Tec Triton IV, Omni
A/D; Yaesu FT-101,101E

It is interesting to note
that only 25% of the ama-
teurs surveyed had solid-
state radios. The reason for
this is probably because of
the age of the sets. Table 1
indicates that although
33% of the amateurs have
had their sets for 5 years or
more, 23% have purchased
new radios within the past
year.

Why A Specific
Radio Was Purchased

The buying environment
is an important part of con-
sumer behavior. Not only
where a purchase was
made, but why it was made
are basic factors to consid-
er.

As shown in Table 2,
most of the amateurs
bought their radios from ei-
ther a local franchised deal-
er or by mail-order. The rea-
sons for this are illustrated
by Table 3. It can be ob-
served that the reputation
of the dealer, including ser-
vice, and price are consid-
ered to be the prime rea-
sons for buying a set from a
particular place.

As discussed previously,
the reasons why an amateur
purchases a particular radio
are important factors to
consider in consumer be-

*lt is not the purpose of this arti-
cle to rate any one manufactur-
er's product over another. Also,
not all sets mentioned in the
study are listed; only those ra-
dios that were most frequently
mentioned are given here.

34 73 Magazine • December.

Types of Antennas

Triband yagi beam
(3 elements or more)

Dipole
Vertical

Quad

Monoband yagi
Minibeam
Long wire

Number of Amateurs (%)

Reasons for Purchase

Efficiency and gain.

Work ail bands.

Best value for money.

Low noise.

Fits limited space,

Low profile.

Good construction.

Better DX.

2
1

Total

100

Table 6. Antenna systems and reasons for purchase.

havior. Table 4 indicates
that the reputation of the
manufacturer, quality, and
features of the radio are im-
portant elements consid-
ered by the amateur when
purchasing an HF SSB radio.

Additional factors that
influence an amateur's buy-
ing habits are illustrated in
Table 5. It is interesting to
note that 42% of those sur-
veyed felt that advertising
played an important part in
influencing their final pur-
chasing decision. Addition-
al purchasing influences in-
clude friends (31 %), QSOs
(15%1 and store display
[1096 J.

Antennas

There are probably more
on-the-air discussions con-
cerning antenna systems
than any other piece of am-
ateur equipment. The pur-
chase of an antenna, there-
fore, is an important factor
to consider in relation to
amateur buying habits, Ac-
cording to Table 6, the tri-
band yagi beam appears to
be the antenna most pur-
chased by radio amateurs
48% of the amateurs sur-
veyed used this type of an-
tenna, Table 6 also indi-
cates the reasons why a spe*
1981

cific antenna is being used.

Radio Accessories

An important part of am-
ateur purchases includes ra-
dio accessories. The most
popular accessories being
used by the amateur are lin-
ear amplifiers, speech pro-
cessors, audio filters, tun-
ers, and keyers. Other ac-
cessories include monitor
scopes, frequency count-
ers, phone patches, and
computers,

Occupations

Occupation is a basic in-
dex of social behavior. The

Journalist Poet

Architect

Salesman

Computer Programmer

Asst V.P, Operations (Railroad)

Engineer

Lawyer

Real Estate Broker

Florist

Electronics

Post Office Department

US Navy

City Government (Administrator)

Business Executive

Teacher (1st Grade)

Accountant

Dentist

Retail Bicycle Store Manager

Social Worker

Research (Medical)

results of the study show
that people from all walks
of life are presently enjoy-
ing the hobby of amateur
radio. The occupations of
radio amateurs as given in
the survey include those
shown in Table 7.

Conclusion

As previously discussed,
this survey should be con-
sidered merely as explor-
atory in nature. The study
was limited by the size of
the sample obtained- This,
however, is only a begin-
ning in looking at the radio
amateur as a consumer.B

Veterinarian
US Army (Captain)
Astronomer
Auto Mechanic

Photographer

US Air Force

Housewife

Plant Manager

Telephone Installer

TV Broadcast Engineer

Marketing Product Manager

US Coast Guard

Musician

University Professor

Glass Blower

College Baseball Coach

Clergyman

Farmer

Retired

Table 7, Occupations of hams,

Radio Activity

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73 Magazine * December, 1981 35

Wilson Microwave Systems

= 3

> -

Wilson Microwave Systems uses the latest state of the art
method of manufacturing the parabolic designed antenna.
Resistance to distortion and instability is increased with
the addition of a full screen mesh sealed within the %"
thick fiberglass.

Wilsons unique "Vari Mount" provides the easiest installa-
tion and mounting method available today. The 4pc
construction of the dish provides easier handling, less
installation time, and greatly reduced shipping costs,

With the exclusive 4 point Williams' mount, you are assured
a quicker installation and that the antenna will be more
securely fastened to the Vari-Mount. The antenna struts
aid in stabilizing the fiberglass for operational reception in
winds of up to 50 60 MPH.

A ball bearing race allows easy turning of the antenna in
changing to the different satellites. A scale is included on
the base to assist in their location.

For those areas that require a larger dish than the 3.35
meter, Wilson offers an addition that will increase the size
to 4.0 meter. It is easily bolted to the outer edge and main-
tains the strength, while increasing the performance.

The optional remote control feature allows you to control movement of the azimuth and elevation positions of the
antenna from the comfort of your easy chair — without having to go outside. This feature may be added later.

Wilson can now supply you with a complete system for turnkey operation that includes everything that is required
for installation. The package includes the fiberglass 1V antenna featured above, receiver, 120° LNA, modulator,
and all cables required. Many options are available.

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73 Magazine • December, 1981 37

Bob Cooper:
Profile of a Pioneer

Editor's Note: In just thro© decades, television has won the hearts and minds of American society. Newsweek Magazine reports that the
"average family member spends more than seven hours a day tethered to the tube/" Innovations like community antennas, cable TV, and
now reception directly from the satellites have nurtured our passion for video. Perhaps you prefer an evening of rag-chewing on 75 meters or
chasing DX on the low end of 20 to watching the one-eyed monster— even so, you can't deny the impact that television has had on
everyone's lives.

Tim Dantet N8RK
73 Magazine SlafV

SM fix meters is open. My lit-
tle portable SSB rig is
hooked to a jury-rigged
VHF TV antenna and I'm
copying stations as far
away as Florida As I tune
across the band, I find a
pileup that rivals anything
you hear on 20 meters.
Eventually the furor dies
down and I hear a weak but
copyable signal:

"This is VP5D; the name
is Bob and my location is
Providenciales, one of the
Turks and Caicos Islands/'

The voice goes on to say
that this is not a DXpedi-
tion, but rather a perma-
nent station, so if you don't
work it today, there will al-
ways be another chance,

VP5D is Bob Cooper, also
known as W5KHT. When
Bob is not handing out re-
ports on six or ten meters,

he is likely to be pursuing
another form of electronic
magic. Bob, you see,
dreams about making higfrv
quality, universally-avail-
able television a reality-
Cooper is the father of
home satellite television. In
just five short years. Bob
ushered home reception of
satellite TV from being a
five-figure investment to
the point where you can as-
semble a complete system
for about $2000. Along the
way, he wrote dozens of ar-
ticles, including one for 73,
he had a column in QSTt
and he received coverage in
publications like Mother
Earth News and TV Cuide.
Coop's fame extends be-
yond the written word;
he has appeared on Japa-
nese TV news and more fa-
miliar programs like "PM
Magazine/'

To trace Bob Cooper's at-
tachment to video, we have

Bob VP5D,
36 73 Magazine • December, 1981

to go back to the infancy of
commercial television. The
Cooper family lived just far
enough away from the near-
est station to make recep-
tion a difficult task As a
youth Coop combined his
ham-radio-based knowl-
edge of electronics with an
enthusiasm for the growing
world of TV. After all, build
ing beams and preamps for
VHF TV was not too dif-
ferent than home-brewing
gear for six meters.

Bob's college training in
broadcast journalism even-
tually led him to the cable
TV industry where he was
involved with the publica-
tion of trade magazines.
When the satellite TV era
began, Bob was already the
veteran of the original TV
explosion and the develop-
ment of cable TV

Coop's first exposure to
satellite TV came at a cable
TV trade show in 1975.
Soon after, he began to
work putting together a sys-
tem of his own. By scroung-
ing in the true ham radio
fashion, he was able to
build one of the first home
satellite TV receiving sys-
tems for far less than the
$25,000 asking price.

Along the way. Bob met
other pioneers like Stanford
University professor Tay
Howard W6HD and Bob
Coleman K4AWB who were
working towards the same
goal. Since new equipment
was so expensive, these trail-
blazers relied on surplus

units or, failing that, they
home-brewed. There were
no plans to follow, no kits
to buy — only imagination
and patience.

What Bob and a handful
of other experimenters
were accomplishing was of
only passing interest to the
professionals in the satellite
TV field. The industry was
content to keep satellite TV
veiled in mystery and ex-
pense. Cooper, realizing the
potential for the mass ap-
peal of home satellite tele*
vision receive only (TVRO),
decided to go public. He
did it in a big way. The TV
Guide article in October,
1978, and subsequent cov-
erage on the CBS Evening
News alerted millions of
people about the new
technology.

Overnight, Coop was be-
sieged with thousands of in-
quiries. He had created a
demand which he is still
striving to meet three years
later. In those early days,
there was no gear aimed at
the home market. Before
long, garage industries,
often started by hams,
sprang up It was (and still
is) a seller's market and any-
one with a background in
electronics had a tremen-
dous advantage.

A digest for satellite TV
enthusiasts, publishing
manuals, and sponsoring
seminars turned into a full-
time endeavor and Bob
made the plunge, commit-
ting all his talents to the

Bob utilizes his extensive knowledge of the broadcast and
cable TV industries to make high-quality TV a reality, de-
spite the remote location. To Bobs left is a vertical interval
switching unit which allows him to change signal sources
rapidly, without any gl itching. The monitor displays a
computer-generated timer weather, and community infor-
mation report. This is just one of the several ways that West
Indies Video offers a local flavor to its programming.

young industry.

The early days were not
all milk and honey. The first
Satellite Private Terminal
Seminar (5PTS) in Oklaho-
ma City was almost can-
celled. A last-minute court
hearing decided that the
freedom to share informa-
tion superceded a cable TV
supplier's desire to keep the
subject a mystery. (The le-
gal questions that surround
the satellite TV explosion
are just beginning to see a
thorough airing.)

Cooper was in on the
growth of the industry from
the start. Coop's Satellite
Digest has become the fa-
vorite source for update in-
formation about the tech-
nology and the satellites
themselves, How-to manu-
als, priced from $30.00, sell
briskly. The thrice annual
SPTS events are attracting
over a thousand partici-
pants who gladly pay the
$150 admission price. Coop
had started the wave rolling
back in 1978 and he man-
aged to climb on top for a
very successful ride. He let
others manufacture the
equipment, sell the dishes,
and install them. His bag is
information, something
that a young industry can't
live without

New Beginnings

In 1980, the stage shifted
from Oklahoma to a small,
unknown island in the Carib-
bean. Just as the home sat-
ellite TV industry began to
gain momentum, Coop
pulled up stakes and
moved his family to Provi-
denciales, part of the tiny
nation of Turks and Caicos.
Besides donning a new call-
sign, VP5D, Cooper was on
the brink of yet another
video revolution.

The Coopers fell in love
with the serene, isolated
beauty of the Turks and
Caicos on a vacation visit. It
became harder and harder
to return home on subse-
quent visits, so Bob and his
wife Susan began thinking
about making the island
their new home. The pros-
pering monthly magazine,
manuals, and seminars
gave the Cooper family the
independence to choose a
life in a home alongside a
deserted beach, far from
the hustle-and-bustle black-
topped world that most of
us know Bob was more
than willing to escape the
day-to-day hassles of being
an industry leader so that
he could concentrate on
writing and video work.

The turning point came

The thrice-annual Satellite Private Terminal Seminars (SPTS)
are sponsored by Bob Cooper. They offer an outstanding
way for both hobbyists and dealers to find out the latest in-
formation about this dynamic industry. Approximately
1000 persons gathered at the August 1981, seminar in
Omaha. They had the opportunity to listen to such experts
as Steve Cibson, who has combined the technology of com-
puters and satellite TV for some very exciting results.

when Coop presented the
plans for his new home to
the island officials. Their
curiosity about the satellite
dish (doesn't everyone have
a dish in the backyard?) led
to a proposal that Bob
share his signals with the
rest of Providenciales,
Cooper, who was familiar
with the long, involved TV
broadcasting license proce-
dures in the US, was easily
convinced There were no
existing rules for television
broadcasting in Turks and
Caicos. Being the first to at-
tempt such a project meant
that Bob would be able to
write the book as he went.
The first priority, after
moving to "Provo," was get-
ting West Indies Video off

the ground. A 16-foot dish
was erected to catch pro-
gram material relayed
through SATCOM F1. The
satellite downlink receiver
provides a baseband video
signal that modulates an
"STL" (studio-to-transmit-
ter fink), in this case, a low-
power transmitter on chan-
nel 7. The STL signal is
aimed at a pair of yagis
located on Provo's highest
point, Blue Hill. From this
"mountaintop" location,
the signal is translated to be
broadcast on channel 4
with 8.5 Watts of output
power.

From the project's begin-
ning there was a dual chal-
lenge. Establishing a reli-
able, high-quality TV ser-

73 Magazine ■ December, 1981 39

vice is a major task by itself.
Compounding those head-
aches are the drawbacks
that accompany life on a re-
mote island. Just about ev-
erything you and 1 take for
granted has to be shipped
in, involving a lot of ex-
pense and time. Commer-
cial air service is spotty,
barge traffic infrequent,
and mail delivery takes
three weeks, if you're lucky.

Many families have had
the misfortune to move into
a half-finished home, but
how many have faced the
challenge of setting up
house in a TV station while
the workmen are still ham-
mering and sawing? The
construction of a real home
took a back seat to finishing
the station. The control
room doubled as an office,
while the sound stage
served as a bedroom for the
two Cooper children

The system on Provo
evolved in stages. At first,
the remote transmitter was
powered by automobile
batteries that required
weekly recharging. Later, a
solar-cell array took over,
reducing the visits to once a
month.

Until programmable
switching equipment is in-
stalled, someone must be
present in the control room
every time a change in the
program source is made
When Bob is gone, this task
falls on his twelve-year-old
son, Kevin VP5DX

Except for the fact that
only one channel is avail-
able, Turks and Caicos
viewers are watching tele-
vision like the premium
cable channels available in
the US

Unlike most American
television. West Indies Vid-
eo has no advertising Dur-
ing early stages of opera-
tion, the company is giving
away the service Because
of the large expense of set
ting up the station and the
poor advertising potential,
Coop is planning to scram-
ble the signal and charge a
monthly fee for a decoder,

With 750 subscribers
spread over seven islands,
West Indies Video has
chosen to use an address-
able scrambler. After pay-
ment is received, the de-
coder will be activated for
another month by a hurst of
digital transmissions No
money, no TV.

The islands' version of
the Nielsen ratings is the
phone calls that Bob and
his family receive from dis-
satisfied viewers. Anyone
wanting to invoke the wrath
of an entire nation can do
so by stopping broadcast of
wrestling and boxing on
I riday and Saturday nights.
The most frequently heard
complaint is that programs
are not available 24 hours
a day It seems as though
IV has taken the people
of Turks and Caicos from
being bored and isolated

to being entertained and
informed.

The low-power television
(LPTV) concept which
Cooper has proven in Turks
and Caicos shows great
promise for revolutionizing

TV in the United States. The
FCC is now allowing com-
munities to enjoy special-
ized (educational, regional,
religious, commercial) pro-
gramming broadcast by
TO- to 100- Watt UHF and

This is the site of the Cooper family's dream come true.
Soon after this photo was taken, work began on a second
building that will separate their home from the studio.

40 73 Magazine • December, 1961

August 14r 1981

Dear Satellite Enthusiast

We all have different dreams and aspirations. For the
Cooper family, it had long been our hope that we would one
day be able to move, permanently, to some quiet, outoMhe*
way Caribbean island where our children could be raised to be
sel^sufticent, productive young people and where we could,
as a family unit, make real and useful contributions to the de-
velopment of "our island."

Very few people have ever heard of the Turks and Caicos Is-
lands. A country with around 7,000 total population is not
often in the headlines. Many maps do not show us to be here;
the popular Caribbean tourist guidebooks seldom notice that
we exist. Those that do mention us often make the Incorrect
assumption that the Turks and Caicos are an extension of
and a part of the southeastern Bahamas.

Getting here is very difficult. Mail service fs extremely poor
telephone service is only slightly better. But within 30 days of
our arrival here, the Turks and Caicos had live (satellite-deliv-
ered) television. There was no national sport prior to our ar-
rival; now, due totally to satellite television, professional
wrestling is the national spectator sport. Nobody here had
ever seen or heard world leaders before; they had never seen a
baseball gameT a play, or a movie. They had no idea what Ses-
ame Street was, or where it was. They had never heard of
James Bond or Barbara Walters, They were as far removed
from the 20th century as a people could be.

We take the responsibility of providing high-quality televi-
sion to our country very seriously. We spend as much or more
time making careful program selections as we do working out
the intricate technical parameters of building a high-quality
electronic service.

Satellite television can, in varying forms and shadest do
much the same thing for areas closer to you than the Turks
and Caicos. as \\ has done for our country. The satellite ser-
vice has changed the complexion of the world in just a few
short years, \n the next five years, we will see such dramatic
improvements and expansion of service that our efforts today
will seem very primitive by reflection.

This is the growth field of the 90s and beyond. This is where
the most exciting opportunities of your lifetime are to be
found. The opportunities in this young field are totally unlim-
ited. You can do anything you want to do, if you carefully learn
the basics, carefully plan each step, and carefully select
where and how you will do it.

Welcome to the 21st century. And if you are ever down our
way, stop in and say hello to us on the shores of Grace Bay!
We are the third satellite antenna on the left.

Bob Cooper

Reprinted with permission. Copyright 1981, Satellite Televi-
sion Technology International, Inc.

It takes a big dish to pull in studio-quality signals in the
Turks and Caicos Islands. Boh, on the left, is with W2NSD/1
and WA1KPS.

VHF stations. Satellites will
be the popular, low-cost
way to distribute the video
and audio to the local LPTV
stations. Owning and oper-
ating these stations will not
require the investment that
accompanies one of the full
service stations.

Ham radio operators
have a long history of pio-
neering and popularizing
new methods of communi-

cation Concepts like single
sideband, and now satellite
television, have been trans-
formed from expensive and
complex mediums into
something that is easily un-
derstood and affordable.

For individuals like Bob
Cooper, radio is accompa-
nied by "magic," whether
the challenge is receiving a
4.0-GHz satellite signal or a
pileup on six meters ■

Join SCAN, and join the ever increasing number of
scanner enthusiasts who are getting all the frequency
information they need to really use their scanners? You
get an RQQ quick reference frequency allocations
chart; plus SCANNING TODAY magazine, a forum for
scanning news and technical articles with regular fre-
quency updates from all across the United States.
AlsoH FREE classified ads allow members to exchange
frequency info, 10-codes, as well as sell and exchange
equipment with over 30,000 members nationwide.

Your membership kit includes an 1.D, card, certif-
icate, vehicle decal, and much more. Join today and
get free "Scanners Hear It First" bumper sticker! Send
check or money order for $10.00 to:

Scanner Association of North America
Suite 1212 STP 111 E. Wacker Drive, Chicago, IL 60601

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73 Magazme • December, 1981 41

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42 73 Magazine * December, 1981

v* 16

Header Service for facing page ^457—

WKM 4^

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A REVOLUTION IN CONVENIENCE

DAIWA announces an all-new lineup of high-quality amateur radio innovations.

Cross-Needle Meters
CN-520 / CN-540 / CN-550

DAIWA cross-needUe precision is now avail-
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reflected power and SWR readings at a
single glance— from a meter that fits any-
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CN520 - Frequency: t.8-60MHz * Power range:
Forward 20O2kw. Reflect 4a>400 watts* Detection
Sensitivity: 40 watts minimum * Accuracy: *t0%at
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CN340 - Frequency Range; 50- 150MHz * Power
Range: Forward 20 200 watts. Reflected 4 40 waits*
Detection Sensitivity: 4 watts minimum* Accuracy:
: 10% at lull scale * Dimensions: same as CN-520

CN550 - Frequency Range; 144-250MHZ * Power
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1 10% at lull scale • Dimensions: same as CN-520

Active Audio Filter AF-306

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Automatic Antenna Tuner
CNA-2002

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Amateur Radio Innovations

Satellite Channel Guide

part II

Numbers in parens immediately following programming
description indicate audio subcamefis) used for that par-
ticular service,

TR— 9

TR— 1(1)

TR-3(5)

TR— 5(9)

TR
TR
TR
TR
TR

6(11)
8(15)
9(17)
11(21)

12(23)

WUWESTAR1(99°W)
Polarization: All Horizontal

Occasional Transmissions— porting events,
news, and network feeds (6.2/6.8)
The Transtar Network (est. mid-Oct., 1961)
Occasional Transmissions — sporting events,
news, and network feeds (6,2/6.8)
PET (Penthouse Entertainment Television)—
aduitoriented programming (est. Oct 1, 1981)
Setec TV— STV feed: first-run movies, concert
specials, & sporting events (6,8)
Occasional Transmissions— sporting events,
news, & network feeds {6.2/6.8)
Occasional Transmissions — sporting eventst
news, & network feeds (6.2)
PBS (Public Broadcasting)— schedule A pro*
gramming (6.8)

PBS (Public Broadcasting)— schedule B pro-
gramming (6.8)

PBS (Public Broadcasting)— schedule C pro-
gramming (6.8)

P8S (Public Broadcasting) — schedule D pro-
gramming (6.8)
PBS Occasional Feeds (6.8)

ATT/GTE COMSTAR 1/2 (95° W)
Polarization: ODD— Vertical; EVEN— Horizontal

TR — 1 Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds
(5.8/6.2/6.8)

TR — 2 Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds
(5.8/6.2/6.8)

T R — 4 Occasiona I Tra nsmi&sions — teleco nf eren ci ng ,

sporting events, news, & network feeds
(5.8/6,2/6.8)

TR— 6 Bravo— performing and cultural arts program-

ming (6.8 stereo)

TR— 7 NCN (National Christian Network)— religious

(6.8)

Escapade— "floated sex and actior>ortemed
movies only

44 73 Magazme • December, 1981

TR-10

TR- 13

TR— 14

TR— 15

TR
TR

17
18

TR— 19

TR— 21

TR— 22

TR— 24

TR-

TR-2(3»

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

(5*8/6.2/6.8)

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

{5.8/6.2/6,8)

Home Box Cinemax {East)— time- structured

HBO (6.8)

Occasional Transmissions— remote feeds

(5,8/6,2/6,8)

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

(5.8/6.2/6.8)

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

(5.8/6.2/6.8)

TBN (Trinity Broadcasting Network)— religious

(6,8)

Home Box Office (East)— first-ru n movies,

sports, & entertainment specials (6,8)

Occasional Transmissions— remote feeds

(5.8/6.2/6.8)

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

(5.8/6.2/6.8)

Occasional Transmissions— teleconferencing,

sporting events, newsT & network feeds

(5.8/6 2/6.8)

Occasional Transmissions — teleconferencing,

sporting events, news, & network feeds

(5.8/6.2/6.8)

Occasional Transmissions— teleconferencing,

sporting events, news, & network feeds

(5.8/6.2/6.8)

Audio Services on COMSTAR 1/2

7 Family Radio Network (East) (5.8)
Family Radio Network (West) (7,7)

WU WESTAR 3 (91 Q W)
Polarization- All Horizontal

Hughes Sports Netwoik— sports events feeds

(6.2/6,8)

Occasional Transmissions— sporting events,

news, & network feeds (6.2/6.8)

TR-3(5)
TR— 5(9)

TR — 6<ll>

TR— 7{13)

XEW-TVf Mexico City — Mexico's leading net-
work station (6.2)

Occasional Transmissions— sporting events.
news, & network feeds (6.2/6.8)
Private Screenings— sexploitation "R"-rated
movies (6.2)

CBS Network Contract Channel — Irvertaped
network feeds (6.2/6.8)
CBS Cable Network (est. 10-1241)
Robert Wo4d Communications— occasional
transmissions: sporting events, news, & net-
work feeds (6.2/6,8)

HTN (Home Theatre Network) — quality G and
PG movies (6 J)

SIN (Spanish International Network) (6.2)
SPN (Satellite Program Network) — variety
entertainment (6.8)

ABC Network Contract Channel— iive/taped
network feeds (6.2/6.8)
CNN (CabJe News Network) Contract Chan-
nel—news & sporting events feeds (6.2/6.8)
Occasional Transmissions— sporting events,
news, & network feeds (6.2/6,8)
EWT (Eternaf Word TV Network) — religious
(6.8)

Studio liB" (Academy of Health Science)—
medical (6.8)

Editor's Note: This guide is reprinted with the permission of
WESTSAT Communications. WESTSAT publishes the Satel*
lite Channel Chart* six times a year. Subscriptions via first
class mall are available directly from WESTSAT Communica-
tions, PO Box 434, Pleasant on CA 94566. Part I of 73' s Satel-
lite Channel Guide appeared in the November, 1981, issue.

TR<

Tft
TR

«(15)
9(17)

10(19)

11(21)

12(23)

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Satellite Television Glossary

part I

Editors Note: Reprinted with permission of Reed Publications. This glossary is part of trie 86-page Satettiie Television Handbook available
for $7,95 (add $2.00 for 1st class) from Global TV, PO Box 219-H, Maitland FL 32751. Pari II of the glossary will appear in the next issue of 73
Magazine,

Active Device. An electronics component made us-
ing transistors to amplify or control a signal See
Passive Device (next issue).

Adjacent Channel Interference. Signal distortion
because other signals in nearby frequencies are not
properly filtered. A bandpass filter allows only the
selected frequency band to pass through it removing
adjacent channels.

AFC (Automatic Frequency Control). A satellite TV
receiver feedback circuit which prevents the tuning
oscillators from drifting away from the center fre-
quency of the selected channel due to temperature
change or other instabilities. A phase-locked loop
demodulator usually provides an AFC output back to
the LO-

AGC (Automatic Gain Control), A satellite TV
receiver feedback circuit which controls the gain
(amplification) of the i-f amplifiers so that the signal
input to the demodulator will be constant, despite in-
coming signals of varying strength from different
satellite transponders. AGC can be overridden by a
manual gain control to make signal strength mea-
surements in most receivers.

Alignment The process of tuning (or tweaking) a cir-
cuit to compensate for the approximate tolerances
of the components during assembly, using test equip-
ment.

AM (Amplitude Modulation). An easy method of
transmitting program signals on a carrier frequency
where the relative strength (amplitude) of the carrier
is made proportionally equal to the amplitude of the
program signal AM is simpler but more susceptible
to noise than FM, Satellite TV uses FM for both audio
and video modulation, but the user's TV set takes the

46 73 Magaztne • December, 1981

satellite TV receiver's output and detects the video
as AM, the audio as FM.

ANIK 1. A Canadian TV satellite operated by
TELSAT, It has 12 transponders in the vertical format
only and is located at 104 degrees west longitude on
the geostationary orbit belt

ANIK B. A Canadian TV satellite in the ANIK series
located at 109 degrees west longitude, It has 12 ver-
tical transponders.

Aperture Efficiency. The ratio of captured signal to
the theoretical maximum for a given dish anten-
na/feed combination. The design goal is 100% aper-
ture eff iciency, but most TVRO dishes perform at on-
ly 50-60% to attain low noise characteristics and
ease of construction. Some VHF/UHF antennas, on
the other hand, can approach the 100% goal with an
array of reflective elements.

ARO (Audio Receive Only). Small dish antennas used
by radio networks for music and news programming
distribution from TV satellites (mostly WESTARS).
Dishes 2 meters and smaller have been considered by
radio broadcast stations.

Artwork, A printed circuit design term which
describes the printed circuit pattern of etched and
conductor surfaces on a PC board.

Attenuator. A passive device which causes a known
insertion loss in the signal transmission line. It is com-
monly used to prevent a very strong signal from over-
loading a receiver. They are also used as test equip-
ment and in VHF/UHF broadcast reception to elimi-
nate weak ghost signals.

Audio Subcarriers. The sound in a TV satellite com-
posite signal is encoded in a narrow portion of the

video carrier, usually a high-fidelity FM signal at 6.2
or 6.8 MHz as measured after the main signal has
been demodulated. Other satellite subcarriers can
carry digital and text information as well
Azimuth. Compass direction from due north
measured in degrees clockwise, True north can be
found by sighting the star Polaris at night or by ap-
plying a local correction for magnetic deviation to a
compass reading,

Azimuth-Elevation Mount. An inexpensive movable
dish antenna mount and aiming system. It works like
an oarlock where one pivot allows rotation in the
horizontal plane about the azimuth angle from due
north. The other pivot is the elevation above the
horizon. This mount can be more difficult to aim
than a polar mount, See Polar Mount (next issue).
Balun. An impedance-matching passive device locat-
ed between a 750hm coaxial cable and a 300Ohm
device, such as a TV set or VHF/UHF antenna.
Bandpass Filter, A type of electronic frequency filter
which severely limits signal frequencies above and
below the selected frequencies, preventing adjacent
channel interference Satellite TV receivers use these
also to remove noise from around the edges of the se-
lected channel, usually 30 MHz wide

Baseband. This is the output signal of a video
camera, videotape recorder, or satellite TV receiver
before remodulation (so that it can be viewed on an
ordinary TV set). A signal in a satellite TV receiver
goes from 4 GHz through the downconverter to be-
come i-f and then through an FM demodulator to be-
come baseband. American NTSC TV bandwidth is 42
MHz at baseband.

Bearnwidth. The beamwidth of a dish antenna is the
angle of sky which can be illuminated (picked up or
sent out) by the dish. Within that arc satellites can be
seen from the TVRO dish. Large dishes have narrow
beamwidths which reduce noise from its sides. Small
dishes have wider beamwidths and are noisier, but
easier to aim.

Bias. That part of an amplifier circuit which provides
power for a transistor and supplies the energy for its
output signal. On an LNA, the bias circuits are on a
separate PC board.

Bipolar. A type of silicon transistor used in LNAs and
other high-frequency, low-noise devices. They are
superior in noise quality to ordinary transistors but
are inferior to FETs, especially CaAsFETs.
Black Box. An engineering abstraction in which a
device is considered only for its effect, not for its
construction. Naive users can treat satellite TV com-
ponents as black boxes until they are ready to learn
more about them. They need to know only what they
require and how to hook it together
Blanking Pulses. That part of a video TV signal which
for an instant blanks out the screen, enabling the
electron beam to fly back to the start of a horizontal
line or vertical frame. This is wasted time as far as in-
formation transmission is concerned and some
methods for multiplexing data channels into a TV
picture use the vertical blanking interval.
BNC Connector. Easy to lock coaxial cable fittings
which interface signals in the i-f portions of a satellite
TV receiver. They work well in the 70-MHz range.
Breadboard Circuit. A prototype of an electronic cir-

cuit in which changes are easily made, facilitating
construction and debugging of the design.
Broadcast Satellite. A form of international frequen-
cy allocation where only the uplink stations are iden-
tified (licensed). See Fixed Satellite for comparison.
C Band, A loose military designation for 3J-4,2-CHz
microwave frequency band used for the downlinks
of satellite TV signals. Wavelengths are between 8.10
and 7.14 centimeters (3.19 and 2.81 inches).
ON (Carrier to Noise) Ratio* The ratio of the carrier
strength and noise strength measured in dB The
higher the C/N, the higher the S/N and quality of the
resulting TV picture. Above 11 dB is superior, above
7 dB is good, and below that the picture quickly be-
comes extremely noisy. See also S/N (next issue) and
FM Improvement (below).

Cable TV. See CATV below.

Carrier. A strong signal occupying a communications
channel which is modulated (AM, FM, etc J to trans-
mit program information. In an abstract sense, the
carrier transports the program material from the
transmitter to the receiver.

Cassegrain Antenna, A folded beam antenna which
enjoys the advantages of a long focal length (high
aperture efficiency and gain} without the disadvan-
tages of lengthy and awkward feed supports. The
subreflector is hyperbolic in cross section and is
precisely adjusted to concentrate the incoming mi*
crowave fronts to a feed horn located at the center of
the dish. If the subreflector is elliptical in cross sec-
tion, the antenna is also called Gregorian.

CATV [Community Antenna Television). Commonly
known as cable TVr it has a central antenna tower
(VHF/UHF/FM) together with a satellite TV dish
antenna and captures high-quality broadcasts for
subsequent sale through a signal distribution system,
typically using coaxial cables to each home.

CCIR (International Radio Consultative Committee).

A division of the ITU (International Telecommunica-
tions Union) which formulates international stan-
dards for radio communications, including the pre-
emphasis and de-emphasis of satellite TV signals in a
receiver.

CITT (International Telegraph and Telephone Con-
sultative Committee). A division of the ITU (Interna-
tional Telecommunications Union) which formulates
international standards for telegraph and telephone
communications including uplinks and downlinks of
satellite TV. See also CCIR,

Channel. A frequency band allocation which defines
the limits of the contained broadcast carrier signal.
In the USA, channels are allocated by the FCC.
Chip. An integrated circuit or section of a silicon
wafer.

Chip Capacitor. A leadless capacitor small enough to
be soldered directly on mtcrostrip or stripline micro-
wave PC boards. They must be used instead of ordi-
nary capacitors because the leads would alter the in-
ductive characteristics of the circuit. They are used
to build LNAs.

Chroma, That part of the video signal which contains
the color information.

Circular Polarization. Right- or fefthand screw sense
of microwave signal polarization used by INTELSAT,
A hybrid mode feed should be used to avoid the 3-d B

73 Magazine • December, 1981 47

loss with standard linear (vertical and horizontal
polarization) feeds.

Circulator. See Isolator,

Close-Captioned TV. A text service for the hard-of-
hearing TV audience which decodes a text subcarrier
and displays it at the bottom of the TV frame on the
accompanying video picture. It does not interfere
with the standard audio FM subcarrier,
CNR (Carrier to Noise Ratio). See C/N,
Coaxial Cable. A signal transmission line that is made
using a center conductor separated from a shielding
cylindrical outer conductor by a dielectric, usually
polyethylene, sometimes air, in a low-loss applica-
tion.

Commercial TVRCh A strong dish capable of
withstanding hurricane force winds, an LNA with a
lengthy MTBF (Mean Time Between Failures) and
good noise figure, a drift-free, low-distortion
receiver, and a high-quality modulator; all operating
at a 3<IB margin above the receiver's FM threshold.
This system supplies programming for sale through
MATV or CATV distribution.

Common Carrier. An operator or lessor of satellite
TV transponders which in turn leases them to other
parties or transmits programming for others without
controlling or owning the content. 4-CHz satellite TV
is not legally a broadcast service and the FCC does
not make the satellite TV common carriers (RCA
Americom, Western Union ) abide by the con-
straints of broadcasting law.

Comparator. In an FM demodulator using a phase-
locked loop (PLL)f this is the electronic component
which compares the phase relationship of the input
signal with the signal from the tracking local oscilla-
tor (LO). The output signal from the comparator is
proportional to the phase error between the two in-
put signals and is used to control the LO.
Composite TV Signal. This is a combination of video
picture, color, audio, and synchronization informa-
tion.

COMSTAR I. An American satellite which can carry
video but is operated by the telephone company,
AT&T. Since it is underutilized, eventually it will
carry more video. It has 24 transponders, 12 which
are vertical linear polarized and 12 which are hori-
zontal linear polarized. It is located at 128 degrees
west longitude.

COMSTAR II. An American satellite, second in the
COMSTAR series, which has leased 11 transponders
to RCA for cable video programming. It also has 24
transponders and is located at 95 degrees west
longitude.

COMSTAR III. An American satellite, third in the
COMSTAR series, which like its sisters can be ex-
pected to carry more video programming in the
future It also has 24 transponders and is located at
87 degrees west longitude.

dB (decibel). A ratio expressed logarithmically which
allows easy calculation of losses and gains. Two sig-
nals, S1 and S2, can be compared using dB according
to the following equation: dB = 10 log (S1/S2). Often
S2 is a known reference level. If a signal is 3 dB over
the reference, then it is twice as strong; if it is — 3 dB
under the reference, then it is half as strong.
dBi Decibel gain of an antenna over a reference

antenna.

dBm. Decibel power of a signal over a 1 -milliwatt ref-
erence.

dBW, Decibel power of a signal over a 1-Watt refer-
ence.

De-emphasis. A selective restoration of the high-
frequency end of a satellite TV channel within the
satellite TV receiver. This is performed after the FM
carrier is demodulated to baseband. See also Pre-
emphasis (next issue).

Detector. A demodulator circuit in a receiver which
extracts the program signal from the carrier.
Dielectric. An electrical insulator which can carry an
electric field when near a conductor It is used to
make transmission lines, microwave PC boards, and
capacitors.

Diplexer. A section of waveguide which joins two
microwave signals in an uplink Earth station.
Dipole. An active antenna element located in the
feed which collects the concentrated satellite TV sig-
nal and conducts it to the LNA, It is called a probe in
this case.

Directional Coupler, In an MATV or CATV signal
distribution system, this passive device drops a signal
line for a subscriber's TV set from the main trunk line.
It is a superior performance signal splitter from the
high level (strength) trunk line.
Discrete Components- Unlike an integrated circuit
(IC), in this assembly technique each part is built
separately and then assembled.
Discriminator. An FM demodulator circuit in a
satellite TV receiver.

Dithering, See Energy Dispersal Waveform,
DOMSAT (Domestic Satellite). Distinguishes US and
Canadian satellites from INTELSATs.
Double Conversion. This downconversion technique
converts from 4 GHz to the final i-f (typically 70
MHz) in two stages instead of just one, so that poten-
tial image noise from the first mixer stage is
eliminated See also Single Conversion (next issue).
Downconversion. The process of converting the 3J-
4.2-GHz microwave signal down into a frequency
range in which signal processing components are less
expensive. Typically, this is a VHF frequency of
70 MHz.

Downconverter. A microwave part (consisting of
local oscillators (LO), mixers, and bandpass filters)
which accomplishes downconversion. This is the
front end of a satellite TV receiver
Downlink. The communication path from a TV
satellite to its ground (Earth) stations.
Duroid. The brand name of a microwave printed cir-
cuit board specified in many LNA and downconvert-
er plans. Mostly D-5880 22M27 from Rogers Corp.
has been used.

Dynamic Range. The weakest through strongest sig-
nals that a receiver will accept as input. Signals
which are too weak cause excess noise and signals
which are too strong cause overloading and possibly
modulation distortion.

East Coast Feed. Satellite TV programming sched-
uled for the convenience of US east coast viewers
(Eastern Time Zone),

EIRP (Effective Isotropic Radiated Power). A measure
of the relative strength of the satellite TV signal ex-

48 73 Magazine • December, 1981

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pressed in dBW. The USA ranges from 30 in Florida to
37 dBW at boresight in the midwest. Home satellite
TV reception becomes much less expensive at 34
dBW and above, Footprint maps showing relative sig-
nal strengths in EIRP are filed at the FCC and ITU
before the TV satellite is launched.

Elevation, Angle above the horizon measured in
degrees Zero is the horizon and ninety degrees is
directly overhead. Elevation angles are used to aim
the dish antenna at a TV satellite

Energy Dispersal Waveform. This is a triangular-
shaped signal at 30 Hz synchronized with the vertical

blanking interval in the TV signal from the satellite
which ensures that the signal will average its power
out over the whole channel, even when just the car*
rier is present. This waveform is removed by the
receiver after FM demodulation.

Etched PC Board. Acid is used over a mask (artwork]
to dissolve away excess copper conductor leaving a
conductor pattern on the PC board.
F/D. Focal-length-to-diameter ratio of a given dish
antenna. Generally higher ratios yield better aper-
ture efficiencies, but may be more susceptible to
sidelobe noise.

FCC (Federal Communications Commission), The US
agency which regulates communications, including
satellite TV.

Feed. The antenna feed is a section of shaped
waveguide which correctly collects the dish's
reflected microwave signal and conducts it to the
LNA's probe Generally, a feed is uniquely designed
for each dish antenna type-
Feed. A programming term which means a stream of
programming material, for example, in the process of
transmission over the TV satellite. Examples of its
usage are: sports feed, east coast feed, and network
feed.

Feedline. Coaxial cable running from the LNA to the
satellite TV receiver.

FET (Field Effect Transistor)* A low-noise, high-
frequency transistor amplifier which has a current
source, gate, and drain, The gate is a voltage*
controlled resistor which regulates the power flow-
ing from the source to the drain,
Field-Strength Meter, A CATV and TV test device
used to measure power levels on a transmission line
or VHF/UHF antenna

Fixed Satellite. A form of international frequency
band allocation where all the sending (uplink) and
receiving (downlink) stations are identified. This is
the current status of the 4-CHz TV satellite system
See also Broadcast Satellite above.
FM Improvement The potential noise reduction in
an FM signal due to the demodulation process in a
satellite TV receiver. This figure is at most 38.6 dB
and is attained above the FM threshold. Below this
point it rapidly drops from 37.6 dB, Above threshold;
S/N = C/N + 38.6dB,

FM Threshold. An input signal level which is just
enough to enable the demodulator circuits to extract
a good picture from the carrier. With test equipment,
static threshold is the point at which S/N drops more
than 1 dB from the straight graph line: SN = C/N + 38
dB. Typically, FM threshold is 7-8 dB in a satellite TV
receiver with threshold extension.

50 72 Magazine • December, 1901

Footprint. A signal strength map showing the EIRP
contours of equal signal from a TV satellite transpon-
der on a given part of the Earth's surface.
Frequency Agile. This is a feature of satellite TV
receivers which enables them to tune in all the 12 or
24 channels from a satellite Receivers sold without
this feature are dedicated to one channel and can be
tuned by switchable crystals.

Frequency Coordination. A service which uses com-
puters and a USA database to resolve potential or ex-
isting conflicts between various users of the same
+CHZ microwave band. The long-lines (long-dis-
tance) division of the Bell networks uses 4-GHz
microwave towers throughout the USA, A TVRO
looking in the direction of a transmitter may be
jammed unless shielding can be used.
Frequency Modulation (FM). A method of transmit-
ting program material which is more interference-
free than AM, The frequency of the carrier signal is
made proportional to the amplitude of the program
signal.

Frequency Reuse. See Polarization (next issue).
Front -to-Back Ratio- The ratio in dB of the antenna
gain in the forwards direction to the antenna gain in
the rear direction It is a measure of the noise poten-
tial from the rear.

C/T (Gain over Noise Temperature)* A TVRO measure
of quality expressed in dB. The higher this figure, the
better the system. It can be improved by increasing
gain or by decreasing the system noise, C/T (degrees
Kelvin)= antenna gain/log (antenna noise tempera-
ture + LNA noise temperature)

GaAsFET (Gallium Arsenide Field Effect Transistor).
This low-noise device, although expensive, is used in
the highest quality LNAs. The term is pronounced
gasfet.

Geostationary. Dubbed the Clarke Orbit in honor of
Arthur C Clarke who first described it, This circular
orbit above the equator is precisely the altitude at
which any size satellite will revolve around the Earth
once every 24 hours, From the ground below, it thus
appears parked in space overhead, and from above,
one-third of the Earth's surface can be seen, TV satel-
lites are separated by 4 degree intervals on this orbit
to avoid mutual interference 38,000 km (22,300
miles) high.

Ghost. One or more dim copies in a TV picture
caused by reflected VHF or UHF broadcasts. Also
called multipath distortion, this is not present in
satellite TV signals because extremely directional
dish antennas are used.

GHz (Gigahertz). The standard abbreviation for
billions of cycles per second. 3J-4.2 GHz is the
microwave frequency band allocated for satellite TV
in the USA.

Global Beam. An INTELSAT antenna downlink pat-
tern covering a third of the Earth's surface, They are
boresighted at the middle of an ocean to provide ser-
vice to nations all the way around the ocean basin.

Guard Channel, Unused portions of the frequency
spectrum which are located between program chan-
nels to prevent adjacent channel interference.
Harmonics. Spurious signals produced by an oscilla-
tor circuit which occur at integral multiples above
the resonant frequency of the oscillator. They appear

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73 Magazine • December, 1981 51

like overtones on a single piano note They can cause
design problems in a receiver circuit unless proper
filters are used to remove unwanted harmonics,
HBO (Home Box Office). The most popular pay-TV
network which is distributed on SATCOM PL
Headend. The point on a signal distribution system
where UHF/VHF/FM and satellite TV signals are cap*
tured, combined, and fed into the system.
Hemispherical Beam. An INTELSAT antenna down-
link pattern consisting of two overlapping spot
beams to cover a hemisphere.

High Pass Filter. A circuit which features high im-
pedance for relatively low frequencies and low im-
pedance for high frequencies, in effect blocking the
low-frequency component in a signal. See also Low
Pass Filter and Bandpass Filter*

Horn Antenna. A type of satellite TV antenna which
is shielded against sidelobe interference. The incom-
ing signal is reflected 90 degrees into a cone-shaped
feedhorn They are much more expensive than a dish
antenna of the same aperture.

IC (Integrated Circuit). A solid state complex device
which is mass produced on single silicon chips.
I-f (Intermediate Frequency). For satellite TV
receivers, this is usually 70 MHz and is the frequency
at which most of the signal processing takes place
because the design is simplified and 70-MHz parts
are less expensive than 4-CHz equivalents,
I-f Strip. A PC module which amplifies and filters the
output signal of the downconverter in a receiver and
inputs it to the FM demodulater Its gain is controlled

SUB AUDIBLE TONE
FOR THE ICOM 1C2A/AT

The Tfan^ Com model 401 vub audflle tone encoder is designed to
bf easily installed fn the ICOM IC2A,< AT. Simple installation requir-
ing only three connections are all thar \s needed to operate your
ICZA^Ar on a tone access repeater.

102 DTMF Repeater Controller
The \ 01 DTMF Controller Is a modular system designed to provtde
on-off remote-control functions using the standard 12 or 1 6 digit
Touch tone signaling through wire line or radio links. Using modular
design up to 16 on-olf or momentary control functions can oe pro
vided

FUTURES

Compatible with PL, CG and most oiher tone control

tow current

Small 5sze 10*6 x 3"

Low tone distortion of less than I H THD

Tone stability * .Zhz from - 20C to + 70 C

Can easily be instaited *n most other radios

Comes wired and tested

two year warranty.

Features

Modular design, rack mount

Plug in DTMF receiver using the latest technology In DTMF

decocting — no Til s

Three types of control cards

GN-OFF OPEN COLLECTOR TRANSISTOR

ONOFF LATCHED RELAY OUT-PUT

MOMENTARY RELAY OUTfHJT
Each card can decode a 2. 1 or 4 digit code using any of the
16 digits

Easy to install and use
Two year warranty

For more information or to order caU or write;

Trans Com Inc.

703-13 AnnorenoDr. Addison, III.. 60101
(3 12) 543-905S

^75

52 73 Magazine ■ December, 1981

by the ACC circuit.

Image Noise, When a signal is downcon verted using
a mixer and LO, noise can be passed through the
system that is on the mirror image frequency from
the selected channel with the LO frequency as the
point of symmetry. Subsequent bandpass filters
remove this noise in double-conversion downcon-
verters. A preselector filter in single-conversion re-
ceivers does the same thing.

Impedance. The relative ease with which signals pass
through a device or conductor measured in Ohms.
Impedance Matching. The design of a signal inter-
face such that the signal transmitted through it is
maximized and the reflected signal is minimized.
Standard impedance for LNAs is 50 Ohms and for
satellite i-f circuits 75 Ohms. Most signal distribution
systems interface at 75 Ohms impedance.

INTELSAT, International (primarily non-communist)
satellite agency whose member nations lease tran-
sponder capacity on its satellite system It provides
at least some TV in all parts of the world, but signal
tIRP is often quite less than US domestic satellites.

Isolator. A device which is a one-way valve for

microwave signals which prevents stray receiver sig-
nals from leaking out past the LNA onto the antenna.
It also facilitates the design of the LNA by im-
pedance matching the feed probe to the first LNA
amplifier stage. Most LNAs have an isolator attached
between the CPR-229 feed flange and the main am-
plifier box.

Kelvin. The scientific temperature scale which
measures thermal noise characteristics of micro-
wave devices. Performance improves with decreas-
ing noise temperature 0° K equals ^273 degrees
Celsius and —459 degrees F. The Kelvin scale starts
at absolute zero and is graduated like the Celsius
scale.

Launch Vehicle. A NASA term for the rocket used to
place satellites in orbit. For TV satellites this is usual-
ly the Delta, although the Space Shuttle will take
over this job in the 1980s.

Level (High or Low). In communications, level means
the same as amplitude or relative strength.
LO (Local Oscillator). A closely-connected frequency
source which is typically controlled by a resonating
crystal or by an input voltage. See also VCO and VTO
(next /ssuej. They are a major component of down-
converters and demodulators in receivers

Lobe. An area of strong reception in a graph of anten-
na gain versus angle off boresight. In highly direc-
tional dish antennas, the front lobe is high gain and
the side and back lobes are much weaker.

Look Angle. Pointing angles for aiming an antenna at
a TV satellite for a given site This term is also used
when referring to antenna elevation alone, It is im-
portant when considering possible site obstructions
or extra antenna noise due to a low elevation (look
angle)

Low Pass Filter A circuit which features high im-
pedance for relatively high frequencies and low im-
pedance for low frequencies, tn effect blocking the
high-frequency component in a signal. See also High
Pass Filter and Bandpass Filter above,
Luminance. That part of a video signal which con-
trols the brightness of the image on the TV screen,

Reader Sen/tee tor t&cmg page ** 74*

Movie Stars
Concert Stars

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Your favorite stj ommg nff the satellites right now in

one of thetueatost selections ot family and adult entertainment
ever offered And now there's a new satellite receiver system
that puts it all within your reach at a pnee that s within reach.

The new Heathkit Earth Station

It includes a 3-meter Sat*. Antenna with a single-axis
adjustable mount that lets you direct vour antenna to receive
signals from the entire satellite arc. It s a heavy-duty, eommer-
ciai-qualtty antenna, made by Scientific- Atlanta and designed for
long, reliable performance.

Special L & Amplifier End Down-Converter converts

signals to 500 MHz band for transmission on ordinary TV cable.

The Receiver features electronically-synthesized tuning for
stable, drift-free reception, and 24 channel selections for a broad
variety of programming It even includes a special Zenith Space
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Spec at Earth Foundation Kit anchors your antenna firmly to
withstand winds of up to 100 mph,

Unique Site Survey Kit

You can trust Heath to do it right The first step in establishing

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to the satellites So you know your location is correct before you
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Easy-to-follow, step-by-step assembly

Like all Heathkit products, the Satellite Earth Station includes
a clearly written manual that guides you every step of the way
through assembly and installation And over-the-phone
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For complete details and prices on the Heathkit Earth Station
and 400 other electronic kits for home, work or play, send today
for the latest free Heathkit Catalog or visit your nearby Heathkit
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Send for free catalog

Write to Heath Co., Dept 011-844,
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Visit your Heathkit Store

y Heathkit products

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ng of some satellite TV channels mav require the custom stain

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TVRO Receivers:
The Inside Story

Satellite Central, part II

Getting 4-GHz signals
down to watchable
video is no easy feat. Noted
satellite TV pioneer Paul
Shuch N6TX once observed
that there are perhaps as
many receiver designs as
there are receiver desig-
ners. Despite the fact that
satellite TV is new, we've
already experienced at
least two generations worth
of improvements in receiv-
er design philosophy. Both
methods employ your gar-
den-variety superhetero-
dyne conversion principle.
But that's about the only
similarity.

The major hassle is deal-
ing with the microwave sig-
nal itself. The components
are either too expensive
and hard to get or they are

incredibly fragile and roll
over and turn belly up when
you approach them with a
soldering iron! So the logi-
cal solution is to convert
the troublesome 4-GHz sig-
nal down to something we
can massage with parts we
can understand, like coils
and capacitors rather than
pea-sized chip caps and PC
board traces that are al-
leged to be tuned circuits!
There will be plenty of time
for that later. For the time
being, let's just get our
feet wet.

Referring to Fig. 1r we
have a typical dual-conver-
sion receiver design. This is
the "classic" or "by-the-
book" method used by
most commercial firms to-
day. A voltage-tunable lo-

cal oscillator (LO) mixes
with the incoming 4-GHz
signal down to a 400- to
1200-MHz first intermedi-
ate frequency (i-f)t This is in
keeping with the spirit of a
textbook approach of se-
lecting an i-f about one-
tenth of the incoming signal
(the "divide-by-10" rule}.
After some needed amplifi-
cation, the signal is mixed
again down to what is
known as baseband (be-
cause we're done with con-
version), amplified even
more, and then detected
with either a PLL or discrim-
inator circuit. Baseband is
generally 70 MHz, an in-
dustry standard.

So Much For Basics

The key points worth

SIGNAL

-50 T0-*04*»

111 lit l-F M

MIXEP 4OO-l£00UHf HIKER

2 ad I-F
7QI*Ht

70WHI
BAN0PA5S

orrtCTOfl

PROCESS

•0204b
Gain

©"

VTO
i AVCffTEM
8240 I

20-30UHI
WIDTH

PLL OH
DISCRIMINATOR

30-604*
GAIM

©■

VTO
IAVENTEK
0090)

DC EMPHA^iS
AMD CLAMP

VIDCO
OUT

AUOlO

t ZMttl

6 f HMf

AUDIO 1
AUDIO 2

Fig. 1. Dual-conversion design The first VTO mixes with the downlink signal into the first i-f
amplifier. The second VTO is fixed. Cain distribution may vary in different designs. The
70-MHz bandpass filter must be flat in the passband for best results.

54 73 Magazine * December, 1981

noting here are conversion
to a lower frequency where
we can crank in lots of
easy-to-find gain, and
sticking to the rules. But
why do that? Well, conver-
sion makes a lot of sense
After all, the incoming
signal may very well be
around — 50 to — 60 dBrn at
4 GHz and a 564 PLL detec-
tor chip wants something
quite different before it will
deliver pictures.

But who made the rules
about dividing by 10 and
that nonsense? The guys
that got there first, of
course. They did some
arithmetic and made a dis-
covery of some impor-
tance. A single-conversion
design has problems if you
chose a first (and only) LO
just 70 MHz from the de-
sired signal. You get down
to baseband a lot quicker,
but you get something else
in the bargain. . the image
signal as seen in Fig, 2.

Remember from last
month's Satellite Central
that the satellite band (3.7
to 4.2 GHz) is 500 MHz
wide So even an LO spaced
some distance away#
whether above or below the

desired frequency, can still
convert an undesired image
signal to baseband.

Now you could filter out
the image on the front end,
but you would have to
make the filter track with
the LO to remove all im-
ages as you tuned At these
frequencies, a tracking fil-
ter is no easy beast to tame.
So rather than wrestle with
the problem, receiver de-
signers such as Stanford
professor Taylor Howard
W6HD adopted the dual-
conversion philosophy and
proceeded to knock 'em
dead with the first low-cost
TVRO! The design has be-
come a sort of standard of
this new industry with sev-
eral manufacturers dupli-
cating it piece by piece,
even to the last resistor,
probably because Howard
made his complete design
available to anyone.

An Interesting
Turn of Events

As an historical note,
Howard designed his re-
ceiver with available com-
ponents. The key word here
is "available/' White you
could indeed call Avantek
and order an 8240 voltage-
tuned oscillator (VTO) or
call Vari-L for a DBM-500
mixer, you also could sit
around and tear pages off
your calendar while waiting
for delivery! I had time to
traipse all over California
scouting up surplus dishes
as the clock ticked away.

Clearly, something had
to be done. Several ama-
teurs, most notably Robert
Coleman K4AWB, made an
interesting discovery. Not
only were surplus mixers
lying around, but single
conversion could be made
to work! A quick doodle
with pencil and paper sug-
gested it might be worth the
trouble.

If we want to receive
transponder 17 on SAT-
COM 1, its frequency is
4040 MHz, Setting the LO
down 70 MHz, to 3970
MHz, will indeed pull tran-

sponder 1 7 into our 70-MHz
i-f, but also the image fre-
quency as well, which is 70
MHz below the LO Now it
happens that's dead-on
transponder 10 at 3900
MHz. So it can't possibly
workl Or can it? We know
that RCA and COMSTAR
birds have 24 transponders.
And we also know that the
odd-numbered transpon-
ders (such as transponder
17) are vertically polarized.
But if the even transpon-
ders are horizontally polar-
ized (such as transponder
10), then our receiving an-
tenna will be cross-polar-
ized to the interfering signal
and hopefully ignore it!

So it appears that single
conversion does indeed
work despite the prospects
of image noise. There is a
limit. As a rule, cross-polari-
zation may only reduce the
image signal 20 dB, but re-
cent efforts at image-reject
mixer design and a new
tracking filter eliminate this
annoyance, as seen in Fig. 3,

Baseband At Last

Nearly all of the fore-
going problems are a result
of wideband FM video de-
tection circuitry not work-
ing too well at high inter-
mediate frequencies How-
ever, it can be made to
work, A few manufacturers
have designed excellent
discrete PLL circuits that
work at 700 MHz, making
signal conversion a piece
of cake. But 70 MHz re-
mains as the i-f most used at
the moment.

As I mentioned before,

OPTIONAL
PRESELECTOR

quite a few receiver designs
utilize a 5b4 PLL detector
chip at the end of the
70-MHz hf chain. The prob-
lem here is that the 564 is
rated to only 50 MHz Still,
a handful of 5b4s will al-
ways yield several that
work at higher frequencies,
depending on the source.
But a drastic improvement
is 564 operation can be had
by cleverly dividing the
70-MHz i-f signals by two
with a cheap JK flip-flop
chip like a 74LS112 and op-
erating it at 35 MHz!

Other detector designs in
use today are quadrature
detectors and linear dis-
criminators. They offer ad-
vantages and disadvan-
tages when compared to
the PLL. While the PLL of-
fers excellent performance
at receiver threshold and
below, it takes second
place to the discriminator
and quadrature-type detec-
tor when signals are well
above threshold. Remem-
ber from last month that
we must try for a carrier-
to-noise ratio of about 10
dB or better for clear pic-
tures. (That translates to at
least a 12-foot dish and a
120° LNA for most loca-
tions in the USA.) Still, you
don't need nearly as much
gain for a PLL as you do a
discriminator.

To work properly, the
discriminator must see a
signal that is amplified well
into limiting This is the
main reason why quality re-
ceivers look bad compared
to cheapy models when
tested on marginal systems.

3.7-4.2 0«l >-

IMAGE

REJECT

MIXER

5O0UHI TVRO BAUD

I 70 TO

urn M«f

FREQUENCY

UHD£Si*fD

QC*l*£0
SWaAL

Fig. 2. An in-band LO can
produce an undesired image

signal. Luckily, this image
is cross-polarized to the
desired signal. It's not
enough for perfect pictures,
so other methods are neces-
sary to ensure adequate im-
age rejection.

SATELLITE TV
HAM NET!

Tune in Sundays at 1600
GMT on 14,311 MHz for
the Satellite TV Net. Lind-
sey Riddle W5JG in New
Orleans is Net Control.
Then Ken Rae WB0POP
takes the reins at 1900
GMT. You* 1 1 be amazed at
what you can learn in just
an hour or so.

But just cranking up the
gain is not enough, as some
experimenters will tell you,
because not all if amplifi-
ers will limit symmetrically;
A weak location or a
smaller dish can still be
made to work, thanks to the
PLL.

But suppose you've dug
deep into your pocketbook
and found enough money
to allow you to build your
system so it operates well
above threshold^ Then the
discriminator or quadrature
detectors really shine be-
cause the PLL can some-
times break up an other-

TRACKING
FILTER

h&^

70MH*
BAND PAS S

DLTfcCIOH

PROCESS

20 30MH1
WIDTH

PLL OR
DISCRIMINATOR

5D4b*
GAIN
t«C5t2J HiC

MC i J50 MOT I

VTO

lAVEMtlk
0360) m

DE-EMPHASIS

AMD CLAMP

VIDEO

AUDIO

6 ZMHl

fi.SMHl

AUDIO 1

-• AUDIO 2

Fig. 3. Single-conversion design. The problem with single conversion is that an image signal
can be detected, Tracking filters and clever image-reject mixer design can reduce the image
by 20 dB or more, A good high-gain LNA will overcome mixer losses in this design.

73 Magazine • December, 1981 55

HOfttfOMTJLL SYNC
TIPS CL*M*»ED TO DC

Fig. 4. (a) Video demodulator output showing video riding on energy dispersal wave, (b)
Energy dispersal wave eliminated by dc clamp circuit.

UNGLAUPED
VID-EO IN >-

OUT

SYMC

DET-TfltG

CLAMPED
■*■ VIDEO
OUT

SAMPLE

AND

HOLD

Fig. 5, Typical diode clamp circuit used in economy receivers vs. feedback clamping taken
from voltage samples of the video signal during the sync pulse interval.

wise fine picture when
tracking wide deviations.
You see an annoying streak*
ing effect in the video.
Tweaking the bandwidth
can help to cure this
problem.

Now if the PLL works
pretty well at the 35-MHz
reduced i-f, you might
wonder what would happen
if we divided again and
again down to nearly dc.
Perhaps the only problem
with that idea is that we
bump into Carson's rule
along the way+ Simply
stated, the practical band-
width of a frequency modu-
lated signal should be equal
to twice the sum of the
maximum frequency devia-
tion and the highest modu-
lating frequency. If we
know the typical frequency
deviation as 1075 MHz,
then twice the highest mod-
ulating frequency (how
about 5 MHz for video?)
when added to this devia-
tion yields a projected
bandwidth of 31 .5 MHz Ac-
tually, it could be more if
we lay in a 6.2-MHz or a
6.8-MHz sound subcarrier,
Bandwidth = 2 (10.75 MHz
+ 5 MHz) =31 ,5 MHz.

Watching Intelligent Noise

Okay, how wide an i-f is
necessary? It really de-

pends on your carrter-to-
noise ratio (C/N). If you
have a small dish in a weak
footprint, you may very
well be at threshold or be*
low. A wide i-f bandwidth
will only make matters
worse because you will
appear to be seeing more
noise than video. While our
eyes tend to integrate
enough to discern intelli-
gence, nice and clear pic-
tures are what we really
want. If you worked out the
downlink equations we dis-
cussed last month, you well
know that restricting the
bandwidth by more than
Carson's rule can make a
big improvement in C/N.
But there is a limit.

The problem then is to
figure out how to squeeze a
wide car into a narrow
garage! If we don't mind
scratching the chrome, we
can just barely get it in.
Likewise, we can reduce the
i-f bandwidth to 17 MHz or
so and have viewable vid-
eo, but at the expense of
the finish on the pictures.
More importantly, the carri-
er-to-noise ratio may im-
prove enough to make the
pictures very watchable.
That is until you wonder
what happened to the def-
inition and why the frizzy
effect when flat color fields

are transmitted. Clearly,
there is a limit to bandwidth
restriction. Whatever was
out there at those wide
deviations is gone now!

You can reduce the dis-
tortion somewhat if you
turn down the color and
watch everything in black
and white, but that's taking
a giant step backwards. In
fact, you might just as well
turn down the sound, too,
because all you'll hear is
the sound of birdshot being
dropped on a cookie sheet!
Nothing takes the place of a
large dish and a good
LNA . . nothing.

Beyond Detection

The sound channel is
easy to detect. It is merely
an FM subcarrier that may
be 6.2 MHz or 6 8 MHz
Most receivers are
equipped to receive both
inasmuch as detection for
each subcarrier can be
done in a single consumer
TV sound section IC such as
the CA3065 As a rule,
6.8-MHz subcarriers are
used on RCA/SATCOM
birds, while 6.2-MHz sub-
carriers are found on West-
ern Union/WESTAR birds.
Nothing is standard, so a
switchable or tunable
sound subcarrier detector is
necessary.

Other subcarriers may be
located above video on
some transponders. Back-
ground music and slow-
scan services as wel I as data
transmissions can be found.
We will be sure to look at
methods of recovering
these signals in future
installments of Satellite
Central.

Satellite TV signals are
pre-emphasized according
to a CCIR curve. This
amounts to a 10- to 12-dB
boost on the high end of the
video. An LC network
smoothes the curve back
out as well as wiping out
the sound subcarriers
before further video
amplification.

Fig. 4(a) shows the output
of a typical detector after
de-emphasis Notice the un-
damped video appears to
be riding on a triangular
wave at the frame rate This
is known as the energy dis-
persal waveform and is
mixed in at the uplink trans-
mitter. It is simply a way to
keep the main carrier mov-
ing during the unlikely loss
of video. That way, every
microwave link in the coun-
try on that frequency
doesn't get sprayed with an
interfering carrier from
space. As a practical mat-
ter, it's quite the other way
around. In any event, a
clamp nails the energy dis-
persal waveform down to
dc in Fig, 4(b) and we have
clean video. If this wave-
form is not removed, the
picture will flicker at the
304Hz rate-
Some TVRO receivers
have modulators in them so
the detected video and
sound can be fed directly to
a TV set Others may only
have a one-volt audio and
video output While a
cheap TV game modulator
can be used to get the pic-
ture into channel 3 or 4 of
your TV, the results leave
much to be desired. Some-
times it's simply the result
of poor design. But poor
shielding is the likely cul-
prit. The modulator output

56 73 Magazine * December, 1981

WE WILL NOT BE UNDERSOLD!!

Complete Systems, Antennas,
Receivers, LNA's & Accessories

CALL US TODAY!

812-238-1456

Nation's Largest Total Communications Distributor"
P.O. BOX 3300 • TERRE HAUTE, INDIANA 47803 -

See if st of Advertisers on page 162

73 Magazine * December, 1981 57

manages to find a way back
into your 70-MHz i-f chain
(remember that channels 3
and 4 would fall into the i-f
bandpass of 55-85 MHz).
The solution is to skip the
re-modulation process and
feed the audio and video in-
to a quality TV monitor or a
regular TV modified for
audio and video input. On
the other hand, an effort-
less method is to simply
feed the TVRO receiver in-
to a video tape recorder
and use its internal
modulator!

Obvious Differences

While price may be the
major obstacle to designing
an ideal receiver, experi-
ence with the problems
you're likely to encounter
runs a close second. As we
learn more about what can
and can't be done, we can
make adjustments to our
thinking and our design. For
example, the VTO used in
most receivers is a real has-
sle. You have 500 MHz
worth of tuning spread over
about a 270-degree twist on
the pot. That's a lot for
manual tuning (over 470
standard broadcast bands!},
so afc is needed, if not for
sheer operator ease, then
for the very small amount
of drift you'll likely en-
counter. Fancy receivers
use a synthesizer and elim-
inate the problem. That
takes more parts, which
adds to the price . . . but not
too much if you do it
yourself!

You can sometimes dis-
cern a quality receiver de-
sign from an economy ver-
sion by observing how well
the energy dispersal clamp
circuit functions. While
simple receivers use a sim-
ple diode clamp, more ex-
pensive {and better de-
signed) versions employ
voltage feedback methods
such as seen in Fig. 5.

By far the most interest-
ing difference in receivers
today is the concept of
splitting them up into
pieces as some economy-

58 73 Magazine ■ December,

minded manufacturers
have done. This eliminates
the need for expensive coax
to carry the 4-CHz signal
from the LNA to the receiv-
er. They simply mount the
mixer, VTOP and first i-f at
the dish and run the lower
i-f to the house on RG-59,
Some really clever LNA
manufacturers are building
the whole works into a sin-
gle LNA and downconver-
ter, calling it an LNC!

Tricks Worth Trying

If you want to try your
hand at receiver design, go
ahead with the certain
knowledge that much of
the foregoing works well
enough to be a good point
of departure for your own
design fantasies. Micro-
wave genius Steve Birkill
G8AKQ, of Sheffield, Eng-
land, downcon verts into a
broadbanded UHF TV tuner.
He does the first conversion
to UHF at the antenna so
that RG-59 can be used
rather than the expensive
4-GHz stuff. The UHF tuner
then performs the second
conversion down to an i-f
the PLL can handle.

The cost of tuners like
Steve's is around 25 bucks.
Some of the newer varactor
tuners are very broadband
except for a coil in the last
stage. A few moments of
work are all that's neces-
sary to modify the stage for
the wide bandwidth needed
for good pictures. Does the
idea sound interesting^
Then how about following
the tuner with a very cheap
TV IC amplifier chip such as
the MC1350 for your i-f am-
plifier? And if you don't like
that PLL, then why not use
an MC1357 FM quadrature
detector chip instead? Rex
Rhoads, an engineer with
RCA, has done it with excel-
lent results. By the way, the
construction cost of his en-
tire receiver using this very
conventional circuitry (no
secret chips or tricks) is way
under $100!

The time is right for you
to join in the fun of receiv-

1981

The Nelson Parabolic TVRO Antenna Manual

by Nelson Ethier

reviewed by:

S.F. Mitchell WA40SR and Richard Christian WA4CVP

As the foreword in the Manual states, author Ethier has no
formal microwave training, but "he is an excellent student of
obscure textbooks and an avid do-it-himselfer. . . f

The Nelson Parabolic TVRO Antenna Manual starts with a
general discussion of parabolic dish design and describes
the relative advantages of a parabolic antenna over the spher-
ical antenna. These advantages include the fact that the
focus never changes and that the entire surface works to col-
lect the signal. A brief review of noise, noise measurement (dB
and degrees K), calculation of antenna gain, wavelength, and
formulas to find parameters follows. Nelson then gives the
arguments for different focal ratios and the reasons why he
selected an f/d (focal point to diameter) ratio of 0,375,

Very detailed treatment is given to the calculation of the
parabolic curve for his antenna. The formula and a method of
laying out the curve on graph paper is presented along with a
table with the curve calculated in one-half-inch steps for a
10-foot dish with a .45 f/d ratio or a 12- foot dish with a .375 f/d
ratio. These calculations are very simple and can be done on a
calculator with a square root function,

The most informative part for us was the section on choos-
ing the antenna to suit the needs of a particular site. A brief
discussion of the significance of the carrier-to-noise ratio
(CNR) and an example of its calculation gives you an idea of
the type of picture quality you should be able to obtain at your
location,

The material between page 11 and the Manual's end on
page 31 is devoted to the actual construction of a 12-foot
parabolic antenna, feed, feedhorn, and polar mount. The
antenna is built on a form which must be fabricated with
plywood and fiberglass rods, The form is constructed and
covered with 0,020 sheet aluminum which must be cut and
formed. Fiberglass is then applied to the back of the alumi-
num. Reinforcing ribs of wood and urethane are then added
and a second layer of fiberglass is applied. The finished
antenna appears to be quite sturdy; Although no estimate of
the antenna's cost is given by Ethier, we estimate that it
would cost between $750 and $1000 and require as much as
two months of steady work to complete.

Pages 23 to 29 describe the fabrication of the feed, feed-
horn, and mount. The feed itself is an aluminum tripod bolted
to the rim of the dish. It appears that this system, which in-
volves using an antenna rotator to turn the horn, may put un-
due stress on the feed assembly.

Overall, we feel that the Manual gives a lot of good informa-
tion, but it gives very little that we haven't seen elsewhere. The
best part of the manual is the first ten pages where antennas
and system requirements in general are discussed. The ac-
tual construction of the antenna may not be practical since a
commercial antenna can be as cheap, if not cheaper. The
Nelson Parabolic TVRO Antenna Manual is well worth $15.00,
but at the $30.00 cover price we feel that it is very expensive.
The Nelson Manual is available from the publisher, Satellite
Television Technology, PO Box G, Arcadia OK 73007.

This review is reprinted from 'Lite News, PO Box 973, Mobile
AL 36601.

ing TV from space. If you
have a question regarding
the topics we cover here,
feel free to drop me a line
(letters only, no calls
please). Sorry, I can only an-
swer mail that is accompa-
nied by an SASE.

You can find out more
about receivers by reading
two back issues of 73: No-
vember, 1979 {"The Satel-
lite TV Primer/' Bob Cooper)
and December J 979 ("Low-
Cost Receiver for Satellite
TV," Paul Shuch).B

Reader Se/vtee for facing page **331—

•-

2-M Handheld FM Transceiver

AZDEM PCS-3QO

i n

6.fl*u

SCAN

ao«s -:

BO
a

VtffllTt

y3CK

Of*

MOD€

7-3" high by 2 .5" wide by 1.8'

8 MHZ COVERAGE • 142 to 149,995 MHz in 5 kHz steps, including CAP and
MARS.

IDEAL SIZE & WEIGHT DISTRIBUTION

deep; 1.4 lbs.

MICROCOMPUTER CONTROL • All frequency operations are done by
means of a microcomputer keyboard with acquisiuon tone.

LCD DISPLAY WITH TIMED LAMP • Draws almost no current Lamp
times out automatically after 20 seconds.

16 KEY AUTOPATCH * Keyboard works as a Touchtone* pad while
transmitting.

PL TONE SWITCH * Actuates optional subaudibte tone module.

PROGRAMMABLE "ODD SPLITS" • Transmit and receive on any
possible frequency combination. Reset in seconds.

9 CHANNEL MEMORY WITH SCAN • Eight addressable channels and
one externally accessible upfdown channel retain frequency and standard offset,
Backup drain is a scant 10 microamps!

AUTOMATIC INCLUSIVE OR EXCLUSIVE PROGRAMMABLE

BAND SCAN • Limits may be reset in seconds. Scans either inside or
outside the limits.

BUSY AND VACANT SCAN MODES • Scan for either an occupied or
empty frequency.

KEYBQARD LOCK • Prevents accidental change of frequency or scan status.

TRANSMIT LOCK • Avoids unintentional transmission.

DIGITAL S/RF AND MEMORY ADDRESS METER • Shows

relative stgna! strength on receive, relative power on transmit. Also shows
memory address.

HIGH OR LOW POWER • 3 watts high, 1 watt low. Low power is
continuously adjustable from 0.5 to 3 watts,

TRUE FM * Not phase modulation - Unparalleled audio quality.

AUTOMATIC FRONT END TUNING • RF stage is varactor tuned for
superior sensitivity and selectivity

RUGGED COMMERCIAL-GRADE MODULAR CONSTRUCTION

The PCS-3QQ is built to tate years of the toughest operating conditions

SUPERIOR RECEIVER • Sensitivity is 0.25 uV for 20 dB quieting,
Q.2uVfer12dBSlNAD.

BNC ANTENNA CONNECTOR •

STANDARD ACCESSORIES • Heavy duty NICAD battery pack 1 500
mAh), belt clip, hand strap connector, flexible rubber antenna, earphone,
ac charging unit, and special stand for table-top operation.

OPTIONAL ACCESSORIES * Deluxe feather case, mobile dc
charging cord, external speaker/microphone, and PL tone module.

JUFACTUF

JAPAN PIE20 CO., LTD.

chome *ku, Mitaka. Tokv Fetex 781-2822452

EXCLUSIVE DISTRIBUTOR AMATEUR-WHOLESALE ELECTRONICS, INC.

6817 SW 129 Terrace, Miami, RofKJaG

Telex 60-3356 Toil-free (800)

TS-130S/V

"'Small wonder''..* speech processor,
N/W switch, IF shift digital display

The compact, all solid-state
HF SSB/CW mobile or fixed

station TS-130 Series trans-
ceiver covers 3 5 to 29,7 MHz,
including the three new bands.

TS-130 SERIES FEATURES:

• 80-10 meters, including the
new 10, 18. and 2 4 -MHz
bands. Receives WWV.

TS-130S runs 200 W PEPH60
W DC input on 80-15 meters
and 160 W PEP/140 W DC on
12 and 10 meters, TS-13QV
runs 25 W PEP/20 W DC

input on all bands,
Built-in speech processor.
Narrow/wide filter selection on
both CW (500 Hz or 270 Hz)
and SSB (1.8 kHz) with
optional fitters.

• Automatic selection of side-
band mode (LSB on 40
meters and below, and USB
on 30 meters and above). SSB
REVERSE switch provided,

• Built-in digital display

• Built-in RF attenuator.

• IF shift {passband tuning).

• Effective noise blanker.

OPTIONAL ACCESSORIES:

• PS-3Q base-station power
supply.

• YK-88C (500 Hz) or
YK-88CN (270 Hz) CW filter.

• YK-88SN (18 kHz) narrow

SSB filter.

• AT-130 compact antenna tuner
(80-10 meters, including three
new bands).

• SP-120 external speaker.

VFO-120 remote VFO.
MB-100 mobiie mounting

bracket.

PS-20 base-station power

supply forTS-130V,

Optional DFC-230 Digital
Frequency Controller

Frequency control in 20-Hz
steps with UP/DOWN micro-
phone (supplied with DFC-230).
Four memories and digital

display. (Also operates with
TS-120S, TS-530S. and
TS-830S.)

PS- 30

SP-120

TS-130S

VFO-120

sl MM

:>af''\ \ mm im tm.

SP-230

TS-B30S

VFO-230

AT-230

'Top-notch7' * • VBX notch,
IF shift, wide dynamic range

The TS-830S has every con-
ceivable operating feature
built-in for 160-10 meters (in-
cluding the three new bands),
It combines a high dynamic
range with variable bandwidth
tuning (VBT), IF shift, and an IF
notch filter, as well as very
sharp filters in the 455-kHz
second IR Its optional
VFO-230 remote digital VFO
provides five memories.

TS-830S FEATURES:

• LSB, USB, and CW on 160-10
meters, including the new 10,
18, and 24-MHz bands.
Receives WWV,

• Wide receiver dynamic
range, Junction FETs in the
balanced mixer, MOSFET RF
amplifier at low level, and
dual resonator for each band.

• Variable bandwidth tuning
(VBT), Varies fF filter pass-
band width.

» Notch filter (high-Q active
circuit in 455-kHz second IF

• IF shift (passband tuning).

• Built-in digital display (six
digits, fluorescent tubes),
analog dial, and display
hold (DH) switch.

• Noise-blanker threshold level
control

• 6146B final with RF negative
feedback. Runs 220 W PEP
(SSBJ/180 W DC (CW) input
on all bands

• Built-in RF speech processor.

• Narrow/wide filter selection
on CW.

• SSB monitor circuit to check
transmitted audio quality.

• RJT (receiver incremental
tuning) and XIT (transmitter
incremental tuning).

OPTIONAL ACCESSORIES:

* SP-23G external speaker with
selectable audio filters.

- VFO-230 external digital VFO
with 20-Hz steps, five
memories, digital display.

* AT-230 antenna tuner/SWR
and power meter/ antenna
switch 160-10 meters,
including three new bands.

* YG-455C (500 Hz) or
YG-455CN (250 Hz) CW
filter for 455 kHz IF.

« YK-B8C (500 Hz) or
YK-8BCN (270 Hz) CW filter
for 8,83 MHz IF.

* KB-1 deluxe heavyweight knol

* (VFOs for TS-830S, TS-5305,
TS-130 Series, and TS-120S
are compatible with all four
series of transceivers,)

® KENWOOD

TPfO-KFNWOOn COMMUNICATIONS

1111 West Walnut, Compton. California 90720

IF shift, digital display, narrow-wide
filter switch

TheTS-530S SSB/CW
transceiver covers 160-10
meters using the latest, most
advanced circuit technology, yet
at an affordable price,

TS-530S FEATURES:

• 160-10 meter, LSBn USB, CW,
afl amateur frequencies,
including new 10P 18, and 24
MHz bands. Receives WWV
on 10 MHz.

Built-in digital display (six
digits, fluorescent tubes) h with
analog dial,

•

MC-50

• IF shift tunes out interfering
signals.

• Narrow/wide filter selector
switch for CW and/or SSB.
Built-in speech processor, for
increased talk power.

• Wide receiver dynamic range,
with greater immunity to
overload.

Two 61468's in final, allows

220W PEP/180 W DC input on

all bands.

Advanced single-conversion

PLL, for better stability,

improved spurious

characteristics.

Adjustable noise-blanker, with

front panel threshold control.

• RIT/XIT front panel control
allows independent fine-tuning
of transmit or receive
frequencies.

OPTIONAL ACCESSORIES:

• SP-230 external speaker with
selectable audio filters.

■ VFO240 remote analog VFO.

• VFO-230 remote digital VFO,

• AT-230 antenna tuner/SWR/
power meter

• MC-50 desk microphone

• KB~1 deluxe VFO knob.

• YK-88C (500 Hz) or
YK-88CN (270 Hz) CW filter

• YK^88SN {1.8 kHz) narrow
SSB filter.

1 '

•

Wr %»i

SP-230

m A

TS-530S

VFO-240

Mwmm — His-"

m m m

AT-230

''Quad Bander"... dual
scan, IF shift FM, SSB

The TS-660 is a unique, alh
mode transceiver designed for
operation on 6, 10, 12, and
15 meters.

TS-660 FEATURES:

• FM, SSB (USB), CW and AM
operation.

• 10 Hz step digital VFO. The
frequency step is determined
by mode of operation.

VFOs, memory,
,CW,AM

• R STEP switch alfows alterna-
tive step size in each mode.

• Dual VFOs built-in.

• 5 channel memory stores fre-
quency and band information.

• Memory scan scans all bands,
skips channels not in use,

• UP/ DOWN push-button fre-
quency control on microphone.

• UP/DOWN bandswitch.

Frequency lock function

switch.

IF SHIFT circuit built-m.

Fluorescent digital display

shows Tx/Rx frequencies.

Squelch circuit for FM, SSB,

CW and AM.

CW semi break-in circuit,

with CW side tone.

10 W RF output on SSB, CW,
FM. 4 W on AM.

Two antenna terminals
provided.

• RIT control, • Noise blanker.

OPTIONAL ACCESSORIES:

• PS-20 power supply.

• SP-120 external speaker.

• MB-100 mobile mounting
bracket.

• YK-88C normal CW, (500 Hz)
filter or YK-88CN narrow
band CW, (270 Hz) filter,

• YK-88A AM (6 kHz) filter.

• VOX-4 speech processor/
VOX unit

KENWOOD

TRIO-KENWOOD COMMUNICATIONS

1111 West Walnut. Comntnn California 90220

I^^BHI^^^^^^^

MB tWBtHT

ffl*

■ 1 1

a a omtsi

*«ju n*eoo

'1S[ow hear this*,,,
digital display, front
speaker, easy tuning

The R-600 is a high
performance, general coverage
communications receiver

:overing 150 kH2 to 30 MHz
in 30 bands, at an affordable

irice. Use of PLL synthesized

sircuttry provides high

iccuracy of frequency with
maximum ease of operation.

R-600 FEATURES:

• 150 KHz to 30 MHz
continuous coverage, AM,
SSB, or CW.

• 30 bands, each 1 MHz wide,

for easier tuning.

• Five digit frequency display.
with 1 KHz resolution.

• 6 kHz IF filter for AM (wide),
and 2.7 kHz filters for SSB,
CW and AM (narrow).

• Up-conversion PLL circuit,

for improved sensitivity,
selectivity, and stability.
Communications type noise
blanker eliminates "pulse-
type" noise.

RF Attenuator allows 20 dB
attenuation of strong signals.
Tone control
Front mounted speaker.
"S" meter, with 1 to 5 SINPO
scale, plus standard scale.
Coaxial, and wire antenna
terminals for 2 MHz to

Digital world clock with
two 24-hour displays.
quartz time base

The HC-10 digital world clock
with dual 24-hour display
shows local time and the time
in 10 preprogrammed ptus two
programmable time zones.

30 MHz. Wire terminals for
150 KHz to 2 MHz

• 100. 120. 220, and 240 VAC.
50/60 Hz. Selector switch on
rear panel

• Optional 13.8 VDC operation,
using DCK-1 cable kit

• Other features include
carrying handle, headphone
jack, and record jack.

OPTIONAL ACCESSORIES:

• DCK-1 DC Cable kit.

• SP-100 External Speaker

R-1000

"Hear there and everywhere?.,
easy tuning, digital display

The R-1000 is an amazingly
easy-lo-operate, high-
performance, communications
receiver, covering 200 kHz to
30 MHz in 30 bands. This PLL
synthesized receiver features a
digital frequency display and
analog dial, plus a quartz
digital clock and timer.

R-1000 FEATURES:

• Covers 200 kHz to 30 MHz
continuously.

30 bands, each 1 MHz wide.
Five-digit frequency display
with 1-kHz resolution and
analog dial with precise gear
dial mechanism,

Built-in 12-hour quartz digital
clock with timer to turn on
radio for scheduled listening
or control a recorder througn
remote terminal.

Step attenuator to prevent
overload.

Three IF filters for optimum
AM. SSB. CW. 12-kHz and
6-kHz (adaptable to 6-kHz
and 2.7-kHz) for AM wide and
narrow, and 2.7-kHz filter for
high-quality SSB (USB and
LSB) and CW reception.

Effective noise blanker.

Terminal for external tape
recorder

Tone control.

Built-in 4-inch speaker.

Dimmer switch to control
intensity of S-meter and other
panel lights and digital display.

» Wire antenna terminals fo;
200 kHz to 2 MHz and 2 MHz
to 30 MHz. Coax terminal for
2 MHz to 30 MHz.

* Voltage selector for 100. 120.
220, and 240 VAC. Also
adaptable to operate on 13.8
VDC with optional DCK-1 kit

OPTIONAL ACCESSORIES:

* SP-100 matching external
speaker.

* HS-6 lightweight, open-air
headphone set

■ HS-5 and HS-4 headphones.

* DCK-1 modification kit for
12-VDC operation.

SP-100

R-1000

HS-S

4 fr

TRIO-KENWOOD COMMUNICATIONS

1111 West Walnut, Compton, California 90220

JIG performance, small size, smaller price!

"he TR-2500 is a compact 2
neter FM handheld transceiver
eaturing an LCD readout, 10
:hannel memory, lithium battery
nemory back-up, memory scan,
programmable automatic band-
scan, Hi/Lo power switch and
juitHn sub-tone encoder.

R-2500 FEATURES:

Extremely compact size and
light weight 66 (2-5/8) W x
168 (6-5/8) H x 40 (1-5/8) D.
mm (inches), 540 g, (1.2 lbs)
with Ni-Cd pack.
LCD digital frequency readout,
with memory channel and
function indication.
Ten channel memory, includes
*M0' memory for non-standard
split frequencies.
Lithium battery memory back-
up, built-in, (estimated 5 year
life) saves memory when
Ni-Cd pack discharged.
Memory scan, stops on busy
channels, skips channels in
which no data is stored
UP/DOWN manual scan in
5 KHz steps.

CONVENIENT TOP CONTROLS

2.5 W or 300 mW RF output.
(HI/LOW power switch.)
Programmable automatic band
scan allows upper and lower
frequency limits and scan
steps of 5 KHz and larger
(5,10.15, 20, 30 KHz... etc)
to be programmed.
Built-in tuneable {with variable
resistor) sub-tone encoder.
Built-in 16 key autopatch

encoder.

Slide-Jock battery pack-
Repeater reverse operation.
Keyboard frequency selection
across full range.
Extended frequency coverage;
143.900 to 148.995 MHz in
5 KHz steps.

I I

• Optional power source, MS-1
mobile or ST-2 AC charger/
power supply allows operation
while charging. (Automatic
drop-in connections.)

• High impact plastic case.

• Battery status indicator.

• Two lock switches for
keyboard and transmit.

STANDARD ACCESSORIES:

• Flexible rubberized antenna
with BNC connector

• 400 mAH heavy-duty Ni-Cd
battery pack.

• AC charger.

OPTIONAL ACCESSORIES:

• ST-2 Base station power
supply and quick charger
(appro*. 1 hr).

• MS-1 13.8 VDC mobile stand/
charger/power supply.

• TU-1 Programmable "DIP
switch" (CTCSS) encoder

• SMC-25 Speaker microphone.

• LH-2 Deluxe top grain
cowhide leather case.

» PB-25 Extra Ni-Cd battery
pack. 400 mAH, heavy-duty.

• BH-2 Belt hook.

• WS-1 Wrist strap.

• EP-1 Earphone.

• RF power amplifier (To be
announced,)

"R-7850

0 W, 15 memories/offset recall, scan,
Tiority, autopatch (DTMF)

enwood's remarkable
R-7850 2-meter FM mobile
ansceiver provides all the
3atures you could desire,
icludfng a powerful 40 watts
utput A 25 watt verston, the
R-7800 is also available
R-7850 FEATURES:

40 watts output, with selectable
high or low power operation
15 multifunction memory
channels, easily selectable
with a rotary control, M1-M13
memorize frequency _
and offset (=600 KHz
or simplex)

M14 memorize transmit
and receive frequencies
independently for non-standard
offset MO priority channel,
with simplex -^600 KHz or
non-standard offset operation

* Internal battery back-up for
memories Requires four AA
Ni-Cd batteries, (not
supplied)

• Extended frequency
coverage. 143900-148 995
MHz m 5 or 10 KHz steps.

• Priority aiert, Beep alerts
operator when signal
appears on priority channel,

• Built-in autopatch encoder
(DTMF) All 12 plus four
additional DTMF signaling
tones (With simultaneous
push of REV switch.)

• Autoscan of memories and
entire band, Scan resumes
automatically.

• Front panel keyboard

• Compact size

Krni*

£»

tm--f

• UP/DOWN manual scan of
entire band and memories,
using UP/DOWN microphone
(supplied)

» Repeater reverse switch

• Separate digital displays for
frequency and memory
channel

• LED S/RF bar meter

• Tone switch
Matching accessories for
fixed station operation:

■ KPS-12 power supply (for

TR-7B50)

• KPS-7 power supply (for
TR-7800)

SP-40

Compact mobile speaker
Only 2-11/16 W x 2-1/2 H x
2-1/8 D (inches)
Handles 3 watts of audio

TRIO-KENWOOD COMMUNICATIONS

1111 West Walnut Compton, California 90220

The TR 7730 is available in two
variations: a 16-key autopatch
UP/DOWN microphone
(M046) version, and a basic
UP/DOWN microphone version.

ENWDOQ ftnFM TRANSCEIVER

L MINI

1 1> t in

StAN HOUJ

OIS

Miniaturized,

5 memories, memory/

band scan

The TR-7730 is a very compact
25 watt, 2-meter FM mobile
transceiver, reasonably priced,

TR-7730 FEATURES:

• Dimensions: 5-3/4 W x 2 H x

7-3/4 D, inches. Weighs

3.3 lbs.

• Extended frequency
coverage, 143,900-148.995
MHz, tn 5 or 10 KHz steps.

• 25 watts RF output power,
with HI/LOW power switch.

• 5 memories for operation in
simplex or repeater modes.

• Memory scan, plus automatic
band scan.

• UP/DOWN manual scan on
microphone (supplied),

• Four digit LED frequency
display.

• S/RF bar meter. LED
indicators for BUSY, ON -AIR,

*'ff*%r

REPEATER offset.

• Tone switch for internal tone
encoder (not Kenwood
supplied).

• Offset switch, ±600 kHz.
Non-standard offset uses
fifth memory.

OPTIONAL ACCESSORIES:

• MC-46 16-key autopatch
UP/DOWN microphone,

• SP-40 compact mobile
speaker.

• KPS-7 fixed station power
suppJy,

TR-8400

Synthesized 70-cm FM
mobile rig

• Covers 440-450 MHz, in

25 KHz steps, with two VFOs,

• Transmit offset switch for

±5 MHz. Non-standard offset
uses fifth memory.

• HI/LOW power switch selects
10 or 1 watt RF output.
Similar to TR-7730 in other
features, including five
memories, memory scan, auto-
matic band scan, UP/DOWN
manual scan, four digit display,
S/RF bar meter, LED indicators,
tone switch, and same optional
accessories.

MC-46 16-key autopatch
UP/DOWN microphone.

"New 2-meter direction''.. compact rig
with FM/SSB/CW, scan, five memories

The TR-9000 combines the
convenience of FM with long
distance SSB and CW. it is
extremely compact . . . perfect
for mobile operation. Matching
accessories are available for
optimum fixed-station operation.

TR-9000 FEATURES;

• FM, USB, LSB, and CW.

• Only 6-11/16 Inches wide,
2-21/32 inches high,
9-7/32 inches deep.

- Two digital VFOs, with select-
abie tuning steps of 100 Hz,
5 kHz, and 10 kHz.

• Digital frequency display Five,
four, or three digits, depending
on selected tuning step,

* Covers 1439000-
148,9999 MHz.

• Band scan . . . automatic busy
stop and free scan.

* SSB/CW search of selectable
9.9-kHz bandwidth segments.

• Five memories . , , four for
simplex or ±600 kHz repeater
offsets and the fifth for a non-
standard offset (memorizes
transmit and receive frequency
independently),

•UP/DOWN microphone (stan-
dard) for manual band scan.

• Noise blanker for SSB and CW.

• RIT {receiver incremental
tuning) for SSB and CW,

• RF gain control.

• CW sidetone,

• Selectable RF power outputs
. . , 10 W (HIJ/1W (LO).

• Mobile mounting bracket with
quick-release levers.

■ LED indicators . . . ON AIR,
BUSY, and VFO.

OPTIONAL ACCESSORIES:

• PS-20 fixed-station power
supply.

• SP-120 fixed-station external
speaker.

• B09 System Base . . . with
power switch, SEND/RECEIVE
switch (for CW). memory-
backup power supply, and
headphone jack.

• MC-46 16-key autopatch
UP/DOWN microphone.

PS-20

TR-9000

eo-9

SP-120

KENWOOD

TRIO-KENWOOD COMMUNICATIONS

1111 West Walnut, Compton, California 90220

TL-922-A

Maximum legal power on 160-15 meters

The TL-922A linear amplifier pro-
vides maximum legal power on
the 160-15 meter Amateur bands.

TL-922A FEATURES:

• 2000 W PEP (SSB)/1000 W
DC (CW. RTTY) input power
on 160, 60. 40, 20; and 15
meters, with 80 W drive,

• Excellent IMD characteristics.
■ Pair of EIMAC 3-5G0Z high-

performance transmitting
tubes.

• Safety protection.

■ Blower with automatic turnoff-
delay circuit.

• Variable threshold level
type ALC.

• Two meters, one indicating
plate current, and the other
indicating grid current, relative
RF output, and high voltage.

SM-220

High-performance

oscilloscope (or
various monitoring
functions

The SM-220 Station Monitor
provides a variety of waveform-
observing capabilities, and an

optional pan display.

A wide selection of optional
accessories is offered for
optimum operating flexibility. In
addition to the optional items
listed with each piece of equip-
ment described in this catalog,
the following accessories are
also available:

PC-1 phone patch with hybrid
circuit and VU meter for null
and audio gain measurements.

DM-B1

Dip meter
performs many RF
measurements

The DIVf-81 dip meter is highly
accurate and features, in addi-
tion to the traditional inductive-
coupling technique, capacitive
coupling for measuring metal-
enclosed coils and toroidal coiis.

DM-81 FEATURES:

• Measuring range of 700 kHz-
250 MHz in seven bands.

• Built-in storage compartment
for all seven coils, capacitive
probe, earphone, and ground
clip lead.

• All solid-state and buitt-in
battery,

• HC-25U and FT-243 sockets
for checking crystals and
marker-generator function.
Amplitude modulation.

• FET for good sensitivity.

• Absorption frequency meter
function.

• Earphone for monitoring
transmitted signals.

• Capacitance probe for
measuring resonant frequen-
cies without removing coif
shields, and also for measuring
resonant frequencies of
toroidal coils.

MC-60 deluxe dual impedance
(50KQ/500Q) desk microphone
with 4-pin connector. Also
available with UP/DOWN switch,
in 6 or 8-pin connector versions.

HS-6 lightweight, open-air
headphone set.

KPS-21 13.8 VDC fixed-station
power supply, 21A intermittant
16A continuous.

KENWOOD

TRIO-KENWOOD COMMUNICATIONS

1111 West Walnut Compton, California 90220

SM-220 FEATURES:

• Monitors transmitted SSB and

CW wavefofrns from 1.8 to
150 MHz.

• Monitors signal waveforms in
receiver's IF stage.

• Functions as high-sensitivity,
wide-frequency-range (up to
10 MHz) oscilloscope.

• Tests linearity of linear amplifi-
ers (provides trapezoid pattern).

» Allows observation of RTTY
tuning points (cross pattern).
Built-in two-rone (1000 Hz and
1575-Hz) generator

• Expandable to pan-display
capability for observing the
number and amplitude of
stations within a switchable
+20 kHz/+100 kHz bandwidth.

OPTIONAL ACCESSORIES;

• BS-8 pan-display module for
TS-180S, TS-530S, TS-83QS,
and TS-620 Series.

• BS-5 pan-display module for
T3-520 Series.

KB-1 deluxe, heavyweight,
aluminum knob for TS-830S,
TS-530S, TS-180S, TS-820S,
and R-820.

RD-20 50Q RF dummy load,
(DC-500 MHz) 50 W intermittant,
20 W continuous.

MC-46 16- key autopatch
UP/DOWN microphone.

OTHER ACCESSORIES:

MC-50 dynamic dual-
impedance (50 kQ/500Q) desk
microphone.

MC-308 (500ft) and MC-35S
(50 kQ) dynamic noise-
canceling hand microphones.

HS-5 deluxe SQ headphone set.
HS-4 8Q headphone set,

NOTE: Prices and specifica-
tions of all Trio-Kenwood
products are subject to
change without prior notice
or obligation.

CQ... ALL AMATEUR RADIO CLUBS
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IDEAS

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submission of new manuscripts

for consideration for

the Fall Book List.

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61D86

66 73 Magazine • December, 1981

WE SHIP WORLDWIDE

WORLD WIDE AMATEUR RADIO SINCE 1950

Your one source for all Radio Equipment!

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AUTHORIZED DISTS, MCKAY 0YMEK FOR
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IN STOCK— NEW ROBOT MODEL #800, BIRD WATTMETER, HY-
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DEALER INQUIRIES INVITED. PHONE IN YOUR ORDEH & BE REIMBURSED.

Amateur Radio Courses Given On Our Premises

"30S Export Orders Shipped Immediately.

t^See List of Advertisers on page t&2

73 Magazine * December, 1981 67

The Ace Portable
Synthesized VHF Receiver

for those times when listening is enough

Karl T. Thurber, jr. WSFX
317 Popia r Drive
Miflbrook AL 36054

The sight of a 2-meter
handie-talkie (HT)
strapped to the belt has
long become a telltale sign
that the wearer is an
amateur radio operator —
whether it be at a hamfest,
on the street in a public
place, or wherever. There's
no question that the per-
sonal two-way portable has

revolutionized amateur ra-
dio with a "go-anywhere"
mobility and convenience
that was unheard of just 8
or 10 years ago.

Nevertheless, there are
times when even the small-
est of amateur HTs are a bit
much to tote around. In
many situations, sporting
an obvious HT marks one as
a nut, freak, or fuzz and can
even set one up for a ripoff .
Frequently, it's not ab-
solutely necessary to be
able to transmit; a small

|4l.000MHz

I5S.QOOMH;

JGk.OOOMHl

1 69. 995 MH I

TYPE -A

TYPE-S

TYPE-C

TYPE-D

TYPE-E

I4I OOOMHl TO I69.999MHJ

Fig. 1.

68 73 Magazine • December, 1981

monitor receiver may do
the trick. What isP in fact,
needed in many situations
is an ultra-small, program-
mable, synthesized monitor
that is truly of pocket-sized
dimensions.

A few years back, the
Henry Radio Co. took a
giant step forward in this
area by marketing a line of
low-cost pocket receivers,
available in several models:
a VHF-high band scanning
radio, a 12-channel non-
scanner, a two-channel
VHF-high monitor/paging
receiver, and a single-chan-
nel UHF receiver. These
four radios, available with
accessory continuous tone-
controlled squelch system
(CTCSS) and two-tone de-
coders, filled a variety of
needs as monitor or pager
receivers for hams, volun-
teer firemen, auxiliary po-
lice, civil defense person-
nel, and the like. The sets,

with sensitivity typically in
the range of 0.8 microvolts
for 20-dB quieting and in-
cluding an internal nicad
pack, were not only shirt-
pocket size, they were
small enough to fit in the
palm of the hand. Their
main drawback, common
to all such fixed-tuned,
crystal-controlled receiv-
ers, was the fact that they
were just that, fixed tuned,
meaning that additional (ex-
pensive) crystals were re-
quired for expanded fre-
quency coverage. For ex-
ample, in the case of a
12-channel VHF receiver,
$60 worth of crystals at $5 a
shot would be required for
full utilization. The same
technical developments in
frequency synthesis that
caused the crystal-con-
trolled HT to go out of
favor have had almost the
same effect on monitor re-
ceivers such as these, as

well as mass-market police
and fire monitor table
radios and scanners of the
type made by Bearcat, Re-
gency, and Radio Shack.

A recently introduced
VHF FM PLL synthesized
monitor, the AR-22, manu-
factured by AOR, Ltd. of
Tokyo and sold in the US by
Ace Communications, Inc ,
of Tustin CA, has effective-
ly harnessed the new
technology and made prac-
tical a wide-range VHF
communications receiver in
a coat- or shirt-pocket
package. The new radio,
which isSW H X 2W W
X 1" D, weighs but 7 A oz.
(200 grams) with the battery
pack installed. The AR-22 is
designed specifically for
applications where people
on the move must reliably
monitor transmitted VHF
signals, even under adverse
conditions. The AOR unit is
capable of covering the
VHF frequency spectrum
from 131.000 MHz to
179.995 MHz and is offered
in five discrete ranges em-
phasizing monitoring re-
quirements of different
radio services including
amateur, police, govern-
ment, marine, railroads,
etc As can be seen from a
look at Fig, 1, the two
receiver configurations of
most interest to amateurs
are Type A, covering
141000 to 149,995 MHz,
and Type B, covering
146 000 to 154.995 MHz.
The maximum frequency
coverage of each set is
listed as 8.995 MHz with lit
tie or no degradation of per-
formance at the band
edges.

Designed for FM recep-
tion, the radios feature PLL
frequency systhesized,
dual -conversion superhet
circuitry with low-noise
CMOS logic to cover the
ft 995 MHz range specified,
in 5-kHz increments.

The direct frequency
readout enables positive

**SeG Ust of Advertisers on page 162

For Serious

Amateu

Only

The HQ2,
Broad ban
Tribander
with no
compromise

You could spend a full day
assembling and erecting
this "highly visible" quad
antenna. But. if you're that
serious about your amateur
hobby, youll be rewarded with
antenna performance that puts
you one step closer to your
dream of an "ideal" installation

The HQ2 is a 2-eiement quad antenna
in a complete kit ready to assemble
designed and tuned by the best
antenna engineers in the industry.
Heavy-duty construction includes taper
swaged aluminum tubing, aluminum
stranded wfreP die formed spreader-to-
boom clamps, cycolac insulators, plus
a universal tillable boom-to-mast
clamp

/if/qafia

*-31§ TFtFX COMMUNICATIONS INC

960C- AUicft Aui 5a

22. r%mmm

BROADBAND- Less than
2;1 SWR across virtually
the entire 10, 15 and 20
meter bands.

DIRECTIONALITY: F/B

and F/S ratios better
than3-elementyagis
and forward gain
comparable to TH3MR3,

SHORT BOOM: Turning
radius- 13% ft (4.1 m).

SINGLE FEEDLINE: One

feed line for all three
bands

SOLID TUNING: USS

susceptible to
surrounding objects and
less critical of height.

Tower shown is
NEW Hy-Qain
HG-37SS

Self-Supporting
Crank-Up Tower

73 Magazine • December, 1981 69

VOLUME CONTKGL-
SOUELCH CONTROL

DIGITAL
SWITCHES

POWEB ON /OFF
AMD *5KHi SUDF
SWITCH

EAfl PHONE JACK

Fig. 2.

FLIP UP AMO PUSH

Fig. 3,

frequency control without
the battery drain intro-
duced by LEDs or LCDs.

The two most significant
digits are factory-pro-
grammed. For example, in
the Type A (2-meter) receiv-
er, the base is 140.000 MHz;
this does not require repro-
gramrning. As indicated in
Fig. 2, the third, fourth, and
fifth digits are individually
controlled and set by the
three-section digital thumb-
switch on the radio's top
panel. The slide switch
allows for 5-kHz reception
increments — this feature
allows the receiver to
monitor the exact transmit-
ted frequency or to be set
for standby at a predeter-
mined frequency. The re-
ceiver is set to the desired
frequency using the ( + ) or
( — ) flip-up push-button
located adjacent to the
digit to be changed — the

Frequency Range
Maximum Frequency
Coverage
Receiving Mode
Receiver System

Usable Sensitivity
Audio Squelch
Sensitivity
Selectivity

Spurious and Image
Attenuation
Frequency Stability

l-f Frequencies
Audio Output Power

Power Consumption

Operating

Temperature Range
Battery

Physical Size

Weight

Frequency Selection

PCB

Housing

'Specifications subject

Technical Data

131.000 MHz to 179.995 MHz

8.995 MHz with no degradation

of performance

Frequency Modulation, 16F3

PLL frequency-synthesized duat-

conversion superheterodyne

0.?uV EIA 12dBSINAD

0,2 uV at threshold squeich,

adjustable

Adjacent channel rejection

±12,5 kHz) greater than 60 dB

Less than 50 dB

Within ± 10 ppm over the operat-
ing temperature range
1st 10J MHz, 2nd 455 kHz
100 mW into M)hm load at 10%
THD

25 mA at receiver squelched
100 mA at 100 mW audio output
power
-10'Cto +60°C

Rechargeable nicad battery
pack,

4,9 volts and 225 mAh
5%"(H) x 2W*m x 1-0"(D> with-
out knobs

7.1 oz. (200 grams) with battery
pack

3 digits of digital push switches
and slide switch
Double-side glass-epoxy printed
circuit board

High impact ABS plastic case
to change without notice.

Fig. 4.

button is simply flipped up
(+ or — ), then pushed
down to set the desired fre-
quency (see Fig. 3).

The receiver's specs are
impressive and are, in fact,
comparable to good ama-
teur HTs. Claimed sensitivi-
ty is 0.2 microvolts EIA for
1 2 dB SINAD, with an audio
squelch sensitivity of 0.2
microvolts. The radios in-
corporate what the manu-
facturer calls "electric
stage tuning" for nearly
9-MHz-wide coverage. As
such, the input and rf stages
of the set are tuned elec-
tronically by variable tun-
ing diodes which are in-
serted into each stage to
obtain maximum sensitivity
as well as maximum selec-
tivity and out-of-band spuri-
ous and image signal rejec-
tion. Adjacent channel re-
jection is spec'd at ±12.5
kHz at 60 dB down, while
spurious and image attenu-
ation is about 50 dB. Fre-
quency stability is excel-
lent, within ±10 ppm (parts
per million) over the operat-
ing temperature range of
— 10 degrees C to +60
degrees C

The physical construc-
tion of the little unit is very
sturdy. The set is designed
and tested to operate under
adverse, knockabout condi-
tions- The high-impact ABS
plastic case housing pro-
tects against physical
shock, while the double-
sided glass-epoxy printed
circuit board ensures a tight
ship inside.

Audio output is suffi-
cient, considering the
physical size and power
limitations imposed, Rated
audio output power is 100
mW into an 8-Ohm load at
10% THD (total harmonic
distortion); power con-
sumption is but 25 mA with
receiver squelched, rising
to 100 mA at the rated 100
mW audio output level. The
internal battery furnished is
a rechargeable 4.9-volt,
225-mAh nicad pack.

For a refreshing change,
there are no accessories
that must be purchased to
achieve acceptable and
convenient operation. In-
cluded are a wall-type
charger for charging the
225-mAh nicad battery
pack, the pack itself, stan-
dard 7" and mini (4") helical
(rubber duck) antennas, a
20" wire lead antenna, and
an earphone. The only op-
tional accessories offered
by the manufacturer are a
leather carrying case and
vehicular charger.

The set's full set of specs
is given in Fig. 4. How did
the little radio perform on
the go?

We selected the "B"
model, which covers
1 46.000 to 1 54.995 MHz, for
purchase. This choice al-
lowed us to cover both the
populous top 2 MHz of 2
meters, plus a 7-MHz chunk
of the adjacent public ser-
vice and commercial bands,
allowing bonus coverage of
local police, fire, highway,
paging, mobile radiotele-
phone, and taxicab fre-
quencies. The radio's bat-
tery was found fully charged
upon receipt (in use it takes
about 10 hours to fully
charge the radio with the
set turned off). The fact that
the battery was charged
allowed us to check out the
radio's performance within
a few minutes of unpacking
it. When used with the stan-
dard-size (7") rubber duck
antenna, we found recep-
tion to be entirely adequate
from medium- to high-level
signal sources, actually
about equivalent to that ex-
pected of the typical ama-
teur HT when using a rub-
ber duck antenna. Recep-
tion on the smaller (4")
mini-duck was, predictably,
not as good, but represent-
ed a good space-saving
compromise when receiv-
ing strong local signals. The
20" wire lead antenna did
not seem to offer any im-
provement in reception
over the larger rubber duck.

70 73 Magazine * December, 1981

Frequencies were easily
and rapidly punched in us-
ing the three digital push
switches and slide switch
(for 5-kHjt split-frequency
operation). The volume and
squelch controls, located
behind the earphone and
antenna jacks, respectively,
on the top of the radio, are
very small and were very
difficult to operate with the
antenna and/or headphone
plugs installed Fortunately,
for most purposes, these
controls can be set and
forgotten except for occa-
sional minor adjustment.
Audio quality was excellent
and was of more than ade-
quate volume for most ap-
plications; there was no
trace of case vibration even
at high audio levels.

Other than the minor in

convenience caused by the
size and placement of the
two top-panel controls
(volume and squelch), no
significant drawbacks were
noted in operation. The syn-
thesized feature was found
to be very handy, for the
same reasons that prac-
tically the only HTs sold to-
day are synthesized mod-
els, All that seems to be
missing is a scan feature,
LED or LCD frequency dis-
play, and a belt clip — all,
perhaps, in the next model,
The one real disappoint-
ment we noted was in the
instructions, which bor-
dered on the unreadable.
Fortunately, the radio's
operation was straight-
forward and didn't require
resorting to the instruc-
tions—usually a last resort,
anyway, to most hams! No
schematic diagram was
supplied.

The little radio fills a real
need for an inexpensive,
frequency-agile portable
monitor receiver; at $150, it
represents a worthwhile in-
vestment. For more infor-
mation, contact Ace Com-
munications, 2832-D Wal-
nut Ave, Tustin CA 92680,
Reader Service number
478 ■

»'S*e Ust of Advertisers ort page 182

18HT

Hy-Tower

The World's Finest
Multiband Vertical

The 18HT Hy-Tower is the only full size,
80 thru 6 meter, automatic band-switching
vertical antenna on the market today.
A unique stub decoupling system effectively
isolates various sections of the antenna
to provide a full quarter wavelength
antenna on 80 and 40 meters, and a
patte rrncom pressing 5/8 wavelength
radiator on 20, 15 and 10 meters. The 24
foot tower section of the antenna, in com-
bination with the decoupling system,
achieves excellent bandwidth

The Hy-TowerT a 'low visibility'1 antenna,
takes less than three sq. ft. (2 8 sq. ml of
real estate and uses top quality materials
and construction. The entire alf-band
system is fed with a single feedline.
Installation and maintenance are simplified
by a unique hinged, tilt-over base.
Excellent performance can be achieved
with a ground system of 6 ground rods at
the base of the antenna. Performance can
be further optimized with the installation of
a buried radial system, 160 meters can
be added to the antenna with the
installation of a base-loading coil and an
additional kit will be available when the new
WARC bands are authorized , adding all
three of these new bands to the Hy-Tower

BEAM PERFORMANCE-A system of two
or three Hy-Towers can be installed as
a phased array, delivering true beam
performance on any two adjacent bands. A
rotafable beam signal on 40 and 75/80
meters! Imagine what that will do for your
transmit and receive signal! We have a
complete engineering technical data report
on phased verticals. Write for your free
copy today,

hygaln

^316 TELEX COMMUNICATIONS, INC

9600 fcldnnh Ave So Minneapolis. MN 55420 USA
Europe 22 rue de la Legion d Hchnneur 933QD St Denis. France

i -x.~.

73 Magazine * December, 1981 71

MICROLOG

►

•SANYO

■•^■'-■^:. ..

We proudly announce our
Amateur Communications Ter-
minal, the AGT-1. It's the best
value in the Amateur Radio
market for your RTTY/CW re-
quirements. Check the combina-
tion of features and proven
MICROLOG quality. You'll agree,
the ACT-1 is a 'Tough ACT to
follow." Microlog Corp. 4 Pro-
fessional Dr. Suite 119, Gaithers-
burg, MD 20760, Tel. 301-948-5307
Telex 908778.

Sales through your local dealer

MICROLOG

INNOVATORS IN DIGITAL COMMUNICATION

• SIMPLE DIRECT CONNECTION to your
Transceiver. • COMPLETE SYSTEM, built-in
Demodulator & AFSK Modulator with key-
board programmable tone pairs from 500 to
3000 Hz. • SPLIT-SCREEN operation with
keyboard selectable line location • 1400
character text buffer. • TEN, 40 CHAR, pro-
grammable message memories, plus ID's
WRU & SELCALs. • RANDOM CODE gener-
ator & hand key input for practice. • Baudot
60 to 132 WPM. • ASCII 110 & 300 baud.

• SYNC-LOCK & NON standard speed ASCII
operation from 10 to 200 baud, (slow speed =
noise immunity). • RECORDER INTERFACE
for "BRAG-TAPE" or recording off-the-air.

• CODE CONVERTED Printer output in
Baudot or ASCII. • SSTV/GRAPHICS transmit.

• FULL 63 KEY Computer grade keyboard.

*9" monitor $199.

electronic mail
aerospace

press
satellite
training aids

CONSIDER THE

matic

Brn'm

maritime

government

emergency/disaster

meteorological

oceanographic

handicapped
civil defe

You know of its reputation in Amateur
Radio. But did you know of its world-
wide uses in commercial/industrial
communications networks? ATR-6800's
are communicating over land-lines, via
satellite, and on HF/VHF radio links all
over the world. They're teaching
Morse Code on military bases around
the country and operating as TELEX &
TWX terminals. We offer engineering
expertise for your particular require-
ment be it Data Encryption, Computer-
ized Training or any special interest
ATR-6800 with 9" video monitor and
one plug-in Applications Module . . .
$2495. Companion MX-80 printer . . .
$699. Contact the "REAL-WORLD"
at MICROLOG CORP. 4 Professional
Drive, Suite 1 19, Gaithersburg, Md.
20760. TEL: (301) 948-5307. TELEX:
908778. You'll be pleasantly surprised.

MICROLOG

INNOVATORS IN DIGITAL COMMUNICATION

v$ee List of Advertisers on page 182

73 Magazine • December, 1981 73

Paul Dmzer Nil t
2 Dawn Road
Norwatk C7 06851

Beginner's Guide to Antennas

not just for Novices

For a number of years I
have been teaching a
ham radio licensing class
on a more or less regular
basis, and as many instruc-
tors have found, the class
itself is only a start.

As the students receive
their licenses, they invari-
ably return with a set of
questions which point out
the difficulty of translating
the knowledge, newly won,
into practical use. The
following conversation has
been repeated dozens of
times and is aimed at the
universal problem of select-
ing and erecting an antenna
for a new ham station.

Question: I just received my
license and got a good buy
on an allband rig. I am out

of money, don't have much
time, and want to get on the
air as quickly as possible.
What antenna and what
bands should I start with?
Answer: Put up a 40meter
dipole This will give you a
chance to make a large
number of contacts, day or
night, weekday or weekend.
In addition, you can load it
up on 1 5 and work DX if the
sunspot cycle is in a favor-
able position. See Fig. 1.

Q« Can I use insulated wire?
A, Sure— as long as you re-
move the insulation at the
point where you connect
the feedline. Also, make
sure that the wire you select
does not stretch. If it does

stretch, vou w«ll have to
keep cutting the wire back
to the proper length period-

ically Your best bet is to
buy copper-coated steel
wire. The copper gives you
good conductivity and the
steel core keeps it from
stretching.

Q, I have a roll of "thin"
coax [RC-58 or RC-59). Can I
use it instead of buying the
more expensive RG-8?
A In the HF ham bands (80
through 10 meters), as long
as you have a fairly short
feedline run, say, 100 feet
or less, you won't notice
any difference.

Q. Gotcha! We learned that
the feedline impedance
should be 70 Ohms for a di-
pole and some of these
coax cables have a 50Ohm
impedance. Can I still use
them?

A. Again, for short runs of
feedline in the HF bands,
there will be no noticeable
difference. The swr might
be a tad higher, but this
won't make any difference
Just one caution on coax:
You can buy some relative-
ly inexpensive coax that
was originally sold to undis-
criminating and unsuspect-
ing CBers. It normally costs
half or 2/3 of the cost of
brand-name coax, and as
you can guess, there is a
good reason for the lower
price. Be suspicious. Cut
away a short section of the
outside insulation and see
how much of the inside in-
sulator is covered by braid.
If there are large spaces and
you can see a good part of
the inside insulation, be
careful You may be invit-

lengthunfeet)-

lit

466

FREQUENCY UK MM J I

i¥

SOLDER

COAT EXPOSED AREA WITH /

"LIQUID ROBBER' GE "SILASTIC11
OR OTHER SEALANT —**

-if-

SOLDER

SOLDER AFTER
CHECKING SWR

COAX FEEDLINE

Fig. 1. For 40 meters at 7 A 25 MHz. L =468/7.125 =65. 6fl; or

* fW

65' 8

RIG

LOW

FUSS

FILTER

COAX JUMPER
AS SHORT AS
POSSIBLE

SWR
BRIDGE

ANTENNA

SELECTION

SWITCH

Fig. 2.

3=C

ANTENNA

TUNER

lUATCHSOX)

TO ANTENNA
#2

74 73 Magazine * December, 1981

ing problems if you decide
to use it

Q. But what about the swr?
Can I operate with a 2:1 or
2.5:1 swr?

A, Well, for many years the
most popular ham antennas
used an swr of 5:1 or 10:1.
These antenna/feed line sys-
tems used open-wire line,
and the key here is low loss-
es in the feed If your rig
will operate with a high swr,
there is no reason to fight to
get the swr down to the nice
round value of 1:1 as long
as the loss in the feedline is
low. Again, in the HF bands
with short feedline runs, an
swr of 3:1 won't affect your
signal at all.

Q. Will my rig operate with
a 3:1 swr?

A. Most rigs with tube finals
will, as long as you don't
keep the key down for long
periods. Solid-state finals

are a different problem.
Most have swr protection,
which means they sample
the swr and reduce their
power if the swr goes too
high. Given a choice, I
would try for an antenna
with a low swr. But if it
means spending 5 minutes
tuning up every time I QSY
(change frequency), I would
accept the higher swr in the
interest of convenience and
extend the life of the finals
by not keeping the key
down so long tuning.

Q, What about antenna tun-
ers? In fact, I have read
about tuners (matchboxes),
low-pass filters, swr bridges,
and coax switches. They are
all connected to the rig. In
what order do you connect
them and why?

A. See Fig. 2. Start at the
coax jack of the rig and con-
nect the low-pass filter with
as short a coax jumper as
possible. This means that
harmonics will be attenu-
ated before they have a
chance to run around long
pieces of coax and possibly
radiate. Next in line is the

swr bridge, since you are in-
terested in matching the rig
to whatever follows The
tuner is the next item, fol-
lowed by the switch and
the antennas themselves.
Thus, you select an antenna
with the switch, utilize the
tuner to make the antenna
and feed look like an ac-
ceptable load, and monitor
the swr (and relative power
out) with the bridge.

Incidentally, it might be
a good idea to make up a
tuning chart for each of the
frequencies you use, Write
down the frequency, set-
tings of the controls on the
rig, settings of antenna tun-
er controls, and antenna se-
lected. When you want to
QSY, simply set all controls
as shown on the chart, and
then tweak them to get
maximum power out and
minimum swr. Normally, if
you operate all over a band,
you don't have to log these
settings any more than each
50 or 100 kHz on 80 and 40,
every 100 or 200 kHz on 20
and 15, and 500 kHz on 10.

Q, I live in a small valley
surrounded by hills. Are
there any special precau-
tions 1 should take in select-
ing an antenna?

A. On 80 and 40, a dipole,
inverted vee, or longwire
will work fine. However, on
20, 15, and 10, you might
not want to pick a very high
gain beam or quad A really
good beam or quad radi-
ates at a low angle, almost
horizontally, and will sim-
ply pump your precious rf
into the hills. Antennas
such as the popular triband
beams have to sacrifice
some of this low-angle char-
acteristic in order to oper-
ate on three bands. As a re-
sult, more of the rf is sent
up at a slightly higher angle
(up to perhaps 40 degrees,
or so) and this will probably
top the hills around you. Al-
ternately, seriously consid-
er tilting the beam or quad
so that it radiates up to
clear the hills.

3, LENGTH {FEEZ-

ES*

SOLDER

FREQUENCY I IN Mm I

ft ADlALS (LENGTH (5 ABOUT 3% LONGER THAN VERTICAL SECTION

241 .

FREQUENCY

OR L*

Fig. 3,

Q> I can't put up a big an-
tenna I don't have the
space or my XYL/husband
or neighbors would object
to a big tower. How about
one of these vertical anten-
nas? See Fig. 3*

A. Verticals, especially full-
size verticals, work fine.
But they do require radials,
Each radial is about a quar-
ter wavelength long, and
while you would like over
100 radials, you should
have as many as you can
put up for each band you
will operate. I suggest 2
each as a minimum on 80
and 40r and 4 each as a min-
imum on 20, 15, and 10.

Q. But I thought verticals
were good where you don't
have much space?

A. They will work with only
the coax feed acting as a
single radial. However, they
work much better when you
add radials cut to the prop-
er length, and they work
best when you have a very
large number of radials. Ev-
ery experienced ham has a
story of how he worked DX
on a 10' wire hanging out
the window, But for the
most consistent and best re-
sults, verticals need radials,
and lots of them.

Q, What about mobile
whips? Can I mount one on
the house and use it? Cars
don't have radials.

J/Bfl OlAMETEir x 21 m LONG
ALUMINUM OH STEEL

1/8-24 TH«EAD (TO HATCH
STANDARD MOBILE
ANTENNA MOUNTING BALL)

I m

Fig, 4.

A. On a car, the metal body
is used as the ground plane
in place of radials. In addi-
tion, this sort of antenna
system is from 2% to 15%
efficient. The physical limi-
tations of a car make us ac-
cept this loss, but you can
do much better at home.

Q. Speaking of cars, I sti
have a standard mobile
mounting ball on my car
that I used to use for my CB
antenna. Can I use it for a
2-meter FM rig?

A. You will have some loss
and you will probably never
get the swr down really low,
but you have two choices
First, you can buy one of
the commercial 2-meter an-
tennas which mount in the
standard mobile ball
thread. These are 5/8 of a
wavelength long but have a
loading coil which makes
them look like 3/4 of a
wavelength. This is an odd
number of quarter wave-
lengths, so the input imped-

73 Magazine * December, 1981 75

—

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ance is about 60 or 70 Ohms
and you can use the old
mount and coax feeder.
You also can take an alumi-
num or steel rod, cut to
about 20 inches, and thread
the lower inch to match the
thread in the ball (Fig 4).
You now have a quarter-
wave vertical again using
the old ball mount and coax
feeder,

Q. As long as we are salvag-
ing CB antennas, surely on
10 meters I can use the
27-MHz Loudengrabber V
that I have mounted on my
roof.

A, You probably can use it
on 10 with an antenna tun-
er, but it might be less effi-
cient than simply replacing
it with a 10-meter vertical.
If you want to try an experi-
ment connect it to your
2-meter FM rig. It might
make a real nice (and quick)
vertical for 2m. But don't
try this unless your 2-meter
rig has swr protection in

case the swr turns out to be
very high,

Q. One final question: I
have a wire which I used to
listen to the ham bands be-
fore I got my license. It runs
out the window, over the
roof, under the apple tree,
and about 10' above the
ground around the garage.
If I use an antenna tuner,
can I make do with this
wire?

A We would all like 90'
towers and large array an-
tennas. Most hams have to
make do with what they
have without structural
steel work. Sure, you can
use the wire, as long as it is
high enough so no one can
touch it while you are trans-
mitting. Generally, you
want any antenna to be as
high and in the clear as pos-
sible. But if you can only
run a short wire, use it. It
will work and you will have
many hours of good con-
tacts. ■

Interested In DX?

Dick Bash says you need THE COMPLETE IDIOTS GUIDE TO

DX (by Stu Gregg, NF4Z) if:

.you think IRC means International Red Cross
. you're still working on your DXCC
.you think WAC means a female army person
.you're not a BIG G UN (yet)
.you think the 'BUREAU' Is where you put your
socks

The Idiot's Guide pulls no punches and doesn't 'snow' you
with nonessentials, but it does unlock some DXers' secrets;
for example: How to QSL, What to say, Where to place your
antenna, How much power to use, Whose awards can you get,
Why and When to use SSB or CW, and much more, < .things
that you need to know, and information that Honor Roll mem-
bers had to learn the hard way-
Dozens of DXers have been interviewed and their suggestions
have been included here. Take a tip from the "Big Guns'" and
use their secrets and tricks.

THE COMPLETE I DIOTS GUIDE TO DX is available at dealers
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76 73 Magazine ■ December, 1981

ICOM

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73 Magazine ■ December, 1981 77

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78 73 Magazine • December, 1981

CABLE TV
UHF UP CONVERTER
$44.95 . . . (Reg. S59.95)

(shipping $3.25)

MICROVERTER VUC 36

Converts Mid and Superband Signals to
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**See Lis\ of Advertisers on page 1S2

73 Magazine • December, 1981 79

• YOU ASKED FOR IT •

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BA READER,
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What does MBA mean? it stands for Morse-Baudot and ASCI I.

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takes cw or tty audio from a receiver or tape recorder and visually

presents it oh the display.

The copy moves from right to left across the screen, much like
the Times Square reader board. Is the AEA model MBA Reader
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baud, The expanded display allows easy copy even during high speed reception.

The AEA model MBA has an exclusive automatic speed tracking feature If you are copying a signal at
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The MBA Reader allows a visual display of your fist and improves your code proficiency. It is compact
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The Reader operates from an external 12 VDC source. This allows for portable/mobile or fixed
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Check the AEA model MBA Reader at your favorite dealer and see all the features in this new
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Prices and specifications subject to change without notice or obligation

80 73 Magazine • December, 1981

HENRY RADIO

...the oldest and still the best

It all began for Henry Radio in 1927. In 1981 we Ye still going strong.

Now, more than ever before, we feel able to provide you with the world's finest and broadest line of amateur radio
equipment. Whether you live in California, across the country or even across an ocean, Henry Radio still provides the
most complete "one stop" shopping center for your radio equipment needs.

The FT-ONE

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A full featured solid state HF
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Let us know how we can help you.

Of course, we stock the full line of
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For all states except California

Calif residents please call collect on our regular numbers

^34

w*S&& Us J of Advertisers on page T65

73 Magazine * December, 1981 81

The Daiwa Infrared
Wireless Microphone

is the mike cable obsolete?

Dave Ingram K4TW}
Eastwood ViUage §1201 South
Route 11, Box 499
Birmmgham At 352W

If you're still fumbling
with microphone cables
that get entangled in auto
steering wheels and gear-
shift levers or continuously
drag papers off the home
station desk, Daiwa Indus-
tries has a new item worthy
of investigation — a cord-
less infrared microphone.
Reflecting shades of both
Star Trek and James Bond,
the infrared mike adds a re-
freshing freedom to '"con-
fined" activities in both
mobile and home setups (al-
though the system is pri-
marily designed for mobile
operation). While this little
gem might be considered
by some to be of question-
able utility, I found it one
of the most logical and
useful items available in
many moons. The only
problem I've encountered
is deciding which rig should
be connected to the infra-
red mike system. Imagine
being able to move around
your home desk or in your
auto while using a small
mike clipped to your shirt
front or pocket, and you'll
surely agree the mobility

of a cordless mike opens
many new possibilities for
enjoyment of your radio
equipment.

How It Works

The Daiwa infrared mike
system is composed of 3
items: the microphone, the
infrared beam sensor, and
the control unit Activating
the microphone's push-to-
talk switches on the mike's
circuitry and the infrared-
emitting LEDs which carry
information to the small
sensor unit Output from
the sensor goes to the pro-
cessor unit, which connects
to the rig's microphone
input

The infrared ray is not di-
rectly visible, indicating op-
eration in the mid- to far-in-
frared range of approxi-
mately 2 to 15 microns (a
micron is one-millionth of a
meter). I suspect the sensor
unit's front cover also acts
as a tuned filter for the spe-
cific infrared range used,
since cigarette light, match
or flame flicker, flashing
LED readouts, etc., are
completely ignored by the
sensor. Some elaborate ray-
modulation tricks may also
be employed, but a sche-
matic diagram wasn't avail-
able for studying the sys-
tem when my early unit was
acquired.

Only three connections
are required for the sys-
tem, and it's ready for use.
First 12 volts dc is ap-
plied to the controller; sec-
ond, the sensor is plugged
into the controller, third,
the controller's output is
plugged into the station's
transceiver The system is
shipped with a 4-pin con-
nector wired for Kenwood
rigs, but it can be quickly re-
wired or replaced as neces-
sary, A drop-in charger for
maintaining the mike's
small internal battery is in-
cluded in the controller
unit's left side, while audio
processing circuitry is

located in the unit's right
side.

The charger's operation
is fully automatic with
a single LED indicating
functions. The LED illumi
nates when the mikes de-
pleted battery is being
charged. The LED begins
flickering approximately
one time per second when
the battery approaches full
charge, and it extinguishes
completely when the bat-
tery reaches full charge.
Since the charger then
switches off, the mike can
be left in its socket until the
next time it's needed This
means that in a mobile in-
stallation, the mike can be
left in the controller's case

overnight for worry-free re-
charging and storage.

The infrared mike's effec-
tive working range is be-
tween 3 and 5 feet, as mea-
sured from LEDs to sensor.
This distance is substantial-
ly more than necessary for
mobile installations, since
the sensor's suggested
mounting place is above
the windshield's indoor
rear-view mirror. Audio
quality of the infrared mike
is extremely good; my unit
actually sounds better than
the factory mikes supplied
with the rigs with which it's
used (Kenwood, Yaesu, and
Comtronix). Each time the
infrared mike's push-to-talk
switch is keyed, a piezo-
electric beeper in the corn
troller chirps softly to indi-
cate proper operation of
the system.

Using the Infrared Mike

Since this "liberated
microphone" doesn't re-
flect the common sensation
of being in direct-wired con-
tact with its associated
transceiver, we suggest ini-
tially using it with the home
setup or a small audio am-
plifier before using it mo-
bile. This will allow you to
become familiar with mike
sensitivity, maximum sen-
sor-to-mike working range,
etc, I used the transmitter

62 73 Magazine • December, 1981

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Send and receive CW with MFJ's new CW transceive pro-
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Enjoy CW. See dealer or call MFJ today,

TRS-80 Models I and 1 CW Transceive pro-
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Tri- Split screen tor receive, transmit, message
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Preload buffer while receiving. Transmit wlren
ready. Ten 199 character memories, Repeat/link
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poorly sent CW. Self adjusting to 100 WPM. Re
turns to receive when transmit butter is empty.
Store up to 5 screens ot received CW.

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1 See List iff Advertisers on page 162

73 Magazine * December, 1981 83

monitor in rny FT-901DM
for this purpose. If your rig
doesn't feature a speech
monitor, mike operation
can be monitored through
the use of a stereo amplifier
or transistor radio (tune
radio off stations, and con-
nect controller's mike out-
put wires between the vol-
ume control wiper and
ground; one "side" of the
volume control is usually
connected to ground also).
My home setup opera-
tion with the infrared mike
was so enjoyable that I
postponed mobile use for a
couple of weeks. The infra-
red sensor was stuck to my
wall-mounted speaker
which was positioned sub-
stantially lower and approx-
imately twice the distance
of Daiwa's suggested top-
of -windshield moulding
strip location. The system
worked great, but the mike
had to be held vertically
and "talked across" be-
cause of the low-mounted

sensor. On-the-air compari-
sons reported the mike
sounds as good or better
than my time-proven Shure
526 or Yaesu mike. Since an
in-shack television reacts
wildly when my 2-kW am-
plifier is going full bore, I
expected problems with the
cordless mike+ Fortunately,
however, I was pleasantly
surprised. The mike per-
formed magnificent-
ly . and I could enjoy the
flexibility of moving any-
where around the operating
desk without the ties of a
mike cable.

Mobiling with the
Infrared Mike

The true pleasures of a
cordless mike operation
were realized when I mated
the unit with my 2-meter
mobile rig. The infrared sen-
sor was placed above the
inside rear-view mirror
while the controller was
mounted with adhesive
pads (supplied} to the trans-

ceiver's bottom I could
move anywhere within the
[full-size 1981) car's interior
and conduct smooth QSOs
in a very enjoyable manner.
Bright sunlight, unusual re-
flections, and temperature
variations had no effect on
the system. The micro-
phone worked as flawlessly
as a wired mike. A slight
amount of wind noise was
noticeable when a window
was open or the air condi-
tioner was operating at
maximum. Loud noises out-
side the auto occasionally
modulated the rig, empha-
sizing the need for Daiwa's
optional F-4 windscreen
Since the system's audio
processing circuitry doesn't
skimp on output level, the
windscreen is definitely
beneficial for mobile
operations.

Summary

The Daiwa infrared mike
system is one of the most
enjoyable accessories I've

used with an SSB or FM
transceiver The unit's ver-
satility and relatively low
cost are particularly attrac-
tive, since it allows one to
enjoy a touch of class with-
out a drastic financial out
lay ($79 95; 4 optional wind-
screens, $7.95). My only
complaint on the whole sys-
tem is the somewhat flimsy
push-to-talk switch on the
mike (it's also a push-
on/push-off, unless you
have a light touch). The
switch hasn't given any
problems, and I'm not con-
sidering modifying it— I'm
merely finicky. I'm quite
impressed with the sincerity
and c red i lability of MCM
Communications, the US
distributor for many Daiwa
products. They seem com-
mitted to caring for their
customers. For more infor-
mation, contact MCM Com-
munications, 858E Congress
Park Drive, Centervilte OH
45459, Reader Service nunv
ber 477 ■

A DIVISION Of INNOVATIVE LABS. INC,

P,0, BOX 139

ARLINGTON. TEXAS 76004-0339

SUPERVERTER I. $99.95

The ultimate in converter technology! Dual-stage selec-
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trolled oscillator We recommend this unit for experi-
enced kit builders. 12v Stationary Power
Supply . . . $24.95 tor Superverter I.

SELECTIVE PREAMP. ......... $44,50

This new unit la not like other wideband preamps. Ex-
perienced kit builders can easily add this unit to our ex-
isting boards or to other manufacturers' boards to Im-
prove overall performance,

2300 MHZ CONVERTER KIT „ iM $35.00

Complete with PC board, parts and 10-page Instruction
book.

VARIABLE POWER SUPPLY $24.95

Complete kit includes all components for working unit,
including deluxe box and overlays.

DISK YAQI ANTENNA. $25.00

Complete kit with PVC and mounting bracket Stronger
than loop yagl, and equal In gain.

4-FOOT DISH ANTENNA $49.95

Overall 25 dB gain. Partial assembly required. Shipped
UPS (ground) only.

DL 2000 SATELLITE RECEIVER $899.95

Fully assembled receiver— this la not a kit

1 20 ° LN A „..„„. ™„ $650.00

TERMS: COD, Money Order, Bank Cards (800) 433-5172 ORDERS ONLY
HOURS: 8:30-4:30 COST; MON-FRI (817) 285-0391 INFORMATION

COMING NEXT MONTH OUR OWN
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Our product may be copied, but the performance is never equalled. p 0 BOv 3qq Arlington

UNIVERSAL COMMUNICATIONS ™ *-*«*

84 73 Magazine * December, 1981

EAST COAST #1 GOES
NATIONAL

THE ANTENNA BANK is
East Coast's #1 supplier of

ANTENNAS — TOWERS

ACCESSORIES

CUSHCRAFT:

A3 New Element T riband Bum

A4 New 4 Element Tnband Beam ....

AV3 New 3 Sand Vertical1 i0~20ro

AV* New 4 Band Vertical I0-40m

AV5 New S Sand Vertical l0-80m

R3 20-\5-Wm Motor Tuned Vertical ....
32-19 19 Element 2m Boomer OK Beam
214B 14 Element 2m Jr Boomer 144-146 . . .

A 147-11 11Element2m . . TT, . . T

ARX2B 2m "Ringo Ranger II ...«

— COMPLETE LINE ON SALE —

MINI QUAD MQ-t S-1Q-15-20m

■ ■ i i

-r 1 I I b

$165 00
S224 00
S 4000
$8100
$67 00
1202 00
$ 74,00
$ 60 00
$ 33 00
% 33 00

$129 00

HY-GAIN:

V2 New 2m Vertical . $ 3350

TH3JR3 Element Triband Beam $133 00

TH3MK3 3 Element Triband Beam ». . $175 00

TMSDX New S Elemern Tnband Beam . . $195.00

TH6DXX 6 Element Triband Beam $235 00

105BA 5 eiemenl 10m "Long John" $ 95 00

1 55BA 5 Element 1 5m Long John" $145.00

205BA 5 Element 20m 'Long John" $235 00

14AVQ 4 Bend Vertical UMOm , , , | 46 00

18AVT 5 Band 10-80m Trap Vertical S 76 00

— COMPLETE LINE ANTENNAS ONLY ON SALE -

ROTORS & CABLES

COE HAM IVC045H

.*.»»*..!

$165 00/94.00

Alliance HD73/U f 00 ..*.♦> , , . $92 00/42 00

RGB/LI Foam 95% Shield 24C/M

RG213 Mil, Spec . „ , 26*/ft.

6 Wire Rotor Cable 16*/lt

Phi I ly St ran Guy Cable j n slock— for price & delivery
information call {703) 569 1200

#1 ROHN TOWER DISTRIBUTOR
SALE:

JOG 10 Tower Section $ 29 50

250 10 Tower Sectton - - $39 50

45G t0' Tower Section ......$ fl7 50

HDBX48Fre« Standing Tower 1320 00

f R254A 4S 25G Fold -over Tower $595 00

{Freight prepaid on Fold-over Towers Prices T0%

higher west ol Rocky Mountains)
vVe Stock Rohn Accessories— for price & delivery
information _ call {703} 559-1200

HUSTLER SPECIAL COMPLETE
LINE:

aBTV' 5BTV 4 or 5 Band Vertical $74 00/92 00

MO-1 MO-2 MF Mobile Mas I S 17 50

HF MOB. RES $TD 4iw SLPf H 2.0**

10 or 1 5m . . . , I 6.00

20m ,.......»,,.,, $11.00

40m $13.00

75m., $14.00 -

SF2 2m 5/6 Whip

HOT ■ Hustleoff Mown!

BM-1 Bumper Mount wilti Ball

$1400
11500

na.oo

$28.00

■ I + * # ■ 1 -f fc * *

s
$

9 00
1400
1300

AVANTI API 51 3G Glass Mounl .

$27 95

W2AUBafun ,

Trape 10, 15 20 Qt 4Qm.

$17 55 List Sale I 13 35
$24 95 List/ Sale $18 79

VAN GORDON:

PD 9010 i0-fl0m Wire Dipoie
PD 4010 I0-40m Wire Dipoie
PD 8040 40 BOm Wire Dipoie
SD 40 40m Short Dipoie
SD §0 80m Short Dipoie . . . .

' > ■ ■ ■ -f b *

HiO Salon.
HiQ Center

» ■ ■ ■

$1095 List Sale
$ 5 95 List Sale

$ 23 B0
$ 2520
S' 26,40
S 21 SO
S 22 80
$ 7 95
_$,, 4 95

ORDERS ONLY (800) 336-8473

ALL OTHER CALLS (7331 569-1 2tD
Shipping coat rvoi mcJuoed— Prices subject to change

ALLOW 2 WEEKS FOR DELIVERY

No COD— We ihtp UPS

We reserve I he right to hmii quant ihes

THE ANTENNA 8ANK
^* 6460 General Green Way

Alexandria. VA 22312
17031569-1200

MFJ DIGI-DIAL ADAPTER

turns your frequency counter into a

DIGITAL FREQ. READOUT

Calibrate control

compensates for heterodyne
errors and mode offset*.

The MFJ DighDial Adapter turns your frequency
counter into an accurate digital frequency readout
lor your transceiver. Connects between external
VF0 jack and frequency counter.

Counter gives direct frequency readout lo right
of decimal for 7, 14, 21, 28 MHz bands. Mentally
replace digits to left of decimal with MHz band
as you do now with your analog diaL For the 3,5
and 28-5 MHz band Ignore digits to left of deci-
rnal and mentally add 3,5 or 28.5 MHz, respec-
tively, to counter reading.

Calibrate for each band and mode <CW. USB.
LSB, AM} to compensate for heterodyne oscillator
errors (does -not read CW transmit offset)

Digital mixer inverts VFO frequency to give
correct frequency readout Normal/Reverse switch
gives direct VFO frequency readout {for some rigs
on some bands, like Drake TR 4).

RF butter amplifier. Crystal reference oscillator.
On/Off switch. "On" LEO. Biackt eggshell while at.
cabinet 3%x1V«3vr. 9-18 VDC or 110 VAC

with optional MFJ 1312 AC adapter. $9,95.

Order MFJ 210 For any rig with 5 5.5 MHz
VFO (TS52Q, 3, SE; TR 3, 4; HUM 00. T01,
S&101, 102; Tritons; etc) Order MFJ 211 for
Yaesu FT 101 series (8.7 to 9-2 MHz VFO).

Order from MFJ and try it - no obligation. If
not delighted, return it within 30 days for refund
(less shipping), One year unconditional Qyarinleii

Order today. Call toll free 800 647 1800 Charge
VISA. MC or mail check, money order for $59 95
plus $4.00 shipping for MFJ-210 or MFJ-211.

Don't wart any longer to enjoy digital readout,
order now. Call MFJ or see dealer.

CALL TOLL FREE . . . 800-647-1800

Call 601-323-5869 for technical information, or-
der/repair status. Also call 601 323 5869 outside
continental USA and in Mississippi. w?

1MB I ENTERPRISES,

IVIl W INCORPORATED
Box 494, Mississippi Stats. MS 39752 J

®1T'S

POBT*BL£ _.o*T*bV-E

H. T.
USERS

ofctf

cow**

IT'S
M2 ENGINEERINGS' NEW

HANDICON V

*T4

°^R

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4T$

*AOlO nor IWCL.

• ANY FULLY SYNTHESIZED 2 METER
KT. CAN NOW BE A COMPLETELY
PORTABLE VHF-hi MONITOR

•2400 CHANNEL CAPABILITY
•DOUBLE BAND COVERAGE.

154 -158 Mhz fire^polic^sheriff,

paging & more
159 - 163 Mh* maritime coastal ,

railroads, NO A
weather & more.
•MULTI-BAND & MULTJ -CHANNELLED

MONITORING WITH SCANNING H T/s
•SINGLE 3*POSiTION CONTROL
•"OFF" RETURNS TO NORMAL TRANS-
CEIVER OPERATION

• LOW LOSS COUPLING TO ANTENNA

• UP TO 6 MOS. OPERATION UNDER AVG

USE WITH A SINGLE AAA CELL

• Bl- LATERAL PROTECTION AGAINST

ACCIDENTAL TRANSMISSION FOR
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• Size - 2.25 x 1.5 x 1.4 inches

• weight fc 4.5 OZS.

$44

||C +S2-50 pstg Ahndlg.
■ **** m Calif, add 6% s.tx.

contact

M SQUARED ENG.
1446 Lansing ave.
San Jose.Cal 95118

-or-
Ph.408-266-9214

*
*
*
«

Please write for club discounts
on quantity orders

Usr of A&vvrtisors on pag* 762

73 Magazine * December, 1981 &5

IT7T

1-800-528-8960

AZDEN

PCS 3000 - $285

APPLE

Apple II-48K -$1179

ATARI

400 -$349 800 -$740

CW RTTY SYSTEMS

RADCOM - Complete with Apple
TU & Software - $259

EGBERT - No TU
Apple Software Decodes &
Displays -$39

GALFO - Requires TU
Apple Software • $29

EPSON

MX80 - $469 MX1 00 - $749

IRL

FSK500 - $229 FSK1 000 - $449

KDK

2025 - $299

LOBO

Apple/TRSSO Drive - $390/$390

MONITORS

APF-$125 Sanyo -$159

MPI

88G - $595 99G - $695

MACROTRONICS

M80-S159 CA650-$259

SANTEC
CALL

OKIDATA

M82A - $499 M83A - $749

ZENITH

219 -$775 289 -$2195
Arizona 1-602-246-1783

EXPOTEK

CORPORATION

22 31R W. Shangri la RcL
Phoenix, AZ 35029 ^3

Building A Transmatch?
Fixing An Antenna?
Making Test Gear?
Constructing A Kit?

KITS

IN STOCK

B & W cods, switches, antennas
Jackson dials and drives
J W Miller parts
Mi lien components
Multronics roller inductors
Toroids. cores deads baluns
Variable capacitors
Cardwell — E F Johnson
Hammarlund — Millen

NEW

Inqpraws UHF O&cittilor |fn 8 fit ,
L-4fefen05T 18* »
Gene?*; Cover jge with r>4fee
*UA B ACfOST 5/BH
» R Sawstiie Swrcti im 6/8O1
Antenna SwrietMOSTfj^fc
Modulate* \Qt ? Meier Synmestfer

Catalog — 25 cents

R-* Nchw Budge (fit ?/ ??l
Spur D3mJ Speech Processor

4Q M«er ORP T'anKe'rtr

Mcroprocessor Contest Keyv
(IV i/8i I

Mflny Crl^ers.

^454

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Box 41 1S, Qraenvlll*, NH 0304*
(603) 176-1033

16K Memory

ALL MERCHANDISE 10O% GUARANTEED

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CALL US FOR VOLUME QUOTES

MA1 01 2A CLOCK MODULE

Complete alarm clock module with special

transformer and spec sheets included.

Just add switches.

8.99 ea. 3/24

8038

INTERSIL

FUNCTION

GENERATOR

3.99 ea 5/17.50

.43" Common Cathode
LED Display

These are first quality RED displays
manufactured by H.P.

#5082-7760 .79ea 100/$65

95H90

350 MHz

ECL

PRESCALER

CHIP

7.99ea 5/35.95

LINEAR

LM301V

,34

LM741V

LM308V

.96

LM747

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LM309K

1.49

LM748V

LM311

LM1310

2.90

LM317T

1.95

MC1330V

1.89

UU317K

3.95

MC1350V

1.29

LM318

149

MC1358

1,79

LM323K

4 95

LM1414

1.59

LM324

.59

LM1458V

LM337K

3.95

LM1488

LM339

LM1489

LM377

2.29

LM1800

2.99

LM380

1.29

LM1889

249

LM386V

150

LMJWUU

LM555V

LM3909V

LM556

LM3914

3.95

LM565

.98

LM3915

3.95

LMS66V

149

LM3916

395

LM567V

129

75451V

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LM733

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CALL TOLL FREE
800-538-5000
800-662-6233

ICALIF RESfOENTSt

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COME VISIT OUR NEW

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AND MUCH MORE

t |UR MHIKODKVICKS. INC.

1224 BASCOM AVE. ^409
SAN JOSE, C A 95128

p 408-247-4852

TERMS. For shipping Include $2 00 to* UPS
Ground S3. 00 for UPS Blue Label Air
$10 00 minimum order. Bay Area Residents
add 61 sQ7: sates tax. Calif Residents add flao
sales tan, We reserve the tight to limit quant
ities and substitute manufacturer Prices
subject to change without notice Send
SASE tor complete list.

86 73 Magazine • December, 1981

OVER 70 BRANDS WLAND-MOBILI
IN STOCK U RADIO

AMATEUR
RADIO

Full Service Shop * Spectrum Analysis •Antennas
New and Used Equipment •CW-SSB-FM, Etc. * Towers
FCC Study Guides •Code Tapes •Books ^Accessories

ICOM

5HORTWAVE

CLOSED
SUNDAYS.
HOLIDAYS

Specialists in Amateur Radio,
Short- Wave Listening
And Contemporary

9 30 8 oo pm ^*€>b^ Electronic Gear.

HOURS

MON.TUES, WED,:
9:3O-6;0O PM

SAT.: 9:30-3:00 PM

■UrMlIM-"

1009 GARFIELD ST, OAK PARK, IL. 60304

SJ1 2)848-6777

Now— the
industry's
first truly

INFO-TECH M-300C
TRI-MODE KEYBOARD

A microprocessor controlled keyboard
that generates: Morse, RTTY. & ASCII

Morse Features:

• 4 to 125 W P.M. in 1 VYRM.
increments

• 9 adjustable weight levels

• relay keying

• srdetone with tone and level
adjustments

• special keys: AS, BK, BT, AR,
3K, CO, DE

RTTY Features:

• 4 speeds

• 2 shifts (170 & 850 hz)

• built in AFSK

• built in CWID

• built in RY generation

ASCII Features:

• 110 A 300 Baud

• 2 shifts [170 A 650 hz)

BesXr;ss45o°°

FO.B. Factory

Other Features:

• Built in quick brown for generator on all modes * CQ & DE special keys on all modes
■ Automatic CR/LF • Keyboard control of ail functions

• 700 Character Running Buffer » 4 row keyboard eliminates figures/letters

• 10 recallable, L.ser programmable message shifting on RTTY
memories of 120 characters each • Many more features.

Order direct or from these dealers:

Cohoon Amateur Supply

307 McLean Avenue
Hopkinsville, Kentucky A22AO
(502) fla&4534

Colmay Products

14903 Beaclwiew Ave.

While Hock, B.C. Canada V4B1N6

(604) 536-3058

IHFOTECH

Gllfer Associates, Inc.

52 Park Avenue

Park Ridge. New Jersey 07666

(20l)39i-7B87

Global Cominur^carions

60S Cocoa Isles Blvd.
Cocoa Beach, Florida 32931
{305) 783-3624

Ham Radio Canter

8342 Qiii/e Bvd

St. Louis. Missouri 63132

1-&m325-3636

ELECTRONIC Michigan Radio

EQUIPMENT! ME. Clemens, Michigan 48045

{313) 469-4656
^35

Dialta Amateur Radio Supply
212 48th Street

Rapid City, Soulh Dakota 57701
(60S) 343* 1 27

Garmantown Amateur Supply

3202 Summe-r Avenue
Memphis, Tennessee 361 T2
1^800-2386168

Manufactured by.

DIGITAL ELECTRONIC SYSTEMS, INC

1633 Wisteria Court • Englewood, Florida 33533 ■ B13W 9518

NAG Distributing

7385 NW 1 2th Street
Miami. Florida 33126
{305) 592-96B5. 763-8170

Radio Woftd

Terminal Building
Oneida Counly Airporl
Oriskany. New York 13424
{315) 736-0470
1-800-448-9335

flay's Amateur Radio

1590 U.S. Highway 19 Soulh
Clearwater. Florida 33516
(813)535-1416

Universal Amateur Radio

1280 AirJa Drive
Reyrtotdsburg, Ohio 43066
(614) 6664267

**See List of Advertisers on page 762

MFJ VLF

CONVERTER

Receive 10-500 KHz on
Ham rig or SWL receiver.

$7095

Plug INs MFJ VLF Converter between your
antenna and Ham transceiver or SWL receiver
and tune the VLF 10 500 KHz band.

Hear weather, ship to share CW traffic, RTTY,
WWVB, navigation beacons, 1750 meter no
license band, European broadcast, and more.

MFJ 332 Ham version converts 10 500 KHz
to 28.010 to 28.500 MHz Also adds standard
broadcast band on 28.5 to 29.7 MHz. MFJ 331
SWL version converts to 4.010 to 4.500 MHz.

Read frequency directly on your receiver
(ignore MHz).

Low noise amplifier, 6 pole lowpass filter,
double balanced mixer, crystal oscillator gives
very sensitive and stable, BCB interference free
signals.

On/off- Bypass switch, LED tor power. 80 239
coax connectors, 3x4xt inches. Black, eggshell
white aluminum cabinet 9 18 VDC or 110 VAC
wrth optional AC adapter, MFJ 1312, $9:95,

VLF/MW/SWL Antenna Tuner

Greatly improves 10KHz to
30 MHz reception.

$CQ95

This MFJ 955 VLF/MW/SWL preselecting
antenna tuner greatly Improves reception of
tOKHz thru 30 MHz signals, especially those
below 2 MHz.

Lets you peak desired signals while rejecting
interference. Reduces overload, background
noise, cross modulation, and intermediation.
VLF signal come roaring in.

Switch between two antennas and two re-
ceivers, Bypass position connects antenna di-
rectly to receiver. 5Vzx2x3 inches. Black, egg-
shelf white aluminum cabinet

$79

MFJ 1020 Tuned indoor Active Antenna,
Can often exceed reception of outside longwire.
Covers 300 KHz to 30 MHz. Has telescoping an
tenna. Minimizes intermod, provides RF selectivi-
ty, reduces noise. Also use as preselector.

Order from MFJ and try it. If not delighted,
return within 30 days for refund {less shipping).

One year unconditional, guarantee,

Enjoy VLF. Order yours today. See dealer or
call MFJ toll free 800-647-1800. Charge VISA,
MC, Or mail check, money order. Add $4 00
each for shipping and handling.

CALL TOLL FHEE . . . 800-647-1800

Call 601 323 5869 for technical information, or
der/repair status. Also call 601-323-5869 out
side continental USA and in Mississippi. ^4?

MEL I ENTERPRISES,

IVIIlJ INCORPORATED

Box 494, Mississippi State, MS 39762

73 Magazine • December, 1981 87

YAESU

450 FM

Chmut

SAVE
$125

VAESU FT 404R 450 MH; HanrJ held Sx cryslar
channels wiihin a 3 MHj (?*) m 5 Mite (r*} spread 430
to 450 MHi 2' W?00m* output With NrCad battery
pack, wall charger, flex antenna, case, strap, earphone
& 446 0 mHi simple*, V = h ■ 2V* ■ ? rtf, ] Id

Regular $299 - Gtoseout$179**

FT-404R TIP same lealures as FT 404R above, plus a
factory installed 16 bunco touchtone pad

Regular $325 - CloseoutS1999S

NCIA 15-hr drop in charger .. Sale $44.95

NC3A DrojHOthRf/JU: adaptor,. Sale 79 95

FBA I Battery sJeew tor NC1A/3A.., 8 00

FflB-1 Extra reCad battery pack 2300

NC-9B Extra 1 5- hr wall charger 10.00

PA-2 Mobile DC DC adaptor & charger 39 00

ll*l*l-l>14

YM-24A Speaker /microphone

FTS 32E 32 tone CTCSS encoder. . . .
FTS-32ED 32 tone CTCSS enc /der

Leather carrying case .,.,

MMB-10 Mobile bracket ...

.3900
4000
. 75 00
,. 35 00
.. 15.00

Crystal Certificates (2 per channel required)
are $5.00 each when purchased WITH FT 404
or FT-404R/TTP Purchased separately they
are $8.00 each (no exceptions).

NEW FT-208R

Synthesized 2m FM HT

SAVE $40

Reg. $359
SALE $319

NC 7 Desk charger.,, $53"

NC8 Quick desk charger S9V-

PA 3 Mob+et- adapter ch|r,..,39°0

FNB2 titra battery. ...4 29*

FBA 2 Bart sleeve NC 7 8 G»
FBA 3 9eeve 208JI/IA/3A. 12*

LCCi Carrying case. 35*

YH-24A Speaker, mic 39*

Quantity Limited. Send Check or Money Order For
prompt shipment, call TOLL FREE 1-800- SSI 0411
and use MASTERCARD or VISA: COD orders OK
Allow J 5" tor UPS shipping charges ■ 48 States.

AMATEUR

ELECTRONIC SUPPLY-

4828 W. Fond du Lac Avenue

Milwaukee. Wisconsin 53216

Phone:(414)442-4200

Wisconsin WATS; 1-800-242-5195

Nationwide WATS: 1 800-558 0411

A £5 BmncH Storw Ik Qearwdief , Ft •

Orlando, FL • Wickirffe. OH • Las Vegas. NV

88 73 Magazine • December, 1981

WORLD TIME
WATCH

the first microprocessor watch
made especially for hams

24 hr. timer

microprocessor
water resistant

solar assist

New Low Price
-$59.95

The HAM-1 functions include local time,
world time, fG.M.T. too) count -up and
count down chronometer, day, month ,
date, alarm and hourly chime. It's ideal
for lew- keeping, DX time conversion and
10 minute 1-0- timing. The HAM-1 fea-
tures a high contrast Seiko display and
solar ceil battery assist. Battery life is
better than 4 years. The HAM -1 is water
resistant to 20 meters, the case is 100%
solid stainless steel and the crystal is
scratch resistant mineral glass. The HAM-
1 is rugged and durable and has a 1 year
warranty.

2 METER AMPLIFIER

• 2 Watts In, 10 Watts Out • V.S.W.R.
Protected *Can be Used for F.M, St S.S.
B. * Led Status Indicators • Low Loss
SO-239 Connectors •Current Drain Less
Than 2. 5 A at 13,6 V.D.C, • Massive
Heatsink • Built In T/R Switch

TEMPO S-1 UPGRADE KITS
$39.95

Upgrade your early Tempo SO to cur-
rent Production Specifications, kits
include: * 450 M.A.H. Battery Pack

• New Case Assembly * All New Es-
cutcheons • SpkrJrVhe. Jack w/Dust
Cap • New Earphone & Jack • P.C.B..
and Pans for Easy Installation • Detailed
Instruction Manual * For Radios With &
Without T,T. Pad,

Other Accessories Available:

Spkr/Mic, Designed for S-1 #s. . . S24J5

Heavy Duly Belt Clip 7,50

Flex Antenna 6,00
To Order Call or Write to:

ADVANCED COMMUNICATIONS

INTERNATIONAL

2411 Lincoln Avenue

Belmont, CA 94002 U.S.A.

(41 SI 595 3949

Add $3.00 per order for shipping &
handling. California residents add 6%
sales tax. Visa, Master Charge accepted.

When it comes to

AMATEUR
RADIO QSL's

it's the

ONLY BOOK!

US or Foreign Listings

1982

NOW READY!

Here they arc* The latest editions. World-
famous Radio Amateur Call books, the
most respected and complete listing of
radio amateurs. Usts callsr license classes ,
address Information. Loaded with special
features such as call changes, prefixes of
the world, standard time charts, world-
wide QSL bureaus, and more. The U.S.
Edition features over 400,000 listings,
with over 70,000 changes from last
year. The Foreign Edition has over
3 70,000 listings, over 60,000 changes.
Place your order for the new 1982 Radio
Amateur Call books, available now.

Each Shipping Tola I

D USCaHbook

D Foreign
Calibook

$18,95 $3.05 $22.00
$17.95 $3.05 $21.00

Order both books at the same time for
$39.95 Including shipping.

Order from your deaJer or directly from
the publisher. All direct orders add shipping
charge. Foreign residents add $4.55 for
shipping. Illinois residents add 5% sales tax.

SPECIAL LIMITED OFFER!

Amateur Radio

Emblem Patch

only S 2. 50 postpaid

Pegasus on blue field, red lettering. 3" wide
x 3" high. Great on Jackets and caps.

ORDER TODAY!

RADIO AMATEUR

lltook

k* ....... + + r.

Dept. B

925 Sherwood Drive

Lake Bluff, IL 60044. USA

*^6i

--448

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OX OSCILLATOR

Crystal controlled transistor type, 3 to 20 MHz, OX-Lo, Cat. No.

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MXX-1 TRANSISTOR RF MIXER

A single tuned circuit intended for signal conversion in the 3 to 1 70

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0F-1 OSCILLATOR

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PAX-1 TRANSISTOR RF POWER AMP

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SAX-1 TRANSISTOR RF AMP

A small signal amplifier to drive the MXX-1 Mixer, Single tuned
input and link output. 3 to 20 MHz, Lo Kit, Cat. No. 0351 2, 20 to
170 MHz, Hi Kit, Cat. No. 035103.

Specify when ordering. $7.02 ea.

BAX-1 BROADBAND AMP

General purpose amplifier which may be used as a tuned or
untuned unit in RF and audio applications. 20 Hz to 1 50 MHz

with 6 to 30 db gain. Cat, No, 0351 07.

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.02% Calibration Tolerance

EXPERIMENTER CRYSTALS (HC 6/U Holder)

Cat. No, Specifications

031080 '3 to 20 MHz — For use in OX OSC Lo 56.88 ea.

031 081 *20 to 60 MHz — For use in OX OSC Hi $6.88 ea,

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'Specify when ordering

Shipping and postage (inside U.S., Canada and Mexico only) will
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^36

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Call 601-323-5869 for technical information, or
der/repair status. Also call 601 323-5869 out-
side continental USA and in Mississippi. ^4?

1MB? I ENTERPRISES,

IVIr W INCORPORATED

^ Box 494T Mississippi State, MS 39762^/

^ See us I of ACveHtsers on page 162

73 Magazine • December, 1961 89

PaufL. RmatdoW4RI
1524 Spnngvafe Avenue
McLean V* 22101

Robert E. Brunmga W 84 A PR
USS Blueridge fLCG7 9)
FRO San FranchCQ CA 96625

What's It All About, ASCII?

RTTY technology update

Authors1 note: Since this article was prepared in early 1980, our experience has been that most stations that have computers also have
dual-made originate/answer modems and do not require the modem translator at the repeater. They transmit with their modem In the
Answer mode and switch to Originate for receiving. This makes all data on both the input a nd output appear at the 2025/2225* Hz tone pair
which Is suitable for simplex operation. Also, since the 300-baud speed of the 103 modems is no better than we can do over the phone, our
current activity is the collection of Bell 202 compatible modems that operate at up to 1200 baud. These modems are becoming available
on the surplus market and require no modification for operating half duplex over the radio. They were chosen because they use the same
familiar FSK as both the 103 and RTTY modulators but at a 1200/2200-Hz rate.

On March 17, 1980, the
Federal Communica-
tions Commission (FCC) per-
mitted the use of the
American Standard Code
for Information Inter-
change (ASCII) in the
Amateur Radio Service

Specifically, the FCC per-
mitted US radio amateurs
to transmit:

• ASCII as defined in the
United States of America
Standards Institute (ANSI)
Standard X3. 4-1 968.

• Speeds up to 300 baud
between 3,5 and 21 .25 MHz
using F1 emission,

• Speeds up to 1200 baud
between 28 and 225 MHz
using F1P F2f and A2 emis-
sion.

• Speeds up to 19,600 baud

on frequencies above 420
MHz using F1, F2, and A2
emission.

The above permission
was contained in the FCC's
Third Report and Order
under Docket No 20777. It
represents a significant step
forward and marks the be-
ginning of a new era of data
communications on the
ham bands. Possibly, it will
play a part in a marriage of
personal computing and
amateur radio. It is not as
permissive as some had
hoped for in order to be
able to experiment with
speeds higher than those
permitted and to transmit
other codes, including
some not yet devised We
look forward to additional

flCCEivcn

fcs

REPEATER
TRANSMUTE*

ANSWER
RECEIVER

AN $ wen
TRANSMITTER

LTA LOOP AHOUN1

}

Fig. T« Addition of an answer modem at the repeater with
its received data echoed to its transmitter allows multiple
users to send and receive data using only originate
modems at their stations,

90 73 Magazine ■ December, 1981

action by the FCC along
these lines to liberalize the
rules on digital transmis-
sions in order to permit true
experimentation in the
Amateur Radio Service,

Outside the United
States, the use of radio tele-
printer codes other than
Baudot (otherwise known
as the Murray code or the
International Telegraph Al-
phabet No. 2) varies from
one country to another.
Many have no regulatory
mandate for the use of the
Baudot code in the first
place. Amateurs in other
countries with import or
monetary restrictions may
have difficulty obtaining
modern equipment employ-
ing ASCII In Great Britain.
amateurs can use any radio-
teletype (RTTY) code de-
fined by documents of the
international Radio Consul-
tative Committee (CCIR),
according to a Home Office
interpretation obtained by
the Radio Society of Great
Britain.

In September, 1978, Ca-
nadian amateurs were giv-
en permission to transmit
computer data in packet
form on frequencies above
144 MHz under a new class
of license called the
Amateur Digital Radio

Operator's Certificate Ca-
nadians have subbands
221,0 to 223.0 and 433.0 to
434 0 MHz reserved exclu-
sively for packet transmis-
sions.1- 2> *> *

While ASCII was origi-
nated in the United States,
it is well on its way toward
becoming the world stan-
dard computer and RTTY
code. It also is known as In-
ternational Standard 646 —
ISO code (Reference 2)—
and International Tele-
graph Alphabet No. 5. Like
the Morse code, variations
of ASCII exist for the alpha-
bets of other languages in-
cluding Cyrillic, Kata Kana,
Arabic, Hebrew, Creek, and
special letters used in Scan-
dinavian languages.5 As in
the US, it is a sure bet that
radio amateurs in other
countries will be among the
first to use personal com-
puters. Many industrialized
countries have home com-
puter stores. So, it is only a
matter of time before
everything falls into place
for the marriage of amateur
radio and computers on a
worldwide basis,

As soon as ASCI I became
"legal" in the US, a number
of amateurs went on the air
to try out the new mode. In
the Washington DC area.

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INTRODUCING THE

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Charge VISA, MC. Or mail check, money order.
Add $4.00 each for shipping and handling.

CALL TOLL FREE . . . 800-647-1800

Call 601 323-5869 for technical information, or-
der/repair status. Also caJt 601-323-5669 out
Side continental USA and in Mississippi ^ 4?

lUIC I ENTERPRISES,

IVII «J INCORPORATED

Box 494, Mississippi State. MS 39762

73 Magazine • December. 1981 91

most radio amateurs in-
volved with computers had
equipped themselves with
modems (modulator-de-
modulators) for communi-
cation on the phone lines.
Baudot operation on 2
meters had been dead for
about a year in anticipation
of the FCCs ruling. Eigh-
teen stations were ready to
go during the first hour that
ASCII was allowed; 14 sta-
tions made successful two-
way ASCII contacts. We
have heard scattered re-
ports of 2~meter ASCII ac-
tivity from other areas of
the country. On the high-
frequency {HF) bands, a
number of stations were on
the air using 110-baud
ASCII on the RTTY frequen-
cies. Many amateurs who
wanted to get on ASCII as
soon as possible did not
want to reconfigure their
stations until the details of
the FCC ruling were known
We hope to see them on the
air soon.

Technical Standards

Comments on Docket
20777 on file in the FCC
public reading room in-
dicated that the writers
favored three basic ap-
proaches, divided almost
equally. About a third said
the bandwidth should be
limited. Another third sug-
gested that speed be
regulated. The remaining
third took the FCC to task
for trying to regulate some-
thing best left to self-
policing amateurs. The FCC
decided to regulate speed.
On other particulars, the re-
spondents suggest that the
FCC forget about specifying
the parity bit because home
computers tend to ignore it.
They recommended mak-
ing both synchronous and
asynchronous transmission
legal to permit experimen-
tation. Finally, they recom-
mended that the bit order
be from the least to most
significant bit according to
common practice

You will note that there
are no restrictions imposed

by the FCC on use of the
parity bit, the number of
stop bits, the use of syn-
chronous or asynchronous
transmission, the bit order,
the maximum frequency
shift for F1 emission, or the
modulating tones for F2 or
A2 emissions. These mat-
ters are open to experimen-
tation and will evolve ac-
cording to the needs and
preferences of amateurs.

For starters, most ama-
teurs wilt completely ignore
the parity bit. In many
cases, stations will transmit
a parity bit, but the receiv-
ing stations will not process
it. However, some agree-
ment on the use of the pari-
ty bit is desirable because
this feature can help reduce
transmission errors The
number of stop bits will
I ikely be 2 for 1 1 0 baud and
1 for 300 baud and up Two
stop bits are needed by a
number of ASCII printers
which operate at 110 baud

Most amateurs will use
asynchronous transmission
to begin with because of
the availability of asyn-
chronous equipment. Syn-
chronous ASCII transmit
sion is an interesting area
for amateur experimenta-
tion, The bit order is likely
to remain least significant
bit to most significant bit
Frequency shifts and
modem tones for amateur
ASCII transmissions are
unlikely to settle down for
quite some time. Amateurs
presently are using modems
of the type used for Baudot
RTTY and those designed
for telephone line com-
munications between com-
puters.

On the phone lines, the
data communications con-
vention for personal com-
puters is to use a modem
which uses Bell Telephone
103/113 standards. This per-
mits serial, asynchronous,
full-duplex communication
at speeds up to 300 baud on
the telephone line. It uses
audio frequency shift key-
ing (AFSK) FM with frequen-
cy assignments as shown in

-I2v

FROM

WEPEATER

RECEIVER

MOOCU RECEIVE*

CARRIER
DETECT

yODCU TRANSMITTER

TONE
ENABLE

- T*D

53*

Mm*

*J!5^F^

p REPEATER
TRANSMITTER

t£K

I2v

Fig. 2. An RC combination with an emitter-follower slows
down the carrier-detect signal from the receiver so that at
least 4 seconds of carrier are required before the modem

transmitter is activated.

Table 1.

Bell 103/113-compatible
modems are available for
personal computers in sev-
eral different forms. One is
the originate-only modem,
the cheapest type, which is
all one needs to originate
calls to other computers.
Originate-only modems use
the "Originating End" tones
given in Table 1 Another is
the answer-only modem for
computers which never
make outgoing calls, The
third variety is the origi-
nate/answer modem which
can handle calls either way.

Separate for the moment
the modem function from
that of coupling to the tele-
phone lines. The least ex-
pensive route is to use an
acoustical coupler which
mechanically connects to
the telephone handset
Home-brew acoustical
couplers can be made from
small transistor radio
speakers and spray-can
plastic caps A direct con-
nection to the telephone
lines can be made by means
of an FCC-approved tele-
phone data coupler, which
is considered a must for
modems with answering
capabilities.

These modems and data
couplers are now readily
available to home comput-
erists and will, no doubt,

have an impact on the stan-
dards to be employed by ra-
dio amateurs The extent to
which this will replace exist-
ing amateur radio FSK key-
ers and converters or tuning
units (let's just call them
modems) deserves some
thought.

HF ASCII RTTV

It seems likely for two
reasons that there will be a
mixture of ASCII and
Baudot on the HF bands for
a while, using existing RTTY
modems One is that some
of the non-US amateur
RTTYers find it difficult to
obtain ASCII gear initially.
Another is that the average
HF RTTYer has hundreds of
dollars invested m a good
modem designed to copy
through the noise, in-
terference, and fading en
countered on HF HF RTTY
modems are far better in
this respect than most Bell
103/1 1 3 modem designs. So.
it would be a step backward
to ditch a well-engineered
HF RTTY modem in favor of
one designed for use on the
telephone line Never-
theless, some 103/113-type
modem operation on the
HF bands is to be expected,
and the 200*Hz shift
employed might not be too
difficult to live with

RTTY modems such as

Function Originating End Answering End
Transmit 1070-Hz space 2025-Hz space
1 270-Hz mark 2225-Hz mark

Receive 202 5- Hz space 1070-Hz space
2225-Hz mark 127f>Hz mark

Table 1 Bell 103/113 modem frequencies.

92 73 Magazine * December, 1981

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r*]

ACOUSTfCALLY
COUPLE JQ
ORIGINATE
RECEIVER

-VJV-

COUPLE TO

OR t Gm ATE

HECE.IVES

F/g, 3. A 555 oscillator at 2225 Hz can be used to fool an
originate modem into thinking it is connected to an answer
modem so that it will enable its transmit tones while
operating half duplex. This is not required if a minor
change inside your originate modem can be tolerated.

the ST-6 can be modified
easily to handle both ex-
isting RTTY tones of
2125Hz mark and 2295-H2
space and 103/113 tones by
retuning audio filters. Clear*
ly, a contest of wills and
pocketbooks is in the offing
before this incompatibility
is resolved. Our feeling is
that the old 170-Hz shift
should be kept for those
stations still running
60-wpm Baudot and that
20OHz shift will be used for
11Q~ and 300-baud ASCII.

ASCII RTTY via OSCAR
Satellites

OSCAR satellites present
a special problem for
RTTYers for either ASCII or
Baudot. The managers of
the satellites do not like any
type of FM (such as FSK) to
be used because the signal
has a 100% duty cycle.
They prefer lower duty-
cycle signals that are keyed
on and off in order to keep
overall loading on the
satellite within reasonable
levels. Thus, any RTTY
modem for communica-
tions via OSCAR satellites
should be capable of on/off
keying. Because of noise
characteristics, for equal
results a good on/off-keying
RTTY demodulator needs
to be a bit more sophisti-
cated than its FSK counter-
part. For the 1980s, an
on/off keying capability
will be a must for RTTY
modems-

VHF/UHF ASCII RTTY

In contrast to HF and

OSCAR RTTY, we expect to
see ASCII with Bell 103/113
tones dominate VHF/UHF
RTTY. This seems fairly cer-
tain because of the decline
in Baudot RTTY activity on
the VHF/UHF bands in re-
cent months

As noted earlier, the
cheapest way of com-
municating with a com-
puter is to use an originate
modem Manufacturers'
surplus originate modems
are available for as little as
$25 This works fine if the
originating station connects
with another station which
has an answer modem. An-
other look at Table 1 will
convince you that two
originate modems cannot
talk to each other. The
same ts true of two answer
modems Those with origi-
nate/answer modems can
talk to anyone; indeed, this
is the case with many com-
puter owners.

Modem Translator
Experiments

A scheme was needed to
make two originate mo-
dems compatible The solu-
tion: placing a modem
translator at the WD4I WC/R
2-meter repeater which
serves the Washington DC
area RTTYers and amateur
radio computer enthusiasts
lust as the repeater oper-
ates on two radio frequen-
cies to translate incoming
signals to the correct out-
put frequency, the transla-
tor modem changes incom-
ing audio tones from origi-
nate modems into answer

modem tones on the re-
peater output. As a result,
all originate modems listen-
ing to the repeater output
are able to copy all signals.
The advantages of this
scheme are:

• Uses exactly the same
modems as used over tele-
phone lines,

• Requires no special,
unique hardware,

• Eliminates the need for
the more expensive answer
modems at all stations.

• Regenerates data at the
repeater, realizing some im-
provement in signal-to-
noise ratio

• Does away with the prob-
lem of who is originating
and who is answering,
which normally is needed in
duplex modems

Implementation ; H a rd-
ware installation was fairly
simple. An answer modem
initially was connected as
shown in Fig 1 The lines re-
quired to the repeater were
an audio tap off the receiv-
er and a tap into the trans-
mitter audio line. The re-
ceived data line coming out
of the modem receiver was
then echoed back into the
modem transmitter so that
an exact replication of all
data present on the repeat-
er input was reproduced on
the repeater output,

The only other signal re-
quired is ar^ enable signal to
tell the modem when to ini-
tiate its transmit tones, This
was done in the initial in-
stallation by simply taking
the received data carrier-de-
tect line, delaying it up to
five seconds with an emit-
ter-follower and a capaci-
tor, and using that to drive
the transmit enable line of
the modem transmitter
With the resetting diode
shown in the circuit of Fig.
24 any momentary loss of
carrier would reinitialize
the five-second turn-on
delay, thereby preventing
the transmit tones from
coming up on anything but
a valid signal The controls
as described above make

the modem an autonomous
device requiring nothing
but power and the two
audio connections.

Controls. Later, addi-
tional control circuitry was
added to disable the func-
tion entirely. This is needed
during periods of experi-
mentation with other types
of modulation on the
repeater and to aid repeater
troubleshooting. A final
refinement was to use the
data carrier detect to open
up the repeater audio line
between the receiver and
transmitter. This ensures
that noise on the signal
received at the repeater is
not added to the transmit-
ter output

installation: To minimize
repeater maintenance prob-
lems, the answer modem
described here was pack-
aged in modular form. A
separate ac power supply
was included in the mod-
ule.

One Hitch: There is a
minor problem with the
scheme described here due
to the manner in which
commercial originate mo-
dems operate, Many origi-
nate modems wait for the
receipt of the answer car-
rier before the originate-
transmit tones are enabled.
This is done by sampling
the receive carrier-detect
line in the originate modem
and looping it back to the
originate-transmit enable.
This feature poses no prob-
lem for a station while
receiving because it will
hear the answer tones being
transmitted by the repeater.
But on transmit since the
receiver is most likely
disabled, the originate mo-
dem will not hear the
answer tones. Fortunately,
this is a wiring change only
for those individuals who
are using surplus or home-
brewed gear. They can wire
the modem-transmit tones
to come on only when the
radio transmitter is keyed
on. For the casual user who
has a nice expensive com-

94 73 Magazine * December, 1981

mercial modem that should
not be attacked with the
soldering iron, there is
another way to coax a mo-
dem into originating tones
first A simple switch in-
serted into the carrier-
detect line to enable or
disable this function is a
solution. Another one is to
use a 555 timer in an oscilla-
tor circuit to generate
2225-Hz tones to foo! the
modem into thinking it is on
line. These tones may either
be hard-wired or acoustical-
ly coupled into the modern
during transmit to enable
the originate transmitter. A
possible circuit is shown in
Fig. 3 and can be construct-
ed for less than $2.

Conclusions

FCC approval of ASCII
will be a boon to amateur
radioteletype activity, espe-
cially on the VHF/UHF
bands. It should help not
only to get back some
RTTYers who drifted off to

play with computers, but
also to stimulate some
computerists to become
hams.

The repeater modem
translator described above
has been in place since
March, 1979. It is an inex-
pensive way to permit use
of existing originate-only
modems. ■

References

1. Robert T. Rouleau VE2PY,
'The Packet Radio Revolution —
Pioneers, Take Note!", 73, De-
cember. 1978.

2. Ron Hesler VE1SH, "DOC
Creates New Amateur License
Class/' GST, December, 1978.

3. Ken Smith VE3HQB and Glen
Simpson VE3DSP, "Packet
Radio (Using a 1802)/' AMRAD
Newsletter, June, 1979. (From
IPSO FACTO newsletter of the
Association of Computer Ex-
perimenters,)

4. Ian Hodgson VE2BEN, "An
Introduction to Packet Raglio,"
Ham Radio, June, 1979.

5. R. W. Bremer, "Inside ASCII,"
Interface Age, May, June, and
JulyT 1978.

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Easy to assemble and install, this kit offers options not
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^307

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**See List of Advertisers on page 162

73 Magazine ■ December, 1981 95

Louis A< Smith U N3BAH
RD #6, Box 479
LatrobePA 15650

The Radio Shack
Pro-2002 Scanner

a look at the Shack's latest

When any manufac-
turer bills a new rig
as the "ultimate scanner/'
naturally I'm skeptical, I've
seen several of the new syn-
thesized receivers which
are promoted as being ca-
pable of receiving every-
thing under the sun. They're
usually rehashed versions
of the lower-priced rf pack-
ages with some gingerbread
knobs and switches added
for color. These units are
almost invariably full of
bugs and prone to breaking
down about one week after
the warranty expires, so
when Radio Shack an-
nounced the introduction
of their new microproces-
sor-based scanner, I viewed
it with anxious, but cau-
tious, optimism.

The Realistic Pro-2002 is
Radio Shack's latest addi-
tion to its line of scanners
and is a replacement of the
Pro-2001. It is cosmetically
similar to its predecessor,
being housed in the same-
dimension case, but this is

where the similarity ends.
The 2002 is a totally new
concept for Realistic and
contains several features
unique in scanner technolo-
gy. The rig is microproces-
sor-based and all functions
are accessed via the 30-key
front-panel keyboard. It
covers the 30-50 MHz VHF-
low, 108-136 MHz aircraft,
138-174 MHz VHF-high, and
410-512 MHz UHF bands.
Fifty channels may be
stored in five banks of 10
each, as well as five search
ranges, with individual de-
lay, lockout, and priori-
ty options. Volume and
squelch rotary controls are
large and conveniently lo-
cated. Logging indicators
are provided for easy return
to a desired setting. A
12-hour digital clock with
am/pm indicator is becom-
ing a standard feature in
programmable units and is
present on the 2002. Other
useful functions are select-
able scan/search speeds, di-
rectional search, scan and
manual controls, external

speaker, antenna, and tape-
out jacks. A 1 20A/-ac cord is
built in and a jack for 12 V
dc is provided along with
cables and mobile mount-
ing bracket.

Due to the complexity
and uniqueness of the Pro-
2002, I will attempt to cov-
er its features and func-
tions individually rather
than collectively.

Frequency Coverage

The 2002 has one of the

most enviable frequency
repertoires in the scanner
industry. Bands covered are
30-50 MHz in 5-kHz incre-
ments, 108-136 MHz in 25-
kHz increments, 138-174
MHz in 5-kHz increments,
and 410-512 MHz in 12,5-
kHz increments. That's a
total of 4000 low-band,
1120 aircraft, 7200 high-
band, and 8160 UHF chan-
nels, or 20,480 discrete fre-
quencies! Notice that
among these bands are in-
cluded 138-144 and 410-420
MHz ranges, used by the US

Government, which cannot
be directly received by any
other commercially avail-
able searching synthesized
scanner.

Searching/Scanning
Functions

A maximum of 50 chan-
nels may be programmed
into the memory of the
scanner. Channels are pro-
grammed into the unit via
the 30-key color-coded
front-panel keyboard and
are stored in banks of 10
channels. These banks may
be selectively scanned or
locked out during scanner
operation by using the ap-
propriate bank- select
key(s). Banks are labeled 10,
20, 30, 40, and 50. For exam-
ple, bank 30 would contain
channels numbered 31
through 40, In addition to
storing channels to be
scanned, these bank-select
keys also perform double-
duty as keys for selecting
search ranges. Up to five
ranges may be programmed
into positions S1 through S5,

96 73 Magazine * December, 1981

Both the speed and direc-
tion of the searching may
be controlled. To initiate a
search, the user enters the
lower and upper search
limits of the desired range
and selects either the up-
ward or downward direc-
tion. Direction may be
changed at any time during
the search. Search speeds
of 3 or 8 channels/second
may be selected by using a
toggle-action push-button
control* Once programmed,
search ranges remain mem-
orized even when the unit is
turned off or unplugged,
provided the 9-V-dc backup
battery is installed. Ranges
may be selected or locked
out using the bank/search-
select keys. If two or more
search ranges are pro
grammed and locked in, the
microprocessor will search
through all ranges sequen-
tially. For example, if range
SI is programmed to search
154-158 MHz and range S2
is programmed to search
453-456 MHz, the unit will
begin to search at 453 MHz
after it has finished 154-158
MHz, If any other ranges
are programmed and locked
in, the searching will con-
tinue through these other
ranges. Upon searching the
last range in the sequence,
the unit will repeat the
search beginning at the first
range. If only one of the
five ranges is programmed,
searching will repeat over
this range only.

Scanning is controlled by
using keys labeled scan,
manual, delay, priority, and
lockout Manual channel
selection may be achieved
by either stepping through
the channels with the
manual key or by selecting
a particular channel with
the digital keyboard.

Lockout serves to elimi-
nate a particular channel or
channels from the scanning
repertoire. Delay is used to
add a three-second delay
onto selected channels
after a transmission is
received and prior to the
resumption of scanning.

The priority key is used to
assign priority status to one
of the scanner's 50 chan-
nels When a channel has
been given priority, this fre-
quency is sampled once
every three seconds, for a
period of 100 milliseconds,
regardless of other scanner
activity. If a signal is re-
ceived during the priority
sampling, the receiver im-
mediately switches to this
frequency for the duration
of the message.

The scan rate is select-
able at either 3 or 6 chan-
nels/second. For a rig with
up to 50 channels to sam-
ple, this is too slow Ideally,
the rates should be select-
able at either 1 5 or 20 chan-
nels/second. With the ex-
isting scan rate, however,
I've found it to be practical
to scan no more than 20
channels (two banks] at one
time.

Miscellaneous Features

The digital readout dis-
play is comprised of seven-
segment green LEDs and
provides information con-
cerning whether the unit is
in the scan, manual , search,
or program mode, if a chan-
nel is programmed with a
delay or lockout, if the unit
is in the priority mode, and
which is the priority chan-
nel. Also indicated are
which channel/search
banks are active or locked
out, channel numbers, and
a seven-digit frequency
readout.

The frequency display
also doubles as the readout
for the digital clock, in-
dicating hours, minutes,
and seconds. The clock,
which operates in the
1 2-hour mode, requires con-
tinuous ac or dc current to
operate. Should power be
interrupted or cut off, the
display continuously flash-
es "E00.00.00" until repro-
grammed with the correct
time. The clock cannot be
programmed to automati-
cally turn the scanner on or
off at a desired time; it isn't
a clock-radio.

Should the user desire to
conserve power when oper-
ating the scanner from a
battery, a switch is provid-
ed on the rear panel to dis-
able the clock. The clock
may be displayed anytime
simply by pressing the
clock key.

In order to stop the rig
during the search mode, a
monitor key is provided.
This control also places a
particular frequency from
the search range into a
special memory for future
reference or transfer to one
of the scanner's regular
channels.

A mobile mounting
bracket is provided in order
to permit installation in a
vehicle. A unique three-
wire dc power cable is also
included, consisting of
black, brown, and red leads.
The black cable is connect-
ed to negative ground and
has an in-line connector for
easy removal of the scan-
ner. Red is connected to
+ 1 2-V-dc continuous
power source, and the
brown lead is connected
to +12-V-dc accessory
fuse box terminal, [The
purpose of the second
+ 12-volt connection is for
memory retention and
clock circuits.)

A single external anten-
na terminal is provided,
which is a decided advan-
tage to the dual VHF/UHF
inputs on previous Realistic
models.

Rf Comments,
Specifications

While the scanner is de-
signed with both AM detec-
tion and FM quadrature de-
tector, the two circuits do
not function simultaneous-
ly on all bands. FM signals
are received on all bands
except the 108-1 36 MHz air
craft range, which is only
received in the AM mode.
The AM detector does not
function on any frequency
outside this band.

The Radio Shack Pro-
2002 was added to its Real-
istic line of scanners this

year and is a replacement
for the excellent Pro-2001,
While the 2001 covered on-
ly the conventional VHF-
high/low and UHF bands
(FM only) with 16 channels,
it did so with overall sen-
sitivity and audio clarity
superior to the Pro-2002. On
the specification sheets,
both are listed as having the
same sensitivity for VHF-
high/low and UHF bands In
operation, however, the
2002 cannot receive and re-
produce signals with the
same clarity as its predeces-
sor. Moreover; when field
tested in mobile operation,
the Pro-2002 had a high
amount of static and igni-
tion noise. Under the same
conditions, the Pro-2001 re-
ceived very little such inter-
ference. Another disturbing
point is the reception of im-
ages and interference in the
VHF-high band, especially
in metropolitan areas with
heavy signal density.

It is unfortunate that,
with all the features the
Pro-2002 includes, the rig
doesn't have a better rf
package inside. If its receiv-
er circuitry performed as
well as that of its predeces-
sor, the Pro-2002 would be
superb. Nevertheless, the
unit's frequency coverage
alone places it in a category
by itself, and VHF-high
band sensitivity is very
good,

Should Radio Shack
choose to re-manufacture
the Pro-2002 and improve
the VHF-high image rejec-
tion, UHF sensitivity, and
scanning/searching rates,
the results would be truly
appreciated by serious
monitor enthusiasts. Such
a revamping was done by
Radio Shack under simi-
lar circumstances with
the DX-300 communica-
tions receiver.

The Pro-2002 program-
mable AM/FM scanning
receiver is available from
Radio Shack, One Tandy
Center, Fort Worth, TX
76102. Reader Service num-
ber 479. ■

73 Magazine • December, 1981 97

Working a

DX station? No

Keeping a
SKED?

Rag

chewing? No

WB6YXY is completing the final phase in the stringent quality control
procedure that every Cubic Communications product goes through: An
On The Air Test!

We are not content to accept the fact that each transceiver goes through at
least 30 quality control checks during manufacturing, or that each radio is
given a 72 hour Burn-In, or that every transceiver must pass the torture of
the Shake Table, We at Cubic feel that the ultimate test is to put each unit
on the air and have it put through its paces by one of many hams on our
staff- We could, as many of our fine competitors do, only warehouse & re-ship
to the dealers with the hope that the equipment will work. That would be
cheapen However, Cubic Communications is building equipment for hams
by hams and when one of our staff has a QSO with a Cubic owner, they want
to feel confident that everything that could be done, was done to assure
satisfaction.

1 CUBIC COMMUNICATIONS

A membef ot ttto Cubtc Cot potation family of companies

305 Airport Road, Gceanside CA 92054 (714) 757-7525

^70

98 73 Magazine • December, 1981

juSnri

irnym

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[wjfc 1 1

nVi ^^i ■

ki mta

Dual VFOs Give You Two Radios for the Price of One!

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American design and construction
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DUAL VFO's each provide com-
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235 Watts input, SSB and CW on
al! frequencies

Utilizes an 8 pole filter which is
continuously variable for either
high pass or low pass,

CW Crystal Filter (optional).
40GHz 6-pole

Unique Visual Display of
Passband

External Receive Antenna Jack
allows separate transmit and
receive antennas

Tunable Notch Filter when com-
bined with passband tuning,
provides the ultimate in removing
interference

Selectable hard/ soft keying
makes the difference in pile up

Continuously Variable AGC lets
you hear the weak signal which
would normally be masked by
strong adjacent channel inter-
ference

Logrithmic Speech Processor

AF, RF and IF Gain Controls to
provide an infinite selection of
receiver dynamics

4 Function Meter reads S' units
in receive, and selects forward

power (calibrated in watts PEP),
reflected power, or ALC level in
transmit

Military Quality PC Boards of dou-
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Modulated Construction with PC
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Catl or write for a Free Brochure

IF Passband Tuning not to be con- Full or Semi CW Break-In
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CUBIC COMMUNICATIONS

A m&mt}Qr of ifte Cubtc Corporation tamify of companies

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PSU-6A
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ASTRO 103
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3T-2B

2k W Antenng Tuner

Cart C. Drumeller W5U
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An Easy L-Meter

you'll need a frequency counter

The measurement of
small values of induc-
tance often is difficult with-
out specialized (and expen-
sive) equipment. If, though,
you have a frequency count-
er, a handful of commonly-
available parts, and a bit of
ambition, the undertaking
is much simplified, If you
have a simple calculator,
the math takes only sec-
onds.

The idea is not mine. It
came from William Huff-
man N5CC, who asked me
to prepare an article on the
subject. Bill built the ancil-
lary device to be used with
a counter. The design is
straightforward and its con-
struction should present no
problem. A glance at Fig. 1,

which shows the schematic
wiring diagram, will reveal
a simple Colpitts oscillator.

This oscillator, which
should have excellent
short-term stability and
good long-term stability,
needs only the usual care in
construction. The two fixed
capacitors, constituting the
combination reactance-di-
viding network and capaci-
tance portion of the LC cir-
cuit, should be silver-mica
or, preferably, polystyrene,
for best stability.

As built by N5CC, the os-
cillator sits in a 12.5
cm x 8.75 cm x 7 cm (5" x
3" X275") cabinet The
Radio Shack 270-251 will

give you room to spare. In-
ternally, the 9-V battery
shares space with oscillator
components. Externally,
the front panel holds a
push-to~make momentary-
contact switch and a pin
jack for bringing out the rf
signal. On top is a pair of
binding posts for attaching
the inductor to be mea-
sured.

To use it, connect a
counter to the rf output pin
jack. Then calibrate the os-
cillator

Fig. T. Colpitts oscillator. Any high-beta NPN transistor
should prove to be a reliable oscillator over a wide frequen-
cy range.

100 73 Magazine • December, 1981

If you have an inductor
of known value, this is a
one-shot action However,
if you don't (and most of us
don't), you can do a fairly
accurate job by averaging a
number of marked induc-
tors. That's what I did. My
hellbox delivered up a num-
ber of rf chokes marked 47
jiH and 56 pH. In turn, each
of these was attached to
the inductor terminals and
the resultant oscillator fre-
quency was measured by
the frequency counter. By
presuming an accurately
marked inductor, one can
compute a presumed value

for the internal capacitance
of the oscillator circuit.

Average a stack of these
and you have a figure that
quite probably is reason-
ably accurate.

Here are the simple math-
ematical steps to follow in
the computation of internal
capacitance:

4n2fIlC = '\

C = 1/4ttY*L
C = 1/39.478/2L

Let an inductor marked
47 jiH be attached to the os-
cillator and the resultant
frequency be recorded (in
MHz). Presume it to have
been 1 032 MHz Then, to
have capacitance ascer-
tained in picofarads, CpF =
1/39.478 X(1.032)2X47

xio-*

= (1 X10*J/39.478X

1 .065 X 47

= (1X10W76

= 0.000506X10* =506,

Repeat this operation for
a number of marked induc-
tors and then average the
results. In my case, the av-
erage was very close to 500
pFf which seemed to be a

reasonable value consider-
ing the components in the
oscillator circuit.

Going back to our origi-
nal formula and using/ in
MHz, L in Henrys, and C in
picofarads, we see that:

LH = 1/4rt/*C
LH =1/39.478 p 500
LH = 1/19739/*
Lh=0,0000506//2.

Now let's put an inductor
marked 56 \A\t 5%, in the
oscillator. Its frequency
measured 0.9648 MHz.
Dropped into the formula:

LH = 0.0000506/(0.9648)2
LH = 0.0000506/0.9308
LH = 0.0000543
LmH = 54.3

[f we presume the induc-
tor was correctly marked,
the accuracy of the formula
is confirmed. All you need
to remember for future
measurements is one con-
cise formula:

Luh = 50.6//2MHz-

There are a few precau-
tions to be observed. The

lead from counter to oscil-
lator affects frequency, so
it should be precisely the
same from calibration to
use.

The developer, N5CC, rec-
ommends that several oscil-
lators be used for enlarging
the range of inductors to be
measured, His prototype,
which has 1000-pF capaci-
tors in the LC circuit, works
best in measuring low-value
inductors. He suggests the
use of 10,000-pF capacitors
for inductors in thel-mH to
1-H range,

Note that the accuracy
of inductor measurement
hinges upon two factors:
the accuracy of the fre-
quency counter and the
precise knowledge of the
calibrating inductor. The
former should present no
problem, but finding an in-
ductor of an exactly-known
value is not easy! Take con-
solation in the fact that its
use is required only oncelB

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73 Magazine ■ December, 1981 101

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102 73 Magazine • December, 1981

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Kart J. Thurber, jr. W8FX
31 7 Poplar Drive
Mittbrook At 36054

A Quad for Two Meters

the Palomar portable power picker-upper

For the most part, we
take the ease and con-
venience of two-meter FM
operation for granted.
Since it's possible to access
a repeater in many areas
with almost no antenna,
there's a tendency to let the
repeater do all the work,
just getting by with an abso-
lute minimum for a port-
able or mobile antenna-
rubber duck( quarter-wave
whip, or the like. This ap-
proach works most of the
time, allowing casual oper-
ation through repeaters,

but often falls far short of
providing really good per-
formance when working
simplex and when used un-
der demanding conditions
of rough terrain, contest
competition, and poor
propagation paths.

If your fancy turns to
backpacking, mountaintop-
ping, and similar ham pur-
suits, the added forward
gain and physical selectiv-
ity offered by a small beam
will reap handsome divi-
dends. Most apparent will
be the improvement in

Portable two-meter quad from Palomar Engineers.
104 73 Magazine • December, 1981

transmitted and received
signal levels, but — very im-
portant to whose who regu-
larly operate from the high-
er elevations — the "physi-
cal selectivity" (front-to-
back and front-to-side dis-
crimination) offered by a
beam will make such opera-
tion a great deal more or-
derly, reducing the tenden-
cy to key up several repeat-
ers simultaneously and sort-
ing out signals on the popu-
lar simplex frequencies.
One of the most suitable
antennas to do these things
is the quad.

The quad is primarily
considered an antenna for
the HF bands, with its as-
serted element-for-element
superiority over the yagi
and its potential for use of
low-cost construction
materials. But the quad is a
good performer on any fre-
quency, and in recent years
has received increasing at-
tention as an effective and
efficient VHF and UHF
antenna.

There are a number of
reasons for looking at the
quad for VHF/UHF use. The
antenna can be built of in-
expensive and easily-ob-
tained materials, and its
performance can be equal
to or better than other ar-
rays of comparable size.
Adjustments for resonance
and feedpoint impedance
matching are easily made,
and the antenna readily
lends itself to stacking
either side by side, or one

above the other, as with
yagi arrays. Too, the quad is
a relatively broadband an-
tenna, making it particular-
ly useful on the wider
VHF/UHF bands.

The basic quad consists
of a full-wavelength driven
loop and a reflector, which
is cut about 5% longer than
the driven element and
spaced between 0.15 and
0.25 wavelength. Closed
loops can also be used for
the directors, in which case
they are made 5% shorter
than the driven element
Any reasonable number of
directors can be added, un-
til the antenna becomes too
bulky and unwieldly and a
point of diminishing returns
is reached.1

As a rough guideline,
when compared with the
half-wave dipole, the two-
element quad shows a gain
of 6-7 dB, as opposed to
a 5-dB gain for a two-ele-
ment yagi. The three-ele-
ment quad (reflector,
driven element, and one di-
rector) is capable of about a
10-dB gain, while a five-
element quad — generally
considered impractical at
HF frequencies except by
the hardiest "antenna farm-
ers"—checks in with a gain
of 13 dB,

^or a specialized discussion of
the quad on the higher bands,
refer to the RSGB VHF/UFH
Manual, by D.S. Evans G3RPE
and G.R. Jessup G6JP. A British
publication, the book is readily
available in the United States.

Besides the plain-vanilla
quad, there are several spe-
cialized configurations
popular on VHF and UHF.
The so-called Swiss Quad,
pioneered by HB9CV, is an
all-metal, mechanically-ex-
cellent, all-driven array hav-
ing a radian pattern com-
parable to that of the ordi-
nary quad. The expanded or
bi-square quad is a takeoff
on the basic configuration,
in which dimensions are ex-
panded to two wavelengths
for each loop (for added
gain); dimensions are still
practical even on the
lowest VHF band, 6 meters,
The Super Quad describes
virtually any combination
of standard (one-wave-
length) or expanded (two-
wavelength) quads stacked
in various arrangements to
yield very high gain figures.
Finally, the Quagi, which is
a hybrid antenna blending
features of both the quad
and yagi into a single de-
sign, uses a standard one-
wavelength quad driven
element and reflector in
combination with dipole
(yagi) director elements.
The result is an antenna
boasting high gain, simpli-
fied construction, and easy
feed point matching.

Regardless of type, sim-
ple quads scaled to VHF
and UHF dimensions are in-
creasingly popular in moun-
taintopping, Field Day,
backpacking, and portable
operation for reasons of
economy, bandwidth, high
gain, portability, and rela-
tive ease of construction
An interesting commercial
two-meter portable unit —
perhaps the first commer-
cially produced — is the Pal-
omar Engineers collapsible
quad. Designed particularly
to extend the range of low-
power two-meter transceiv-
ers by providing the gain
and front-to-back discrimi-
nation of the two-element
quad, it is a good candidate
for serious in-the-f ield work
when one would like to
have the effective gain of a
linear amplifier but without

being saddled with addi-
tional battery power and
weight requirements.

The Palomar design is
based on one of the several
portable quads described
by R.J. Decesari WA9CDZ/6
in the September, 1980,
issue of QST.2 The Palomar
antenna, presented as a
good alternative to a stan-
dard 4-element yagi, is ca-
pable of up to 6 dB forward
gain with an excellent front-
to-back ratio

The original WA9GDZ/6
designs were the results of a
quest to construct a highly
portable (non-yagi) antenna
that packed a substantial
gain into a small package;
efforts to design a collapsi-
ble yagi had proved overly
large and cumbersome, Sev-
eral alternative designs were
built, some with 45-degree
diagonal polarization for
good compatibility with
both FM (vertically-
polarized) and SSB/CW (hor-
izontally-polarized) modes,
and some with straight ver-
tical polarization. Other
models were built that used
different methods of keep-
ing the quad spacers erect.
The Decesari antennas can
be made from any of several
hardwood, plastic, and Plex-
iglas™ material; the loops
are constructed of copper
wire.

Palomar Engineers are
the exclusive manufacturers
of the patented 2-meter ver-
sion, which is based on the
Fig. 7 design in the QST
article.

The antenna uses quad
d riven-element, reflector,
and spacing dimensions op-
timized for 146-MHz opera-
tion, with the feedpoint at
one side of the driven ele-
ment to yield a vertical po-
larization characteristic for
FM work. These figures work
out to a driven element
about 1,72' on a side, a re-
flector 1.80' on a side, and

'Decesari, RJ> WA9GDZ/6, "A
Portable Quad for 2 Meters."
QS Tt September, 1980.

an element spacing of about
16", In this design, the ele-
ments are made of #18 PVC
hookup wire, the quad
spider" is lucite, while the
spacers, boom, and mast are
of wooden dowel construc-
tion. The storage contain-
er/support is fabricated
from cardboard and has a
varnish coating. The anten-
na uses knurled brace
thumbscrews to hold the
spacers in place. Four
wooden spokes at the bot-
tom of the storage container
form a stand to provide sup-
port for the antenna, both to
keep it steady and to pre-
vent its blowing over (mourv
taintopping, you know!). To
aid in 50-Ohm feedltne
matching, a matching stub
and trimmer capacitor ape
provided.

At present, the antenna is
sold fully assembled. Ac-
cording to Jack Althouse
K6NY of Palomar Engi-
neers, they plan to furnish
them unassembled in the
future. Also expected are
some changes in mechani-
cal details to lower the cost.

We found the antenna to
be an ingenious one, cer-
tainly worth consideration
by the serious backpacker,
to whom portable means
just that. When collapsed,
the antenna folds com-
pletely into the storage con-
tainer/support tube, with
the spacers folding along
the longitudinal axis of the
boom. Overall weight is but
1-1/4 pounds, We did con-
sider the antenna stand to
be a bit on the fragile side,
so one must take care in
carrying it, in its installa-
tion, and in its use.

Although rigorous anten-
na pattern and gain tests
were not performed, the
portable antenna exhibited
a marked forward gain and
front- to- back ratio. These
characteristics were clearly
evidenced when working
through repeaters outside
the local area, where rotat-
ing the antenna produced
the anticipated signal
strength changes. The quad

antenna's superior perfor-
mance was quickly noticed
when making comparison
checks between it and a
5/8-wave whip, when driven
by a two-Watt handie-talkie
(HT), When using several re-
peaters 25-35 miles distant,
the HT-mounted 5/8-wave
resulted in marginal perfor-
mance on both transmit
and receive, while use of
the quad made operation
into several of these repeat-
ers almost full quieting
When the quad was com-
pared with the HT's stock
rubber duck, there was
hardly any comparison at
all: Some repeaters that
were marginally readable
on the rubber duck were
very nearly full quieting,
and it was often possible to
access machines that were
unusable before because of
inadequate signal strength
from the HT.

What about swr? We
found that the standing
wave ratio was quite ac-
ceptable across the entire
frequency range covered
by the antenna. Swr at the
design center frequency of
146 MHz ran about 1.1:1
and changed almost imper-
ceptibly over the 144-148
MHz range. These measure-
ments were made without
any pruning of the antenna
or adjustment of the match-
ing stub Being very broad-
banded, it's unlikely that
any adjustments would
have to be made.

We found the little quad
to represent a novel idea as
far as VHF antennas go It's
a highly compact but prac-
tical package especially
suited for on-the-go opera-
tion. Perhaps a bit dear at
$87,50, but with the price
subject to downward revi
sion when the antenna be-
comes available as a kit, it's
a very nice range-extending
accessory to have and use.

Who says hiking can't be
fun?

For more information,
contact Palomar Engineers,
Box 455, Bscondido CA
92025.

73 Magazine • December, 19B1 105

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106 73 Magazine * December, 1981

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Character

Lines

45-1200 Baud RTTY
1-100 WPM Morse

2 Page
Display

Code

Black
o, Half

36 White »

:ter Characters ^Fu '

J Unshift ^P'" *

Status I on Synchronous

Indicator I Space Idle

on Screen / (For Baudot) ("Diddle")

Auto

TX/RX

Control

Auto All 3 RTTY i

Four Internal Mark-Hold Shifts

RTTY Demodulators ("^h or Low Tones)

. High Tones JU^ Standard) L£D Tuning |ndicafors

• Low Tones (lARU Standard) p?

• 103 Modem (1070/1270 HZ) On-Screin Tunina Bar

• 202 Modem (1200/2200 HZ) °n Scr^|||™mfl

Ext. Scope Connections

Audio or
RS232

Data

Transmit

and Receive

With RTTY Loop Devices

Audio Monitor
ut Audio For Either

From input or Output

ver or Tape Signals

Internal Speaker
Plus External Output

Input Audio

From

Receiver or Tape

T2100 System:

• CT2100 Communications Terminal

• KB2100 Keyboard

• Video Monitor

• Printer (300Bd Serial ASCII-MPI 88G)

RM2100 Rack Adapter
MSG2100 2000 Character
"Brag Tape" ROM

• 24 Line Display

• 2 Pages of 72
Character Lines

-or*
4 Pages of 36
Character Lines

• Split Screen
(withKB2100)

Communication 9 Terminal

CT2100

m»

Monitor

KB2100

k-3«5

HAL COM.
BOX 365

Urbana, Illinois 61801
21 7-367-7373

ATIONS CORP

NOW! HAL Equipment is
in stock at leading Amateur
Dealers.

ftVlM HELP

I am in need of a schematic
and/or operating manual for a
Morrow MB-6 receiver. Ill pay
postage and copying costs.

Steve Stout KA5CRI/9

1537 Winslowe Dr. #VB

Palatine IL 60067

I am looking for a cabinet with
legs for a Tempo One. I am will-
ing to pay a reasonable amount

for it and the cost of shipping.

In addition, I am looking for a
manual or copy of same for a
Heathkit Model Gt>lB grid-dip
meter. 1 will pay postage and
return original since I can copy if
you cannot. Thanks.

Doug Applegate KA8BDC

9648 Reynolds Rd, NE

Newark OH 43055

I need schematics, service
manuals, or connection instruc-
tions for an Akai VG100 TV cam-
era (s/n U51 11 5-9078) and
VM100 monitor (s/n U51115-
9073). I will pay postage both
ways or Xeroxing costs,

Peter Z. Simpson KA1 AXY
18 University Dr.
Natick MA 01760

I need any info you may have
on modifications to the Heatnkti
SB-303 receiver and SB-401
transmitter. I also would like to
know if anyone has built a con-
verter for the SB-303 for the

SWBC bands (9,5. 11,5r 17.5
MHzf etc.). Til gladly pay for any
photocopies sent. Thanks.

Thomas W. Gates AB5G

Rt. 1 , Box 572

Deville LA 71326

I would like to contact anyone
who is using the Xitex MRS-100
RTTY-CW computer interface, I
am having trouble with the unit
and t would like to be able to
hook it to my HS or my H-89
(preferably the latter).

Robert W. Sioat K4VGN

PO Box 05-37

Tice FL 33905

MODEL II

•61 1°° DISCOUNT
Off List

64 K 1 DRIVE $3288,00

No Tuxei on Out of Slale Shipmenli

TKS 80 DISCOUNT

BUY DIRECT

We carry the full line of TRS-80 Computers. All
other software, furniture, and accessories at dis-
count from catalog price, We stock most items
to assure you fast delivery and save you money.

WRITE FOR A FREE CATALOG
1-800-841-0860 Toll Free Order Entry

MICRO MANAGEMENT SYSTEMS, INC.

MODEL lit

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Immediate Shipment On Mo*l Item*

DOWNTOWN PLAZA SHOPPING CENTlft
MS C SECOND AVE S.W,
CAIRO, GiOflOlA 31728
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26 1066 48K III

2 Drives. RS232 2069,00

^-313

Largest Inventory m S.E. U,S A

WHAT IS AN AUDIO FILTER?

Why buy a Ddtung audio filter when
you can get other audio fitters fa*
halt me prce^

To answer ihts you first need U
re*ncmbe' thai the btie audio Nie*'"
can mean anyfhario, even down to a
couple oi 74 1 s and a handful o<
parts Only by companng kfce with

:an you make an informed
decision Ttiisn^eansajrnpanng
'eatures pedormanra and quality. It
you send lor our free dala sheets
and compare our products with the
compeiition you will see that really there is virtually no composition
at our chosen standard of performance

$149.95

Model FL1

. Whal other audio filler can
M tune into heterodyne
A mtederence like tune>up
wntsties and notcn them
out automatically fcfce our
m Mode^FLi^ Yet Model FU
W is also such a good CW Gtef
m M r^airtswidetyusedoy
Hr omfessionvai traffic handier?
W What other audo fitter has
HF passband edges sharper tnan SSB
ea^ crystal Inters and yel which can be
tuned at will from 200 to 3500 Hi'* To pull off ihii trick our
Model F 12 uses no lev. i inn 32 op amps plus siate-of-ihe-
art pulse Width modulation lechmques. Two5-poJe elliptic
filters and a 2^ pole peak or notch filter In one box all
independently tuneable add up to a lot more; filtering
capability lor SSB RTTY CW lhan you will Fund m any other
audio filter that we know oi
To answer our ouestion men an audio fairer tan oe almost
anyflwq On tne other nana the phrase Oaionq Audio
Fffte* rs a km more precise- M stands for state of me-ari
Mtennq backed by enlra capatawty e»t*a morouojh design
and eiira quahty If you need confiirnatfon ask a user' ~
* dckhonal products

Just as owf two auflo Wiirs set new standards tor nnovation and
inveniiqn out otner prorxcrs O&mana serious consider al*n fa* tne
samtf ree&QTO Eachntfer*, aurMqueoxiitiiftati0f>offeaiure5 wNrh

you am it not tmt} anyrtfifli | else We
don p have space rvrc lot tne fuH
siory but our data in**** are
<tvd>la&e free cm f eouesi Someone!
d*<*H roaow

Model ASP The "'smarT rf

The automate circuitry m Modal
ASP senses your voce level and
reads accordingly to always

maintain the degree of true rt

clipping selected nn decibels) by

Ihe panel push-buttons Novel

circuitry avoids "hang-up5M by discriminating against notaespikes and non-speecn inputs Make no

i r u h rake. Model ASP connects in the microphone line yel gives irue d dipping for speech

enhancemenl with minimum dtslortlon.

Model O70 The go -anywhere Morse Code Tutor

Ettractmg suly hours ot code practice from a low cost nine volt battery ModeiOTO gives you freedom

to practice anywhete to su*t your timetable and lifestyle Model D7Q s variable e*tra delay between

•etters is the key to painless prowess ^ code receptiori Simprv set the SPEED com roJ to say 12

words per mmute and reduce the entra OE lay as v our ab*ty improves

Mode! ASP

$99.95

•irrtBit

*"*«c*is

m-ji u^n 5'

f ■" # • a*

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Qftrc^nr,

Model D70

DC tun N
rmmwm 1 nMtr* cm
EU*CMUY luil*Bl* lor ul* witn Mod#l PC 1
to add 50 kHz to » WHr coverage N)
1% 7* $MUntMto§w. Uses Scnortkv mUer PTH board
Stn overrone crytti* oscillator. Price %T4 95
Model VLF i Cr yiiei conTfoiied convener eoai iQ hm i
to 500 kH i reception fo » D lo MSWHi receiver
price *W-«

Model r*Ci : Adds f¥ti receive
cover aae iram so* Hi to 30 MMi
lo i«y 1 mefrt all mad* rig
) Deitgned l©r high performance
Modtr pci raaturn LSI
SynThel'Ser^ tor 1 MHj slept,
parametric mlicer for PKtra good
tfynamic riingp, oulornallc letacllon
of rf preselector filters. Same case
Sfyl«dSPL3and ASP Price 1159.95

Technical

Products
Corp

Box 62t
155 SBates St,
Birmingham, Michigan 4S012
Telephone 313/644-5695

ALL DATONG PRODUCTS CARRY A 90 DAY WARRANTY
VISA - MASTERCHARGE WELCOME

^329

108 73 Magazine ■ December, 1981

Hand-Held to Mobile and Back Again!

Simply plug in your loom IC-2A and your synthesized portable becomes a 25W

synthesized mobile rig — take it out again, all charged and ready, when you want
hand-held operation.

RF POWER

The Power Pocket accepts any version of
the IC-2A, applies its output to a wideband
rf amplifier, and delivers 25 watts to your
mobile antenna. Mobile talk-out power!

AF POWER

The Power Pocket provides 2 h watts of
audio output and a 4-inch speaker so
that messages can be heard above road
noise, even with the windows down. Also,
by using the Power Pocket's audio ampli-
fier, you can operate the IC-2A at low
volume — thus lower drain on the power
pack,

CHARGING POWER

The Power Pocket accepts and charges
all Icom battery packs, Its spring-loaded

charger pocket adapts to short or tall
packs, assuring firm, positive contact for
proper charging. The charging function
has its own independent switch and indi-
cator, so that you can charge the pack
whether or not the amplifiers are turned on-

MIC PREAMP

The Power Pocket is compatible with any
standard mobile microphone, thanks to
its microphone preamplifier. It is also com-
patible with the Icom speaker/mic through
jacks on the front panel.

Let Power Pocket add full mobile capa-
bility to your hand-held IC-2A portable.
Contact VoCom for the name of the dealer
nearest you.

VoCom

PRODUCTS CORPORATION

66 E. PALATINE RD PROSPECT HEIGHTS, 1L 60070

(312)459-3680

icom and (C-2A are trademarks of Icom America inc
Power Pocket and VoCom are trademarks of VoCom
Products Corporation * 1 9©i by VoCom Products Corp

See List of Advertisers on page W2

73 Magazine • December, 1981 109

RTTY To Go.

Loud and Clear.

TELEREADER

CW niTT 4§Cl) CWR-4S5

M * ■ »■

CU-JW 'HUH SMCt MOCK A *«»U i-*Gi i

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[NTRGDUC1NG

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*L«S O* U VOC - |_£S3 T«AH tlttt

H H

*QW1«

■■M

■■

77«' Portable HA I Telereader CWR-6S5A

Now RTTY can hit the road with vou, when
you take along this portable telereader from

HAL offers the smallest RTTY terminal
you can find. It's easy to pack and go — on
long drives, camping trips, boating, any-

where away from home.

Pick up your portable HAL Telereader at
your favorite amateur dealer store todav —
you can order it to go!

See HAL RTTY equipment at your favorite
amateur dealer store.

Write or call us for more information.

HAL Communications Corporation
P.O. Box 365
Urbana, Illinois 61801
f 2 17)167-7373

**345

• Baudot. Morse. ASCII

• Built-in RTTY Demodulator

• High or Low RTTY Tones

• Built-in 5*1 Green CRT

• Four-page Display

• Compact Size (12%W x 5H x 1 V/iD)

• With External Keyboard

• Runs on 12 VDC

e HAL mi

110 73 Magazine * December, 1981

©tfTIN© 4

C WHY GAMBLE? j

DEAL WITH US!

FOR THE BEST DEAL ON:

• YAESU

• KENW

• TEN-TEC

• ICOM

• INFO-TECH

• DRAKE

• SWAN

• COLLINS

^HAMRADIQjCENI

8340 42 Olive Blvd.* P.O. Box 28271 • St. Louis. MO 63132

YOU'VE SEEN THE REST .

NOW LOOK AT THE BEST!

MKB-2000
ONLY
$ 319.00

500 Character text buffer with BREAK feature
which allows you to transmit without clear-
ing your preloaded text.

Ten 40 Character programmabie message
memories which can be run together or made
to call each other for longer messages,

Buffer can be operated in character. wordT or
line mode and preloaded for later trans-
mission. Word mode allows you to send
smooth code, even if you "hunt and peck."
Each word can be typed in and edited before
it is transmitted. Pressing the space bar will
transmit the word. Also, selected segments
of the text buffer can be repeated.

Cassette interface allows you to record and
transmit very long messages or code prac-
tice tapes using a standard cassette re-
corder.

Built-in 110 VAC Power Supply

Memory Expansion Option with Battery
Backup will save your messages, operating
mode, speed and other parameters when the
power is turned off for up to 7 months. Built-
in charging circuit. This option provides a
1000 character text buffer and Ten 80 char-
acter message memories.

a r>Lf tttAtit Aiir miv/r> inn

ASK a DO Lit Our MVU-lUULr

Video Display. Copies

Morse, Baudot, and

ASCII.

•

O * • ■

Mtyfwm

MORSE Features include a 1-199 WPM speed
range, 9 setting weight control, 10 settings of
inter-character spacing all of which are key-
board selectable at anytime. Random code
generator which allows you to select 5 char-
acter groups of letters or letters, numbers
and punctuation. Special keys for CQ^E.BK,
AR.ASpBT.SK.V^KN and error. Rugged solid
state outputs for positive or negative keying.
Built-in sidetone with adjustable tone and
volume controls. Tune key for transmitter
tuning.

RTTY Features include 60,66,75,100,132,
WPM Baudot speeds and 110,300 baud on
ASCII. Automatic GR/LF with selectable V72
character line lengths, automatic LTR-FIG
shift, CW ID( QBF and RY test messages,
"Brag Tape" cassette interface, sync idle,
"Space" condition command, loop keyer out-
put and PTT line control.

Glass Epoxy printed circuit board with
sockets on all integrated circuits.

One Year Warranty on Parts and Labor

Attractive anodized brushed aluminum and
gray wrinkle finish case provides excellent
RF shielding, only 13.3 x 9.4 x 3,5 in.

MKB-2000 Keyboard (Morse Only)
RTTY Option (Baudot and ASCII)
AFSK Modulator

Memory Expansion w/Battery Backup
Reed Relay Output

Add $5.00 per unit for shipping U.S.A.

$319.00
$50,00
$50.00
$75.00
$25.00

Send For
Free Information

#^411

O CM/EL EC TRONIC S, INC.

-i

master Charge

787 BRIAR LANE, BELOIT, WISCONSIN 53511

(608) 362-041 0

Specifications and prices subject to change without notice or obligation

112 73 Magazine * December, 1981

When it comes to
AMATEUR

RADIO QSL's . . .

it s the

ONLY BOOK!

US or Foreign Listings

1982

NOW READY!

Here they arer The latest editions, world-
famous Radio Amateur Callbooks, the
most respected and complete listing of
radio amateurs, LJsts calls, license classes,
address Information. Loaded with special
features such as call changes, prefixes of
the world, standard time charts, world-
wide QSL bureaus, and more. The U.S.
Edition features over 400,000 listings,
with over 70,000 changes from last
year. The Foreign Edition has over
370,000 listings, over 60,000 changes.
Place your order for the new 1982 Radio
Amateur Callbooks, available now.

Eich Shipping Toul

D US Calm wk

D Foreign
Calibook

$18,95 $3,05 $22,00
$17,95 $3,05 $21.00

Order both books at the same time for
$39,95 including shipping.

Order from your dealer or directly from
the publisher. AVI direct orders add shipping
charge. Foreign residents add $4.55 for
shipping. Illinois residents add 5% sales tax,

SPECIAL LIMITED OFFER!

Amateur Radio

Emblem Patch

only $2,50 postpaid

Pegasus on blue field, red lettering. 3" wide
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^WHAT WILL YOUR NEW

RIG BE LIKE?

Read 73 and Find Out

The magic of digital electronics is coming to ham gear - . . and you' II be able to read about these
developments in 73. There probably will be more changes in ham equipment in the next few
years than ever before in history. You'll see these changes coming in 73, where you'll read about
the experiments and pioneering. 73 has more articles than any other ham magazine , 4 . often more
than all the others combined.

When sideband got started, it was moved along by the many pioneering articles in 73. In the 60s
it was solid state, with several times as many articles on the subject than in all the other magazines
combined. When repeaters and FM got going about ten years ago there were over five times as
many articles on the subject published in 73 as in all other ham magazines combined, . and you
can see what changes that brought to hamming. Now we're looking at exciting developments
such as narrow band sideband for repeaters. . . which might give us six times as many repeaters
in our present bands. We're looking at automatic identification systems which may make it possi-
ble for us to read out the call letters of any station tuned in . , . and even the development of self-
tuning receivers.

Will stereo double sideband techniques make it possible to have up to 30 times as many stations
within a given HF band as is now possible? Hams will be experimenting and reporting on these
developments in 73, 73 is an encyclopedia of hamming. . . present and future. . . and just a bit of
the past too,

Without the endless fillers on station activities and club news, 73 is able to
publish far more information . . . valuable information . , . on hamming and

ham equipment.

You may or may not be a pioneer, but you certainly will want to keep up
with what is happening and what the new rigs are going to be like. And, frank-
ly, your support of 73 is needed to keep this type of information coming*

v»

Name.

g bill me for 1 year of 73 Magazine at 525X30

31DB6

Address

City

State.

■Zip.

Canadian S27/1 year only, US funds. Foreign $35/1 year only. US funds

Please allow 4 to 6 weeks for de#very
73 Magazine «PO Box 931«Farmingdate. NY U737

114 73 Magazine * December, 1981

OMN1-C has what it takes to filter the
crowds. To narrow the Amateur Radio
wortd right down to the particular signal
you want, The selectivity, sensitivity, dy-
namic range and operational features
you need to cut any crowd down to size.
Tailored i-f response. OMNI is equipped
with the potential for seven response
curves to handle any listening situation.

Standard filters include an excellent 8-
pole 2.4 kHz crystal ladder filter and, in
addition, a 150 Hz active audio cw filter
with three ranges (450f 300. 150 Hz).

Optional filters include 1.8 kHz 8-pole
crystal ladder ssb filter, 500 Hz 8-pole cw
filter* and 250 Hz 6-poie cw fitter

Front panel switches put any optional
filter in series with the standard filter for
up to 16 poles of filtering for near ulti-
mate skirt selectivity.

Four i-f response curves for ssb and
three for cw. That's response tailoring,
thafs crowd control
Optimized sensitivity and dy-
namic range. The OMNI sen-
sitivity range of 0.3 ptV typical
(slightly less on 160 & 80M)
combines with a 90 dB dy-
namic range to provide
an ideal balance that will
handle any situation
from copying a weak
signal half way
round the world to
keeping the next-
door kilowatt
from muscling
in. And a PIN
diode switched
18 dB attenua-
tor is included
for extra insur-
ance against
overload.
More crowd-
handling fea-
tures—and all
standard
equipment.
Built-in notch
fitter. To drop
out unwanted
signals or car-
riers. Tunable
from 200 Hz to 3,5
kHz, with a 50 dB
notch depth.

3-made. 2-range
offset tuning. To put
you where the others
aren't and where the elusive DX is. Move
just the OMNI receiver, or just the trans-
mitter section, or the entire transceiver
^500 Hz or ^4 kH2. For complete free-
dom of frequency movement to get away
from the crowds.

Built-in noise blanker for those times
when your noise- generating neighbor is
crowding your receiver. Filtered to han-
dle the big signals easily.

2-speed break-in. When QRM or
QRN is heavy, switch to "Slow." Use
'*Fasf for instant, full break-in for enjoy-
able rag-chews or stalking DX.
OMNI-C features stand out in any
crowd.

All solid-state— from the pioneer, Ten-
Tec

12 3 4

OMNI SERIES C I-F RESPONSES

WITH STANDARD AND

OPTIONAL FILTERS,

The Rig That

Filters The Crowd

IHO^l

P ■*

HP- - 4MM

TEN-TEC O

Hz ° CJ Q O D O

T « » rv

NOTCH FILTER PERFORMANCE

ADJUSTED TO 1 kHz POINT.

All 9 hf bands— only crystals are needed
for 18 and 24.5 MHz bands.
Broadband design for instant band
change without tune-up or danger of
damage to the final amplifier Another
Ten -Tec original.

"Hang" AGC for smoother action.
WWV reception on the 10 MHz band.
Digital readout in two colors, red for
the 5 significant places, green for the 6th
digit ( 100 Hz). Instant recognition
Separate receiving antenna capability.
Switch receiver to a common antenna lor
Iransceive or separate receive-only an-
tenna; the system also acts as receiving
antenna by-pass with an instant break-in
linear amplifier or transverter
**S"/SWR meter, electronically switched
200 watts input, all bands, with 50-
ohm load. 5 year pro-rata warranty.
100% duty cycle on all bands up to 20
minutes. Full RTTYand SSTV power.
Built-in VOX and PTTwith front panel
controls.

Built-in phone patch jacks for easy in-
terface.

Built-in zero-beat switch for spotting the
exact frequency of a DX station.

Built-in adjustable sidetone volume
and pitch-

Adjustable threshold ALC, op-
timum power for driving a lin-
ear. Provides means of
working into a high SWR,
Front panel control of
linear or antenna. The
rear panel bandswitch
terminals control relays
or circuits in step with
front panel band-
switch.
Automatic
sideband se-
lection plus re-
verse.

Low distortion
audio, less than
2%; a Ten-Tec
trademark.
Clean signal,
exceeding FCC
requirements.
High stability
over wide tem-
perature and
voltage excur-
sions.

Built-in speak-
er, compre
siorvloaded; in
bottom of cabinet.
Plug- in circuit boards
for fast easy service.
12-I4V dc power for
easy mobile use.
Full complement of accessories:

►del 280 Dual Primary AC Power Supply.
69, Model 255 Deluxe Power Supply/Speaker
Comho. $199_ Model 243 Remote VFO, MS9.
Model 215 PC Microphone. $34 30. Model
214/234 Microphone/Speech processor
$39/$ 139. Model 645 Dual Paddle Keyer. $£5_
Model 670 Single Paddle Keyer. $39: Model 227
AntentM Tuner, $79. Filters, $55 ea.

Made in the U.S.A.

Model 546 OMNl-C transceiver $1289

Get out of the crowds with OMNl-C. See
your TEN-TEC dealer or write for details.

»*

ITU, AUStO

wuim

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SEVIEHVILLE. TENNESSEE 378S?

73 Magazine • December, 1981 115

Cot in Richards 9M2CR

73 latan Pantai

Port Dickson. Malaysia

Chopstick" Helical for 432

satisfies your Phase III appetite

Forward gain, forward
gain: that's the cease-
less search in satellite work.
It's a task that jumps to the
forefront with the approach
of a new breed of satel-
lite—Phase 1 1 IB.

The Phase 1MB satellite
will be put into a "pseudo-
synchronous" orbit — which
means that it will offer
many of the advantages of
commercial synchronous
satellites. It will swing
around the bottom of the
globe at a low perigee of
1500 km and then hurtle
out to an apogee of 36000
km — and (here's the bonus)
— its movement relative to
an earth station for the 4
hours spanning this apogee
will be small. For four hours
there will be an almost-sta-

tionary satellite up there,
covering half the globe

For the first time, radio
amateurs will be able to
communicate on a world-
wide basis using VHF
+ UHF, thus skipping many
of the baneful problems of
HF propagation. What's
more, Doppler shift at the
apogee will be very slight —
so that the skillful search-
ing and re-tuning so essen-
tial with low-orbit satellites
will no longer be required.

But there is a price to be
paid for these advantages!
Path length at apogee is vir-
tual ly the same as that for
commercial synchronous
satellites. While they coun-
ter this path loss by using
giant 30-metre dishes and
low-noise amplifiers on re-

eff *.- &00*

MATCHING
SECTION

* REFLECTOR

ceive, cooled in liquid heli-
um, no amateur can com*
pete with this! But latest es-
timates for Phase 1MB sug-
gest that we can get by with
an erp of 500 Watts— a tol-
erably modest figure. Of
course, a 500-Watt final is
out of the question for most
amateurs— so we have to
get our gain elsewhere —
notably from the antenna
system.

Phase 1 1 IB uplink will be
centered on 435.215 MHz
and will require clockwise
circular polarization.
So — how to make a high-
gain antenna with circular
polarization which can be
hoisted into the air and
pointed in the right direc-
tion without too much trou-
ble? That is the question.

FEED iMPEpAHCE
140 OHMS

CHQPSTlC* S**C£«S

5PACEJI ttlTEItVA.
PM • i Tn

50 OHM COAX
FEEDER

tt * }

1=435 »Hi

* = 37 ft m

Fig, 7, Ten-turn "chopstick" helical: gain 15 dBt beamwidth 36 degrees.
11$ 73 Magazine • December, 1981

Long-) ohn yagis — crossed
and phased — could offer
one solution, but at 435 that
phasing harness could pre-
sent problems, while im-
pedance matching is also a
chore.

So, why not a helical?
Here we have neatness,
high gain, wide bandwidth
and circular polariza-
tion—all in one, Scanning
the handbooks for design
info on helicals showed
that a ten-turn helix looked
promising: a gain of 15 dB
would persuade my 10-Watt
output to masquerade as
300 Watts, and a beam-
width of 36 degrees ought
not to be too finicky to
point. The boom length at
435 MHz would be about 6
feetf with a reflector 28
inches square — these
seemed manageable dimen-
sions. But what to use for
the helix, how to form it
how to keep it in shape? All
pertinent questions at this
particular QTH— with the
nearest parts or material
stores some 70 miles away.

The boom was no prob-
lem. A 6'4" length of
VX1/2" meranti timber
good and straight, looked
just about right — with the
1" edge vertical to avoid

, Theta 7000E
M icroprocessor-Control led

Communications
Terminal

New versatility
for the old bear
tn your station .

The perfect addition to any
amateur radio installation!
Complete, automatic send/
receive of Morse code (cw)
Baudot code (RTTY) and ASCII
code (RTTY), Works with
any video monitor

7-Channel Battery Back- Up Memory, the Theta 7000 E has
seven keyboard-selectable, nonvolatile, random access
memory channels each of which can hold 64 characters. Data
in these memories is alterable at any time and is retained
when power is removed. Messages in these memory channels
can be repeated 1 to 9 limes via keyboard command. All
channels may be daisy-chained tor continuous read-out
Channel number in use is indicated on display.

Wide Range of Transmitting and Receiving Speeds, 5 to 50

wpm in Cw with autotrack on receive. Standard RTTY speeds
of 60, 67, 75, and 100 wpm Baudot code and 110, 150, 200, and
300 Baud ASCII code.

Self Contained Demodulator, three-step shift selects either
170 Hz, 425 Hz or 850 Hz shift with manual fine tune control
of space channel for odd shifts. High/low tone pair select.
Mark only or space only copy capability for selective fading.

CONVENIENT KEYBOARD FEATURES, automatic keyboard operated
transmit, (KOX) or manual keyboard transmit. Unshitf on space, reverts
to LETTERS case after reception of each space clwacier in Baudot
code. CfVLF is automatically inserted every 60, 12 or 80 characters
while transmitting. Cw identification, in RTTY mode. Echo function,
prerecorded cassette tapes can be read and transmitted. Test
messages, "RY" and "QBF\ Transmit word mode, characters can be
transmitted in word groupings.

Suggested
List

Model 7000 Drake Theta 7000E Terminal $1095.00
Model 7009 Drake TR-930 Video Monitor $ 185.00

Crystal Controlled AFSK Modulator

High Tone Pairs

Shift

170 Hz

425 Hz

850 Hz

Mark

2125

Space

2295

2550

2975

Low Tone Pairs

Shift

170 Hz

425 Hz

850 Hz

Mark

1275

Space

1445

1700

2125

• Printer Interlace for Hard Copy, at! modes for parallel ASCII printers.
Loop keyer for conventional teleprinters. * Composite Video Output, for
any standard video monitor -Kansas City Standard AFSK Output, KCS
tone pair for ASCII. * Large Capacity Display Memory, two page display
memory contains 32 X 16 lines per page. * Split-Screen, wjth a
keyboard command, the display can be divided in two; the upper half
for transmit and the lower half for receive Messages can be composed
while receiving. * Buffer Memory, 53 character type- ahead keyboard
buffer • Word Wrap-Around receive mode, word wrap-around
prevents the last word on a line from becoming split in two. Moves
whole word to next line. • Automatic Letters Code Insertion, if desired,
LETTERS (diddie) code can be transmitted continuously \n a pause of
transmitting from the keyboard, • Audio Monitor, a built-in audio
monitor circuit with automatic transmit/receive switching enables
Checking of the transmit/receive tones. * Transmitter Keying Circuitry,
keys either grid block, cathode keyed, or sol instate transmitters. •
Power Requirement The Theta 7000E requires only 13.6 Vdc ® 1 amp.
Plugs into 13.6 Vdc accessory jack on PS7 or PS75 power supplies. *
Effective Packaging for RFI Protection, well designed metal cabinet and
protective circuits prevent RFI * Terminal Size: T5S*W x 11.8*0 x
4.7" H (40 x 30 x 12 cm) * Weight: 11 lbs (5 kg) - Monitor Size: 0.7 "W x
9<8"D x 8,9" H (22,1 x 24.1 x 22.6 cm) • Weight: 11 lbs £5 kg)

Model 1230 LA7 Line Amplifier $49.95 suggested usi

Line output* input Jevets as tow as 15 mV rms
(47 kitohm) will result in an output of 1 mW
nominaJ into a 600 ohm balanced line. Output
level adjustable by internal pre-set level
control. Interfaces low level audio to RTTY

term mat unit or phone line that requires a 600
ohm balanced/ unbalanced input. One 36
phono to phono cable supplied • Size: 4.5 " L x
1.3" H x 2.5 "W (11.4 x 3.3 x 6.4 cm). Weight:
.3 lbs. (.14 kg).

ideations, avaifaatfuy ants pnces su&t&ct to change without notice of obligation

R. L. DRAKE COMPANY

DRAKE

540 RirJiarrj St Mtamisfcurg. Ohio 45342, USA
Phone: (513} 866-2421 • Telex; 288-017

73 Magazine • December, 1981 117

any bending (as it hap-
pened, the antenna itself
turned out to be feather-
light and easily supported
by the 1"x1/2") But what
about the helix, and what
about the spacers?

Copper tubing was unob-
tainable; in any case, it
would have been expen-
sive, heavy, and difficult to
shape. Someone, some-
where had mentioned using
coaxial cable: so why not
RG-58? The outer screen
would simulate a tubular
conductor, the inner con-
ductor is not needed but
could be soldered to the
screen at each end. Good
grade coax has a tinned,
close-mesh screen with an
excellent weatherproof
sheath What could be bet-
ter? I promptly hunted out a
25-foot length.

Spacers were now the
problem, Most handbooks
showed 3 spacers per com-
plete turn of the helix, each
spacer being set at a 120°
angle to the last Since the
boom was rectangular, it
seemed more sensible to
opt for 4 spacers per turn,
and to put them at 90° set-
tings. The original plan was
to use 1/4"-diameter plastic
rod or wood dowel for the
spacers, but nothing re-
motely resembling such
material was available lo-
cally. Pondering the prob-
lem over a tasty meal of Fu-
yong egg, crispy chicken,
and Cantonese bean curd, I
suddenly saw the answer
there in my right hand:
chopsticks! Why not?

Chopsticks are available
in a wide variety of designs
and materials in Malaysia. I
chose simple, wooden, ev-
eryday chopsticks (not
bamboo) — undecorated —
sold in bundles of 20 for 25
US cents a bundle. As with
most chopsticks, the lower
half has a circular, tapered
cross-section, merging into
a rectangular shape for the
upper half. It couldn't be
better! I marked the boom
at 1.7" intervals and drilled
holes 3/16" in diameter —

consecutively at right
angles for its entire length.
The boom was long enough
to allow 3 to 4 inches to
stick through the reflector,
for clamping purposes. A
3.4" piece of the same
boom material was fixed to
the boom at the reflector
end, and the 17" intervals
were measured from this.
All this can be seen clearly
from Fig. 1

A drop of glue was put in-
to each drilled hole, and the

chopsticks were pushed in
one by one until they
wedged tight. A double-
check made sure that they
were put in with a clock-
wise spiral, as viewed from
the reflector forward (that
is, from the back of the
beam). When giving the fi-
nal push, each chopstick
was twisted so that the
square sides were roughly
in line with the path that the
RC-58 helix would take.
This made it easier to file a
small U-shaped depression
in the top to allow the
RC-58 to sit in neatly,

Chopsticks are generally
about 10 inches long, and
when pushed through the
boom about 4 inches pro-
truded on the other side.
These bits were carefully
sawn off. The helix diame-
ter is 9 inches, so a mark
was made on the last 4
spacers at each end of the
boom, at a point 4-1/2 inch-
es from the center line of
the boom. A fine hole was
drilled at these marker
points and thread strung
along from first to last
spacer in each of the 4
rows. This enabled the oth-
er spacers to be marked to
show where they should be
cut off.

After trimming, the tops
were filed into a U-shaped
depression in line with the

helix path, A small hole was
then drilled, an eighth of an
inch below the tip, so that a
piece of waxed thread
could be used to bind the
RG-58 helix in place.

One end of the 25-foot
length of RG-58 was bared

Colin Richards 9M2CR with the completed project

for half an inch, the sheath
and dielectric removed,
and the screen and center
conductor twisted together
and soldered Starting with
this end, the RG-58 was
bound to the short, straight,
end section (3.4 inches) next
to the reflector position.
The soldered tip was placed
so that it would mate with
the center terminal of an
SO-239 socket which would
be mounted on the back of
the reflector. The RG-58
helix was then wound care-
fully around the spacers,
one at a time, binding in

each spacer before moving
to the next. In this way it
was possible to ensure that
an even, circular spiral was
created— with no bulges or
flat sections, As we neared
the tenth turn, there was
about 8 inches of surplus
RG-58, This was cut off, the
end trimmed, and the outer
screen and inner conductor
were soldered together as
at the start of the helix.
The thread bindings were
touched with glue, and the
boom and chopsticks given
a coat of clear varnish and
set aside to dry.

The helical at work — note that the reflector frame is now a
lightweight bicycle wheel rim, which is "neater, lighter, and
better looking/'

118 73 Magazine ■ December, 1981

ICOM

FALL SALE

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AT YOUR SERVICE

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FULL

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FT708R

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Becoming your #1 Amateur Store,
Visit us on your next trip to
Washington, DC.

Calf our order desk toll
free for quote

(800) 336-8473

■'.

Tue-Sat
10am-4pm EST

Technical information,
VA orders (703) 938-3350
Store opens 10am Tues-Sat
Close 5pm Tues. Wed, Fri,
Close 9pm Thurs, 4pm Sat

516 Mill Street, N.W.
Vienna, Virginia 22180

OUR 10th YEAR
SAME LOCATION

DAI WA Communications

Essentials

Simultaneous SWR/Forward SWR & power METERS
& Reflected Power Reading

Tolerance: ± 107* full scale
Input/output Impedance; 50 Ohms
Connectors: SO-239

Mode! CN-62QB {New 2 K w Scale) Model C N -720B (New 2 Kw Scale)

Frequency Range: 1.8—150 MHz Frequency Range: 1.8—150 MHz

SWR Detection Sensitivity; 5 Watts min. SWR Detection Sensitivity; 5 Watts mia

Power 3 Ranges (Forward, 20/200/2000 Watts) Power 3 Ranges (Forward, 20/200/2000 Watts)

(Reflected, 4/40/400 Watts) (Reflected, 4/40/400 Watts)

Dimensions: 165 x 75 x 97 mm; Dimensions: 180 x 120 x 130 mm;

6.5x3x4 in, 7x4.75x5 In,

Model CN 630

Frequency Range: 140—450 MHz
SWR Detection Sensitivity: 5 Watts min.
Power 2 Ranges {Forward, 20/200 Wat Is)

(Reflected, 4/40 Watts)
Dimensions: 180 x 65 x 120 mm;
7,12x3,37x475 in

Frequency Range; 3.5—30 MHz
(Including WARC Bands)
Power Rating; 500 Watts PEP
Internal Dummy Load: 50 Watts/
1 Minute

Impedance Matching; 15-250 Ohms
to 50 Ohms Resistive
input Power Required tor Automatic
Tuner 1 . 5 or 10 Watts (Set by rear
panel switch)

Tune-up Time: 45 Seconds Max-
Power Requirement: 13,8 VQCI2 Amp

Coaxial

Switch*

Power Rating: 25 kW PEPt 1 kW CW

Impedance: 50 Ohms

Insertion Loss; Less than .2dB

VSWR: 1:12

Maximum Frequency: 500 MHz

Isolation: Belter than 50 dB at 300 MHz;

belter than 45 dB at 450 MHz;

adjacent terminal
Unused terminals grounded
Connectors: SO-239

4 Position/
Model CS-401

Exclusive USA agent
for these units;
inquiries invited.

Write for literature

2 Position/ A
Model CS-201 i

BELL

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Phone (213) 537-5200

See List of Advertisers on page 162

73 Magazine • December, 1981 119

i'2n EQUAL ANGLE

1/tE* * i/Z«i GALV
MESH OR ALUM
FLY SC*EE«

1/2 in EQUAL ANGLE
ALUM BRACKET
(BRACE)

BOOM 1 PROTRUDES
4 in.)

SUPPORT PIECE
EACH SIDE Of BOOM

ALUMINUM
MOUNTING PLATE

MOUNTING BOLT
NUTS

1/2 m. EQUAL ANGLE
ALUM SUPPORT
STRIPS

fig. 2. Front-view details of mounting the bracket on the

reflector.

The reflector came next

(Note the later improve-
ment in the photo of the he-
lical at work.) Half inch-
squared mesh CI screen
was used, and a 28-inch
square cut out and edged
with 1/2" X 1/2" aluminum
angle. A small sturdy alu-
minum plate was used as a
center mount for the reflec-
tor (it was, in fact, an old
door-lock plate!). An aper-
ture 1" X 1/2" was cut in the
center to allow the boom

end to fit through and pro-
trude 4 inches on the other
side of the reflector. Above
and below this aperture a
hole was drilled for a
3"X1/4" carriage bolt. The
bolts were firmly screwed
to the plate, with most of
their length also protruding
to the rear of the reflector.
Two more lengths of alu-
minum angle {1/2" x 1/2")
were screwed across the
plate in a vertical direction,
to make the reflector rigid.

\ 1 1 1 1 ■ 1 II

_ _■ * ■

\ \

, L

-p i — | — 1 — f — i— < 1 +■ ■ — ► — j —

J ___ —

■

^ S02^^ , 1 W T

_ _ [ ' ' 1 H

tin

\ \1 "

— _ L

■ii — — u

TmiTI '

" : F" ■■'■ i " ■ "

[ i

i ^_j . , L .„

T : ; ; : _Ti

... .^

* ' ' M l l J '

H-.

. _
-L-LJ—UJ

STRIPS

l/Zm EQUAL ANGLE

ALUMINUM FRAME
24 <n SQUARE

1/2 in 6.1. MESH OR ALUM

FLT SCREEN

J im SHO*N FQ* CLArtrTY J

I in ■ 1/2 m MOLE FOR BOOM

ALUMINUM MOUNTING PLATE

fig. 3« Details of the reflector

50239

MOUNTING BOLT

BOOM PROTRUDES A m. WITH
PIECE OF l in Jf 1/2 in EACH SIDE

FOR SUPPORT

2 ST ST rtOSE CLAMPS ABOUND
BOOM AND MOUNTING BOLTS

ALUMINUM MOUNTING PLATE

Fig, 4. Back view of the mounting plate.

The SO-239 socket fitted to
the plate, facing rearwards,
with its center terminal
lined up with the end of the
helix at section A in Fig. 1.
The antenna boom was
then pushed through the re-
flector mounting plate,
carefully squared up, and
fixed firmly in place with
two stainless-steel hose
clips around bolts and
boom.

The reflector weighed
about 8 pounds, whereas
the antenna-plus-boom was
only 2 pounds. A plywood
bracket was therefore fitted
at the balance point, just a
few inches from the reflec-
tor. Minor dents in the
RC-58 helix were pushed
gently into shape, and the
ten-turn "Chopstick" heli-
cal was ready for hoisting
aloft! Almost ready, that is.

Securing the boom to the reflector.
120 73 Magazine • December, 1981

The helix attached to the "chops tick" spacers.

^449

808 N. Main

Evans vi lie. IN 47711

SANTEC

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Call

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All accessories m stock

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$1050.00

580 Delta

750.00

525 Argosy

480,00

225 Power Supply

115.00

290 Power Supply

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256 Power Suppiy.Spuker

170.00

243VFO-OrtW«

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234 Speech Procataor

12500

214 Bectret Microphone

36.00

215 Ceramic Microphone

25.00

227 Antenna Tuner

74.00

1 F — F I Iters, Omni- Argosy

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£45 Keyer

77,00

444 Hercules Amplifier

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Transmits perfect Morse Code * Built-in 16
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companion to our MORSE-A-WORD CW code
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MORSE-A-KEVER KIT, model MAK-K, Complete kit of parts & manual , . . . , $159.95

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(Essential parts kit for home-brewers consists of pc board, board parts and manual.
You supply ASCII keyboard, cabinet, power supply & miscellaneous parts. J

Send check or money order. Use your VISA or MasterCard. Add $5,00 shipping and

residents add 4% Wisconsin State Sales Tax,

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Corporation Telephone: (414) 241 8144

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New Automatic Antenna Tuner

Auto-Track AT 2500

Designed and Built by J, W. Miller Div.

Check these state-of-the-art specifications

■

Power Capability: 2500 W PEP.

Frequency Range: Continuous 3.0 to 30
MHz (including WARC Bands),

impedance Matching: 10 ohms to 300
ohms to 50 ohms resistive.

Direct Reading SWfl Meter: 1:1 to infinity.

Direct Reading Power Meter: Two meter
scales from 0 W to 250 W and 0 W to 2500
W; front panel switch selects FWD or
Reflected Power (Mummated panel 1 meters).

Power meter displays RMS with con-
tinuous carrier and automatically displays
PEAK when driven with SSB signal.

Dealer

Inquiries

Invited

Average "Automatic*' tune-up time: 15
seconds or less.

Tune-up time not affected by power level;
can be as Jow as 1 W (5-10 W preferred).

Power requirements are 115/230 VAC 50-60
Hz, 10 W operating/5 W standby; or 13.5
VDC, 1 A operating/.5A standby.

Antenna tuner packaged in cabinet 17 "W
x 5*i"H x t4*D (Front panel handles or
rack mount optional at extra cost)

Write for literature.

Spectficj lions stjb|ecl lo change without nolle*.

W. Miller Division

BELL INDUSTRIES

19070 REYES AVE ■ PO. BOX 5
CQMPTON, CALIFORNIA 90224

Phone (213) 537-5200

**5ee List of Advertisers art page TGZ

73 Magazine * December, 1981 121

ALL NEW
1 5 Meter Mobile CW & USB

21.000— 21.450 MHz

High I0W (PEP) low 2W (PEP); VFO tuning: noise blanker: fine-
tune SB, KHz ± CW off-set: digital frequency counter; I 3 SVdc
@ 3 A. negative ground; L 9.5* xW 9 kH 2 5 ; weight (2,3 kg)
5 7 lbs ; mobile mourning bracket UNDER $300

SERIOUS DEALER LISTS AVAILABLE

Nt&tU

.^311

1275 N, GROVE ST.
ANAHEIM. CALIF. 92806 (714) 630 4541

NOTE: Price. Specifications subject to change without notice

and obligation.

SQZ39

I Of * wi >A BOOM

UPPEfl MOUNTING BOLT

BOOM FfiOTmiDES THRU

V M ". CT1 I l

tOW£R MOUNTING BOLT

ST 5T HOSE CLAMPS (2}

ALUK'NUW tfC'UVTlNO PLATE

Fig. 5. Side view of the mounting plate.

There still remained the
question of matching to a
50-Ohm feeder The feed
impedance of a helical an-
tenna of this design is near
enough 140 Ohms (this
stays the same, by the way,
regardless of the number of
turns in the helix) A quar-
ter-wave matching section
should therefore have an
impedance of about 84
Ohms. The nearest coax is
RG-62, which has an imped-
ance of 93 Ohms. A quarter
wavelength at 435 MHz is
6.8", and the velocity factor
brings this down to 5 7"

(there's a trap here: solid di-
electric coax like RG-8 or
RC-58 has a velocity factor
of 0.66, but is partly air-
spaced and the factor is
0.84). After many "cuts and
tries/' the swr was brought
down to 1:1.1- So this time
the antenna was really
hoisted in the air and put to
work. Results? When used
as an uplink antenna on
OSCAR 7t Mode B, signal
reports have been encour-
aging; downlink on Mode J,
I can copy stations right
down to the horizon I think
it works! ■

J Reprinted from the December, 1980, Amateur Radio (Australia),

ANOTHER AEA BREAKTHROUGH!

PRICES 20% LOWER FOR IS0P0LE "ANTENNAS

The IsoPole antenna has the reputation for high quality, unique design and superior performance
IsoPoles have become the "standard of performance' in VHF/UHF base station antennas.

The demand for IsoPole antennas has grown steadily since their introduction. To meet the demand, AEA
has installed an automated production line. WeVe actually improved the quality of construction but most
importantly we have lowered production costs. This lower cost is now passed on to you with the price of
IsoPole antennas 20% lower

The IsoPole is designed for ease of installation. You can customize your mounting by using low cost TV
masting up to 1 % " diameter. (Mast not supplied.} More than ever, the IsoPole is the logical choice for a
VHF/UHF base station or repeater antenna.

The IsoPole antenna gives you exceptionally broad frequency coverage. You obtain maximum gain
attributable to the antenna's length, plus a zero angle of radiated power. The unique cone design (pat pendj
assures superior resistance to icing and
wind IsoPole antennas are weather
proofed and made of top quality compo-
nents. They use stainless steel hardware,
Ampheno! connectors, corrosion resis-
tant aluminum alloys and a dielectricic
material with excellent mechanical and
electrical properties.

Note the typical SWR plots for the
IsoPole- 144 and the new lsoPole-440.

There is an IsoPole antenna for 220 MHz also. See these fine antennas at your favorite dealer, or
Advanced Electronic Applications, Inc. JA ■■§ A

p.o Box 2160, Lynnwood, wa 98036 M% mm mm Brings you the
Call 206/775-7373 #%fe»#^ Break t hi

Prices and specifications subject to change without notice or obligation
122 73 Magazine • December. 1981

The communications terminal that does it ail!

TERMINALL if, a hafdwam and software system
wtucn converts your TR&-8Q* iModel 1 oi Mod*
into a stale at the art communications ter minal. TEA-
fcfllNALL is srmpte to u» TERMINALL g<ves you
mote for you* money TERMINALL works with a
genera* purpose computet aoti is expandable TfcR
MINALLhas tt all I

Simplicity

TERMINALL was designed from in* oulser to be
easy to connect to your radio and easy to use Plufl
*nio your receive* headphone jac* ana copy Morse
code or radioteletype IflTTYl Plug into your CW kev
lack a nti send Mtirse code Attach a microphone con -
nector and send Baudot Of ASCIt RTTY using audio
lories lAFSKl That's all more is to hooking it up

The software may be loaded into your computer horn
cassette or disk. En let your callsign and ihe time and
you wtH 518*1 tejeerviog >mmediate>y No settings pi
adjustments s*e necessary to receive Morse code -
fully automatic and it worts' You may type youi
message while receiving or transmit itftg

Yuu will he on Hie air, r&t:eivinfl and transmitting
mode m minute* As we said. TERMINALL lasitnpre,

More for your money

■ TERMINALL has the RTTY term 1 demod

and AFSiC bud? in This results m a iower total cost
because separate terminal units usually cost at least
5226 assembled, and most do not even have a crystal

continued AFSK. TERMINALL film unions not
the higher cost ol an external njrminnl unit but also
eliminates the hassle of Inteffautrtg (0 another piece
pi equipment

■ Outstanding documentation. I' ml fraternally
wtnten, 90 page user manual contains stf>r *p
♦nsiructrons explicit examples numerc
photographs and tHustrauor *?ory or opetal*on

parrs layouts schemapc diagrams 1 rouble shooting
guide

■ Buiit in software backup - set up the progniui
parameters and mi- . Him way vou like to opera (a

Ihen have the prnc'i- W ■in~wcQpyotil5S.il
oil her casselte or d

■ Software supplied 00 both cassette and auto run

(*tt& at no additional coat

■ Built in separate, mutli-st&ga active filter
RTTY and CW demodulators. Mp phase lock IpOpl
RTTV demodulator ban 170 and 850 Hi shift -key board
selectable and uses either ihe panel meter or scope
outputs for easy tuning. Copy the weak ones Copy
the nosy ones. Copy the lading ones

■ Buitt in crystal controlled AFSK. Rock stable lor
even the most demanding VHF or HF application
must on many VHF RTTY repeaters

■ Built in hardware clock - or ■►•■ m lorid readaul
maintains correct time even during cassette 1 '0 User
programmable tone ''dale lorrnat

■ Built in 110 or 220 volt AC power supph/

■ Built m parallel t trhwr software Simpdy at
tach a paraliei ASCII printer te g ihe EPSON MX 8Q>

to your printer port to obtain hardeopy m all modes

Note: parallel printers typically co*l toss than sane I
ASCII printers.

■ Fantastic Morse recaption; Six stage active filter
demodulator copies the weak ones Auto adaptive
Morse ajgonrhm copies the sloppy ones Keyboard
selectable noise threshold Received code speed
displayed on slams line

■ Word wrapping, wed mode eptimg. rtrddk?. ig
nore carriage returns, user prog ram mu ble end of Ifoe

Hfjquence, ad|ustable carriage width, Transmit delay
lined, nonf* or aula adapttvel Break mode and morel

■ The all-in one TERMINALL design "nakes il
great for use on Hf of 'am. Commercial. SWL
Of MARS* SWL s we wiM be happy to modify TER
MINALL lor 425Hz reception instead of B5GH/ at no
extra cost, if FGQueslOd wilh your or do* tSome Mews
«nd weather services use 425H7;'

General Purpose vs Dedicated

TERMINALL has capabilities far surpassing other
"dedicated terminal* systems And vet, smce it worts
on a general purpose computer the rnatonty of vow
investment 'the TftS-BOl «s spread out over many dit-

rit applicahons noi just Radio rtimmunrcalions
And you i system is expendable For example. Disk

based mailbox BoftvVflfO may1 be added at any time.

Simplicity of operation. Lower coir General pur-
pose computer. What are you waiting for? This la
ihe way to go'

Complete with software on cassette and diskette.
assembled and tested hardware, and e*tenstve in-
duction manual Specify Model I nr Modef III Level
II 1BK required. $495,

We Discount EPSON Printers

Call Now!

/VWCROTRONrCS inc. ®

1126 N. Golden State Blvd
Turlotk, CA

To order tod free 1 -800 344-7493

In CA and for service (209) 667-2888

Of 634-8888

15 Day Money Bach Trial Period. One year parts and labor limited
warranty . Add $4 shipping in USA, CA residents add 6% sales lax.

We continue to eipenence telephone difficulties! please keep trying

* Recognised trademark of Tandy Corporation.

TRS80' BUSINESS AND APPLICATIONS

O B D £ R N O PROGRAM NAME P Ri C E

33T&RD ClimafeCcimo iO^I 2 4 95

0267 R Electfcmic Bfeadboarti (Tape) 4995

025*Rt) F:nijrt Quick iDi- • 44 95

CM68R Label (Tape) 94 95

TRS80" UTILITIES

ORDER NO. PROGRAM NAME PRICE

024GR Compreiisppn UhMy PacMTapet 1995

0232R Tm? Oisassptrtblet iTapti 9 95

01B0RD Disk Editoi LDifth) 39 95

Q139RP Disk Scope ■■ 1995

023tflD DLDlSiDiski 19 95

0?38fl Dynarmt Device Dnvfta (Taps) 19 95

0199RD Dynamic Device Drives iD-ski 24 95

Q250R Irv [TapPi 24.95

Q350R0 try (Disk) 29 95

0058R Programmer's Converter i Tape i 9 95

&4QR PfD^ramTi^f ■. frirnfff |Tap€f 995

QT33R Rtnum'CampfBia iTappi '4 95

0230R TLDIS (Tape* 14 95

50C3R Ultra Mon i Tag?} ->4 9$

rns-Bo* EDUCATION

QRDE R N 0 PROGRAM NAM E PRICE

013frfl Begi" i»«an tfapei 995

0137R £«ef>rta> Ow 9 95

007l RO Geu^'apn* ftpign" USA (Oi 4995

02T2RO in Q^h (D . 2^ 95

Dia/fl S_ h« ^ape» 995

0?t4RD Teac^ 39 95

Q099R Typing Teache« »Tapei .95

TRS-60" GAMES, SIMULATIONS AND ENTERTAINMENT

OROERNO

0O17R

01O6R

0?40R

0213RD

0O51R

G223R

0724RD

0237ft

5Q07RD
5Q10R3D
021BR
01 71 fl

0205HD

L1519R

D1S9A

D37BRD

Qtt/R

0023 P

Q12QR

0043R

033ZR

0312R

5012R

50HRQ

PROGRAM NAME

i Tape*
Aumiil P»or fTapet
Alien At Jar •» Fors tTajjet
The Att Stars i Dt
Ball TunetGurmpF (TafMH
Ramao'ourvf iiapei
Cosmic Paifol (Tapei
Ccvsmic Pahoi iP
Dagger In Otb-t iTape»
Dragonauesl <Tape|
pragonqu^l idsM Model I
Dragono/uBSl iDisfc) Model Ml
Dr Chips (Tap&j
Flignl Palh^Tapei
The Flymg CirtuMDi&M
House of 30 Gables (Tape)
Jel Fighter Piioi |Tapei
Uasler R> Disk)

Nighi Flight tTapei
Oil Tycoon (Tapet

1 Pong i Tapej
San la Pi * ami 4 F<umacc<o (Tape*
Spate Shu Hie i Tape «

.imp Ait <Tap#|
Te*nfiie of the Sun i Tac^

THS-S0" HOME AND PERSONAL
OROERNO PROGRAM NAME
0D64R Muv i. Mastei 1 1

dl5iRD QSL V4"a^" -C i

PRICE
995
995
995

3*95

995

9 95

14 95

1995

U95

1595

; 155

2195

9 95

14 IS

39 95

9 95

14*35

2995

995

^495

995

M95

1995
29 95

PRICE
t995

APPLE' • EDUCATIONAL
ORDER NO PROGRAM NAME
0339AD I

O2B3A0 Ru^n" Di*k iD -

PRICE

34 95
24 95

APPLE

ORDER

gi-e

0161AD

0254AD

001 B A

0025 ft

00 79 A

Q163AD

00&OA

0T74A

D229AC

01BJA
0271AD

" GAMES. SIMULATIONS • ENTERTAINMENT

NO PROGRAM NAME PRICE

ft ■ r F U ghi Simutatio^ (Tape i 9 95

Appfe Fun (D 19 95

Df Chips <D 14 95

GeitcTapei 995

Mimic IT ape I 995

OH Tycoon iTapef 995

PatJrtle Fun (Disk* *9 95

Sahara Warriors (Tape* 9 95

SafitB Paravia £ Fiumaccro (Tap-Sf 9.95

Santa Pargvra & Fiumaccio (EV.h ■ 19 95

Sfcybombers |i (Tape) 9 95

SfcytKunpers II rDiski 19.95

Instant Software

APPLE" HOME AND PERSONAL

ORDER NO PROGRAM NAME PRICE

0235 AD Sola* Er»e*g> for the Home iQtsk} 34 95

0242AD Ailrolqqi tDiSUl 1095

PRICES SUBJECT TO CHANGE WITHOUT NOTICE

TO ORDER:

See your local instant Software dealer

or call loll free 1-800-258-5473 Depl A-63

In New Hampshire 1-603-924-7296 Dept. A-63

Mon -Ffi a 00 am -4 30 pm £ S
Include 2 50 for Shipping & Handling

Peterborough, N.H 03458 USA

A division of Wayne Green Inc

"TRS-80 Is a trademark of Radio Shack a division of Tandy Corporation
* " APPLE is a UademarK ot Apple Computer Inc.

Get a glimpse of the future today— at your nearest

Instant Software dealer.

CMP, PNomH
COMPUTER STORE. PfHWlhi
ME5A ELECTRONICS, Mail
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SWRTE*. T

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ADVANCED COMPUTER PflQGUCTS. Slflli Am
ALBAHV TYPEWRITER, AI«H*rw
aLLTHDNICS flan Jam

Bf*TE I

C*wnxcoMUTtii system*

ftirtTT rniiruTtinq. E> we*n

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COMPUSOUNB. Orinfl»
GOMPUSUP. Llnuilif

computea hart of California, inc ,

«MUTB*U«.I
COMPUTE STORE.!

oomavt** *o«tfl. '

JLAHCE i REPAjA.

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M A ELECTRIC Nwtmdtp

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73 Magazine * December, 198T 125

The Code Pet

a Morse tutorial for Commodore's com

Aiden Lamdowne AA&G
335 North Vassar
Wichita KS 67208

Program for Morse code.

YM jou're practically a
shoo-in for that up-
grade license if you can
copy the code from this
program written for the
Commodore Pet™. You
pick the speed from five to
twenty words per minute
and it sends perfect code in
groups of five characters.
Since this is a sound pro-
gram, you will need an ad-
dition to the Pet such as
can be found in Kilobaud
Microcomputing, Man h,
1979. The article by Greg-
ory Yob on page 71 ex-
plains several ways to con-
nect sound I strongly rec-
ommend the method in Fig.
4(b). By the time I isolated
an amplifier with capaci-
tors, I had distortion. The
transistor seems to be best
and also is easy to con-
struct.

After you enter the
speed, the screen is
blanked and you copy the

code with pencil and paper

as you would if you were
performing for the FCC.
After 100 groups of five
characters (or five min-
utes), the screen will show
the text sent A completely
random text of letters,
numbers, and common
punctuation will assure
you of receiving all charac-
ters equally

Should you wish to stop
before the computer is
finished, type S and the
computer will respond.
Code ts sent as near the in-
put speed as possible for
me to program. (If you
make improvements, please
let me know J The basis for
the time was reached by
running the program, tim-
ing for five minutes, and
then counting the groups
of five characters. Speeds
under 13 words per minute
are sent at 13 words per
minute with additional

IN PRItfT* WftSE CODE PROMPTER MQMtPH*

110 PRINT "QQI Mia SEMD MORSE CODE AT RAMDWIN"

12§ PftlNT GROUPS OF FIVE CHARACTERS AT THE"

130 PRINT "Q5PEED YOU DESIRE. AFTER 100 CROUPS OF*

140 PRIWT "^FlYE, A COPY DF THE SENT TEXT MILL*

150 PRI2TT 1JAPPEAH. IF YOU WISH TO STOP BEFOflE"

160 PfllJirpfH FINISHED, TYPE '%* mm

170 PRINT 1||IHAT SPEED MOULD YOU LIKE HE TO SEND?"

190 CLR

200 INPUT *5j(5 TO 2fl WPM)*;P

210 IF P<5 OR P>2ff THE?! 290

220 IF PH2 THEN K*l: GOTO 24*

230 Pt-ABS(P*I5§-I9ff): P*13

240 P-ABSIP'3-Bfl)

250 POKE 59409*52: REM TURN OFF VIDEO

260 pRiivr ■§■

279 PRINT "LETTERS. HERE fS THE LIST TO CHECK-

260 PRIST -YOUR ACCURACY #

290 POKE 59464,0: POKE 59467 , 16 :££H SOUND

300 POKE 59466,51

310 A-IIfTER«Din*47)+44

320 IF IA«*4} QR (*>57 WD A*£3) THEN 310

J10 PRINT OtRJIA);

340 FOR 1-44 TO A

350 READ AS

360 NEXT

370 FOR J-I TO P; WEFT

390 FOR 1-1 TO LEHIASJ

390 0I^IQSt«fttn

400 IF DS="L" THEN L*3*P: REM D/W LENGTH

410 IF DS^'S" THEN L»P: ft£M DIT LENGTH

420 POKE 59464,211: REM TONE

430 FOR J-I TO L: HEJCT J

440 POKE 59464.0

126 73 Magazine • December, 1981

spacing between charac-
ters. The timing for this is
accomplished in lines 220
through 240 Line 270 is in-
complete, but before the
screen is turned on, fine
610 will finish the sentence
and tell you how many
groups you have copied
Line 290 includes an extra
POKE statement; however;
without it, you would hear
a false tone the first time
you ran the program.

This program uses the in-
herent ASCII code in the

Pet to reference a number
to the corresponding ASCII
character for display. Line
320 removes the holes in
the ASCII code. Line 300
follows guidelines for
sound pitch as in Kilobaud
Microcomputing, Feb-

ruary, 1979, page 9 If the
tone is not right for you,
change the 211 in line 420
to any number between 1
and 255.

Line 600 turns the sound
off. If you have inadver-
tently pressed STOP, just
type RUN 600 You won't
see it on the screen until
you have pressed RETURN,
The program as shown will
run until 100 groups have
been sent. If you want to
copy for only five minutes,
add line 205 and change
line 560 as in Version II.

Learning code isn't al
ways that much fun, so
anything to ease us

through this period helps!
Good luck on the up-
grade, ■

450 NOT I

469 REM £MD OF LETTER, CHECK & GROUP

47^ RESTORE

m SET £$; IF ES-"S* BO 59#

49* C-C+l

5W IF OS THEN OH: GOTO 53P

510 FOR J-I TO K: NEXT: REH WORD SPACE

52* GOTO 310

531 FOR 1-1 TO P*6+2*£: UIXT

$4$ G-G+k H-H+l

5S0 IF 06 THEN G-0: GOTO 5B0

5$i IF H*1W THEN S9f

570 PRIHT " ■;

see GOTO 311

590 REM END

m POKE 59464,0: POKE 59466,0: POKE 59467,(1

610 FKMT ^TOU HAVE COPPIED^H^GROUPS OF FIVE*

621 POKE 59«i9,6fl

63* PRINT mSQ^mm^^fmjQ^

640 END

1100 DATA LLSSLULSSSl.SLSLSL.LSSLS

If IS DATA LLLUiSLLLL,SSLLLtSSSa,SSSSl,£SlSS,L5SSS,LLSSS.LLLSS,LLLLS

19Zf QATA 8,a,fl|B*&,SSLLS5#3

1930 DATA SL tL55S (LSL5 ,LSS fS ,SSLS ,LLS tS5SS ,55 ,SLLLtLSL ,SL5S ,U. ,1.5 »LLL ,SUS ,USL

1040 DATA SL5,S55,Ll5SLtSSSlt5LLfL5SLfL5LL,LL55

VERSIOH El ADDITION

205 Ml+iflttl

560 IF TDT THEN 590

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73 Magazine * December, 1981 127

Paul Crupp KA1LR
73 Magazine Staff

No More Two-Tone Sidetone

modify your AEA keyer

The AEA CK-1 and MM-1
are spectacularly versa-
tile keyers, and after many
months of using both of
them I have only one com-
plaint, a complaint that
many others have voiced.
The problem involves the
sidetone.

Let's face it — there aren't
many keyers with a nice
smooth sine-wave oscillator
for the sidetone. On the
other hand, most transceiv-
ers offer excellent sidetone
characteristics, Moreover,
when using the transceiv-
er's sidetone, you can avoid
the embarrassment of hav-
ing the keying cable go bad
while you are sending, or
[heaven forbid!) forgetting
to flip the "transmit"
switch. In both cases the
sidetone on your keyer
would percolate along hap-

pily, giving no indication of
the fault.

So what's the problem? If
you want to use the side-
tone in your rig rather than
the one on the keyer, you
can simply turn down the
volume control on the key-
er, right? Wrong! If you turn
down the volume control
on the keyer, you won't
hear the audible confirma-
tion of each entry you make
on the AEA's keypad. This
can lead to errors in mes-
sage loading and speed se-
lection if you don't depress
the keys firmly, or there is
key bounce.

The solution is ridicu-
lously simple, Unlimber

your soldering iron, and in
less than five minutes you'll
have your AEA keyer giving
you audible confirmation

of entry, but no sidetone.
We'll start with the CK-1,
since that keyer is nearest
and dearest to my heart.

Remove the two screws

on the sides of the keyer
and carefully separate the
two halves of the keyer. On
the circuit board, locate
diode D1, which can be
found next to U3, just south
of the 7805 regulator.
Check the pictorial in the
manual if you are not sure
that you have the right one.
Now here comes the hard
part. Brandish your solder-
ing iron threateningly be-
fore the keyer, and then un-
solder one end of the diode.
That's it! Tape the diode so
it doesn't short out any-
thing, and close up the
keyer.

The MM-1 is equally sim-

ple to modify. The diode of

interest in the MM-1 is the
D1, located near the crys-
tal. There are two diodes
and a resistor in a row; the
diode you're after is the sec-
ond one from the resistor
Unsolder one end of the
diode, and you'll have veri-
fication of key closure, but
sidetone only from the rig.
If you wish to use the
keyers sidetone from time
to time, you can simply in-
stall a miniature SPST tog-
gle switch to switch the
diode in when you want to
hear sidetone from the key-
er. In the MM-1, the switch
can fit in one of the holes
drilled for the Aux jacks
Space in the CK-1 is a little
tighter, so you'll have to
drill your own hole, but
there is still plenty of
room ■

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128 73 Magazine • December, 1981

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Monodes

harbinger of a new age

Everyone has doubtless
heard, at one time or an-
other, that there lurks at the
far fringes of electronics an
engineer's unicorn or will-
o'-the-wisp known as the
monode. Most of what you
have heard is humorous
and misleading in nature;
this is simply a cover for a
lack of hard facts.

But with recent develop-
ments promising to cata-
pult it squarely into the
limelight of the next wave
of innovation, it has come

time to broaden its ac-
quaintanceship. Engineers
and hobbyists alike stand to
benefit greatly. Both will
find the new information of
prime interest. We will now
proceed to unburden the
monode of its undeserved
myth of uselessness.

Monodes have left their
mark through much of early
history This fact is now
clearly seen from the new
perspectives given to us by
contemporary historians of
technology, notably Y.

Wat

Chchcn Ttz4

CoutUi* lUoki AriUives

Fig. 1. Representative ancient monodes.

130 73 Magaztne • December, 1981

Coyte Dunbar-Dexter and
Isadora Pisa Ferniccia.
Specimens of early ones
range from bits of copper
embedded endwise into
clay beads (Chichen Itza,
Angkor Wat) to bronze pin-
shaped leads in wooden
beads or buttons (Gizeh,
Jericho). Fig. 1 shows repre-
sentative pieces from these
sites, circa 2240 BC to 1680
BC.

This graphic argument
needs no further justifica-
tion. The ancients' failure
to extract a usable perfor-
mance from them, however,
led to their continual burial
and rediscovery in widely
scattered places and times.

There are historians who
scoff at the ancient mon-
odes theory, nonetheless.
Most often, these are not
technically oriented peo-
ple, and so they put forth
the rather tepid counter
that the so-called monodes
are often found in proxim-
ity to such commonplace
articles as combs and
brushes (who among the
present readership has not
built a Wimhurst or Van de
Graff machine?); some are
even found right in a mum-
mified corpse's hair!

We can scarcely blame
the ancients for burying
these defiant devices with
their frustrated and no
doubt defamed inventors,

perhaps wishing both a
kinder break in the after-
world.

In point of fact Puck's
Staff, as we might well call
it, had been a thorn in many
a Skyptickal Experimenter's
side all through the Renais-
sance, as welL The first rela-
tively modern mention of
them is found in a rough
draft of a neveMinished
monograph, as it identified
itself, by Evangelista Torri-
celli, in 1642, Fig. 2 shows
this work. He had a vague
notion that the strange
forces found in amber, ani-
mal fur, and the like had an
affinity for metals and pro-
ceeded to tackle electrode
theory one electrode at a
time.

Since an electrode's prin-
cipal characteristic seemed
to be its length, he assem-
bled one by putting mercu-
ry in a glass tube and invert-
ing it into a shallow dish of
more mercury. This was to
provide an easy means of
varying its length, but he
became so engrossed in the
tricks the atmosphere
played on it that he dropped
further dead-end research
in favor of the easier quar-
ry. He invented the barom-
eter the following year as a
result.

Benjamin Franklin also
delved into the matter for a

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73 Magazine * December, 1381 131

time This has been deter*
mined by piecing together
scattered interviews biog-
raphers held with younger
contemporaries after his
death. Franklin mounted
ball-capped rods atop Ley-
den jars (the now-familiar
ball and stem most static
electricity devices sport),
but found that, when
capped with wooden or gut-
ta-percha insulators as
monode theory calls for,
tKey became quite refrac-
tory to further experimenta-
tion. He, too, gave up in de-
spair Fig. 3 shows this relic
of the lackluster side of
science.

Many nineteenth century
luminaries also wrestled
with the "wicked one-
legged beastie/' as Samuel
Morse referred to it But,
with so many highly suc-
cessful endeavors proceed-
ing forth, this was scarcely a
time for championing the
lame ducks of technology.

Michael Faraday at-
tempted to derive the form
of the Tubes of Force he
would find around a mon-
ode. His subsequent ner-
vous breakdown forever
sealed off any chance of
knowing just how close he
may have come to the truth
of the matter. He became
so distracted that he could
only talk about irrelevant
trivia for years, never
touching on the subject for
a moment Research is also
in progress on the so-called
heavy metal poisoning that
afflicted Isaac Newton.

Heinrich Hertz came
much closer than anyone to
seeing the monode in its
own right. He attempted to
ascribe to most common ar-
rangements of matter a
"monopolar character'' to
account for the apparent
lack of omnipresent elec-
tromagnetic activity as ob-
servable in his day. He was
right, in that monodes do
not make antennas, and
vice versa. We will go into
this in more detail.

As twentieth century

physics unfolded, portray-
ing a world in defiance of
common sensibility, the
monode began to fall into
line as a viable entity in its
own right. Engineers and
scientists here at Bull Lab-
oratories have detailed its
operating principles, and
applications research is in
progress at a rapid pace,
aided by the sophisticated
support technologies avail-
able today,

The basic stumbling
block all along has been in
the current mode assumed
Both monodes and super-
conductors, therefore, ex*
hibit essentially surprising
behavior in the macroscop-
ic realm.

Rather than burden the
reader with quillets of
theory, we will here take
the more pragmatic and in-
tuitive approach and de-
scribe the appearance and
measurement of basic mon-
ode circuit parameters:

Voltage — Voltage is a
measure of electromotive
potential difference be-
tween two points. The volt-
age of a monode with re-
spect to any other point in a
circuit can be measured
readily enough, but the
one-lead device cannot
have a voltage drop as
such Monodes do not drop
voltage, so much as they
never pick it up,

Current — Current does
not flow in monodes in the
conventional sense. Kir-
choff's Law still applies,
however. The monode's
voltage with respect to any
other point in the circuit re-
mains constant as long as
currents flowing into the
monode are equal in magni
tude to the currents flowing
out. The fact that both flow
over the same lead simply
means that conventional
current meters register
nothing.

Resistance — Since this is
defined as voltage drop per
unit current we have a dou-
ble dilemma, as witnessed

;

PER EVftMCELISTVH TOtWICELLl/FI AD. 1142

P« Re

(lignum,)

E.E Bull-Private Collection

Fig, 2, Torricelli's investigation.

above. Is the monode's be-
havior independent of the
resistivity of its conductor?
Does it display a tempera-
ture coefficient of some
sort? And what about het-
erojunction effects? One
might well ask.

Ac measurements are al-
so difficult, Since there is
no externally definable cur-
rent, how can it alternate?
Ac monodies seemed a
doomed cause until the in-
vention of the alternating
source in 1936 by Bull Labo-
ratories founder General E.
Fuller Bull. See Fig. 4 for op-
erating details. Shown in
the inset is a modern equiv-
alent—an array of series
connected photovoltaic
cells is illuminated by an
LED and mounted on a
quartz crystal which is
made to oscillate by a con-
ventional oscillator circuit,

You might now see why
Hertz' original notion about

ac and monodes is true. If
we try to make a monode
antenna, say, by topping an
automobile radio antenna
with a decorative foam
ball, we are in reality going
to be receiving signals from
the lower segments of the
antenna, which act as un-
shielded conductors from
the radio's coax connector
to the top segment It is this
top segment which, togeth-
er with the foam ball, forms
the monode. Hoping to
force the top segment to
become a monode/antenna
by removing the lower seg-
ments is of no use Now, the
lower half of this segment is
needed to connect the up-
per half (the new monode)
to the coax connector. It is
this new unshielded con*
ductor, of course, which
picks up signals, Chopping
away until only the foam
ball remains, we at last see
how poorly monodes func*

132 73 Magazine * December, 1981

CROWN MICROPRODUCTS WISHES TO TAKE THIS OPPORTUNITY
TO SAY THANK YOU FOR YOUR SUPPORT. WE ENTERED THE RTTY
MARKET A LITTLE OVER A YEAR AND A HALF AGO WHEN WE IN-
TRODUCED THE ROM-I26 RTTY OPERATING SYSTEM AT THE DAYTON
HAMVENTION IN APRIL OF 1980. THE ACCEPTANCE OF THE ROM-U6 IN
THE RTTY FIELD WAS INSTANTANEOUS DESPITE SOME WELL ESTAB-
LISHED AND TOUGH COMPETITION.

AS WE REFLECT OVER THE PAST EIGHTEEN MONTHS, WE REALIZE THAT
WE MADE A FEW MISTAKES. YET YOUR PATIENCE AND ENCOURAGE-
MENT HELPED US OVER THOSE MISTAKES. FOR YOUR PATIENCE AND EN-
COURAGEMENT WE ARE VERY GRATEFUL.

CROWN MICROPRODUCTS WISHES YOU AND YOURS THE VERY
BEST DURING THIS CHRISTMAS SEASON. OUR DESIRE IS THAT THE TRUE
MEANING OF CHRISTMAS WILL BRING YOU PEACE AND FLAPPINESS NOT
ONLY DURING THIS SPECIAL HOLIDAY SEASON. BUT EVERY DAY
THROUGHOUT THE YEAR.

SHING YOU A VERY MERRY CHRISTMAS AND

A HAPPY NEW YEAR!

RAIG LARSEN, WA7HTN

GARY MARTIN, W7XT

CROUfl

PlicroProducIs

P O Box 892

Morysville, Washington 98270
(206) 659-4279

73 Magazine • December, 1981 133

Ml (HdAen.)

Clover*
foodl

or &iifta
Battkof

Sp^rh-fU^rJ'tmr

£*rt*

Fig, 3, Franklin's monodick apparatus.

tion as antennas.

The monode will see its
first gamut of applications
in the digital field, owing to
its highly unary truth table
and singularly consistent
characteristics. Indeed,
Buckminister Fuller has
dubbed the monode "the
unit of electrical behavior"

As an example of its al-
most trick logic, note Fig. 5,
the data bandwidth dou-
bles This feedthrough de-
vice is crimped onto strand-
ed hookup wire to increase
its pulse bandwidth and
functions as follows:

Logic ones are conven-
tionally communicated as
current pulses (Comple-
mentary codes exist, too;
we will stick to this one for
simplicity ,) These pulses ob-
viously must flow over the
low-resistance path offered
by the wire. Logic zeroes,
on the other hand, are rep-
resented by an absence of
current and thus obviously
prefer the hrgh-resistance
path formed by the two
100-megohm resistors in se-
ries, which prevent their be-
ing swamped by ones. Since
negligible current flows
over this path, the two mon-
odes terminate the path at

source and destination for a
healthy cost and weight
savings over twisted pairs
or coax.

Monodes now largely use
standard integrated circuit
technologies owing to their
availability However, new
and more appropriate vari-
ants are appearing, notably
5EAMOSS (Superinsulating
Epoxy And Metal Or Sub-
stantial Substitute), based
on the valence-filled NC (no
connection) junction.

Since monodes do not
use conventional current, it
must be bypassed. This was
done at first in the power
supply, using a hefty shunt
resistor and an air gap or
glass rod in series with the
output,

The development of the
powerless monode did
away with this, however.
This three-terminal device,
in addition to dissipating
heat from the bypassed cur-
rent, also dissipates "peat,"
or powerless heat, the zero-
energy equivalent of heat
dissipated by conventional
current Thus, in addition to
being mounted on an alu-
minum heat sink with sili-
cone grease, the device
must also be attached to a

ftUTifliutilJ

Fig. 4. Early and modern alternating sources,

transite pad with asbestos
grease, for peat's sake,

An even more recent de-
velopment, allowing mon-
ode ICs to be used in con-
ventional circuits, is the in-
corporation of bypass resis-
tors into the IC case. These
damp supply line ripple as
an added benefit, since of-
ten they have values on the
order of .03 Ohms or less.

The first digital monodies
research was done in 1967.
A team of Bull Laboratories
scientists theoretically pre-
dicted the properties of a
monode gate which they
proposed to call a "dis-
latch." Upon fabrication
and testing of the first unit,
however, it was deemed a
flop.

There are two kinds of
flop, J and K, which are
identical, which is simply to
add variety to texts on mon-
ode theory and practice.
Much of this would be
stodgy pottage, indeed,
without such details; the
phenomenon is known as
"monotony."

The flop possesses a
unique ability to keep cir-
cuit complexity to a mini-
mum. This is due to the fact

that the output is indepen-
dent of the input, folding its
truth table down to a mere
speck of ink on the printed
page and making it highly
noise-immune as well. The
distinction between ripple-
through and synchronous
logic becomes superfluous.

Some digital functions
served exclusively by the
monode and its MSI deriva-
tives include the Cunn Ef-
fect No-Shot Schmitt Trig-
ger; its output is a blank
when it is not loaded.

The flop is also the ideal
matrix element for the
WOM or Write-Only Mem-
ory. Far from being the
white elephant many wags
have painted it to be, it
finds many useful applica-
tions. It is usually function-
ally organized as a set of in-
terpenetrating spirals to
form a circular file or data
sink.

One use, which may have
far-reaching consequences,
is in the capacity of a data
terminator. Not knowing
the inherent capacity of the
Bit Bucket, which we must
assume on thermodynamic
grounds to be finite, it is
wise to provide for the dis-

134 73 Magazine ■ December, 1981

f - - i

iooriej

D <£

vWA-1

Nwtw rttntlArJ mortodt 100 fltQ

Bull UWvttones

Fig. 5, Data bandwidth doubters.

posal of spent data, rather
than simply spraying It into
the environment as noise.
Future generations of com-
puters will very likely be
planet-sized, if not larger,
and we are presented with
the horrifying spectre of
civilirations fighting over
caches of transition-free
space, Of course, this does
not even take into consider-
ation the cost of transport-
ing it to work sites once it is
staked out

In the early days of com*
puter technology, a pro-
grammer was as often as
not a jumper jockey, wiring
by hand the controller
boards used to program line
printers and the like. The
distinction between pro-
gram and data was painfully
clear. This separation is re-
ferred to as Harvard Archi-
tecture. Those who toiled at
these tasks may at least
console themselves that the
knowledge so gained has
been of great benefit in
present-day technology.
Many MSI integrated cir-
cuits are in reality not logic
circuits at all; like the con-
troller boards, they are
Readonly Memories. The
chip engineer's job in many

cases is reduced from te-
dious design-from-scratch
to literally writing functions
onto standardized ROM
formats.

With flop-based ICs, this
is destined to become an
even greater boon. Since
flop outputs do not follow
their inputs, many func-
tions to be written into
WOMs can be deleted with-
out any functional impair-
ment. This has been dubbed
Dropout Architecture.

It is not difficult to prove
that, using Dropout Archi-
tecture and conventional
ROM table-folding tech-
niques, WOMs can be pro-
gressively simplified to the
point that they will vanish,
making them extremely
compact and versatile. Of
course, There Ain't No Such
Thing As A Free Lunch, as
they say in the vernacular,
in most cases, the ICs sup-
ply bypass resistors will not
share in these logic-derived
benefits. Hefty power sup-
plies will thus remain the
rule, given the degree of
supply bypassing previous-
ly mentioned. Also, good
design practice will still call
for at least a label to indi-

Fig. 6 Vanished "Hop-flip" case WOM. Case design would

be unwieldy if chip existed.

cate the choice of WOM
not to be used. Fig. 6 shows
a vanished WOM as it may
appear and demonstrates
an unusual benefit of the
concept Proposed case
outline MO-223 is a "flop-
flip" case which can be not
used in either a dual-inline
or quad-inline circuit board
location,

Monodes entered the
linear realm in 1972 with
the invention of the Zero-
Current Source. It is real-
ized in chip form as two
powerless monodes in a to-
tem-pole arrangement, pro-
viding a 100% offset with
respect to both supply and
ground simultaneously.

This makes possible the
infinite-output-impedance
NOP-amp, which is ideally
suited for unity gain appli-
cations since the output im-
pedance matches the input
impedance. As long as no
disturbing input signal is
present, distortion is ex-
tremely low.

Other unique devices are
exemplified in designs now
on the drawing board at Na-
tionable Nonconductor, a
Bull Laboratories subsidiary.
For example, the NN3160

and NN3161 are, respec-
tively, a suppressed-lead-
ing-zero-to-analog convert-
er and its trail ing-zero sis-
ter The NN31246 is an In-
definitely Long Delay Line
or "Collander Brigade/' It is
actually a 1xN analog shift
WOM, of course. It is used
to shunt signal quiescent
periods away from sensing
circuit inputs.

A German research group
has recently achieved a
combination theory/prac-
tice coup with the develop-
ment of the C999, This
Gottdeschaft device is a tri-
ple negator and is used to
cast out nines in decimal
arithmetic units.

We can expect the mon-
ode to flood the market-
place soon, one-upping
many current two-lead de-
vices. With the prospect in
sight of a complete engi-
neering revolution, as Drop-
out Architecture's charac-
teristic philosophy of mate-
rial economy is applied to
many other disciplines,
physical technology itself
will become a thing to be
avoided. We will be ushered
into a new Eden and rejoice
in Eternal Oneness,!

73 Magazine • December, 1981 135

Michael
PO Box 245

Port Washington NY 11050

Breaking the Decibel Logjam

how to cope with nothingness

The purpose of this arti-
cle is to clarify what a
decibel is and to explain
why it acts the way it does.
The average amateur seems
to encounter difficulty
when studying the subject.
It is sometimes difficult to
grasp the decibel because
of its "nothingness/' It has
no weight, it cannot be
seen, and its taste and smell
are nonexistent.

Before going any further,
it might be well to state that
the decibel is a ratio, noth-
ing more and nothing less.
It merely represents the re-
lationship between two
quantities of energy. Unlike
the meter, the pound, or the
quart, it has no counterpart
in wood or metal in the Bu-
reau of Standards. It is an
arbitrary standard original-
ly set up by telephone engi-
neers for their convenience
in making measurements
and calculations.

The decibel is similar to
the old "transmission unit"
used for measuring the effi-
ciency of telephone cir-

136 73 Magazine • December

cuits. The original unit was
equal to the loss in a mile of
standard telephone cable
This mile of cable was used
to compare the losses or
gains in a circuit.

The mile of standard ca-
ble was too bulky to keep
around so it was replaced
by its electrical equivalent:
an artificial line with a resis-
tance of 88 Ohms and a ca-
pacitance of 0.054 uF. For
measuring purposes, the
combination of these units
was equal to a mile of stan-
dard cable, If the input to a
circuit was increased, the
amount of increase could
be measured by the number
of mile-units which had to
be inserted to bring the out-
put back to the original
level.

The greatest defect of
the mile of cable is that the
cable, having a certain
amount of inductance and
capacitance, does not have
a flat frequency response,
and transmission efficiency
depends upon frequency as
well as power, In working

1981

with new types of circuits,
there was a great need for a
new unit of transmission
which was independent of
frequency. One was needed
which was based on power
alone, since the gain or loss
in power is the true index of
efficiency.

Another measurement
scale was devised and the
basic unit of transmission,
by agreement among the
engineers, was the fee/. It
was given this name in hon-
or of Alexander Graham
Bell, the inventor of the
telephone. In common
practice, one tenth of this
fundamental unit is used; it
is called the decibel and
goes by the abbreviation
dB,

The decibel is a natural
unit based on the way our
ears respond to various
sound levels. We rate the
efficiency and power out-
put of apparatus in Watts,
but our ears do not respond
to sound energy the same
way a meter does. Instead
of responding in direct pro-
portion to the wattage, our

ears respond logarithmical-
ly with respect to the pow-
er.

For those who may have
become a bit doubtful
about their algebra, a little
review may be in order be-
fore continuing with the dis-
cussion.

Use of Logarithms

The common system of
logarithms uses ten as a
base. The logarithm of a
number is the power to
which ten, the base, must
be raised to equal the num-
ber. For example, ten
squared, or ten raised to the
second power (102), equals
100. Thus, the logarithm of
100 is 2, If we raise ten to
the third power, we have
1000 (10J = 1000k so the
logarithm of 1000 is 3.

The number which we
have just found is called the
characteristic of the loga-
rithm and always has a val-
ue of one less than the num-
ber of digits in the given
number. 1000 has four dig-
its and so the characteristic
of its logarithm is 3. Unless

the given number is a direct
power of 10, its logarithm
consists of the characteris-
tic followed by a decimal
number known as a mantis-
sa, which must be found by
use of a table of logarithms.
If we want to find the loga-
rithm of 775, we know that
the characteristic is one less
than the number of digits so
that makes it 2, By referring
to a log table we find the
mantissa to be ,8893 so the
log of 775 is 28893. This
means that if 10 were raised
to the 2.8893 power, the re-
sult would be 775. Numbers
may be multiplied by add-
ing their logarithms or they
may be divided by subtract-
ing their logarithms.

Returning to the discus-
sion of the decibel, suppose
we had an amplifier with an
even 1000 milliwatts out-
put If the output were re-
duced the least amount de-
tectable by a sensitive ear,
we would find that it had
been reduced to about 794
milliwatts, or to 0 794 of the
original power. If once
again the power were re-
duced the slightest amount
detectable by the ear (a
good ear) and the output
measured again, we would
find that the power had
been reduced to 0.794 of
the 794 milliwatts, or to
0 630 of the original power,
[f we go so far as to reduce
power another step, we find
that the power has been re-
duced to 500 milliwatts, or
to one-half of the original
amount. It took three steps
(reductions of power) to re-
duce the original power to
one-half its value.

The decibel, which is the
new unit of transmission or
power ratio, is supposed to
be the smallest change in
power that is audible to the
trained ear. The formula for
finding the decibel of a ra-
tio between two power lev-
els is: dB = 10 log10
(power,/power3).

Power 1 and power 2 rep-
resent power before and af-

*-Sae List of Adwftt*rs art page 162

ter it has been reduced or
increased. When substitut-
ing, if the larger of the two
is always placed on top, it
will simplify solution. If we
substitute 1000 milliwatts
for p! and 794 milliwatts for
p2, we will have the follow-
ing:
dB = 10 log, ,1000/794
= 10log101J59.

The log of 1.259 is 0.100,
sodB = 10 X 0.1, or, dB =
1

In substituting for the
second and third reduc-
tions, we find that we have
reductions of 2 and 3 dB, re-
spectively. This then gives
us an approximate scale
that is easy to remember:
One dB reduces the power
to 4/5ths of the original, two
dB reduces it to 2/3rds of
the original, and a reduc-
tion of three dB brings the
power down to one-half of
the original.

Practical Examples

If these power ratios are
memorized, almost any dB
loss or gain can be figured
quickly, For example, what
power ratio would be repre-
sented by a loss of 9 dB? A
9-dB loss would be the
same as three 3-d B losses
Remembering that a 3^dB
loss equals a power ratio of
1/2 and also remembering
that when the logarithms of
a number are added the
numbers are multiplied, we
find the following:

3dB + 3dB + 3dB
= 1/2 x 1/2 x 1/2 = 9dB

= power ratio of 1/8.

To find the power ratio of
a 7-dB loss we have the
same as a 3-d B, 3-d B, and
1-dB loss, so:

3dB + 3dB + 1 dB

= 1/2 X 1/2 x 4/5 = 7dB
= power ratio of 1/5.

When solving for gain,
the problem is figured for
an equivalent loss and the
resulting power ratio is in-
verted, For example, to find
the power ratio of a gain of
ten dB, we have to find a
change of 3 dB, 3 dB, 3 dB,

and 1 dB, so it follows that

3dB + 3dB + 3dB + 1 dB

= 1/2 X 1/2 X 1/2 x 4/5

= 10 dB = 1/10.

Inverting: 10 dB gain =

power ratio of 10.

This is another common
ratio that should be com-
mitted to memory, and it is
easy to remember 10 dB
equals a power ratio of 10

Voltage or Current Ratios

The formula so far has
been for finding the decibel
direct from the power mea-
surements. When voltage
or current readings are to
be used in place of power,
the formula must be
changed to read:

dB m 20\og^(y,fV2l

The power in a circuit is
proportional to the square
of the voltage or current. As
stated before, adding of the
logarithm of a number to
that of another multiplies
the numbers, so two times
the logarithm of the voltage

or current ratio squares it
and gives us the power ra-
tio. Current values may be
substituted for V1 and V2,
When using voltage or cur-
rent values in the formula it
is considered that the input
and output impedances are
the same.

By substituting in the for-
mula for power, we can
work out the following
table.

Decibels

Power

Gain

Ratio

1.25

100

1000

10000

By this we find that each
time the level in decibels is
increased by ten, the power
is multiplied by ten. To in-
crease the audio output of
a piece of equipment by 40
audible steps, or by 40 dB,
the power output must be
increased 10,000 times ■

Two-meter H.T. Amplifier Kit

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Class C or AB1

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QRO ENGINEERING UkSEaSi£107

MM HELP

I recently purchased an old
Hallicrafters linear amplifier,
Model HT 41. I need to get a
copy of the schematics and, if
possible, operating instruc-
tions. If anyone can furnish
these, I will gladly pay costs.
Thank you.

Glenn Churchill KA2IOI

1 Meadow Rd.

Hudson Falls NY 1 2839

I need a schematic for a Navy
RBH-2 general-coverage system
CNA46188 receiver manufac-
tured by National under its own
model number NC154M. I am
willing to pay a reasonable
amount for the schematic and
manual. Thank you.

Terron
9301 SW 4th St, 21 9

Miami FL 33174

73 Magazine • December, 1981 137

Less Drain Is Your Gain!

power-saving mods for the Wilson II and IV

Photos by N3IC

Scope display of power saver in action. Top trace — receiver power. Bottom trace-
squelch voltage.

138 73 Magazine • December, 1981

Robin Becker KAJW
2912 N> Calvert Street
Baltimore MD 21218

Wilson Mark II and
Mark (V hand-helds
are excellent performers. In
many ways, they rival the
premier Motorola HT-22Qs
One way in which the Wil-
son units come up short is
on standby current. Wilson
specifies the standby cur-
rent at 15 mA; mine draws
about 22 mA normally. A
call to the factory con-
firmed that this is par. While
respectable, 22 mA, or 15
mA for that matter, just
doesn't compare to the
HT-220's standby current of
3.5 mA. Recently, while
making a modification sug-
gested by Wilson to reduce
distortion in the audio
stages, I decided to do

something about this. The
result was a reduction of
the standby current to the
outstanding level of 4 mA.
Perhaps even more incredi-
ble, the modification re-
quires only about $2 worth
of parts and just a slight wir-
ing change to the circuit
board f The details of the
modification are described
below, along with two other
changes which conserve
power on receive and trans-
mit.

The basic idea behind the
modification is to switch
off the power to most of the
receiver as much of the
time as possible, switching
it on periodically for a brief
instant to check for a re-
ceived signal. When the re-
ceiver is powered up, the
presence of a quieted signal
keeps it on and the absence
of a signal turns it off again.
Once turned off, the receiv-
er is powered up again after
a delay and the process re-
peats If the turn-off occurs
quickly compared to the
time between successive
turn-ons, substantial power
savings result

To implement this idea,
logically it would seem that
checking the squelch volt-
age of the receiver would
be sufficient to determine if
a signal is present In fact,
this Is the scheme that most
scanners use to check for
busy channels. However, to
prevent noise bursts from
coming through, squelch
circuits open only after the
presence of a continuous
quieted signal for some
fixed time period. Wilson
set this time period to be
from 40 to 1 20 ms, depend-
ing on the squelch control
setting. The squelch action
of the Wilson HT is depict-
ed in Fig, 1, which shows the
voltage at the collector of
Q14 for various signal con*
ditions. If the squelch con-
trol is set as tight as possi-
ble, the receiver would
have to be powered for 120
ms before the squelch volt-
age would indicate the

presence of a signal. Thus
the minimum power-on
time would be about 120
ms.

To realize significant
power savings, the receiver
must be off for much longer
periods than it is on If the
receiver power-on period is
set to 120 ms, the power-off
period must be set to 1 sec-
ond or longer. This is not ac-
ceptable, since it results, on
average, in the loss of the
first 500 ms of any transmis-
sion. If the power-on period
could be shortened, how-
ever, the power-off period
could also be shortened,
and hence the amount of
any transmission that is
missed would be reduced
A power-on period of 10 ms
followed by a power-off
period of 200 ms, for exam-
ple, would result in the loss
of only 100 ms of signal on
average, while still reducing
power consumption consid-
erably, A loss of 100 ms cor-
responds to about one-half
of a syllable and is not sig-
nificant In fact this is com*
parable to the amount of

Top view of completed hoard,

signal lost in normal opera-
tion due to the response
time of the squelch circuit
(see Fig, 1 and note the time
delay from signal onset to
squelch opening).

Thus, to design a success-
ful power-saving circuit, a
method of reducing the re-
quired power-on time must
be found. Although the
squelch circuit of the re-
ceiver takes up to 1 20 ms to
open, it closes in at most 15
ms (the squelch circuit
closes in about 5 ms if the
squelch control is set as
tight as possible). There-
fore, if instead of waiting
for the squelch to open
when the receiver is pow-

ered, we instead somehow
start with the squelch open
and only wait for it to close,
the power-on periods could
be reduced to 15 ms or less.
This coupled with power-
off periods of 200 ms would
yield fairly fast response
and dramatic power sav-
ings Unfortunately, the
Wilson's squelch circuit al-
ways closes after the receiv-
er is powered. However, if
the squelch circuit itself is
always powered during re-
ceive and the rest of the re-
ceiver is powered up at in-
tervals of more than 120 ms
(the maximum time it takes
for the squelch to open),
then the squelch would

Tf$HT SQUllCH

NO SIGNAL

SQUELCH
VOLTAGE

SIGNAL-

NO SkGMAL

SQUELCH

LOOSE SQUELCH

SQUELCH
VOLTAGE

SQUELCH

i?Cmi

CLOSED

-* OPEN

CLOSED — *

5mi
CLOSED

•

OPEN

19 mi
CLOSED

Fig. 1 , Squelch action before modification.

73 Magazine • December, 1961 139

■™

Bottom view of completed board showing method of installation in HT.

always be open at the in-
stant that the receiver is
powered. The operation of
such a system is shown in
Fig 2.

Although the system now
seems complete, another
problem has been intro-
duced. Since the audio
stages are turned on and
draw power whenever the
squelch is open, some addi-
tional method must be used
to keep the audio stages
turned off during the time
when the squelch is open

and the receiver is not
powered. This problem
turns out to be easily over-
come by allowing the re-
ceiver power control signal
to act as an auxiliary
squelch control signal. In
this way, the squelch con-
trol signal is kept closed
when the receiver is not
powered. When the receiv-
er is powered, normal
squelch action controls the
audio stages.

A block diagram of the
circuit is shown in Fig 3

■MO SIGNAL

SIGNAL

^f»— NO SIGNAL

RECEIVER
POWfR

•^200 mi

SQUELCH
VOLTAGE

-I

JOO

-I

*-ZOO

SQUELCH -OPE

4 4-c-l- 4-

..-ii

OPEN

L_/L

*|* -| OPEN [*C

OPEN kCLOSCD

CLOSED CLOSED

CLOSED

Fig. Z Squelch action after modification.

SQUELCH
tMFUT

EQUELCH
fUTKFACE

200 mS
0**E-SHOT

RECEIVER
POWER

SWITCH

I fc*tf* SQUELCH 1 PTT

OUTPUT »»*UT

RECEIVER
PO*FR OUTPUT

Fig. 3. System block diagram.

The squelch interface con-
verts the squelch signal to
logic levels and to some ex-
tent duplicates the squelch
control stage of the HT
This is necessary because
the solution to the problem
mentioned above keeps the
receiver squelch control
stage clamped while the re-
ceiver is not powered. The
squelch interface circuit
triggers the one-shot when
the squelch closes. The one-
shot sets the length of the
power-off period. It also is
used to keep the audio
stages off during power-off
periods via the auxiliary
squelch output When the
one-shot is inactive and the
HT is in receive mode (PTT
is high), the receiver power
switch is closed and B+ is
applied to the receiver
When the one-shot fires or
when the HT goes into
transmit mode (PTT is low),
the power switch opens and
the receiver is turned off.

The complete circuit is
shown in Fig, 4. Transistor
Q1 converts the squelch
voltage to 0 - 12 volts. The<

one-shot is made from two
Schmitt- trigger NAND
gates, U1A and U1B These
gates are very useful for
fashioning one-shots and
oscillators, and the spare
gate can be used in some
future project. When the
output of U1B is low, it
shuts off the audio stages
through diode D2. U1C con-
trols the receiver power via
transistor Q2. The power
pulsing action can be dis-
abled by closing switch S1
This keeps Q1 off, prevent-
ing the one-shot from firing.

The entire circuit easily
fits into the area reserved
for a tone encoder. Con-
struction is quick using a
perfboard, and a suggested
parts layout is shown in Fig.
5. I soldered the IC directly
into the circuit although
the board might still fit if a
molex™ or a low-profile
socket is used. Both unused
gate inputs on U1 (pins 1
and 2) must be tied high or
grounded. I used 1/4 -Watt
resistors and tantalum ca-
pacitors because of their
small size. All parts are
readily available from
many suppliers. One sup-
plier is Digi-Key, PO Box
677, Thief River Falls MN
56701 i

The wiring is as follows:
Disconnect the wire from
the emitter of Q29 (upper
right of the circuit board) to
the junction of R5, R6, R9,
R11, R13, R14, and C46
(middle of the circuit
board) Connect + V on the
new board to the collector
of Q29 Connect the collec-
tor of Q2 on the new board
to the junction of the com-
ponents listed above. Con-
nect the PTT input on the
new board to the emitter of
Q29 Connect the squelch
input on the new board to
the collector of Q13 (near
the top of the circuit
board). Connect the auxilia-
ry squelch output of the
new board to the collector
of Q1 4 (upper left of the cir-
cuit board). Finally, con-
nect the ground on the new
board to the circuit board

140 73 Magazine * December, 1981

ground somewhere near
Q14 (the exact location is
not critical).

If the disable function is
desired, a small slide switch
can be mounted on the perf-
board. The switch should
be bonded to the board
(epoxy works fine). By cut-
ting a notch in the case
within the battery compart-
ment, the switch can be
conveniently reached with-
out disassembling the case.

Circuit operation can be
checked by observing the
one-shot output (pin 11 on
U1) on an oscilloscope.
With the HT turned on and
the squelch control fully
clockwise, a pulse train
should be observed. The
pulse should be high for
about 5 ms and low for
about 200 ms, Next, rotate
the squelch control to its
fully counterclockwise po-
sition. The one-shot output
should stay high and the re-
ceiver squelch should open.

If all is well, install the
perfboard in the HT. The
board may be glued in
place if desired, although I
have not found this to be
necessary Insulate the
perfboard from the circuit
board using cardboard,
foam, etc.

The completed unit
draws around 3.5 mA dur-
ing power-off periods and
normal receiver current (22
mA in my case) during pow-
er-on periods. With the
squelch control pegged, the
duty cycle is 5 percent or
so, and as a result the aver-
age current should be ap-
proximately 4.5 mA. Mea-
surement in the lab con-
firmed this figure. The HT
was also tested on a Cush-
man, and no change in re-
ceiver sensitivity was ob-
served when switching be-
tween pulse mode and nor-
mal mode.

Once installed, the oper-
ation of the circuit can be
verified by rotating the
squelch control until the
squelch threshold is just
reached. Periodic noise
pulses should be heard

50UELCH
INPUT

RECCWER
POWER OUTPUT

AUX SOUELCH
OUTPUT

from the speaker if the
squelch control is set right
on the edge between open
and closed. Otherwise,
you'll never know it's work-
ing unless you keep track of
how often your batteries
run downl

Now on to some changes
on the circuit board. These
changes are not that easy
and are only recommended
for those persons experi-
enced with tight circuit-
board work. Although the
changes only involve sub-
stitution of components,
access is difficult due to the
cramped quarters With a
little care they may be per-
formed successfully,

The first change further
reduces receiver standby
current drain, although on-
ly by a little more than 5
mA (from 4,5 to 4 mA).
Change R48 from 18k to
100k R50 should now be
adjusted so that the audio
output clips symmetrically.
A value of 270k worked for
me- A side effect of this
modification is that the
time it takes the squelch to
open is increased by about
20 ms+ C57 could be re-
duced to compensate for
this, but then the squelch
would close on shorter
noise pulses than it did
originally. I suggest leaving
C57 at 1 uF, since the added
time is not significant.
Although this modification
can be made without in-
stalling the power pulsing
circuitry, the benefit would
be marginal in that case.

The second change re-
duces transmit current by
about 20 mA. Change R93

Ui- CD*033 or Ut*093
PM T CHD

ptn W *V

Fig. 4. Power pa her schematic.

[ZjH

czn

Fig. 5. Parts layout top view.

from 470 to 4.7k. This
change cannot be made
unless the power pulsing
circuitry has been installed.
A similar savings in transmit
current can be achieved
without installing the
power pulser, however, at
the cost of about .7 V lower
receiver voltage, by chang-
ing Q29 to a Darlington
(such as an MPS A13) and
increasing R93 to 10k.

In conclusion, I see no
reason why the receiver
power pulsing idea could
not be adapted to other
HTs. For synthesized HTs,

power would have to be
maintained to the synthe-
sizer, since the lock-up
times are probably on the
order of 100 ms, Give it a
try!

Finally, I'd like to ac-
knowledge the help of
N3IC in kicking ideas
around, designing circuits,
and taking the photos, and
also thank N3TE for spark-
ing the whole process. ■

Reference

Wilson Mark It and Mark IV

Operation and Service Manual,
Wilson Electronics Corp., 1978.

Wew of switch cut-out in battery compartment.

73 Magazine • December. 1981 t41

Joel ischmann K9MLD
8204 North 93rd Si.
Milwaukee Wl 53224

A Positive Supply
with a Negative Chip

one way to solve the parts problem

From time to time you,
like myself, have gotten
into a situation where your
junk box just did not have
the right parts needed to
build a project. You found
yourself needing some criti-
cal components not imme-
diately available from the
parts store — or maybe it's
9:00 pmF Sunday night

Well, this is a story about
such a situation which I
wish to share with you.

One evening, while work-
ing on a new ATV trans-
mitter, I had a requirement
for a good regulated power
supply. A look into my junk
box revealed a shortage of
positive-reference regula-
tors.

Again, one of Edsel Mur-
phy's laws prevailed: "If
working on a new design,
the most critical part wit! be
missing." (Well, if that isn't
one of Murphy's laws, it

Fig. 1.

20VDC

F*r

Fig. 2.

142 73 Magazine • December, 1981

sure is one of mine.) Staring
into the junk box, I recog-
nized some LM-337 regula-
tors. This regulator is a neg-
ative-reference voltage
device, but did this matter?

I walked over to the
blackboard and quickly
drew a schematic of a neg-
ative-regulated supply (Fig.
1). It became obvious that
there was no reason not to
use it. I located the other
components needed for this
power supply — which I
was planning to make ad-
justable to 135 volts— and
laid out a breadboard.

While working on the
breadboard, certain bene-
fits of this type of design
suddenly became evident.
Notice in the schematic
that I have utilized collec-
tor feedback for good regu-
lation. (Of course, this re-
quired a more available
NPN transistor, as least as
far as my junk box is con-
cerned.) Now that is the first
plus. The second plus in this
design is the fact that we
can ground to the chassis
the collector of the pass
transistor (Fig, 2). Plus
number three: using a TO-3
package allowed me to
eliminate any need for iso-
lating the case of the pass
transistor as is required by

every other supply.

Wouldn't you think, with
all these pluses, that
although this supply uses a
negative regulator it should
come out plus? Hi!

In previous designs (see
"More Power to You/' 73,
August, 1979), I discussed
details of regulated sup-
plies, current limit, regula-
tors, crowbar circuits, etc. I
wish to keep this design
simple and very basic. With
that in mind, let's examine
it briefly.

The transformer is an
18-V, 4-Amp unit purchased
at Radio Shack (PN 273-
1514). Referring to Fig. 3, we
can see the calculations to
the rectifier assembly This
rectifier bridge is from Ra-
dio Shack (PN 276-1171)
and has a rating of 100 piv
at 4 Amps,

A good rule of thumb for
the filter capacitor is ap-
proximately 3000 uF per
Amp. With this 4-Amp sup-
ply, I paralleled four 3300-
uF units from my junk box

Referring to Fig, 4r we
can calculate the dissipa-
tion of the pass transistor to
determine the proper heat-
sink rating. Starting with a
dc level of 25 volts from the
unregulated supply and a
regulated output of 13.5 V,

(tVAC *I4*252VDC

J0VAC

F/g. 3. Full-wave bridge,
filtered and unregulated.

Z5VDC
UNREGULATED

E«« UHV> « ]LQi{>{ZAllfn ■ 23 WATTS

f ig. <

the difference voltage
across the pass transistor
will be 11.5 V The product
of the difference voltage
and the load current will be
the power dissipation, in
Watts, by the power tran-
sistor For example, 11.5 V
X 2 Amps {load current)
equals 23 Watts of heat in
the transistor With this in
mind, I would recommend
a 100-Watt power transistor
like Radio Shack's PN
276-2039. A companion
heat sink could be the
Radio Shack Universal {PN
276-1 361 ),

The remaining parts are
not magic. Any Yi-Watt
resistor can be used for the
regulator bias Due to the
fact that the supply was
designed for 4 Amps, the
LM-337 requires a heat sink
to handle about 3 Watts
(Radio Shack PN 276-1363).

The only cautions to be
exercised to keep the 3-lead
regulator stable are lead
length, wire routing, and
grounding. Ground loops
and stray current paths can
cause stability problems
resulting in the regulator
not functioning under load,
so lay out your package
carefully.

Edsel Murphy may have
the corner on the unusual-
situation market, but I have
the first on a negative com-
ing out positive!!

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73 Magazine • December, 1981 143

\981 INDEX

Compiled by:
Jell DeTray WB88TH
Tim Daniel N8RK

AMPLIFIERS

HA-202 GOES TO 220 MHZ
THE GREEN GALLON

ANTENNAS & PROPAGATION

FOUR-BAND MOBILE ANTENNA

TWO STATIONS, ONE ANTENNA

THE ZL/DF SPECIAL

FLEXI-PLANE ANTENNA

ROTATOR RESCUE MISSION

PERFECT PARABOLAS

TWO-METER ANTENNAS

THE 440-MHZ CURTAIN

PARABOLIC MOUNT

MULTIBAND GROUNDPLANE

DISH IT OUT

THE EARTH MOVER

SAILING THE TRIBAND SLOPER

STAY TUNED

INSIDE COAX

"NO ANTENNAS" ANTENNA

DIGITAL CONTROL FOR BAM III

ABOUT THE BEVERAGE

DESIGN-A-DISH

SHRINKING ANTENNA

THE CCD ANTENNA

THE BOBTAIL: ROUND THREE

QRM-PREE ANTENNA TUNING

SOLAR ALIGNMENT TOOL

THE BETTER VERTICAL

FOLDED UNIPOLE FOR 160

PROPAGATION PROPHECY

RINGO RANGER REDUX

TRAVELING HAM'S ANTENNA

ANTENNAS FOR BEGINNERS

"CHOPSTICK" HELICAL FOR 432

AMPLIFIER CONVERSION
811A LINEAR AMP PROJECT

SHARING SCHEME

TRANSMITTER HUNT ANTENNA

FOR 2-METER HT'S

BRAKE MOD

DISH DESIGN

OMNIDIRECTIONAL THEORY

TWO- BAY COLLINEAR

HYDRAULIC SYSTEM

OPEN WIRE FEED

PARABOLIC REFLECTOR

PARASITIC REFLECTORS

HALF -WAVES FOR BOATS

THREE TUNER PROJECTS

QUALITY AND CONSTRUCTION

INVISIBLE COAXIAL DIPOLE

MOD FOR HAM III ROTOR

RECEIVING ANTENNAS

BASIC PROGRAM: PARABOLICS

VERTICAL TOP HAT

THEORY PLUS Q & A

INVERTED BOBTAIL

INEXPENSIVE NOISE BRIDGE

FIND TRUE NORTH

ELEVATED FEED

TOP LOADED RADIATOR

CALCULATE THE MUF

ADDING RADIALS

COVERS ALL BANDS

NOT FOR NOVICES ONLY

GETTING READY FOR PHASE III

WA5VJB

OCT

W3BYM

OCT

K5PTC

JAN

129

WA4RRB, WB4INC

FEB

AD6Z

MAR

N1PL

MAR

K4GOK

APR

W4UFT

APR

WHS

MAY

WA90ZC

MAY

WD 4 MR J, KA4JYD

MAY

W1GV

MAY

W4NK

MAY

W8HXR

MAY

W8KXW

MAY

STAFF

MAY

WB6MMV/7

MAY

WA9BBX

MAY

WA0PBQ

JUN

W2XQ

JUN

W3KH

JUN

W1GV/4

JUL

W4FD, W4ATE

JUL

W6RCL

JUL

STAFF

AUG

K6BW

AUG

WD9AHH

AUG

WB6ZYK

OCT

AK0Q

OCT

W1HHF

OCT

137

W3JIP

NOV

100

N1II

DEC

9M2CR

DEC

116

ATV & SSTV

SLOW-SCAN BITS & BYTES
SSTV SIGNAL ANALYZER

MICROPROCESSOR & SSTV
CHECK YOUR SIG

K6AEP

K7YZZ

MAY

NOV

CB CONVERSIONS

CB TO 10 AND BEYOND

CB TO 10

CYBERNET TEN-METER OFFSET

CB-TO-10

USE WITH 432 TRANSVERTER
FART XXX: MIDLAND 13-866
REPEATER OFFSET
PART XXXI: SIMPLE OFFSETS

WB3CDE

MAR

GRANT

APR

104

K3NXU

AUG

WA7 ZGP

NOV

CONSTRUCTION PRACTICES

ALUMINUM COVERUP

FLEXIBLE COUPLINGS

HAM SHACK DESIGN FOR NOVICE

PAINTING ALUMINUM WB0YTH

COUPLING TWO CONTROL SHAFTS WB6GZW
TIPS FOR EVERYONE Nil I

MAR
JUL
NOV

62
90
42

CORRECTIONS AND FURTHER INFORMATION

"SINGLE-TONE PAGING FOR WILSON HTS" (DEC 80)
144 73 Magazine • December, 1981

JAN 160

tf
n

■i
ii

THE ODD COUPLE* (NOV 80)

THE SWEET SOUNDING PROBE" (JUL 80)

SUPER DUPER FOR FIELD DAY* (NOV 80)

TRACKER - THE ULTIMATE OSCAR FINDER" (JAN 81)

CB TO 10 - PART XXIX* (SEP 80)

S-F MOD KITS* (JAN 81)

A PROGRAMMER'S POTPOURRI" (SEP 80)

CHEAP AND SIMPLE" (JAN 81)

OPERATING OVERSEAS" (FEB 81)

THE EARTH MOVER" (MAY 81)

2L/DF SPECIAL* (MAR 81)

THE NICAD CONDITIONER* (APR 81)

MAYDAY 1" (JUN 81)

THE ROBOT 80 0H" (AUG 81)

QRM-FREE ANTENNA TUNING" (AUG 81)

KENWOOD'S TR-9000" (AUG 81)

THAT THEY MIGHT COMMUNICATE" (SEP 81)

THE CONTEST COOKBOOK" (SEP 81)

CONTROLLED CHAOS" (OCT 81)

FOLDED UNI POLE FOR 160" (OCT 81)

TRS-80: YOUR ELECTRONIC BRASSPOUNDER" (SEP 81)

FEB

124

MAR

106

MAR

106

MAR

106

MAR

106

APR

JUL

141

JUL

141

JUL

141

AUG

137

AUG

137

SEP

119

SEP

119

NOV

161

NOV

161

NOV

161

NOV

161

DEC

168

DEC

193

SUPERNOVA STATION ORGANIZER

ELECTRONIC BRASSPOUNDER

KEYER MAGIC

CW MUSIC KEYBOARD UPDATE

THE CODE PET

NO MORE TWO-TONE SIDETONE

QRP ACCESSORY

CW FOR LEVEL I TRS-80

ALL TTL CW KEYER

A GOOD DESIGN GETS BETTER

CW ON YOUR COMMODORE

AEA KEYER IMPROVEMENT

W3BYM

N0AGX

N5DY

K5KL

AA0G

KA1LR

AUG

SEP

OCT

DEC

126

DEC

128

EQUIPMENT MODIFICATIONS

POWER PLUS FOR THE OMNI
OFFSETS FOR THE KDK-2015R
A PATCH FOR THE TS-120S
BETTER PILOT LIGHTS
TR-7400 BEHIND BARS
END TO REPEATER TIMEOUTS
LIGHT-OPERATED RELAY
ROTATOR RESCUE MISSION
HELP FOR THE HW-2036
TOUCH-TUNE

DIGITAL CONTROL FOR HAM III
MAXIMIZE THAT MULTIMETER
ICING ON THE IC-2A CAKE
IC-2A ACCESSORIES
TRICK ING-OUT THE FT-901/902
HA-202 GOES TO 220 MHZ
MORE PUNCH FOR THE HW-101
NEW HORIZONS FOR THE HW-8
NEW FREQS. FOR THE IC-2
MODS FOR THE CLIPPERTON-L
AX-190 UPGRADE
ACCURACY FOR HEATH CLOCKS
NO MORE TWO-TONE SIDETONE
LESS DRAIN IS YOUR GAIN!

IMPROVING THE POWER SUPPLY

ODDBALL SPLITS

PHONE PATCH MOD

LEDS FOR THE T-599D

S-METER MOD

CIRCUIT FOR IC-211

USES CHANNEL BUSY LIGHT

BRAKE MOD

HUM MODS

TACTILE TUNING FOR THE TR-4

MOD FOR HAM III ROTOR

MODS FOR HEATH IM-17

NONSTANDARD OFFSETS

BUILD THEM YOURSELF

YABSU MODS

AMPLIFIER CONVERSION

ADD A MICROPHONE PREAMP

EXPANDED FREQUENCY COVERAGE

MARS CHANNELS

IMPROVEMENTS

USES COLLINS COMPONENTS

REDUCES SETTING ERRORS

AEA KEYER IMPROVEMENT

POWER SAVERS FOR WILSON

HA4 I QQ

JAN

WB6MYF

JAN

W5JJ

FEB

K4ZHM

FEB

WB3ATP

MAR

VP2EZ

MAR

PY2AUC

MAR

K4GOK

APR

K8KUZ

APR

AA3S

MAY

WA0PBQ

JUN

STAFF

JUN

WA4TEM

JUL

AD5X

AUG

W4ZCB, N4ML

SEP

WA5VJB

OCT

K5SE

OCT

WlPQ

OCT

112

KS4B/NNN0BKS

OCT

113

K4JW

NOV

VE7DLU

NOV

118

N5AEN

NOV

124

KA1LR

DEC

128

KA3W

DEC

138

GADGETS

EMERGENCY TONE ALERT SYSTEM
WWV-TO- 8 0 -METER CONVERTER
UNPLUG IT, DUMMY I
LINE NOISE SUPPRESSOR
TRANSMITTER TUNE- UP AID
A $10 PHONE PATCH
A 60-HZ FREQUENCY MONITOR
A 49-MHZ REPEATER
THE NICAD CONDITIONER

CAMPER POWER ALARM

AUDIBLE POWER OUT INDICATOR

LICENSE-FREE CB

RIDS NICADS OF MEMORY

WB5UVC ET AL.

JAN

N7BH

JAN

WB9SKX

JAN

WA4PYQ

JAN

WA4LBX

JAN

120

NlII

FEB

K0YMJ

FEB

KL7GLK

MAR

W2KPE

APR

106

73 Magazine » December, 1981 145

TOUCH-TUNE
820S REMOTE VFO

TACTILE TUNING FOR THE TR-4
BUILD IT

AA35

VE5PZ

HAY

JUN

54
84

HISTORY

OVER THE HUMP; INTO HISTORY

THE HISTORY OF HAM RADIO

DXING THE PAST

THE HISTORY OF HAM RADIO

AERIAL HEIRLOOMS

THE HISTORY OF HAM RADIO

WW II AVIONICS
PART XII: 1924-1925
VISIT TO SIGNAL HILL
PART XIII: THE OLD MAN
PART XIV: 1925-1926
PART XV: 1926
PART XVI: 1920-1924
EARLY RADIO TOWERS
PART XVII: 1926-1927

RITCHEY

JAN

W9CI

MAR

VE3CXL

MAR

W9CI

APR

W9CI

MAY

W9CI

JUN

W9CI

JUL

AK0Q

JUL

W9CI

AUG

HUMOR

HOME-BREW IN THE REAL WORLD

MY INFERNAL TOWER

MONODES

CONSTRUCTION HUMOR

WB1GVU

MAR

ANTENNA HUMOR

KC7M

APR

DAWN OF AN ERA?

CORNE R

DEC

130

I/O

TRACKER - THE OSCAR FINDER

LOGIC PROBE

UNDER SOFTWARE CONTROL

REAL-WORLD CONNECTION

APPLES: FIVE BITS OR EIGHT

SLOW-SCAN BITS & BYTES

DESIGN-A-DISH

RALLYING THE HP- 5 5

A STOUT HEART

ELECTRONIC BRASSPOUNDER

DIGITAL DEFENDER

KIM'S MAGIC FINGERS

THE CODE PET

TRS-80 PROGRAM

REPEATER CONTROL
I/O PORTS FOR TRS-80
RTTY FOR THE APPLE
MICROPROCESSOR & SSTV
BASIC PROGRAM: PARABOLIC S
CALCULATOR PROGRAM
KIM-1 SIMPLEX AUTOPATCH
CW FOR LEVEL I TRS-80
HAM SHACK SECURITY
RTTY TRANSMIT PROGRAM
CW ON YOUR COMMODORE

WD8DRK,

VERGONA

WD8CHH

K6EW

WB6MEP

K6AEP

W3KH

LUTZ

WD8CHH

N0AGX

W7CRY

VE1AKL

AA0G

K8UR

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

116

NOV

112

DEC

126

MISCELLANEOUS

DIRECT-PRINTING FAX

THE STRANGE PREDICAMENT

VHF CONTESTING

SELL 'EM WITH SLIDES

SUCCESSFUL HAM CLASSES

HOW FCC RULES ARE MADE

AN OPERATING CONSOLE

LIGHT-OPERATED RELAY

IN THE STACK

ALL THE NEWS THAT FITS

THE HONEYMOON IS OVER

DF BREAKTHROUGH

PLAIN LANGUAGE RULES

DAYTON DILEMMA '81

GRANDMA PACKS A SEABAG

WILD TURKEYS 1, FBI 0

SAILPLANES ON SIX

SOLAR ALIGNMENT TOOL

NEWCOMER TO NICADS?

FREE PR FOR HAM RADIO!

THAT THEY MIGHT COMMUNICATE

TED GAMLIN, A CONTESTER

RADIO REHAB

LLOYD AND IRIS COLVIN

A VISIT WITH SV0AY

X-BAND SWEPT SIGNAL SOURCE

EYEBALL QSO WITH RADIO RSA

JOE HAM: THE CONSUMER

PART III

ILLEGAL LISTENING-OE8WHK

W1FC AND W8DJY

A/V SHOWS

GUIDE FOR ORGANIZERS

THROUGH THE LABYRINTHE

DESK CONSTRUCTION

USES CHANNEL BUSY LIGHT

SIX METER RADIO CONTROL

CLUB NEWSLETTER

HINTS FOR HAM HUSBANDS

DIRECTION-FINDING SYSTEM

FCC PROPOSAL DETAILED

NEW GEAR: DAYTON HAMVENTION

MERCHANT MARINE RADIO

REPEATER JAMMING

RADIO CONTROLLED GLIDERS

FIND TRUE NORTH

INFORMATIVE OVERVIEW

NEWS MEDIA COOPERATION

HANDICAPPED HAMMING

PERSONALITY PROFILE

HELPING YOUNG OFFENDERS

PERSONALITY PROFILE

AN EXOTIC QTH

ONE FOR THE ROAD

VOICE OF SOUTH AFRICA

THE AVERAGE HAM

WB8DQT

JAN

WA4PYQ

JAN

N8RK

JAN

100

N8BPI

JAN

104

WB1FOD

FEB

WD4DAZ

FEB

W8GI

FEB

PY2AOC

MAR

WB3BQO

APR

N9YL

APR

HR1ADF

APR

W7BEP

JUN

N8RK

JUN

125

KA1LR

JUL

K7NZA

JUL

102

WA7UDO

AUG

WB3BQO

AUG

K6BW

AUG

W60JF

AUG

100

WD4NEK

SEP

K7NZA

SEP

KA1D

OCT

WA6VIP

OCT

KAlD

OCT

132

N1BEP

NOV

WlSNN

NOV

PETERSON

NOV

N6AVU

DEC

146 73 Magazine * December. 1981

MOBILE & PORTABLE OPERATION

FOUR-BAND MOBILE ANTENNA
DAZE OF WHINE AND NOISES
SAILING THE TRIBAND SLOPER
FLIER'S GUIDE
TRAVELING HAM'S ANTENNA
COLD COMFORT

IGNITION NOISE

HALF -WAVES FOR BOATS

AERONAUTICAL MOBILE

COVERS ALL BANDS

WINTER HIKING WITH AN HT

K5PTC

JAN

129

K2PMA

JAN

146

W8KXW

MAY

WB6BHI

AUG

W3JIP

NOV

100

KA1D

DEC

NEW PRODUCT ANNOUNCEMENTS

ADVANCED ANALOG SYSTEMS

AEA

ABA

ALUMA TOWER

ARP

AVANTI COMMUNICATIONS

BENJ. MICHAEL INDUSTRIES

BILAL COMPANY

CENTURY ELECTRONICS

CHARLESWATER PRODUCTS

CIRCUIT ELECTRONICS INC.

COLTON CREATORS, INC.

COMM. ELEC. SPECIALTIES

COMMSOFT

COMMSOPT

COMMUNICATIONS SPECIALISTS

CORNELL-DUBILIER

COVOX COMPANY

CUBIC CORP.

CURTIS ELECTRO DEVICES

DATAK CORP.

DESCO INDUSTRIES

ELECTRA

ELECTRONIC SPECIALISTS

FAXSCAN, INC.

GEORGE RISK INDUSTRIES

GROVE ENTERPRISES

HAMTRONICS

HEATH COMPANY

HUSTLER

HY-GAIN DIVISION OF TELEX

ICOM AMERICA, INC.

INDIANA QUICK CHARGE

INOTEK ENGINEERING

J. W« MILLER

JAMECO ELECTRONICS

KANTRONICS

KILOVAC CORP.

M & M ELECTRONICS

H-SQUARED ENGINEERING

MACROTRONICS

MANHATTAN SOFTWARE

MATSUSHITA

REMOTE CONTROL SYSTEM
PFDF RADIO DIRECTION FINDER
CW/BAUDOT/ASCII READER
HEAVY DUTY TOWER
AMATEUR RADIO PROFILES
450 MHZ MOBILE ANTENNA
17 3 A STATION CLOCK
17 3D PRESENTATION CLOCK
MODEL 273 CLOCK
MILITARY-TIME CLOCK
ISOTRON ANTENNAS
GL-25 RESISTOR KIT
CONDUCTIVE WRIST STRAP
SQUELCH TAIL ELIMINATOR
EZ CORD CONTROL
ENCODING MICROPAD
CW89 SOFTWARE PACKAGE
CODEM CW INTERFACE
TONE ENCODER FOR IC-2AT
HAM-SP ROTOR

MODEL I VOICE CONTROLLER

ASTRO C HF TRANSCEIVER

FIVE MODE KEYBOARD

804 4M SPEEDKETER

8044 KEYER CHIP

LIL1 BUGGER KEYER

FLEXY-MARKER

PRECISION TWEEZER

BEARCAT 100 SCANNER

ELECTRICAL POLUTION CONTROL

BP-3 BEEPER

KEYBOARD CATALOG

10 KHZ-30 MHZ ANTENNA TUNER

CODE BREAKER DESCRAMBLER

UHF EXCITER & 2M XVERTER

VHF/UHF/OSCAR CATALOG

REPEATER MODULES

VHF FM TRANSCEIVERS

OP AMP INSTRUCTION PACKAGE

512 MHZ FREQ CONVERTER

GU-1820 PORTABLE GENERATOR

SA-5010 MEMORY KEYER

TEN-METER YAGI

CRANKUP TOWERS

V- DOUBLE ZEPP ANTENNA

TRAILS RED TOWERS

IC-3A/IC-3AT 220 MHZ HT

QC500 NICAD CHARGER

CW EXAM PACKAGE

SIMPLE TUNER

AUTOMATIC ANTENNA TUNER

DUAL VOLTAGE POWER SUPPLY

VARIFILTER

MICROWAVE TRANSFER RELAY

MSB-1 AUDIO FILTER

HANDI-CON V VHF CONVERTER

MAILBOX RTTY SYSTEM

QSO LOG

BONE-CONDUCTION HEARING AID

JUN

107

JUN

105

NOV

170

APR

123

JUL

136

MAY

121

JAN

FEB

JUL

OCT

168

OCT

167

JUL

138

JUN

105

MAR

AUG

129

DEC

189

DEC

190

DEC

189

DEC

189

FEB

120

SEP

144

NOV

171

MAR

107

JUN

106

NOV

169

DEC

188

SEP

145

APR

122

SEP

144

APR

122

AUG

129

AUG

128

MAY

122

JUN

105

FEB

SEP

146

OCT

166

NOV

170

JAN

MAR

JUL

136

OCT

168

MAY

120

APR

123

AUG

130

SEP

145

DEC

189

SEP

146

OCT

169

NOV

168

FEB

JUL

138

JAN

AUG

128

MAY

121

OCT

170

JUL

135

NOV

168

OCT

166

73 Magazine • December, 1961 147

MCM COMMUNICATIONS
MCM COMMUNICATIONS
MCM COMMUNICATIONS

Mr J

MFJ

MICRO-80

MICRQCRAFT CORP.

MIRAGE COMM, EQUIP,

MOTOROLA

NON-LINEAR SYSTEMS

NORDAL ELECTRONICS

OK MACHINE k TOOL CO,

PALOMAR ENGINEERS

PHILADELPHIA RESIN CORP,

PLAINVIEW ELECTRONICS

PLYTUBE CORP. OF AMERICA

POLY PHASER CORP.

R.L. DRAKE

RADIO SHACK

RCA

RICKER EQUIPMENT

ROBERT LULY ASSOCIATES

SABTRONICS INTERNATIONAL

SCIENTIFIC DIMENSIONS INC.

SGL WABER

SPECTRUM INTERNATIONAL

STANDARD COMMUNICATIONS

SWITCHCRAFT

TELTONE

TEMPO

TEN-TEC

TRAC ELECTRONICS

TRANS COM, INC.

TRI-EX TOWER CORP.

UNIVERSAL ELECTRONICS

VALOR ENTERPRISES

VARIAN EI MAC

VECTOR ELECTRONICS

WRAASE(KW CONTROL SYS.)

YAESU ELECTRONICS CORP.

DAIWA CNA-2002 ANT. TUNER

DAIWA INFRARED CORDLESS MIC

CNW-518 & CNW-218 TUNERS

HF WATTMETER

KEYBOARD/KEYER

VHF WATT/SWR METER

3-KW TUNER

P0LICE/FIRE EXPLORER

CW COMPUTER INTERFACE

VLF CONVERTERS

SUPER LOG II PROGRAM

MORSE-A-KEYER

ALL-MODE 43 0-450 MHZ AMP

FM IF CIRCUIT

HYBRID COMPONENTS DATA BOOK

TOUCH TEST 20 DMM

ALUMINUM BOXES

IC DISPENSER

1750 METER TRANSMITTER

TRANSCEIVER PREAMPLIFIER

PORTABLE 2M QUAD

TOWER GUYS

LITHIUM BATTERY CATALOG

TUBULAR PLYWOOD

ZAP TRAPPER

ESR 24 EARTH STATION RCVR,

INSTANT-TUNING WEATHERADIO

VP-3301 DATA TERMINAL

SHACK DESK

LULY POLARIZER

MODEL 2020 DMM

MOBILE RADIO SLIDE MOUNT

POWER MASTER LINE MONITORS

MMS1 MORSETALKER TUTOR

TALKMAN TWO-WAY RADIO

CONNECTOR CATALOG

M-927 TOUCHTONE DECODER

S~4 440 MHZ HT

AIR COOLED DUMMY LOAD

200 -WATT ANTENNA TUNER

CW PROCESSOR AND KEYER

TUNABLE CTCSS ENCODER

120' ROTATING TOWER

COAX SEAL

COMM-X ANTENNAS

OMNI-GAIN BASE ANTENNAS

OMNI-GAIN MOBILE ANTENNA

TUBE SOCKET REPAIR KITS

BREADBOARD MATERIALS

SC-422 SCAN CONVERTER

FT-480R 2M TRANSCEIVER

FT-902DM HF TRANSCEIVER

SEP

143

OCT

168

NOV

168

APR

122

APR

MAY

121

MAY

120

JUN

106

NOV

169

DEC

189

MAY

120

SEP

145

OCT

169

JUN

106

OCT

169

JAN

156

JUN

106

JAN

156

FEB

120

JUL

137

MAR

107

JUL

137

SEP

145

MAY

120

NOV

169

SEP

144

AUG

128

NOV

169

DEC

188

DEC

190

AUG

130

JUL

138

NOV

170

DEC

188

JUN

107

MAR

107

APR

122

FEB

MAR

JUL

136

JUL

137

AUG

129

MAR

107

MAY

120

MAY

121

JUL

137

DEC

190

MAR

JAN

FEB

APR

122

OPERATING

OLYMPICS TORCH RUN

FEELIN" NO PAIN

OPERATING OVERSEAS

DXING THE PAST

THE RACER'S EDGE

BATTLEWAGON

REPEATER AT 102,000 FEET

MAYDAY I

THE DX PRIMER

10,000 QSOS FROM EASTER IS

A VERY "SPECIAL* WEEKEND

EMERGENCY PREPAREDNESS

A LOT OF HOT AIR

DX PROGRAM ROUNDUP

CONTESTING FROM VPS

HAM RADIOS ROLE
QRZ FROM LUCKENBACB
LICENSING FACTS
VISIT TO SIGNAL HILL
SOAP BOX DERBY OPERATION
MINI-EXPEDITION: USS TEXAS
BALLOON REPEATER
LOCATING DOWNED AIRCRAFT
OPERATING TECHNIQUES
DXPEDITION STORY
HAMS & THE SPECIAL OLYMPICS
GET SET FOR THE REAL THING
BALLOON RACE COORDINATION
DX NEWS ON THE SWL BANDS
TURKS & CAICOS DXPEDITION

KA2CNN, KA2DBW

FEB

W5QJM

FEB

A2CPS

FEB

VE3CXL

MAR

WD8JOI

APR

WD 5 ICY

MAY

VE4FK

JUN

W2FJT ET AL.

JUN

W8YA

AUG

K4ESQ

SEP

WB2CMB

SEP

WA3REY

SEP

WB6JBI

SEP

PETERSON

SEP

WB8BTH

OCT

148 73 Magazine * December, 1981

THE WINNING
CONTROLLED CHAOS
THE CONTEST COOKBOOK
THE 160 WINNERS!
TEN-METER LUNCH HOUR

LIFE OF A CONTESTER
STATE QSO PARTIES
BASIC STRATEGY AND TACTICS
160 METER CONTEST RESULTS
HAM RADIO FOR SCHOOL KIDS

WA3FUV

OCT

W2XQ

OCT

N60P

OCT

KE7C

NOV

131

WA8WTE

NOV

158

POWER SUPPLIES

CHEAP AND SIMPLE

UNPLUG IT, DUMMY I

LINE NOISE SUPPRESSOR

THE POWER WASTER

QRZ SUNSHINE

HALF A LOAF

THREE-WAY POWER SUPPLY

THE NICAD CONDITIONER

NEWCOMER TO NIC ADS?

BATTERY CHECK 1

POS. SUPPLY WITB NEG. CHIP

13.8-V, 25-A POWER SUPPLY
CAMPER POWER ALARM

ADJUSTABLE LOAD
SOLAR-POWERED REPEATER
6-V BATTERY CHARGER
VARIABLE OUTPUT
RIDS NICADS OF MEMORY
INFORMATIVE OVERVIEW
TESTING NICADS
SOLVING A PARTS DILEMMA

WA9VLK

JAN

WB9SKX

JAN

WA4PYQ

JAN

K6IQL

JAN

108

WB3HXY

JAN

114

NORDGREN

MAR

W3HB

MAR

W2KPE

APR

106

W60JF

AUG

100

PS7ZAD

NOV

K9MLD

DEC

142

RECEIVING

THE FUN-CEIVER

COMPANION TO FEB'S QRP XMTR WA0RBR

JUL

REPEATERS

REPEATER "REP"

QRZ SUNSHINE

SUB AUDIBLE TONE ENCODERS

ADD RTTY TO YOUR REPEATER

UNDER SOFTWARE CONTROL

A 49-MHZ REPEATER

LAST PL GENERATOR

END TO REPEATER TIMEOUTS

REPEATER AT 102,000 FEET

MAYDAY I

AMATEUR TELEMETRY

A STOUT HEART

2M GETTING A LITTLE BORING?

CARTOGRAPHY FOR KERCHUNKERS

AUTOPATCH DIALER
SOLAR-POWERED REPEATER
INSTALLATION TIPS
VOICE OPERATION, TOO
REPEATER CONTROL
LICENSE-FREE CB
TONE SYNTHESIZER
CIRCUIT FOR IC-211
BALLOON REPEATER
LOCATING DOWNED AIRCRAFT
REMOTE REPEATER MONITOR
KIM-1 SIMPLEX AUTOPATCH
TRY CROSSBAND DXING
MAKING REPEATER MAPS

K4ALS

JAN

WB3HXY

JAN

114

WA7LMO/N6XB

JAN

126

WB4EMI

FEB

WD8CHH

FEB

KL7GLK

MAR

WB2BWJ

MAR

VP2EZ

MAK

VE4FK

JUN

W2FJT ET AL.

JON

W2FPP

JUL

WD8CHH

AUG

WA3REY

SEP

W4FXE

NOV

156

REVIEWS

ACE
AEA

AED ELECTRONICS

ARRL

A V ANT I

AZDEN

BASH EDUCATIONAL SERVICES

BECKHAN

BENJ. MICHAEL INDUSTRIES

BREHN CORP.

BUTTERNUT ELECTRONICS

CALECTRO

COLOGNE PRESS

COMM. ELEC. SPECIALTIES

CROWN HICROPRODUCTS

CUSHCRAFT

DAIWA

DATONG

DOPPLER SYSTEMS

ELECTRA

GENERAL ELECTRIC

SYNTHESIZED VHP TRANSCEIVER

CK-1 MORSE KEYER

AED SCANNERS

ARRL OPERATING MANUAL

ARRL LICENSE MANUAL

10-METER QUAD

PCS-3000 TWO METER RIG

IDIOT'S GUIDE TO DX

310 DIGITAL MULTIMETER

24-HOUR CLOCK

HOW TO DEFEND AGAINST RADAR

HF5V-III VERTICAL

MULTI -TESTER VOM

AMATEUR RADIO, SUPER HOBBY 1

SIMPLEX AUTOPATCH

ROM-116 RTTY INTERFACE

SKYWALRER MONO BAND BEAMS

INFRARED WIRELESS MIKE

ASP SPEECH PROCESSOR

THE DOPPLER SYSTEMS DDF3003

BEARCAT 350 SCANNER

PROGRAMMABLE CLOCK RADIO

W8FX

DEC

KAlLR

JAN

WB6SMD

JAN

RAID

FEB

118

N8RK

JUL

AE3S

MAY

WA2JSR

MAY

AG9V/1

NOV

CLAWSON

APR

126

W1XU

MAR

N8RR

AUG

KA1LR

AUG

W8FX

AUG

KA1D

JUN

KA1LR

JUN

KAlLR

FEB

WB8BTH

MAY

K4TWJ

DEC

W8YA

JUL

118

KAlLR

JUN

WA4PYQ

AUG

W8FX

OCT

73 Magazine •

December, 1981

149

GILFER ASSOCIATES

HAL COMMUNICATIONS CORP.

HAM RADIO PUBLISHING

HAYDEN BOOK COMPANY

HEATH COMPANY

ICOM AMERICA, INC.

I SCAN ENGINEERING

KANTRONICS

KENWOOD

KRECO

MCM COMMUNICATIONS

MELCO PUBLISHING

MPJ

MFJ

MICRO CONTROL SPECIALTIES

MIRAGE COMM. EQUIP.

NCG CO.

PALOMAR ENGINEERS

P ALOMAR ENGINEERS

RADIO SHACK

RADIO SHACK
REX BASSETT

ROBOT RESEARCH

RSGB

S-F AMATEUR RADIO SERVICES

TAB BOOKS

TET USA

TRANSELECTRO-AMERICA

UNIVERSAL COMMUNICATIONS

VARIOUS PUBLISHERS

VIZ MANUFACTURING CO,

VOCOM

WELZ

YAESU ELECTRONICS CORP.

GUIDE TO RTTY FREQUENCIES

DS2050 KSR RTTY TERMINAL

GUNNPLEXER COOKBOOK

DIGITAL ELECTRONICS

IM-5228 VTVM

GU-182 0 AC GENERATOR

INVESTIGATING ICOM'S 730

TR-9000 MEMORY SCANNER

VARIFILTER

MINI-READER

TR-7 800 TWO-METER XCVR

TS-83 0S

T3-130S HF TRANSCEIVER

TR-9000 2M TRANSCEIVER

TS-530S HF TRANSCEIVER

TR-7730 2-METER FM TCVR

COAXIAL ANTENNA - C02A

SC-150A TWO-METER COLLINEAR

DAIWA'S NEW METERS

HANDBOOK: 10 FM

MFJ-1040 PRESELECTOR

SHORTWAVE CONVERTER

HFJ-102 DIGITAL CLOCK

MARK 3CR REPEATER

B1016 2M LINEAR AMPLIFIER

NCG 15 M TRANSCEIVER

INSIDE THE PALOMAR PREAMP

A QUAD FOR TWO METERS

REALISTIC PRO-2008

DX-200 RECEIVER

MICRONTA'S NEW MULTIMETER

PRO-2002 SCANNER

TLM-2 MOBILE MOUNT

80 BE RTTY/CW/SSTV TERMINAL

A GUIDE TO AMATEUR RADIO

S-F MOD KITS

OPERATING DESK

HANDBOOK; FM AND REPEATERS

10 FM FOR THE RADIO AMATEUR

HANDBOOK: TABLES & FORMULAS

GDX-1 DI SCONE ANTENNA

SQ-22 2M QUAD

AMATEUR CONVERSATION GUIDE

2300-MHZ DOWNCONVERTER KIT

4 BOOKS FOR EXPERIMENTERS

WD-747 DIGITAL MULTIMETER

COLLAPSIBLE WHIP FOR HT'S

TWO-METER AMPLIFIER

SP-300 SWR AND POWER METER

FT~707 HF TRANSCEIVER

FRG-7700 GEN. COVERAGE RCVR

K8DIU/4

AUG

KAlLR

SEP

N8RK

OCT

KA1LR

FEB

119

N1BEJ

MAR

AG 9 V/l

OCT

K4TWJ

NOV

WB8BTH

SEP

100

wlxu

MAR

WA4PYQ

APR

KA1LR

APR

WB8BTH

MAY

KA1LR

JUL

WB8BTH, N8RK

AUG

KA1LR

OCT

KA1LR

DEC

KA1LR

JAM

157

W8FX

MAY

110

KA1LR

NOV

KAlLR

FEB

119

WA4PYQ

FEB

117

KAlLR

MAR

WA4PYQ

JUN

130

RA1LR

JUL

KAlLR

OCT

KAlLR

JUL

W8FX

NOV

W8FX

DEC

104

N3BAB

FEB

W5JJ

APR

124

K6UGT

NOV

N3BAH

DEC

KAlLR

DEC

WB9PKD

AUG

N1BEJ

JUN

W4LVM

JAN

K4TWJ

JUN

KAlLR

FEB

lie

KAlLR

FEB

119

WD4LOO

MAR

WA4PYQ

FEB

117

KAlLR

AUG

KAlLR

JUL

K4TWJ

APR

N8RK

NOV

WA4PYQ

OCT

H8FX

MAY

100

N1BEJ

JUN

KAlLR

SEP

KAlLR

MAR

KAlLR

SEP

RTTY

ADD RTTY TO YOUR REPEATER

APPLES: FIVE BITS OR EIGHT

SOLID COPY RTTY TU

DS2050 KSR RTTY TERMINAL

MORE FOR LESS

KIM'S MAGIC FINGERS

WHAT'S IT ALL ABOUT, ASCII?

VOICE OPERATION, TOO
RTTY FOR THE APPLE
USES FLESHER TU BOARD
HAL COMMUNICATIONS CORP
RTTY TUNE -UP AID
RTTY TRANSMIT PROGRAM
RTTY TECHNOLOGY UPDATE

WB4EMI

FEB

WB6MEP

APR

K1VIC/2

JUN

KAlLR

SEP

WB4PWC

NOV

VE1AKL

NOV

112

W4RI, WB4APR

DEC

SATELLITES

DIRECT-PRINTING FAX
TRACKER - THE OSCAR FINDER
COST-EFFECTIVE OSCAR

PART III

TRS-80 PROGRAM

SOURCES AND SUGGESTIONS

HB8DQT
WD8DRK, K8UR
KA5EIM

JAN 54

JAN 88
SEP 70

150 73 Magazine • December, 1981

PHASE III AND BEYOND

THE SATELLITE TV CHALLENGE

SPACE SPINOFFS

HOW BIG A DISH?

SATELLITE CHANNEL GUIDE - I

SATELLITE TV RECEIVERS

BOB COOPER: A PIONEER

SATELLITE CHANNEL GUIDE

SATELLITE TV GLOSSARY

TVRO RCVRSiTHE INSIDE STORY

"CHOPSTICK" HELICAL FOR 432

SATELLITE NEWS

INTRO TO TVRO COVERAGE

HAMS AND TVRO

TVRO ANTENNA SELECTION

PROGRAMS ON THE SATELLITES

ALTERNATIVE DESIGNS

PERSONALITY PROFILE

PART II

PART I

SATELLITE CENTRAL, PART II

GETTING READY FOR PHASE III

N8RK

SEP

N8RK

NOV

WAlDCPr W2IKQ

NOV

GIBSON

NOV

WESTS AT

NOV

K4TWJ

NOV

N8RK

DEC

WESTSAT

DEC

GIBSON

DEC

9M2CR

DEC

116

TECHNICAL & THEORY

HEAT SINKS

SUB AUDIBLE TONE ENCODERS

COMPUTERS AND HF

DAZE OF WHINE AND NOISES

THE ELUSIVE GROUND FAULT

CAUTION: SOLID-STATE FINALS

AF AND RF SPEECH PROCESSING

TWO-METER ANTENNAS

INSIDE COAX

DF BREAKTHROUGH

ABOUT THE BEVERAGE

THE CCD ANTENNA

KEYER MAGIC

SPREAD SPECTRUM

ANTENNAS FOR BEGINNERS

BREAKING THE DECIBEL LOGJAM

INSTALLATION TIPS
USING MICROS EFFECTIVELY
IGNITION NOISE
REAL-LIFE ADVENTURE
LIVING WITH NO-TUNE RADIOS
PLESSY SL1676C
OMNIDIRECTIONAL THEORY
QUALITY AND CONSTRUCTION
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RECEIVING ANTENNAS
THEORY PLUS Q & A
ALL TTL CW KEYER
REPORT FROM AMRAD
NOT FOR NOVICES ONLY
COPING WITH NOTHINGNESS

WA40SH

JAN

WA7 LMO/N6XB

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126

W9JD/DA1FE

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130

K2PMA

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W50S

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N1II

FEB

STAFF

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WHS

MAY

WB6MMV/7

MAY

W7BEP

JUN

W2XQ

JUN

W4FD, W4ATE

JUL

N5DY

OCT

WB3KDU

NOV

NlII

DEC

SARA

DEC

136

TEST GEAR

RX AND CX

LOGIC PROBE

THE POWER WASTER

CAPACITANCE METER

A 60 -HZ FREQUENCY MONITOR

ADD-ON CAPACITANCE METER

X-BAND WAVEMETER

THE CALIBRATOR GATER

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CHECK YOUR SIG
MEASURING INDUCTANCE

WD 5 CD J

JAN

VERGONA

JAN

R6IQL

JAN

108

W4VGZ

JAN

132

K0YMJ

FEB

W4FEC

FEB

W1SNN

MAR

WB5PPV

MAR

WA0OHO

APR

STAFF

JUN

WA3RJS

JUL

WB7NEZ

AUG

STAFF

AUG

K3LF

OCT

100

NlII

OCT

131

K7YZZ

NOV

W5JJ

DEC

100

TRANSMITTING

TRANSMITTER TUNE-UP AID
THE FUN-MI TTER
AF AND RF SPEECH PROCESSING
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MORE FOR LESS

AUDIBLE POWER OUT INDICATOR
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WA8RBR

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STAFF

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W3BYM

AUG

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NOV

VHF & UP

NEW LIFE FOR OLD KLYSTRONS
X-BAND WAVEMETER
FLEXI-PLANE ANTENNA
CB TO 10 AND BEYOND

MICROWAVE TIPS

FOR 2-METER HT*S

USE WITH 432 TRANSVERTER

WA4WDL

FEB

WlSNN

MAR

NlPL

MAR

WB3CDE

MAR

73 Magazine • December, 1981 151

From

MAGAZINE

THE 1982 EDITION

GENERAL LICENSE
STUDY GUIDE

by Timothy M. Daniel N8RK

This is the complete guide to the General License,
Learning rather than memorizing Is the secret. This
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ORDER yours today and talk to the world.
SG7358 $6.95

The 1982 edition will be ready to ship in February.

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152 73 Magazine • December, 1981

NEW from

THE
NEW

WEATH ER
SATELLITE
HANDBOOK

BY DR. RALPH E. TAGGART

Here is the completely updated and revised edition of the best-
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73 Magazine * December, 1981 155

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Are You a Big Gun

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A WAYNE GREEN PUBLICATION

156 73 Magazine * December, 1981

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As a bonus, CW performance is improved as well
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Recent Mapej/ne Articles on Filter Cmtcedlng

YAESU FT-&Q1/90S. See IT, Sept Tffit
HEATH SB104A See "Ham Radio", April 1981
KENWOOD TS920 See "CQ'\ Me/eft 1 SWT

Read the original article or send St to FoxTango
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To make the modification, order the appropriate
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FOX-TANGO stocks the widest variety of custom-
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MARS, CAP, and commercial service. Center loaded for high efficiency. Enables tuning to exact resonance lo
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^See List ot Advertisers on page f62

73 Magazine • December, 1981 157

Take your favorite HX out
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158 73 Magazine * December, 1981

FOR THE NOVICE

hovke

««f.

NEW, UPDATED

EDITIONS OF OUR

FAMOUS NOVICE LICENSE

STUDY GUIDE AND
NOVICE STUDY TAPES

• NOVICE STUDY GLH0E-S673S7— by Timothy M Daniel N8RK. Here IS the most up to dale novice
Guide available. It is complete wtth information about looming Morse Code, has the latest FCC
amateur regulations and the current FCC application forms This guide *$ not a question/answer
memorization course but rather ft emphasises the practical side of getting a ham license and putting a
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theory. The most current information still a variable at test year's price $4 95

• NOVICE STUDY TAPES— CT7300— If you are just getting started in ham radio, you'll find theee
tapes Indispensable! This up-to-therninute revision of the 73 Study Course Is the perfect way to learn
everything you need to breeze through the Novice written exam. Theory, FCC regulations, and
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Once the test Is behind you, these tapes will go right on being useful, because may are packed with
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e EXTRA CUSS LICENSE STUDY QUIDE— SG1060—
Before going for your 1 x 2 call, it pays to be a master of
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FOR YOUR HAMSHACK

fa CODE TAPES

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$ 4.95 EACH

"GENESIS"

5 WPM— CT7305— This Is the beginning tape for people
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fi+ WPM— CT7306— This Is the practice tape for the
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spaced for 5 wpm). This tape is not memor izabfe. unlike
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13+ WPM— CT 731 3— Code groups again, at a brisk 14
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25+ WPM— CT7325— This is the laps for that small
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each*; order Bor more— BX 1002— for 11.25 each".

MAGAZINE

W2NSD/1

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• Preserve and protect your collection for a lifetime!
Order these handsome red binders with gold lettering,
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BACK ISSUES

• SACK ISSUES — Complete your collection; many are
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ST0250— Single back issue July 1960 on . . 13 50

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FOR TOLL FREE ORDERING CALL 1-800-258-5473

THE tS TECHNICAL LIBRARY

WORLD
SERVICES

FREQUENCES

• BEHIND THE DIAL-BK7307-By Bob Grove, Get
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The introduction contains interesting photos Of Slew
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*4.95/

• SSB THE MISUNDERSTOOD MODE- BK7351 -by
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enable the ambitious reader to construct his own side-
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$5.50*

• PROPAGATION WIZARD'S HANDBOOK— BK7302—
by J H Nelson When sun spots riddled the worldwide
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FOR
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CONTES

• THE CONTEST COOKBOOK -BK7308— reveals the
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NEW!

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the information on the most sophisticated and effective
spacecraft now In orbit. This book serves both the ex-
perienced amateur satellite enthusiast and the new-
comer li is an introduction to satellite watching, pro-
viding an I he information required to construct a com-
plete and highly effective ground station. Solid hard-
ware designs and all the instructions necessary to oper-
ate I he equipment are included. For experimenters who
are operating stations, the book details all procedures
necessary to modify equipment for the new series of
spacecraft. Amateur weather satettite activity repre-
sents a unique blend of interests encompassing elec-
tronics, meteorology and astronautics. Join the privi
leged few in watching the spectacle of earth as seen
from space on your own monitoring equipment. $6,95.*

• MASTER HANDBOOK OF HAM RADIO CIRCUITS—
9K1Q33— This Is an encyclopedia of amateur radio cir-
cuits, cleaned from past Issues of 73 Magazine and
carefully selected according to application. You'll find
many you've never seen before, some new twists on the
tried and true, and several that have been tong forgotten
but are well worth remembering. Where your interest
ranges from rag chewing to EME, from CW to slow-scan
TV, from DX to county nets, this handbook will be a
welcome addition to your shack IS 95 *

• OWNER REPAIR OF RADIO EQUIPMENT— BK731D-
by Frank Glass K6RQ. Here's a book that wili teach you
an approach to troubleshooting without a shack lull of
test equipment. Written in a narrative, non-mathematical
style, ft will encourage you to successfully fix your own
rig problems SO to 90% of I he lime, Even if you don't
want to fix, you can learn a lot about how things work
and tail Add to your library and personal expertise.
$7,95.*

• IC OP AMP COOKBOOK— BKf 028— by Walter G
Jung, Covers not only the basic theory of the IC op amp
in great detail, but also includes over 250 practical cir-
cuit applications, liberally Illustrated 592 pages,
5'A xBN. softbound $14.95/

• THE POWER SUPPLY HANDBO0K~BK73O5~

Need a power supply for a gadget you're building? In
the POWER SUPPLY HANDBOOK there are dozens
ready-to-buil d> plus detailed steps for designing your
own. There are circuits and parts lists for ait kinds ol
supplies, ranging from simple DC types to highly
stable regulated versions If you need a circuit to con-
vert a DC voltage to a higher or lower voltage, turn DC
into AC, or AC to DC— then this Is the book you need
With more than 400 pages, you should be able to find
Just the circuit you need. WHhoui a doubt one of the
best power supply source books available, compiled
by the editors of 73. $9.95. -

HANDBOOKS
FOR THE
HAMSHACK

• THE TEN METER FM HANDBOOK -&K1 190— by Bob
Heil K9€ID This handbook has been published to help
the ten meter enthusiast learn more about the many
methods of conversions and tricks that are used to m ake
existing units work better. Join the great "tfnkerers" of
the world on ten FM and enjoy the fantastic amount of
fun in communicating with amateur stations worldwide
on ten meter FM. 94.95/

• THE PRACTICAL HANDBOOK OF AMATEUR RADIO
FM REPEATfERS— BK11B6— by BUI Pasternak WA61TF
(author ol 73 Magazines monthly column u Looking West")
This is the book tor the VHFAJHF FMef, compiled from
material submitted by over a hundred individuals, clubs,
organizations and equipment manufacturers A "must
have" for your ham shack shelf. 512.96,

The 73

Test Equipment
Library

• VOL I COMPONENT TESTERS— LB 7359

how

to build transistor festers (8), diode testers (3), IC tast-
ers (3}r voltmeters and VTVMs (9), ohmmeters (8 differ-
ent kinds), inductance (3 ). capacity (i), Q measure-
ment crystal checking (6). temperature (2), aural
meters for the blind (3) and all sorts of miscellaneous
data on meters . using them, making them more ver-
satile, making standards. Invaluable book. $4.95/

• VOL II AUDIO FREQUENCY TESTERS— LB 7360—
. . .jam packed with all kinds ol audio frequency test
equipment if you're into SSB, RTTY, SSTV\ etc.. this
book is a must for you, . .a good book for hhfi addicts
and experimenters, too! $4.95/

• VOL III RADIO FREQUENCY TESTERS— LB 7361 —
Radio frequency waves, the common denominator of
Amateur Radio. Such items as SWR. antenna Inv
pedance, line impedance, rl oulpui rod Refcd sirongth,
detailed Instructions on testing these Items includes
sections on signal generators, crystal calibrators, grid
dip oscillators, noise generators, dummy loads and
much more. 14,95/

• VOL JV IC TEST EQUIPMENT— LB7362— Become a
troubleshooting wizard! fn this fourth volume of the 73
TEST EQUIPMENT LIBRARY are 42 home construction
projects for building test equipment to work with your
ham station and in servicing oigilai equipment, Plus a
cumulative index for all four volumes for the 73 TEST
EQUIPMENT LIBRARY. S4.95/

• RF AND DIGITAL TEST EQUIPMENT YOU CAN
BUILD— BK 1044 — flt burst, function, square wave gen-
era tors, variable length pulse generators — 100 kHz
marker, l-t and rf sweep generators, audio osc, afrrf sig-
nal Injector, 146 MHz synthesizer, digital readouts tor
counters, several counters. prescalerr microwave
meter, etc. 252 pages. $5.95/

*Use the order card In this magazine or Itemize your order on a separate piece of paper and mail to: 73 Radio Bookshop •
Peterborough NH 03456. Be sure to include check or detailed credit card information No C O.D. orders accepted. All orders
add Si 50 handling first book, it. 00 each additional book. $10 00 per book foreign airmail Please allow 4 6 weeks for
delivery Questions regarding your order? Please write to Customer Service at the above address. (Prices subject to Change
on books not published by 73 Magazine.)

FOR TOLL FREE ORDERING CALL 1-800-258-5473

ANTENNA BOOKS 5 new antenna books

*VHF ANTENNA HANDBOOK- BK73BB— The NEW
VHF Anienna Handbook details the Theory, design and
construction of hundreds of different VHF and UhF an-
tennas. , A practical book written for the average ama-
teur who takes joy tn building, not full of compter for-
mulas for the design engineer Packed with fabulous an
tertna projects you can build. S5IK."

« THE GIANT BOOK OF AMATEUR RA0IO ANTENNAS
With the GIANT Book of Amateur Radio Antenna*
BK1104— by your side, antennas will become the least of
your worries Over 450 pages ol design Ideas, theory and
reference data make this book live up to its title. The 7
chapters cover everything from basic antenna theory
through designs tor DIY accessories, as well as dozens of
antenna designs. Whether planning to buiid or buy,
design or admire, lest or enjoy a ham antenna— this is the
book lor you From the editors of 73t published by Tab
Boohs. J95S."

• 73 DIPOLE AND LONG-WIRE ANTENNAS— BK 1016
—by Edward M. Noll W3FOJ , This Is the first collection
of virtually every type of wire antenna used by ama-
teurs. Includes dimensions, configurations, and de-
tailed construction data for 73 different antenna
types. Appendices describe the construction of noise
bridges, line tuners, and data on measuring resonant
frequency, velocity factor, and swf. $5 50."

e PRACTICAL ANTENNAS FOR THE RADIO AMATEUR
— BK1015— A manual describing how to equip a ham
station with a suitable antenna. A wide range of antenna
topics, systems, and accessories are presented giving
l he reader some food for thought and practical data for
construction. Designed to aid the experienced ham and
novice as well. Only $9.95. *

• ALL ABOUT CUBICAL QUAD ANTENNAS (2nd edi-
tion)— BKi 196 — The Classic on Quad design,
theory, construction, and operation. New 2nd edition
contains new lead and matching systems and new
data. $5,95.'

• BEAM ANTENNA HANDBOOK (New 5th edition)-
BK1 W— Yagt beam theory, construction and operation.
Information on wire beams, SWR curves and matching
systems. A "must " for serious DXers $595"

• VHF HANDBOOK FOR RADIO AMATEURS- BK 1198
—Contains information on FM theory, operallon and
equipment, VHF antenna design and construction, sateU
ti!e~cM£» and the newest solid state circuits 16 95*

• THE RADIO AMATEUR ANTENNA HANDBOOK -
9KT199 — All about wire antennas, beams, tuners,
baluns, coax, red ■ a is SWR and lowers Clear and com-
plete information $6 95"

• SIMPLE, LOW COST WIRE ANTENNAS FOR RADIO
AMATEURS— BK 1200— All new data and everything you
want to Know about low-cost, multi-band antennas, inex-
pensive beams, invisible" antennas tor hams in
"tough Ht locations $6.35*

COOK BOOKS

• TTL COOKBOOK— BK1G63— by Donald Lancaster
Explains what TTL is. how it works, and how to use it.
Discusses practical applications, such as a digital
counter and display system, events counter, electronic
stopwatch, digital voltmeter and a digital tachometer.
$9,50

• CMOS COOKBOOK — BK1011— by Don Lancaster.
Details the application ot CMOS, the low power logic
family suitable lor most applications presently
dominated by TTL Required reading for every serious
digital experimenter! 510.50.*

• TVT COOKBOOK — BK1064— by Don Lancaster.
Describes the use of a standard television receiver as a
microprocessor CRT terminal Explains and describes
character generation, cursor control and interface in-
formation in typical, easy to- understand Lancaster
style .89,95."

SPECIAL OFFER

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by class of license, emission type* and fre-
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vision for the new 30. 17* and 12 meter bands.
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chase of 1 or more books from the Radio Book-
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CH7300&1 95.

m HOW TO DEFEND YOURSELF AGAINST RADAR— BK120/I— by Bruce F Bogner and James R. Bodnar, a lawyer
and rada* expert. This book gives you the ammunition to challenge the radar "evidence' that usually leads to a
speeding convrction. The major part ot the book details the inner workings ol radar— you II become more of an ex
pert than most police officers and judges. The remainder of the book outlines how to defend yourself agamst a
speeding ticket— the observations, measures and testimony you must obtain to defend yourself without the help of
a lawyer The price is a lot less than a tine! 16-96*

THE WELL
EQUIPPED
HAM SHACK

*4»

*^>

*»>

•wORJS

• WORLD REPEATER ATLAS -BK73tS—CompfeTefy up-
dated, over 230 pages ot repeater listings are indexed by
location and frequency. More than 50 maps pinpoint 2000
repeater local tons throughout the USA Foreign listings
include Europe, the Middle East. South America, and
Africa. $495'

• THE MAGIC OF HAM RAD!O^BK73l2— by Jerrold
Swankr WBHXR begins with a brief history of amateur
radio and of Jerry's involvement in it. Part 2 details many
of ham radio's heroic moments. Hamdom's close lies
with the continent of Antarctica are the subject of Pan 3.
in Part 4 the strange and humorous sides of ham life get
their due And what of the future? Part 5 peers info the
crystal tan. $4.95."

• A GUIDE TO HAM RADIO— SK7321— by Larry
Kahaner WB2NEL What's Amateur Radio all about'' You
can learn the basics of this fascinating hobby with this
excellent beginner's guide It answers the most frequent-
|y asked questions in an easy-going manner, and It
shows the test way to go about getting en FCC license,
A Guide to Ham Radio is an ideal int rod uc ho n to a hobby
enjoyed by people around the world $4.95 *

• WORLD RADIO TV HANDBOOK 1361, 35TH EDITION
— BK1 184 — This book js the be Die of international broad
casters, providing the onty authoritative source of exact
information about broadcasting and TV stations world
wide, This i98i edition is completely revised, giving
comprehensive coverage of shortt medium and long
wave, 560 pages of vital aspects of world listening.
S16.5Q

MICROCOMPUTER BOOKS FROM 73

• SOME OF THE BEST FROM KILOBAUD/MICROCOM-
PUTING — BK731 1 — A collection of the best articles that
have recently appear e£ .-. Kilobaud/ MICROCQMPUT
IN& Included is material on the TR&40 and PET
systems, CP/M. the 808080857280 chips, the ASR-33 ter-
mi nai Data base management, word processing, text
editors and file structures are covered too. Programming
techniques and hardcore hardware construction proi
eels for modems, hlg/h speed cassette interlaces and
TVTs are also Included in this large format, 200 plus
page edition. $10.95.'

• 40 COMPUTER GAMES— BK7381— Forty games in all
in nine different categories. Games for large and small
systems, and even a section on calculator games. Many
versions of BASIC used and a wide variety of systems
represented, A must for the serious computer games-
man $7,95*

• THE NEW HOBBY COMPUTERS— BK7340— This
book takes it from where "HOBBY COMPUTERS ARE
HERE!'r leaves off, with chapters on Large Scale integra-
tion, how to choose a microprocessor chip, an Introduc

cost UQ for a computer, com-
ig memory boards -and
much, much more! Don't miss this tremendous value!
Only $4.95.*

k IWP I h PIV ww lw yi ^W^WUB U PIMUI **>

tlon to programming, low co
puter arithmetic, checkini

• UNDERSTANDING AND PROGRAMMING MICRO
COMPUTERS— 8K73S2— A valuable addition to your
computing library This two-part text includes the best
articles that have appeared in 73 and Kilobaud
Microcomputing magazines on the hardware and soft-
ware aspects of microcomoutmg Well-known authors
and well-structured text helps the reader get involved.

• HOW TO BUILD A MICROCOMPUTER-AND REALLY
UNDERSTAND IT— BK7325-by Sam Creason, The elec-
tronics hobbyist who wants lo build his own microcom-

?uter system now has a practical ' Now-To " guidebook
his book is a combination technical manual and pro-
gramming guide that lakes the hobbyist step-by- step
through the design, construction, testing and debugging
of a complete microcomputer system. Must reading for
anyone desiring a true understanding of small computer
systems. 19 95.*

• HOBBY COMPUTERS ARE HEREl^BK7322— If you
want to come up to speed on how computers work. . .
hardware and software, . this Is an excellent book, It
starts with fundamentals and explains the circuits, and
the basics of programming, along with a couple ol TVT
construction projects, ASCII-Baudot, etc. This booH has
the highest recommendations as a teaching aid $4.95 "

*Use the order card In Ihis magazine or itemize your order on a separate piece of paper and mail to: 73 Radio Bookshop •
Peterborough NH 03456 Be sure to include check or detailed credit card information. No COD. orders accepted. Ail orders
add St. 50 handling lirst book, St. 00 each additional book, $10 00 per book foreign airmail Please allow 4-6 weeks for
delivery Questions regarding your order? Please write to Customer Service at the above address {Prices subject to change
on books not published by 73 Magazine.}

FOR TOLL FREE ORDERING CALL 1-800-258-5473

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Pag*

ft,S. No
2 a£a.' Advanced Electronic

Application* 80. 122, 196

478 ACE CommurncaMon 68

329 AR Technical Products iQB

44Q Advanced Comm Intranational 85
40G Alaska Mi crowiva Labs 37,156

20 All Electronics. &j

Amaieur Electronic Supply

77, BB. 102, 152. 156, 172

5 Amateur-Wholesale Electronics .31

461 Amneur-Whoiesiie Electronics 30
33 1 Am a teur-Wholesake Electronics 59

American Crystal Supply 201

334 Amidon As40caf- 102

JSKf in mi OC1 ....... ........... IOf

Antenna SanK .85

63 Anitnna Speciallils, ...SO

71 Applied Invention 158

Appliance & Equipment Co., inc.

■ 200
8 Apiron Lata 106

Associated Redid. . . . 78

469 BG Carl Electronics 200

11 Barker & Williamson 30,152
305 Barry Electronics ... §7
26 Bash Educational Services — 76

440 Rev Basse it Electronics, Inc 170

478 Rex Basselt Electronics* Inc 18

420 Benjamin Michael Industries. .. 187
10 BHilCo .30

12 Bullet Electronics .220

Butternut Electronics 63, 179

321 Certified International .201

13 Ctegg 155
89 Outierfree Modular Consoles 41

6 Code Quick 200

480 Comrnsoft 190

483 Commsoft - 188

28 Comm, Center. NE 204

382 Comm Concepts. Inc. ~. t5fl. 170
377 Communications Electronics , 203
487 Communications Electronic

Specialties 189

462 Communications Electronic
Specialties . .,91

443 Comm Specialists ...33

t5 Comm. specialists 103

438 Comm. Specialists 169

444 Compute/ Plus, . . . 200

Con ley Radio SupplyrAEA. ..... 10t

Crown Micro Products 133

70 Cubic Comm . 98. 99

489 Curtis Electro Devices, Inc. .... . 188

466 DB + Enterprises. ..200

R S No Pa-ge

330 Deoco Dectronics 127

307 Debco Eleciromci. ..96

Derrick Eleci ionics/ AEA. 106

* Desktop Microcomputing 154
411 DGM Electronics. Inc.. 112

416 Qigi-Key 215

Digital Research Parts. , ♦.♦,.,. 223

43 ONE, Inc. ....,..,,,,,.**,*,,*. 193

16 Downlink. Inc. 42

425 Ooppler Systems 202

R L. Drake Company 37, 117

Dxpediuons International 42

453 E.GE-, Inc IBS

30 Microcomputing . .... 155

91 ETCO Electronics. . ...... 113

* Electronic Equipment Bank .. 119
447 Electronic Hobby Innovations, 79

82 Electronic Recyclers of MA 200

24 Encomm, Inc ....,..* 163

400 Engineering Consulting. . , 91

Erickson Comm 187

Everg>ades Communications . 42

73 Eipotek 86

85 FaMscait, Inc. 193

439 Ben Franklin Electronics. , 201

323 Fox-Tango Corp . . . 157

* Global Electronics. 61

417 Gotham Antenna 157

% RnT F^aliairaaialir- ■ ■ I aCU •

86 HJR Communications. . 37
345 Hmt Communications

.. 106, 107.110

31 HaiTronn 76

Ham Radio Center. ..... . HI

* Ham Radio Outlet ..3
449 The Ham Shack 121

33 Hamtronics, NY 221

460 HandlTek 202

18 Hastings Antenna 51

74 Heath Co. 53

34 Henry Radio Co* H. 81

72 Higam &eciron>cs . . . *

320 Hoosker Electronic* . . .57

Hustler, Inc 2B

316 Hy-Gain Div of Telex Comm.

69 71

■> ■ | .■*»■ i ■■■■■>■■■-■ rai Wa. ■ ■

' ICOM ..10. 11, 18S

78 I ndepenrJent Cry stal Supply Co.

.-_., .***..ai-ai--t">B'aj-M>-aiBaT 4t%»P\/

35 Info-Tech 87

414 Inoiek Engineering 200. 202

insert Products. ,...158

445 Instant Software

Page

124
125

RS.No

Dealers

Amateur Radio Progname.
36 International Crystal
409 JDR Microdevpcea. ■

38 Jameco Electronics., .

39 Jan Crystal ... 179

471 Johnston, Bill/N&Kfl , 157

1 KB Microcomputing 155

81 KDK Distributing 19

MjJW . . i i ^ • i ■ ■ * ■ ■ ■ ■ ■ i ■ ' f ■ ■ * ■ i i • - «1

Kantionic* ......... , .... 171, 170

' Kirk Electronics. 143

■ Kenwood CovIW.7,26,6&65
457 Lewis Construct ion Co 45

* Lfve-Via Satellite, inc. ..,,....^51

481 Luly., 186

451 MCM Communications ,,43

477 MCM Communications.. ,.,82

47 MFJ Enterprises

.83.85,87,89,91,93

482 MFJ Entsfpnsea 189

48 MH£ Electronics .... 205-214

77 M-Squaied Engineering 85

5ft Maca* Electronics 173

44 Macroiionics . ...... 123

45 Madison Electronics Supply

2A 7Q

_ j I - i . i <■•■■] i ■■rBaaaar-->'l- SV| MbAf

139 Memphis Amateur Electronics . . 80

49 Micro Control Spec! allies. ..... 80

61 Microlog . 72T73

313 Micro Management Systems

. ...108.193

50 Microcrafi Corp 121. J58
52 MidCom Electronics, Inc . 131
308 J. W Miller ...119. 121

84 Mirage Comm. -83

318 National Comm. Group 95, 122

412 Nemai Electronics 79

327 Nordlund & Associates , 200

* Of pit Magazine ......... 173

PC Electronics . . 101, 128

Palomar Engineers 4. 104

421 Phillips- Teen Electronics 201

300 Pipo Comm 170

58 Poty Paks 102

459 ORO Engineering . . . 137

60 Quest Electronics ♦ . , 218

42 RF Gain Ltd 157

315 Radio Activity 35

61 Radio Amateur Calibook. Inc

88.113

454 Radiottil. .. 86

479 Radio Snack, , 96

381 Radio Systems Technology. .... 201

as.

397
62

54
418

378

304

484

■

1
349

433

367

436

486

46$

403

316

■

328

311
437
485
90

■

29
83

336

No. Page)

Rad*o World ..... 78, 170

Ramsey Electronics 217, 222

Richer*'! Engineering. Ltd 201

Robot Research 23

flolin Distributors 102

Rous Wire Die, Inc 79

vifl * * 1 * * ■ m-4* * 1 4 > I it » i a> m m J 1 wO

S F Amateur Radio Service 187

Sabadia Export Corp. 42

Sabtrontcs ISO

SCAN 41

Semiconductors Surplus - 218. 21 9
73 Magazm*
BooksJCati tor Manuscnpts. . 66

Books/Ham Club Special 66

73 Magazine

Books 152, 153. 156, 159-181, 173

Dealers Ad 194

"Moving' .153

Subscriptions . 1 14. 202

University Mic/olilms 202

Sherwood Engineering 201

Skylec 201

Step Electronics, 195

Spacecoasl Research 42

Spec Ironies ... S7. 224

Spectrum Comm 129

Spectrum international Inc 153

Standard. .*, 166

Star Trak Systems, Inc 51

Stewart Quads. 28, 156

Stnjjc Corp 202

Surplus Electronics Corp. . . 202
Tele* Comm Inc , , . , 69. 71

Ten- Tec, Ire . . . 2V1 15

Tax.a$ Microtrpnics - 48

Trac Electronics 102

Trans Comm. Inc, ,52

Universal Communications. .49,84

vg pfoducis. - . .. . t43

Van Gordon Eng. 93,113

Vanguard Labs ....202

Vani-Ptate Co. 152

Varian Eimac... 190

VoCom Products Corp 109

WS Engineering , . . , 28

Wacom Products ,158

Western. Eleclronlcs 152

Wilson Systems. 24,25, 36

Wind ward Jnc 171

Yaesu Electronics Corp

Co¥lll, 16.17

ab ftmHS^^ Pv I U Jfm, m a ■ « . c b a iiiiiaai

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ALL ABOUT CUBICAL QUAD ANTENNAS
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162 73 Magazine • December, 1981

INTR

UCING SAIMTECS

SANTEONOLOGY breaks into

the 440 band with style! The new
ST-7/T synthesizes the entire band
in 5 kHz steps, works both up and
down repeater splits and does it
all right from your hand, with ver-
satile power options of 3 watts, I
watt or even 50 m ill r watts fall
nominal), to reach out to where
you want. The high power mode
of 3 watts radiates on 440 [ike 5
watts on 2 meters . . . and that's a
handfullf

Tones? This one has them , . . tones
and subtones! The 16 button tone

pad is a SANTEC Standard
extra cost, and the ST-7/Ts op-
tional synthesized subtone en-
coder is controlled by the radio's
front panel switch,

All the regular SANTEC acces-
sories used with your HT-I200 fit
the ST-7/T as well, meaning that
you can enjoy both bands fully
with a smaller cash investment.
Grab the new SANTEC ST-7/T and
join the fun on 440 MHz. See your
SANTEC Dealer for delivery
derails'

SANTEC

ID . 1

STILL THE LEADER

*Safe of the ST-7/T is subject to FCC Certification

SANTEC'S popular HT-1200 is the incom-
parable 2 meter leader This little rig is hand-
ing over quality power and features that
you'd expect from something nearer the size
of a bread box, SANTEC packs a 2 meter
ham shack into the palm of your hand!

You can carry scan, search, TO memories and
fully synthesized key pad control around
with you and sail get out with a big 3.5
watts (nominal). Compare them apples to
anything you want, and settle for nothing
less.

SANTEC

r"~

Encomm, lr>C.

nc» wnA rm mirr rftttfMIW **pul*

2000 Avtrtue- G

WJTEC HT.1300

Sun* GOO

VWTIC S*

Bwio TX 75074

*ur»* mi WtfEC Qt*m

M*U

The SANTEC HT-I200 is approved under FCC Part 15
and exceeds FCC regulations limiting spurious emissions

c 1981. Encomm, Inc.

2000 Avenue G, Suite 800. Piano, Texas 75074
Phone (2 1 4 [423 -0024 * INTLTLX 203920 ENCOM UR

NAME

GUI

ADDKBS

CJTY

STWE II?
YOU HAY SEND A DUPUCATE OF THIS FORM.

1
I
I

I
I
I
I

I
I

FUN!

5 73 helped pioneer these

22 Every pot has one— most

machines

repeaters, too

6 Bonne chance, on CW

23 Say die?

7 73 used to track him

26 Mexico prefix

11 Component

29 Civil defense (abbrj

14 Former column (3 words)

30 Popular bootleg prefix

20 Costa Rica prefix

32 Postscript

John Edwards KI2U
78 56 86th Street
Gfendale NY 11385

As the year draws to a close, our thoughts return home. The holi-
day season arrives, and one longs to be with family.

Well, it may not be family in the traditional sense, but "home1' for
the FUN! column is 73 Magazine^ This month* we take an affec-
tionate look at the old homestead and contemplate, with some
curiosity, what our hobby would be like without it,

ELEMENT 1— CROSSWORD PUZZLE
(Illustration 1)

Across

1 T^sQTH

8 Pakistan prefix

9 Norway prefix

10 RTTY: cal

11 73's digital section

12 KP4-land (abbr.J

13 Morse or ASCII

14 Contest columnist

15 Sweden prefix

16 73$ is 21

17 Test letters

18 A clear band space

19 Deface

21 An ARRL section (abbr.)

22 Cover artist; issues #1 and

24 Cell type

25 A 73 article, before pub-
lished (abbr)

26 K2AGZ

27 Mr. FUN! (abbr.)
29 Bolivia prefix

31 Poland prefix

33 Monthly feature (2 words)

Down

1 Belonging to "Looking
West1' columnist

2 When W2NSD/1 ,

hams hsten

3 Iran prefix

250

73's original QTH

25 1

ELEMENT 2— MULTIPLE CHOICE

1) During this publications early days, Wayne Green would often
extol the virtues of his favorite car. It was:

1, a 1912 Buick

2. a Porsche

3. a Volvo

4, a Flat

2} When this column first appeared, in October, 1980, it was written
by WB2IBE. Whatever happened to him?

1. He quit to write a similar column for Creative Computing
2 He died

3. He retired

4. He upgraded and changed his call to KI2U

3) What was 7-Ts original cover price?

1+37(t
2.73c
3. 75«
4.88C

4) How much did a life subscription cost in December 1961?

1.S30

2. $50

3. $75

4. $100

5) Which person listed below has not been a DX columnist for 73?

1. James Cain K1TN

2, Floyd Vivmo WA2DCS

3, Chuck Stuart N5KC

4. Yuri Blanarovich VE3BMV

ELEMENT 3— TRUE-FALSE

1) During this magazine's first two years, it was
printed on green paper to differentiate it
from the competition.

True False

AAPROPAGAT I ONHA

S M T T O F

FCORUSHEL

S V S K R E

HLLH I NGBE

O I H A T A

FSUTTHEWT

C N S I T I

GDOR I DSBT

I O D S Y S

SROVLL I KE

A C F E L J

EA I GGFATR

L F C WO B

TWESTGGOS

E E WO O I

BAGEYWBTW

V T R O P E

RRENAHAKO

ERBH I D

LWJA IWPTM

N Y J P L E

HMAHWKOMJ

T A Z K A D

F TWOMHOOW

S A A I J E

MTROPERO I

BSUCXMNK I NGMYDL

Illustration 1,
164 73 Magazine • December, 1981

Illustration 2.

2) From 1965 to 1971, the Cigar Smoker's Jour-
nal was a 73 publication.

3) Wayne Green once edited CO Magazine.

4) The ARRL had a full-page ad in 73's frrst
issue.

5) A 73 FUN! editor once campaigned for ARRL
office by handing out promotional rolling
paper.

6) 73 is available in microfilm from University
Microfilm, Ann Arbor, Michigan.

7) While this year+s MFUN! Polf* counted 612
ballots, the actual response was closer to
1,000.

8) "RTTY Loop" made its 73 debut in the June,
1977, issue.

9) The first ft em ever described in 73's "New
Products" section was an Allied catalog,

10) Wayne Green, in addition to his many other
responsibilities, is also the mayor of Peter-
borough, New Hampshire,

11) YA1NSD was Wayne's callslgn in
Afghanistan,

12) 73 also publishes HR Report,

13) The ARRL subscribes to 73.

14) Mickey Mouse once appeared on 73* s cover

15) In 1976, 73 published 13 issues.

16) Someone once wrote to "Ham Help" asking
for assistance in building a particle beam.

17) A 1980 73 profile of Dick Bash opened with
the quote, ''Morality? Mant who am i to
judge morality?"

18) Before this 73, there were others,

19) "73 ONTHE-AIR" is the name of 73's month-
ly cable TV program.

20) A 73 columnist was once interviewed by
Johnny Carson on the "Tonight Show."

ELEMENT 4— FILL IN THE BLANKS

1) You are reading issue # (no peeking).

2) Along with "Never Say Die/' the other three original 73 features
still being run are , , , and ,

3) "WelL . , I Can , Can't I?"

4) -ARRL Love it, Hate itT ."

5} As editor of Astounding Science Fiction, he gave sci f i writers
such as Isaac Asimov and Robert Hefnlein their first national
exposure. Later, he wrote an article for the first issue of 73 and
was listed as a contributing editor. His name was .

ELEMENT 5— HIDDEN WORDS
(Illustration 2)

Hidden In this puzzle are the name often past and present 73 fea-
tures. The words are formed in any direction— horizontally, verti
cally, or diagonally, forwards or backwards. As you find each word,
circle it.

THE ANSWERS

Element 1:

See Illustration 1A.

Element 2:

1) — 2. Fun, if you can afford it

2)— 4. A truly remarkable fellow.

3)— 1 Imagine a time when 73<t was too much to charge for a

magazine!
4)— 1. Wayne told you it was a great deal
5)— Z But he's available,

Efement 3:
1)— False
2)— False
3)— True
4)— False
5)— True
6)— True
7)— True
8)— True
9)— True
10)— False
11)— True
12)— False
13)— True

14)— True

15)— True

16)— False

Come on!

Hardly.

And it hasn't been the same publication since.

Would you believe a classified?

It seemed like a good Idea at the time — but I lost.

Yeah, but I have to squint to read it.

Next time, I'll wait longer before counting,

And it's still going strong.

To the delight of amateurs everywhere.

At least f think not.

Not recently.

Right state, wrong company.

Of course. My 73 issue #1, by the way, is stamped:

'■Received: ARRL HO." I got it this year at a local

flea market* A real collector's item, no?

September, 1977, being printed on a Teletype.

The usual 12, plus a special year-end "Holiday"

issue.

If this one were true, OSCAR might be in trouble.

PET

E R

B_Oi

R O U

S EL

■ l

E^HL
P j«i

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TlK

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A G EHU

RY|

L O

t|m

AM L

I N

Kl ' PE

■ m

sflu

■ a

s|d

A V

EHJ E

■ x^HeHc

pHs

n]e w

P R

O D

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liiustration 7 A.

(PROPAGAT I 0~N)H A
TOFFCORUSH e(l)

yS,

N G B

HEW

D S B

L I K

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B S

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J(P
Z K A
A I J E M(T ROPE

UCXMNK I NGMY

liiustration 2A,
73 Magazine • December, 1981 165

17)— True
18)— True

19)— False
20)— True

Morality? Man* I just take the cash and run.
As you may have guessed. 73 was a popular title for
various club newsletters and other ham publica-
tions. The 1960 73 stuck.
?3K$ Tuesday night skeds.
Johnny and I chatted back in 1969.

Element 4;

1)— 255; 2)— Propagation. Letters, New Products; 3)— Dream;

4)" Don't care; 5) — John Campbell.

Element 5:

See Illustration 2A.

SCORING

Element 1:

Twenty points for the completed puzzle, or 1/2 point for each ques-
tion correctly answered.

Element 2:

Four points for each correct answer,

Element 3:

One point for each correct answer.

Element 4:

Four points for each blank filled.

Element 5:

Two points for each word found

Think you know this magazine?

1*20 points
21-40 points

41-60 points

61-80 points

"73 Magazine'? Oh, is that what Pm reading?"
Once wrote a letter to Wayne complaining about a

misleading question In the FUN! column.
Bums issues off of friends.
Is an ardent subscriber.

81-100+ points Has memorized the yearty indices.

/WARDS

8/7/ Gosney KE7C
Micro-80, Inc.
2665 North Busby Road
Oak Harbor WA 98277

KOREAN AMATEUR
RADIO LEAGUE AWARDS

This week I was the happy
recipient of a very nice letter
from the Korean Amateur Radio
League. Two very attractive
awards were among the mate-
rial received and it's my honor to
share the KARL AWARDS with
you now.

AKA, the Worked Ail Korean
Prefix Award, Is issued to ama-
teurs and shortwave listening
stations worldwide on payment
of a fee of 5 IRCs and an award
application.

Each claim must be accom-
panied by a list of Korean pre-
fixes worked in prefix order.
Each list must be accompanied
by a signed verification of two
amateurs that the applicant has

confirmation of each contact In
his or her possession at the time
of application. Please do not
send QSL cards; the verified list
will suffice.

Cards dated on or after Jan*
uary 1, 1959, will qualify. Con-
tacts made from any location
within your call area are eligible.
Contacts with HL9 stations will
be graciously accepted.

All correspondence should be
sent to Awards Manager, Kore-
an Amateur Radio League, CPO
Box 162, Seoul Central, Korea,

The HM Award, formerly
known as HMA, has identical
application requirements, with
the exception that the award is
issued for total HM/HL OSOs
worked in any one of five Award
Classes, The following classes
apply; Class K, 0, R, E, and A.
Spelling out the country's name,
the classes require 5, 10, 20, 30,
and 50 OSOs respectively to
qualify.

St*

A K A

U r * )t f\

: .•

When applying for either of
these classic Asian awards, tell
our friends in the "land of morn-
ing calm" that you read about it
in 73 Magazine*

BULGARIAN 1300 AWARD

The Bulgarian Federation of
Radio Amateurs introduces the
award, Bulgaria— 1300, to com-
memorate the 1300th anniver-
sary of the foundation of the
Bulgarian State, in 6S1 AD.

This award will be issued to li-
censed radio amateurs through-
out the world having the
necessary score for established
two-way radio contacts with
Bulgarian amateurs. To be eligi-
ble, all contacts must be made
in the period January 1, 1980,
through December 31, 1981,
This gives our readers only a
month, so you'd better hurry and
work a few contests before the
deadline!

The award is available in
three categories: Class 1 — re-
quires 1300 QSO points; Class
2— requires 1000 QSO points;
Class 3— requires 500 QSO
points.

QSO points are earned as fol-
lows: 30 points for QSOs with

any Bulgarian amateur located
in the capitals of Bulgaria work-
ing with the prefixes LZ13.
These are LZ13C (Sofia, The
Centra! Radio Club); LZ13CSF
(Sofia): L213CPL (PHska);
LZ13CPR (Preslav), and
LZ13CWT (Veliko Tlrnovo). Five
(5) QSO points are earned for
contact with any other LZ sta-
tion irrespective of his or her
callsign.

Regardless of operating
mode, contacts may be made
once per hand. The award is is-
sued free of charge and the only
requirements of major concern
are that your contacts should be
listed in prefix order, and the list
be verified by at least two fellow
amateurs.

Applicants may apply for this
award any time up to December
31, 1982. Remember, however,
that all contacts must be made
before December 31 1 1981, to be
valid. Send your application to;
P.R, of Bulgaria, Sofia 1000, PO
Box 830. Bulgaria.

WORKED LA3FUMM AWARD

The three radio officers
aboard the Royal Viking Sea,
a Norwegian ship which cruises

tku rrrttfitt that

tut KOtlAH AMITtUt fADIO Lf*OUl inc

166 73 Magazine * December, 1981

LA3FL/MM

Iffc? •••

all over the world, are offer
mg free the Worked LA3FUMM
Award.

Applicants must work the sta-
tion on CW in four different

bands, minimum of 539 RST. A
QSL card must be sent for each
band to the LA bureau or to Per
A. Mikalsen, Chief Radio Offi-
cer, Royal Viking Sea, Rusel*k-
kveien 14, Oslo, Norway.

ROYAL VIKING SEA

ftOTALMNNG HJNl

■

AUKKED

LA3FL/MM

^ * ^ M I >

c£RTinr%Tt: NR. — —

I ill- ..V KTtl IE5TH VT —

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MtMoM>iiHi.i^i>^T*«»»%if4:»ri>MM:ri^ mum r
mt»ionoi^*miTHt -\*m*fi.io U M«\i.«tfc* u\f*

W/5 RdUl VlfclV. -1 v
IftlUWi nil 9E¥£*StAS

mt cxwtacts » ntF. m *nt *s fiai 4 ■*>

!•*!*

HWI>

QTH

MICtTI"*

I—

4. — "»

— UH7

— MM/

— MH3?

VKHIHHi MHItUATEMATSRAi

AVMU)r:tSTofH-\N

\| -IIMIM VlMViSEA

FESSENDENS75TH

Ouring the week of Christ-
mas, 1981, AA1 A will be operat-
ing most HF SSB phone bands
to commemorate the 75th anni-
versary of the experiments by
Reginald Fessenden, who made
two-way contacts with Scotland
as well as the famous Christmas
Eve voice broadcasts, Fessen-
6en also was responsible for
many radio firsts as well as
many innovations such as the
heterodyne principle and high
frequency alternators. He later
was the developer of sonar.

Special QSLs will be sent out
with more information to those
who work us. We will be operat-
ing near the lower edge of the
General class bands.

Two books are available for
those interested in a famous
early radio experimenter Fes-
sendert, Builder of Tomorrows,
by Helen M. Fessenden, and Ra-
dio's First Voice, by Ormond
Raby.

BETHLEHEM, INDIANA,
CHRISTMAS EXPEDITION

The Clark County ARC, Jeffer-
sonvllle, Indiana, will operate
from Bethlehem, Indiana, from
1700 UTC, December 12 to 1700
UTC, December 13, Operating
frequencies for W9WWI/9 will be
3.905, 7,240, 14.290, 21.365 MHz
on SSB as propagation permits,
The N9RM 146,25/85 repeater
will be used for local contacts.

A special BVaMx11" Christ-

mas season certificate imprint-
ed with the unique Bethlehem
postal hand stamps will be sent
to all stations who QSL. Please
OSL with a large SASE to Clark
County ARC, PO Box 532, Jeffer-
sonvi lie IN 47130.

BETHLEHEM, WEST VIRGINIA,

EXPEDITIONS

The Triple States Radio Ama-
teur Club will operate from Beth*
lehem, West Virginia, from De-
cember 17 to December 21, from
1400 to 2300 UTC daily. Operat-
ing frequencies for WD8DDU8
will be 7.275. 14.325, 21.425, and
28.550 MHz on SSBt and 7.110,
14.075, 21.110, and 28.110 MHz
on CW+

A special holiday-season card
will be sent to all contacts.
Send an SASE to TSRAC, 26 Ma-
ple Lane, Bethlehem, Wheeling
WV 26003.

BIG SKY

WORKED ALL COUNTIES

AWARD

Recently, the Lower Yellow-
stone Amateur Radio Club of
the Sidney/Glendive area of
Montana decided to sponsor a
Montana Counties Award. The
certificate was the idea of
WB7UTJ and N7BMR.

To quality for this award, any
licensed amateur must contact
and have received a QSL for all
56 counties in Montana on any
band or mode of operation. Re-
peater contacts will not be ac-
ceptable, and all QSOs to be val-
id must have taken place on or
after January 1, 1980,

To apply for the award, have
your list verified by two other
amateurs and send an award fee
of one dollar (US funds) and two
first-class stamps to either
WB7UTJ or N7BMR.

The Kauai Amateur Radio
Club is pleased to announce the
establishment of five awards
which are now available to ama-
teurs worldwide.

WORKED KAUAI AWARD

The WK Award requires all
contacts be made January 1,
1980, or later on any band Of
mode of operation. For appli-
cants in all 50 states and Cana-
da, five KARC member stations
must be worked- DX stations
need only three contacts with
KARC members. General certifi-
cation rules apply.

WORKED HAWAII AWARD

The WH Award has the same
requirements of the WK Award

73 Magazine • December, 1981 167

except that for US and Canadian
amateurs 50 Hawaiian contacts
must be logged, five of which
must be KARC members. For DX
stations, 15 Hawaiian stations
must be worked and one must
be a KAHC member

WORKED HAWAIIAN
ISLANDS AWARD

To qualify for the WHI Award,
five Hawaiian stations must be
worked on the following Hawai-
ian Islands: Hawaii, Kauai,
Maul, and Oahu,

WORKED ALL
HAWAIIAN ISLANDS

The WAHI Award requires the
applicant to work a minimum of
one station on each of the
following islands: Hawaii,
Kahoolawe. Kauai, Lanai*
Molokai, Maui. Niihau, and
Oahu,

WORKED ALL HAWAIIAN

COUNTIES AWARD

There are a total of five (5)
counties in the state of Hawaii.
To qualify for the WAHC Award,
one Hawaiian station must be
worked in the counties of
Hawaii, Honolulu, Kalawao,
Kauai, and Maui.

Be sure to enclose $1,00 for
each award being applied for
the help defray costs incurred in
maintaining this program
series. All correspondence
should be directed to the
Awards Manager, KARC, PO
Box 546, Kalaheo HI 96741.

SANTA CLAUS, INDIANA

The Pike County Amateur
Radio Club of Wmslow, Indiana,
and the Old Post Amateur Radio
Society of Vincennes, Indiana,
will operate a special events sta-
tion from Santa Claus, Indtana.

The caltsign wM be W9CZH,
and the dates, December 4, 5,
and 6, Starting time is 0000Z on
the 4th, continuing on through
to 2300Z on the 6tht Frequencies
(plus or minus QRM): 21.410,
14,305, 7,270, and 3-925 SSB,
14.090-14.100 RTTY, and 146,52
FM.

A special QSUXmas card
postmarked from the Santa
Glaus post office will be sent
upon receipt of an BASE. Send
to Santa Glaus, PO Box 111,
Ireland IN 47545.

MOUNT SAINT
HELENS AWARD

Down the road a mere 180
miles sits majestic Mount St

Helens. We here in Washington
remember the historic Sunday
morning very well. Supported in
the community by a Naval Air
Station, we thought for sure
bombing maneuvers were un<
derway here on Whidbey island-
Instead, what we were hearing
was the explosion and the
awesome eruption of Mount St.
Helens, a devastating act of
nature which had happened
some 14 minutes earlier (took
this long for us to hear it at the
speed of sound). By this time,
radio announcers had already
received the unfortunate news
over the wire services, and after-
shocks were being experienced
which were to continue for
weeks and months to come,

The amateurs throughout the
area performed marvelously In
the hours of desperation. It
behooves all of us, sometime in
our amateur careers, to contact
amateurs from the region and
listen to the story they have to
tell!

A unique photographic award
of the M L St. Helens eruption on
May 18, 1960, is now available,
Two opportunities, with no
mode or band restrictions, are
provided to qualify for this very
popular award:

1) Contact S or more stations
within the counties of Washing-
ton that surround Mount St.
Helens (Clark, Cowlitz. Skama-
nia, and Lewis counties). All
contacts must be made on or
after March 27t 1980, which was
the actual first eruption of the
mountain in over 123 years.

2) Report one contact with
W7AIA (Clark County Amateur
Radio Club) during its operation
from 0200 UTC May 16 to 0200
May 18, 1981. That marked the
first anniversary of the disas-
trous eruption that took the life
of Reid Blackburn KA7AMF,
who was a member of this spon-
soring organization.

To apply for this award, send
appropriate log information and
$2.00 or more as a donation to
the Reid Blackburn Scholarship
Fund which has been estab-
lished in memory of our dedicat-
ed friend and fellow amateur.
Forward your application to
Awards Manager, PO Box 1424,
Vancouver WA 98668.

SOUTHERN CALIFORNIA
DX CLUB AWARD

This week I received a very
nice letter from Norm Friedman
W60RD, representing the

C&OA

Certificate Of Recognition

/// t f t tftjtraf* titt f/tr/f ft ft

(ttHftfntt hi* /tt J ft fit h

tn em ft 41 // ffa */* f/fftt at v fifth tttitt ?

fter fin witftvf ffltj tffttt t/_

- -

Southern California DX Club, In-
corporated, In his letter, Norm
announced a Certificate of Rec-
ognition which is issued to ama-
teurs throughout the world who
can qualify.

Each applicant must work
and confirm contact with 35 cur-
rent members of the DX Club on
any frequency from 1,8 to 30
NIHz, This will qualify the appli-
cant for the basic award. A
bronze seal will be issued for 75
contacts, a silver seal for 100
contacts, and a gold seal will be
presented for 125 contacts with

Southern California DX Club
members.

Verification of these contacts
can be administered by any
ARAL or IARU affiliated club. All
contacts must be made on or af*
ter January 1f 1980, to be valid.

Send your iist of contacts and
$2.00 US funds or 10 IRCs to
Norm Friedman W60RD. For a
current membership roster of
the DX Club members, send an
SASE and 2 IRCs to Norm and
he will be sure a copy is rushed
to your door.

( CORRECTIONS

Figure 8 in "Folded Unipole
for 160." on page 32 of the Oc-
tober issue, refers to an swr of
"0'\ Such a value is impossible
to obtain. The graph should
have a low point of 1.0.

Also, the review of Kenwood's

TR-900Q, beginning on page 30
of the August Issue, refers to
measuring power over a range
Of 143.3 10 148.7 MHz. This
should read: 143.9 to 148 J MHz.

Tim Daniel N8RK
73 Magazine Staff

168 73 Magazine * December, 1981

ORDER
TOLL

YEAR END SALE!

1-800-336-4799

^453

2% BONUS FOR PREPAID ORDERS

(Cashier's Check or Money Order)

FREE

ORDER
HOURS:

11 am - 8 pm (Eastern Time) Monday - Friday

9 am - 4 pm (Eastern Time) Saturday

CLOSED TUESDAYS
STORE HOURS: 12 noon * 8 pm M^W-F. 9^3 Saturday

SANTEC HT- 1 200

nlih

odbcbn

DEDD

M icnapr g*:#*sot- et>nTmil*»'1 2 it f M n*wf ■
hetrf Ki+fiXHTti f'Afinwrtc.v «rtr* w'lEO
tMpiay » 43 000 m 140 995 |T*) r0
149.995 | Raj. Ten memory channel *

progr;*m»Ti»»rt Fnr 146 52 76 B? 68
.9< id? 00. 06. U 18 & 51 |r#.
proflraflimflbfe) 5je*n .mri search, ±600
Kht olf»tr>fi4 fir nnv Odd split ising

m**T¥irny 1 ocJwdti'j Si*(? 2>i'vw<6"» h

1 . His w«thNic«dbimpfv tkn

antenna w#H ch^gf, f*#t>ttt>tii- & f tnlp

SALE PRICE

$279.00

FULL LINE Of ACCESSORIES
ARE AVAILABLE

ST-7rT440-450MH7
HandhefriXCVR

$284.95

* * * SUPER VALUES * • •

....

YAESU

FT107DM 9 Band HF XCVR, . .
FP107E External Power Supply for 107
FPI07 Internal Power Supply for 1G7
SP107 Speaker/ Patch for 107

CUSHCRAFT

R3 10-1 5-20M Ringo.

A4 1CM5-20M Beam 4-element

■ ■ ■ ■

MFJ

961 1 5 KW Toner with switch
1040 HF Preselector for XCVR

DAIWA/MCM
CNA-2002 Aulo tuner 2.5 KW
CNW-418 Antenna tuner 200W
CN-520 SWR/Power Merer 1 8-60MH?
CN 540 SWR/Power Meter 50-148 MHz

944.95

119,95

1 1 5,95

24 95

205 95
205,95

131.95

82.95

399.95

169.95

59.95

69.95

Some items in limited quantity
and subject to prior sale.

MFJ PRODUCTS
989 Nf w 3KW Tunc-
962 1 5KW Tunei mir/swnlcti
949 B 30O watt detune tune'
94 tt 300 wuti tuner swirch/mrr
940 R 300 waif tuner switd
820 SWR/waiT mtttf & sfmmcu
825 Deiufee SWR/vuaier mewr fr senaof
814 HF SWR/w r meTF?f

721 GW/SSB f.linr

722 CW/SSB filter w/noich
732 DX SSR Mil
7528 Dual Turn a Mr filtf *■
624 PHone patch
525 ft? speech processor
4Q\ Eco-no Keyw
406 Ottluve kpvfff

40ft D#lux6 kftyrtr wifb spift'flmtr. . .
422 Pares*?! (fi KiVer w/Bftrtrher BY- 1

481 Memory Keynr 2 rns.^ ...

482 Memory Keyer 4 msg

484 Graf»tfma$ii*f memary k*vm 12 m*q

496 KR¥hoafrt It

312 Poll Wpath-er converter

202 Nooe b^dgp

250 T kw Dummy Load w/cul

260 300 watt dry dummy liirtrl

2 62 1 kw dry liurtimy food

10? ?4-hour c\or.k

1103 12 socket pwr Mho

1 103 12 soelff pWF strip w/RFI prot

1104 8 socket pwr si'ip-rirru*? . .

BENCHER PAODLES BAIUNS
Stark - fiv1
Chroma • Bv

ZA-1 A 33 3D MHZ Balun
ZA-2A T4 - 30 MHZ Bqiun.

MINiQUAD HO 1

ALLIANCE HD73 flntnr.

C0E HAM IV ROTOR

BUTTERNUT Hf SV-IH 10-B0m Vertical

279 95

TB995
Its 95
74 95
65. 95
5795
99.95
41.95
4995
57 95
57 95
74 95

99 95
4t 95
57 95
6595
ft? 15
74 95
8295
115 95
2B0 95
49 95
4595
2995
2295
53.95
29, 95
2B95
37 95
4995

34 95
42 95
1495
T850

12995
91 R5

169 95
B695

CUSHCRAFT

A3 10-t5-20m 3 elem 6>am 1G8 95

AV3 10-1 5- 20m vertical 41SO

ARX 28 New Rmgo Ranqer PI 2m 34 00

ARX2 Ringo Ranger 2m 29 95

A3 2 1 9 2m Btiomer DX Bnnm 75 9S

214B SSB 144 146 MHf Boomer 6195

214F0 144&-148 MHZ FM Boomer 61 95

220B 220 MHZ Boomer 66 95

All Ml 11-Flemenl 2m FM Beam 34 50

AI47-20T 20-Element SSBFM Beam 54 95

A144 1 1 1 1 'Element 2m SSB Beam 34 50

AMS-147 2m mtpnetic mrvuni 23 95

HY GAIN ANTENNAS

TH6DXX T riband Beam. I0-15-20m 239 95

TH3MK3 3-Element 10- 1 5-20m Beam l 79 95

TH3JR 3-Elempnt 10 15-20m Beam 13895

TH3MK2 2 Elmiv^m 10 16-20m Beam 1 IB 95

18AVT/WB 10S0 VerticAl B2 95

1 4 AVQ/WB 10-40 Verticil 50 77

KLM ANTENNAS

KT34A 4-£»emeni Tfrband Btram 320 75

KT34XA 6 -Element Tnbeod Beam 469 50

144.148 13 LB 2m 13-EMmi«m wrlh btlwi 77 95

144-148 16C 2m tfi-Elf*m**nt far nacat 93 55

420-450 14 14-Rlement UHF S«am 37 54

420-450-27 27-nlemenl UHF Beam 55.95

420-450 ISC 1B-et€mBnr UHFtoroscsr, 58 70

4 3? 16LB 430- 434 MH? bsjrm/balun 00 70

AEA

rSOPOi-E Anienna^ CALL

Motse Matte & Comssi *rvp^ CALL

Hew Morse 'RTTV reaidef CALL

BIG DISCOUNTS

KENWOOD, IC0M. YAESU

TEN-TEC, A2DEN. KDK

— Call For Our Quote —

ASTRON POWER SUPPLIES
RS7A 5 amps «mtOTU0**» 7 amp ICS
R51 2A 9 amps, continuous. 1 2 amp* ICS
RS20A 1 6 amps cooTmuous. 20 amps ICS
R520M same =rs R520A + mr
RS20S same as R520A 4- speaker
VS20M samptjs RS20A+ meters Ef <iri|tJ5table
HS35A 25 Amp continuouB, 35 amp ICS.
RS35M sflmp «i5 RS35A + metera
VS35 M same as RS 35 A + meters & adiusrablr

MIRAGE AMPS & WATT METERS
MP1 HF SWR/Wall Mele*
MP2 VHF SWR/wati m#fet
823 2 m 30 nut. All Mode Amp
BIOS 10 in, B0 our All Mode 2m
R10T610.H 160 our All Mode. 2m
D1010N 10 in, 100 otai, 400MHZ .

VOCOM ANTENNA$/2m Amps
5/B wavt- 2m heml hi-lil Arn
2 watis in, 25 watts out 2m Amp .
200 rnw in. 25 walls oui 2m Amu
2 waits in 50 walls out 2m Amp
2 watts in 100 watts o*it 2m Amp

TELEX HEADSETS- HEADPHONES
C1210

CI 320 Headphones
PftOCOM 200 Hflarfsot/dufll imp, MIC
PB0COM 300 It/wl Head set/ dual Imp mic

HUSTLER 5&TV l0-80m Vertical
4STV 10-40m Vertical
3TBA 70-15 20rti Beam

HF Mobil* Resonaton Standard

TO and 15 merer 7.95

20 meters 10,95

4-0 meters 1 2 50

75 meters 13. 50

Avanti AP 15 T 3G 2m on glass ant

49 95
69 95
S9 95
105 95
105.95
124 00
13595
151 95
171,00

CALL
CALl
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CALL
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18 9B
69 95
62 95
99 95
159 95

22 95
32 95
76 95
68.95

92 50

73 95

161.95

Super

12.50
1495
17.30
27.95

27.95

ORDER INFORMATION
Orders: 1 -S0O- 336-4799

Information: |703J 643-1063

Mailing Address' 2410 Drexel Street

Woodbndge. VA 22192
Store Location: 14415 Jefferson Davis Hwy,

Woodbndge, VA 22191

HOLIDAY HOURS:

CLOSED Dec. 24 thru 29
January 1 thru 3

Prices Good Until
December 31. 1981

— CALL FOR QUOTES —

Send stamp for flyer, Terms: Prices do not include
shipping. VfSA and Master Charge accepted, 2% discount
for prepaid orders (cashier s check or money order). COD
fee $2.00 per order. Prices subject to change without
notice or obligation,

•-'See Lr$t of Advertisers on page T62

73 Magazine » December. 1981 169

SOCWL EVENTS

Listings in this column are space-available basis. The
provided free of charge on a following information should be

included in every announce-
ment: sponsor, event, date,
time, place, city, state, admis-
sion charge (if any), features,
talk-in frequencies, and the
name of whom to contact for
further information. Announce-
ments must be received two
months prior to the month in

Take your favorite H.T. out
for a drive tonight.

VISA or MASTERCARO for
same day shipment

For $64.95 you get the most efficient,
dependable, fully guaranteed 35W 2 meter
amp kit for your handy talkie money can buy.

Now you can save your batteries by operating
your H.T. on low power and still get out like a
mobile rig. The model 335A produces 35 watts
out with an input of 3 watts, and 15 watts out with
only 1 watt in. Compatible with I02AT, TR-2400.
Yaesu. Wilson & Tempo! Other 2 meter models are avail-
able with outputs of 25W and 75W< In addition to a 100W
amplifier kit for 430MHZ. ^ 332

Communication Concepts Inc. X^X"*" ■Dl¥,olt '<*HM

CENTRAL NEW YORK'S MOST COMPLETE HAM DEALER

I COM IC 7ZO

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Roaoraoo

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Featuring Kenwood, Yaesu, Icom. Drake, Ten- Tec, Swan, Demron, Alpha, Robot,
MFJ, Tempo, Astron, KLM, Hy Grain, Mosley, Larsen, Cushcraft, Hustler, Mini
Products. Bird, Mirage. Vibroplex, Bencher, Info-Tech, Universal Towers.
CaUbook, ARRLt Astaitc, Shure. Collins, AEA. We service everything we sett!

Write or callfor quote. You Won't Be Disappointed.
We are just a few minutes off the NYS Thruway (1-90) Exit 32

OUT OF STATE
ORDER TOLL FREE

800*446-9338

ONEIDA COUNTY AIPORT TERMINAL BUILDING
^*,7 ORISKANY NEW YORK 13424

►"397

N v Rds c«i! ^l^^t Hft Q<84

Warren -K 2! XN

Bob WA2M5H

A1 WA2MSI

THE

!■ •

TROUBLE FREE

TOUCH TONE

*&i

PP-1 $55/7^^^

PP-1K*$62 rZ~\*
PP-2 $59
PP-2K*$66. "16 Key"

•K series =S P.S.T. Relay with
adjustable delay
M series^ Detached frame for
irregular installation.

P3 12 or 16 key designed for
custom installation, flush mount
3 different circuits available . .
request P3 information. tATAT

An ultra high quality encoder for absolute
reliability and function. Positive touch key
action with non-malfunction gold contacts,
totally serviceable and self contained. Easy
level control, no frequency drift, operates
any system. 4.5 - 60 V.D.C., operates in
temperatures from -15°f to 160°f* Supplied
with instructions, schematic, template and
hardware.

DEALERS:

Ham Radio Center, St Louis. Missoun
Henry Radio. Los Angeles, California .
Electronic Equipment, Virginia ...**-•
CW Eiectronics, Denver ....

■ a - -«■■>*##

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(800) 421-6631
(703) 936-3350
(800) 525-6147

Cull or write tor free detailed catalog and In forma Hon guide,

Mail
Order

tpipo^ommunications

Emphasis is on Quality & Reliability ^^oo

r; P.O. Box 3435

Hollywood, California 90028
{213)852-1515 J

which the event takes place.

FAIABAULTMN
DECS

The Courage Center Hand*-
Ham System will hold its annual
winter hamfest on Saturday, De-
cember 5, 1981 T at the Eagles
Club, Fairbault MN. There will
be a flea market, a dinner at
noon, a program, and prizes. For
more information, contact Don
Franz WQFIT. 1114 Frank Ave*
nue, Albert Lea MN 66007.

HAZEL PARK Ml
DEC 6

The 16th annual Hazel Park
Amateur Radio Club Swap &
Shop will be held on Sunday, De-
cember 6T 1981, at Hazel Park
High School, Hughes Street at
9V? Mile Road, 1 mile east of
I-75, Hazel Park ML Tickets are
$2.00 and tables are 75c per
foot. Doors will open at 8:00 with
the main prize drawing at 2:00
prn. There will be plenty of food
and free parking, plus hourly
door prizes. Grand prizes are in-
cluded with the admission tick-
et, Talk-in on 146.52. For more in-
formation, send an SASE to
Jack Field W8UPU, 1444 E.
Evelyn, Hazel Park Ml 48030.

SOUTH BEND IN
JAN 3

A hamfest swap and shop will
be held on Sunday, January 3,
1982, at Century Center, down-
town on US 33 one way north
between the St. Joseph Bank
Building and the river, South
Bend IN. Tables are $3.00 each.
There is a half acre of carpeted
room in the same building as the
industrial history museum. Talk-
in on .52A52, .99Z.39, <93/.33s
.78/, 18, ,69/.09, and 144.83/
145.43, For more information,
contact Wayne Werts K9IXU.
1889 Riverside Drive, South
Bend IN 46616. or phone <219)-
233-5307.

WEST ALUS Wl
JAN 9

The West All is RAC will hold
its 10th annual all-indoor Mid*
winter Swapfest on Saturday,
January 9, 1982, beginning at
8:00 am at the Waukesha Coun-
ty Exposition Center. Advance
tickets are $2.00 and tickets at
the door are $3,00. Reserved
4-foot tables are $3>00K at the
door, $2.00, and on the balcony,
free. Included with the ticket will

170 73 Magazine • December, 1981

be a 50c coupon toward a sand*
wich purchase. Prizes wrN be
awarded. For more information,
write 1982 Swapfest, PO Box
1072, Milwaukee Wl 53201.

RICHMOND VA
JAN 10

The Richmond Amateur Tele-
communications Society will
hold its annual Frostfest on
Sunday, January 10t 1982, from
8:00 am to 4:00 pm at the Virgin-
ia State Fairgrounds, Richmond
VA. Admission is $3,00 plus a
table charge for exhibitors and
flea-market displays. Overnight
trailer parking with complete
hookups will be available at
$7.00 per night. Various prizes
will be given away during the
day with three main prizes to be
awarded at 3:00 pm. There will
be approximately on© acre of in-
door heated and well-lighted
space. Talk-in on 146.34/. 94,
146.28/.88, and 146.52. For addi*
tional information, call Joe
Stern W4LD at {804}-7374)333,

ARLINGTON HEIGHTS IL
FEB 7

The Wheaton Community
Radio Amateurs will hold their
annual hamfest on February 7t
1982, beginning at 8:00 am at the
Arlington Park Race Track EXPO
Center, Arlington Heights IL.
Tickets are $3.00 at the entrance
and $2.50 in advance. There will
be free flea-market tables, ex-
panded floor space, parking,
awards, and a large commercial
area, including the new com-
puter section. Talk-in on
146.01/.61 and 146.94. For com-
mercial info, call WB9TTE at
(312)-766-l684; for general info,
call WB9PWM at (312J-629-1427.
For tickets, send an SASE to
WCRAf PO Box QSU Wheaton
I L 60187.

LIVONIA Ml

FEB 28

The Livonia Amateur Radio
Club will hold its 12th annual
LARC Swap 'n Shop on Sunday,
February 28, 1982, from 8:00 am
lo 4:00 pm at Churchill High
School, Livonra Ml. There will be
plenty of tables, door prizes, re-
freshments, and free parking.
Talk-in on 146.52. Reserved ta-
ble space of 12*foot minimum is
available. For further informa-
tion, send an SASE (4 x 9) to
Neil Coffin WA8GWL, c/o Livo-
nia Amateur Radio Club, PO Box
2111, Livonia Ml 48151.

*-See List of Atfvertfsers on page 162

Code reading

makes ham radio

more fun!

CI J

Field Day 2

A code reader can add to the
fun of ham radio by allowing
you to copy many signals that
are too complex or too fast to
decode by ear.

you can get in on such things
as news-wire service transmis-
sions, weather information and
financial reports that are sent
by radiotefetype (RTTY), ASCII
computer language or Morse
code.

Some code readers only copy
one or two types of signals, but
the Kantronics Field Day 2 tm
allows you to copy rtty at 60,
67, 75 and 100 wpm. ASCII at
110 and 300 (if sent as It is
typed) Baud and Morse at 3 to

80 WPM.

The Field Day 2 even has an
editing program to improve
sloppy Morse, you get more of
the message and fewer illegal
character signs tnan with other
code readers. With a Field Day 2
you also get a 24-hour clock,
code speed display and TTL
compatible demodulator out-
put.

The Field Day 2 is a complete
unit in one package with a large,
easy-to-read, 10-character dis-
play and is backed with a full-
year limited warranty.

Code reading makes ham
radio more fun, and now you
can get started wich one com-
pact, versatile unit, at 5449.95,
suggested price, the Field Day

call or visit your Authorized
Kantronics Dealer for a demon-
stration!

Kantronics

(913)842-7745
1202 E. 23rd Street

Lawrence, Kansas 66044

TOWERS

60- FOOT
INSTALLED

73 Magazine • December. 1981 171

USED GEAR

* 70 day Trial (pay only Shipping Charges)

* 30 day Warranty 9 25 81

* Full Trade-in within 3 months on New Gear

* Mastercard or VISA welcome - Call Today!

AMCOMM

S-225 2m FM Xcvr 11991
AMECO

PT 2 Xcvr preamp $ 59 v
ATLAS

350XL Xcvr US9m

350X1/ Digital/ 305 4891

350PS AC supply 1491

DMK-Xl Mobile mt 29 m*

210X 80 IQm Xcvr 3591

210X/LE 8010m Xcvr 399 m
215X/N8 160 15m Xcvr 369 m

AR-200 Power supply 59 w

200PS Power supply 69 *

110L Xcvi (RX+TX) 199 mf

PS110H 12v ps 69 m
CLEGG/SQUI»ES SAWDERS

Interceptor Receiver S 99 m

22V FM series 25 69 m

FM-27B 2m FM Xcvr 129 e

Oil Power supply 29 w

Desk c&r for HT146 9w
COLLINS

75S-I Ham flcvr $275 mwf

75S-3 Ham Rcvr 375 mi

75SS6 Ham Rcvr 450 wl

75S-3B Rcvr (round) 4991
F455FA0S BOO Hz Jitter 99 w
F455FA3L 3.1 KHz filter 79 *

515*1 Rcvr (round] 1195 a

3251 Transmitter 275 f

325-3 Transmitter 425 mwi

32S3 Xmtr (round) 475 m

5I6E 1 KWM 1 DC ps 69 f

35 ID I HWM 1 mount 49 w

KWM -2 Xcvf 499 m*v

516F-2 AC supply 175 mtv

CC-3 Carrying case 49 m

351D-2 KWM2 mount 45 f
DENTRON

160-lOATSkw Tuner I S3«

Jr Monitor Tuner 39 a

OTR 3KA Ant tuner 279 e

OTR-1200L Linear 349*
DTR-2Q00L Linear (air) 799 m

W2 Wattmeter 69 w
WVP2I VHF PEP meter 49 m

AF-1A Rev audio proe
DRAKE

SW-4A SWL Rcvr
2A Ham Rcvr
2B Ham Rcvr
2C Ham Rcvr
2AQ Spkr/Q mult
2BQ SpM/Q-rnull
R-4 Ham Rcvr
R4A Ham Rcvr
R-4B Ham Rcvr
R4C Ham Rcvr
MS-4 Speaker
4NB Blanker
FL-250 Fitter
FL-SOO Filler
FL 1500 Filter
2NT CW Transmitter
T-4X transmitter
T 4XB Tiansmirter
I-4XC Transmitter
TR 3 Xcvr
TR 4 Xcvr

69 wl

$169f
129 f
149e
169 we

29 e

291

229 mtr
249 m wl
289 mwtc
389 eve

19*e

49 e

35 e

35e

35 e

79 *
249 m*c
349 w
399 all
229 m
299 mwle

TR4/NB Xcvf

349 mve

Tfi4C Xcvr

379 mwc

RV4C Remote VFO

S9m

FF-1 Xtal adaptor

19 1

TR-6 6m Xcvr

469 w

TR-6/NB 6m Xcvr

499 e

AC 3 AC supply

59 mwfci

AC4 AC supply

89 ail

DC 3 DC supply

49 me

RV 7 Remote VFO

139 m

WH-7 Wattmeter

89 m

MN 75 Ant tuner

179 m

14 bnear amplifier

599*

R 7 DR-7 SW Rcvr

999*

TR22 2m FM Xcvr

99 e

TR22C 2m FM Xcvr

119m

AA-22 2m amp/preamp

49 w

UV 3 |2m/450l Xcvr

499*

UV 3 (3-uamJ| Xcvf

699 c

ETO

Vomax Processor

$12$ m

ENCOMM

HI 1200 2m FM HT

S239m

HALLlCRAFTEftS

HA 1 Keyer

% 49m

HEATHXIT

SB-300 Ham Rcvr

Sl69c

SB-301 Ham Rcvr

199e

SS313 SWL Rcvr

169m

HR 1680 Ham Rcvr

99 m

HS 24 Speaker

KYGA1N

3750 Xcvr

£599 w

JRL

FSK-500 Demodulator

$169 m

ICOM

IC 701 Xcvr

S599*f

1C-701PS Power supply

99 wf

JC720 Xcvr

B95 w

PS- 15 Power supply

99*

IC-551 6m Xcvr'FM

399 m

IC 22S 2m FM Xcvr

149 mc

IC 21 1 2m FM Xcvr

399 R

IC-245 2m FM Xcvr

239 mv

IC-280 2m FM Xcvr

239 w

IC 202 2m SSB port

169 e

IC 202$ 2m SSB port

189 m

IC 3PA Power supply

39 m

RM-2 Program r

69 r

KLM

661 6m Xcvr

$349 rn

2 708 2m 2/70w amp

79 *

4 80BL 2m 4/80* amp 129*

10-708 2m 10/70*

89 e

15 80BL 2m 15/80*

119*

KENWOOD

R-599 Ham Rcvr S199fv

R-599A Ham Rcvr 229 m

R£99D Ham Rcvr 249 mf

T-599A Transmitter 269 m

T-599D Transmitter 299 mfv
TS-900 Xcvf/PS^OO ps 399 m
DS-900 DC supply 69 1

TS-120S Xcvr 479e

TS-130S Xcvr 529 m
PS 30 Power supply 99 me

TS iSOS Xcvr 499 1
VFO 180 Remote VFO 99 e

AM8Q Ant tuner 129 m

TSb20 Xcvr 449 c

TS-520S Xcvr 449 m

TS820 Xcvr 499 f

TS 82G/DG1/CW lilt 5991

TS820S Dig Xcvr 599 ml

1SB20S/CW niter 629 m

TS820S/CW lilt/ DC 659 m

SP-820 Speaker 49 1

AT-200 Am tuner 115*

R-300 SW Rcvr 189 mfc

R 1000 SW Rcvr 299 m

SP100 Speaker 29 mw

TV 502 2m Xvtr 179 m

TV-506 Sin Xvtr 179!

TS-600 6m Xcvr 439 e

TS-700A 2m Xcvr 3991c

1S-700SP 2m Xcvr 4791

TR2200A 2m FM Xcvr 129 ml

1R-740QA 2m fM Xcvr 239*1

TR 7400A/CES scanner 269 e

TR7600 2m FM Xcvr 199 mw

TR-76252mFM/TTPmic 269 m

TR9000 2m Xcvr 349 m

TR-8300 450 FM Xcvr 199 mv

PS-20 Power supply 49 w

iFJ

949B Ant tuner S 79 m

961 Ant tunei 99 m

982 Ant tuner 129w

989 Ant tuner 199 m

721 SSB/CW titter 29 v

751 SSB/CW hlter 39 we

ilCROLOG

AVR-1 Demodulator $349 m

AVR2 Demodulator 499 m

MIDUND

13-510 2m FM Xcvi $229 mlc

13-510A 2m FM Xcvr 249m

J. W. MILLER t DAI WA)

RF440 Speech proc $ 89 m

MIRAGE

MP l PEP wattmeter S 69 w

NDI

HC 1400 2m FM Xcvr $199e

PALQHAR ENGINEERS

RX noise bridge J 39*

VLF converter 49 w

REGENCY

EC-175 C04jntei $ 99 m

ROBOT

61 Viewtmder $175 m

70 Monitor 175 w

30 Camera 179 m*

SILT RON IX

70OR Custom Rcvr S199m

STANDARD

H6 2m FM HI $ 79 m

C-US 2m FM HI 79m

SWAN/ CUBIC

22 VFO adaptor S 19 mv

412 DC supply 29 m

P 1215 AC supply 49

IO0MXA Xcvr 349 m

Astro 150 Xcw 569 w

PSU-5 Supply 129 mw

I02BX Xcvr 599 e

PSU 6 Supply 139 mfe

300B Cygnet Xcvr 329 m

350 Xcvr 199 v

350C Xcvr 289 m

500 Xcvr 249 f

500C Xcvr 269*1

SOOCX Xcvi 299 f

HF-700S Xcvr 329 f

11/X Basic AC ps 59 m

117XC AC ps/spki 99mwtv

230XC 110/220 ps 95 m

PSU 3A Supply
14-117 DC supply
600 T Transmitter
600R Custom Rcvf
1CAF Audto notch
NB 500 Blanker
250 6m Xcvr
WM 1500 Wattmeter
irVM 200A PEP meter
WM 2000 A PEP meter
TPL

702 2m 10/70* amp
1202 2m 5/80* amp
3 At 3 AD Nonreg ps
TEMPO
2020 Xcvr
Tempo One Xcvr
AC One AC supply
VHF One Plus 2m FM
S-l 2m FM HT
3*11 2m HT/TTP

U9t

991
249 le
249 e
19m
29 r
179 wf
45 m
59 m
69 m

$ 69m

89 m
39 m

$499 mo
289 mv
89 mv
1891
169e
199*

TEN TEC

200 VFO

$ 49m

505 Argonaut Xcvr

199 mv

206 Calibrator

19 m

208 Ext CW filler

19m

405 50w Linear

119m

570 Century/21 Xcvr

239mw1cv

574 Century/21 Digital

289*

670 fteyer

19 mw

276 Calibrator

19 mlc

540 Xcvr

3991

544 Digital Xcvr

449 w

544 */CW filt/NB

469 m

252G AC supply

99 w

262G PS/VQX/spfcr

99 m wf e

252M AC supply

99 m

262M AC supply

99 m wie

207 Ammeter

242 External VFO

99 w

244 Digital display

99mwe

247 Ant tuner

49 m*

Omni A series B Xcvr

5891

Omni D series B Xcvr

689 mfc

252M/0 AC supply

99 mf

234 Speech processor

99 m

214 Microphone

25 m

285 CW filler

35 m

VHF ENGINEERING
BLC10/70 2m amp $ 69 e
PA 140-30 2m amp 99*

YAESU

FLOX 400 Transmrrter $249 e

Fft'lOlS Receiv 249*

FR-101 Digital 299 m

FL 101 Transmitter 329 m

FT 101 Xcvr 489rn*f

FT- 101 B Xcvr 499 n

FT-101E Xcvr 599 all

FT-101E w/DrV hlter 629 m

FHUIr. w/AM hlter 629m

FT 101EE Xcvr 549 ml

FT-lOlEE w/processor 579m

FT101EE «/CW f 569 «

FT-101E1 w/CW hlter 529 m

FV-101B Remote VFO 99c

SP 101PB Spkr/patch 49 c

FT-30LS DIG 20w Xcvf 369 w

FT-301 DIG Xcvr 469m

R-301AO Dig Xcvr 469 1
FP-301 AC supply 99 m*

IT-30TD Delude ps 149 mw
KV 301 Remote VFO 89 m

U-301 Phone patch 35 m

FT-7 20* Xcvf 329 mc
FP4 Power supply 35 1

FV-901DM Remote VFO 289 m
SP-107P Spkr/patch 49 v

IV 107 Remote VFO 99 me

FT 707 X 549 .

FT-221 2m Xcvi 349 m

FT-225R0 2m Xcvr 499 e

CPU-2500RK 2m FM 289 mv

FT-207R 2m FM HT 199 e
YC'3550 Counter 99 m

Singer Gertsch

■ H

Co mm urn tat ions Generator/ Monitor*

We have a FM 101 n HUM 1U fiM-3
& ODM i fUr $4995°* aiHl * FM IOCS

tf M 10A FIM 3 & OOM-1 lot
S59955*. Snoj iriese umL were ^

>ur shops only they tri n very
,'uiai-; iHiiiiriiii! (in-vrrusudfui mobile
or porf iansl M- ■•• Stare

(1) Ihib l prepared from an in venter i taken on the date *ho*tt '

letl Itfif the prices indicate -n Atnch store t was located at

thai time the quantities vary, In somt several ul an item

lers, only unc- D\te to the lf»d and dihiobuiwu time ul tttii publtpafcof!

ne ot the items may ha w already Oeen sold by thfi t> I eetiiisad

HuAever due to the number ol \t* volved m eac& Jj> sot

<n stock tftat .: ■ led (?JV, m

po-' applies and accessories only witfi matching transmitters or
tr^nsceivi . pendtng on mt stock situation (3> Son. sedgeai

serviced after we receive your order Pleasti^illowfara few days delay m
.uur order (4)Mo Irddtson used >]eai (5) Used^ear [ douul

apply to Heh Equipment special. Qoseuat

STORE HOURS: Mom. Tue, Wed & Ffi 9 5 30, Thurs 9-8, Sat 9-3

(Us Vi*^ds & Clij.i[rt<tter stores NOT opwi Thuisilay evenings}

EXPANDED WATS PHONE HOURS: EvCfl lhaugh «ra have
multiple WATS lines itijny customcii. iepoi1 thai in«y have
ifouttk- getting tmough especially on Mundav^ Lines are itiss
ested atieinoons evenings and towaids ltie end ot ihe ws- •
To serve you Deller the Milwaukee headquarters will answer our
Nationwide WATS line 1-8O0-S5B-0411 until 6 pm (Milwaukee
lime) Monday trffu Thursday Orders- piqued Thursday evening
can be shipped Friday and be in transit over the weekend

Location

m * Milwaukee, Wl 53216; 4828 W. Fond du Lac Ave

ckliffe. OH 44092; 28940 Euclid Ave

= Orlando, FL 32803; 621 Commonwealth Ave ....

= Clearwater. FL 33515; 1898 Drew Street

= Las Vegas, NV 89106; 1072 N. Rancho Drive.. . .
= Chicago, IL Erickson Communications (Associate)

Local Phone

..{414)442-4200
..(216)585-7388
. . (305) 894-3238
..(813)461-4267
..(702)647-3114
..(312)631-5181

Nationwide
1-800-558-0411
1 800 321-3594
1-800 327-1917

1-800-634-6227
1-800 621-5802

In-State

1-800-242-5195
1-800-362-0290
1-800-432-9424 ^

VISA'

172 73 Magazine • December, 1981

FACTORY-DIRECT INFLATION FIGHTERS!
PRICES SLASHED DRAMATICALLY!

MULTIMETER WITH
FOVWR METER
MOO EL MM- 1

The M*H « rt^i quafcty JOiS-ofwVVDC Muftmrtet uwofeai
ffv SWfl/flBttCf Meter* w*fl E3y axswcOng the artraorul
cxjf*r urvt ncKKJed

12. 6, JO. *2a 400V fJOK-OfttrvVI 2 3%
0 - 6, 30, 120, 600V |BK<ihm/V> i 4%
0 — 60uA, 3. 300mA * 3%

ftur. Rxta Rxiic

—20 — «lfl 0 — *32dBm

?OQpF — O.SuF

0 — 01, 10, 100mA

J 5 — ISOMHj

IP J I

o — 2a 200. iqoow : 10%

. DvrcbonaJ coup*? unt wtfi 'etevanc

canrwior cacfe (nt toMb *«g tia&rry

« t'|W1 ■ 6 *~|HJ ■ 2'fO) Moltmetrr

4U-TW) * 2*"JH| ■ JlDf Cc*4*ct

106«» |4gQcj<tfTi)| Mu^metEf

0 75 Ito (340 grjmij Coupler

DC Volt 0 — 03,

ACV0JI

DC it A ......

OHM

dB .

L_' ■ i . ... K b. «

frequency Cwrrage

Atceucv included

D«tipriiM3ra

fs*et *e>^nt t.....

StM? « POWER METER FOR KF/VMF BAND
MODEL PM- JM V Ma

Htghqurtty SWfl/Waa. meter drugnfti^SUl? ana power un
tie measured inrfe^xJentiy ai a WW UAlft meter rilumirtittGn
*XI "Ovtne-Aif mdKJtor tamp

Sp*<JfT catkins:

Prff jueocy Coverage

RF Rawer Range , .

ftower Source
Accnsory JnciixJetj

DwrneTSjcrts

n — ISUMM/

0 — 20, 200. f.OOOW, 3 ranges ' 10%

accuracy

17V ACytX | to/ meter JllurnirviMon onlyj

7ft long comecUx catrie wim Tuir

Ibt rfmet flUmnnaooni purpose

5MM A POWER METER FOR HF/VHF BAND
MOOEL Ptf*HV 130.

Compact ,ind fcgrt twtgnt SUffi/Wsf meter drvgned far
mocme oper^oorr as wen m rxne stacon use

Specific** lom;
Frequency CoveriHje
HF Ftowt1 r Hjnge . .

^cceMOfy Included

Dimensions ,
Net UfeKjrit

3 — ISDMHj

20, 2oo, i .000*-. i range j to%

Accuracy

. . Vf/tio doutiJe tak*tk adheiiwf
mounting for rnncnlr inscaJlflDDn

I lb J044 kgjj

Mfg. toyx akIGAIM* ELECTRONICS CORP, ■ EAcluitvc Dlnrlbuttru McCAW ELECTRONICS, INC. » P.O. Bom **; Crlib*d CA

*j" 56 n fJu riot 'in ImIi i i

92004; PnorMl |7»4) +34-I07A; TELEX: lfll?43 MACAW CSSD

c and Mflrifihnij gnd an? subject (□ ciwnge1 wtflipul noCKC

zrFrom

-MAGAZINE

THE

MOST

UP-TO-DATE

REPEATER

ATLAS
AVAILABLE!

INCLUDES:

•LISTINGS BY STATE AND COUNTRY
•LISTINGS BY FREQUENCY
•MAPS FOR EACH STATE
• 28 MHZ THROUGH 1296 MHZ
•PERFECT FOR MOBILING

•WORLD REPEATER ATLAS -BK73 15 Completely
updated, over 230 pages of repeater listings are in-
dexed by location and frequency. More than 50 maps
pinpoint 2000 repeater locations throughout the USA.
Foreign listings include Europe, the Middle East, South
America and Africa. S4.95.

IN STOCK AND READY TO SHIP

'Use the order card m the back of this magazine or itemize your order on a

separate piece o( paper and mail to: 73 Radio Bookshop • Petertoorougrt NH

03458. Be sure to include check or detailed credit card information. No

C.O.D, orders accepted. Add $1.50 handling charge. Questions regarding

your order? Please write to Customer Service at the above address.

Please allow 4-6 weeks Iqf delivery.

FOR TOLL FREE ORDERING CALL 1-800-25B-5473

%fett^

ORBIT is the Official Journal for the
Radio Amateur satellite corporation
(AiviSAT), P.O. Box 27, Washington, DC
20047. Please write for application.

For a FREE SAMPLE COPY please
send $1 to cover First Class Postage
and handling to: Orbit, 221 Long
Swamp Road, wolcott, ct 06716.

See List of Advetusots on page tS2

73 Magazine • December, 1981 173

Yuri Bfanarovich VE3BMV
Box 292
Don Mills
Ontario M3C 2S2
Canada

OX BULLETIN OF THE MONTH

As we have mentioned in the
past, it is extremely helpful to
subscribe to one of the bulletins
in order to be in touch with what
is happening out there in the DX
jungle. To show what one of the
better OX bulletins looks like,
let's take a look at The DX
Bulletin.

It's a weekly publication
edited and published by Jim
Cain K1TN, a well-known DXer,
contester, and "well-cooked"

ham. TDXB provides fresh and
up-to-date information about DX
activity, happenings that relate
to DXing and contests, notes on
equipment and conventions, re-
cords of stuff worked on the
bands, QSL information, and
notes on propagation. All in all,
it's a very well-written publica-
tion. The subscription rates are
$26 per year for W, VEt and XE
(others: $35). The address is 306
Vernon Ave, Vernon GT 06066.

Well, Merry Christmas and
Happy New Year! May you work
all the new ones you still need!

WELL-COOKED
OR INSTANT HAM?

During my summer vacations,
thanks to the lousy rainy weath
er, I had the pleasure to visit a
bunch of really nice hams on
Long Island (NY). Among other
things, I also had an opportunity
to lay my hands on a Signal One
CX11. What a machines It's very
tempting and makes you feel
like mortgaging your house to
get one.

The main thing I would like to
highlight is the people — true
hams— whom I had the pleasure
to meet. What is the big deal
about this?

What we are witnessing today
is an influx of new "instant"
hams who are the products of
ham colleges which have all
kinds of instant miraculous
ways to get you legally on the
ham bands and talking as soon
as you can. Let's have a look at
this group. Typically, they are an
outgrowth of the CB generation
in which, to get on the radio, all
you had to do was pay your
bucks and get the best (most ex-
pensive) radio, big "shoes/1 and
a tower. Typically, too, they got
red up with at! the regulations
and quickly found that there
were more frequencies around
than those they were "forced"
to be on. So here comes the vfo
and 1- or even 10-kW amplifier.
They start using their "freedom
of speech*' all over the bands, in-
cluding commercial and ama-
teur. They usually talk about
nothing— and they can do that
for quite a while.

Then comes the discovery
that there are hams who can use
vfo's and kilowatts legally and
that things are more decent on
the ham bands. You don't hear

so many carriers. They get in-
terested and some of them sim-
ply retune their rigs down there,
pick a callsign, and you know
(he rest. Some go and take
courses, "suffer" through the
"nonsense," and finally manage
to get their tickets. You can tell
them from the crowd if you
listen in the pileups: they usual-
ly call for five minutes without
stopping.

Our compliments to those
CBers who are basically taw-
abiding, got fed up with the
mess around 27 MHz and then
got genuinely interested in ham
radio. They got their licenses
and tried to learn as much as
they could. They discovered a
whole new world and enjoy
learning more about alt the
aspects of radio communica-
tion: equipment, antennas, pro-
pagation, etc. They are a
welcome contribution to the
hobby.

If we look back a few years,
when CB wasn't around, the sit-
uation was different. You usual-
ly started as an SWL or by see-
ing another ham's station. The
process involved not only talk-
ing on the bands, but also a
great amount of interest and ac-
tivity in designing, building, and
experimenting with equipment.

The DX Bulletin

tSSVI IQft lIFTDSim II. L48L

rnru^TiMi i*» it, i«i» bora*.

*** JU. U* fcml, &*p :-. itfh/La* fct-
Ml. Sap U, liih Ug-m BHHM1 I*? 23.
illkLu. t?ra*}, Uf Z*. Iifh Hihm:;
'*+t *i, lLffc/L» *«rul, W* J*, 17.
■ tfh Bar** I. hv 24. fU»ft7Aavw Vontl .
*«T ?*, Hiih/lnJ* tonal; lap 10, R'tgh,"
AW* Bursal; <Ut I, flUgh N«rw*U ;ltt I*
UihU/Lii* Kami; Oil J, lii„li formll tet
4, *, Afcwy* N*>tH*Lr TNI MU<

t, fit AKDPPfi

*n4 f«w coal* h*ai it tat MttfS l**t l*t-
ur*By **i ni Lhaufa li »**w4 tba

wtt*i* merit *** tipirnmii "vrmo* v

■ t/m

tm UK mj »**■/

LTLAIfcl w*a * d«*aiaat tat lu* niiim
RtCftgtuI "t *.,: Hudion and at bat a*»-
kli ut th* ^-rui|( ndio cluSij til* j irii
a«G up miialjr |u w.'ik a Eh 1 tie be ttatfDn
m .fcfjiciu, irtniL-h tfjp *L|rvin* "CIEr'V Thai
runt act U*(<4 tm Biautu, full avail fcj
(ha pra-irraatad acbaaliila with WJFwB •
taw other at arum*. iac-ludi,ai ■ club ala-
lia* 4m w**JU«|fua HVtC *A4 a at At 1

i"*a chain lain*, tl iffaH ifcat
h4B*ra4a *E .Hail bad heir 4 p| th* frla*'
ita-i tehaaalr ««ti ii* *it a-j Mttltaal tai
C*ll tro*- Ifcidpot *** Sip tpimrd Tl-7 tivm

■ | •

While mig ininfnal auttiut l**t ion lm
I tir rraniBitunna had he an untamed, M
*aa iiiUJ*«i Ifcaj itinat cm I « La would iv
h* Kuunt ii j i ■ i t anybody ha IIICC; that waa
not I ha Ida*. Th> lJ*p wa* to aaka a |*if-
Ibat ftteaklbitrtjfcB LJwtrd *•»► OtirHM *aaV-
taji oawratigii* in th« t«tur«. Apaaraintlf
m lh«t raapaxt tba op«t at tam «aa a attd
Tha atat-iiM taaU ha faaara *r tht

n ¥QIUMU

«irh Aaaat «vWnM • mil b«f*' iro» Poland,
tapurta ttir cuiiwaul iOh ti a mi«Liil«d nvir tha
5f4Mi club g|tJ -tj irttitharn Fa Land via a
iHiccrit , wiEh iavaral hundratt haaa ttt it tan-
4*ILC* dal^ll* tha tlk£fa««tn|kp 4«cp«r«t*
UU*ii3q lha)la. at i ha *■*• na-. Eha

nsllaa a-r tB« ktidantf Laitm waa haiftj
aaW at lb* o|b«t anal n( lb* till at fa. m
tha tAlttc Saa tu«t,

lie* BBda olMwi J .000 cenluta feiaaaa U

aJ WitC. ttua tba boa* at trnOl, and
n^a i #c ad * I Lt.ll* tm an 1 Hilar* tinplta
uhly, ftn SI1 tapaatata yetj. tkaapUe HMtt|
hwinrhraa radloa Hid itrVaraTVi p[ ab] uu , aaKiitu
P^land'a J.iKiu lia>u '. uut a[ ibtai J5 slUu-h.
eitltaiiai ixilkui radii> ia aliva and wa i L

< ilidi ;iii«u[alLcn alaaallait a
■otitra- i i^in id tiarapai that tf.l. Dlaii At*
w*i» twvd dua ta raaaiiiiTH "hi 4 pww* r."
AJitt aa«^2i a -■*■ ^1 th* tail t-mtn aaat
■gltlr^laaWDa aiT*fh aravrai «r laa lo-c*l
Mbtr* wn tuattf pl*«mlBf iacv taavra aoi
auaJ aaiaimaa.Pvlaa a*a *i*o nof ^aE !
inlattataA id -uwing thair mm* pi:ail«cta
tm »TT! axid 55ff -

WqUlL'C OfiUVfcNTHtN

tunvBDrian cMtiun ILfltM raparti ibmU
IW »ttan4faef latt a**k*n4 twt tht* leaf
euan^i( avefu . J.>va about ta* pv-icanc Ira*
T"»;.-vi* jaara. fawttal Bwaiiaa «u
vl tM ara> ■ J=a by Hich QrtliPTs,

ia%lTL\ aJ iIpAa aaapLttMira. ami k*
Atctslr». «■!£?, a*al *f«4a aa anlvblLU let
•0 aaat IwJ BaEat*.

Tba J]Jt HK Or TM It*.* etnvn a** plactd
Lin rua daaarvint haad uf nl Inj HarreT HIAI,
vIid via a Liu awardad a apecial 1 ruptiy Uuh-

had th.a "(la.|Matai Uanga Ay. .J." Tl«

Ll a l-jn au*T4 t*in| tatk U' th* aarv ba-
ftnaini uf tba USUXCC CcnaanttLiD.

aalt wa* rrpraf*vt«4 abli by fan 5«ircl!»
¥1A1U. aaiil* th* aaatiDf waa mat;a4 «p
naataf anUf tj*t tmftwmtmtmXiwWM ::a Ii-
4i«na laaaai Jtv» ( *i laaaqaoii ■ > . Kitvadit
laafka like a it»ii| Ji batapv; , ailh aar.t ta
•ttfftdanc* iivw that a*t r*p*l it an art*,

Tl,. Ul N-il*.ri« iW*f( ttnaiHTT I w
mwUy In fat |w t1* "■ ** *M*.i C

■Md WMUru. il> H|JKM» ||9 *ti PMI f^ t*\

HhWh u t Hi I I «■ Id* V*raaa 4p* \i
Cf ban** *m-jm*-tm+ p»i^i p^nl ■■ tqwa
CT PtaTTaJATTlaV hal iBBta - 1* fU

012TIL and OtltTA km baa-p *att a<*
tiaa *n Inaif Pacific qftat ■ 1 1 cmi . fine
/KHh Amtlcih Ihpi. laml wik ■* U'JT*
HLua- Thav war* a La tad ta I in Lab up
rha ta about tap 1 5 and [ban □ pa rata In*
Ton(* *J3 or Ihhalau 1HT until th* 2 (at.
Altar thai tba laac lfgt at tba Etlp allt
taclvda tba Kiribati* aaat baatisly mmuv,
TcBtix acttvltr *a«aai ta baa* c*aK*«-
tTBtad an Ol aarf they baa* h*«a wiiatlt
aaaily ea m»*± 40 aaat aO fetaia.

DJhSl atattad hi* Atticaa aprit a*
irKadula Jrna) 1V7IL Sap tl and vu *■-
yaejt#d to appaat froa Vniia aa ITZAa

*a p It- IB. than Icltb tha CaaarcuLia TJ
and finally hLa i»t twu daya Sap 1)
and 32 ttvm iimbua. b> [»l^rai tc Ca r -
mat iap 24- OH to DC9IS for all-

-TH tt 1131111711 lEPTtHttt It, IN I

f La** til uniii. tSTTj baca ^ in*
It-a^aa, »*y* hi* IfMTI tfparattsf. vaa

JC> hatel* a«lr ahal IC Dlimii liaita-

tioai, tart a* ta hinttaf aaatbar atc^r

ta TufiiaU «ay act. b* |*j *it¥ aaai «1

a 1 ba vi 11 b* pi*par*d for all basda at
that Cf

Riiawra tnncarnin( Alltani* nmr ■**■
el> ctitut a,rwwDd kAflAJC, ah(* claiaai ta
hfa* 4 lieahaa tot ZAlUAH valid Dae
4-1* uf Utii aa«f. Ocaar ffaaiah

taafciao* ta h aaatieaad ta '

-lis lb* pftv^i.

r»tl»aiajj tba it ao«.**afaI
JMa-a off e at ion , f*pa?iO aarf r>Tg aaat* j

• urprn* apyaaiaaca f roai B>WiTE;a &n
tba ie vaj thoaa + aifnisi PMPLO; tba
wpp rat it™ aaaaa ta h**a rua snip a day
or *...

A ^.oaBBiaH) r at lv* gp*r*t mn ia plun-
upd tfaw fcHwau'a Paarl Karbor, t*

• tpi fJaalT D*c *, 5, aad f .

ia 49 ta
it arr • , . .Ti

bka lata ia alliaa

tot*

lacfesifaa it
» thai; rt*%-

aa ibu

t* tall Bt*Ktaa* a* b*ax*

iMToey am Tea taad, 1:

tut, Cautt V.i. *iacic-na at* puttinf btf

aipaala into fca tana 1 an. thpy 4w't p*p*

ttj haa? hL«. tat* ah*n ha doaa work

■ oaagnp a* |*tl * mptr4 r*tH5" . FEthajn

rhuaa alLigat^Ta have ak|r«t«d dovn f ma

}0 Wa; Toaj p1p« mi ■£■*■ b l g aLaaata an

c>i«tnm out of th* St at p • on 4 Halatt. «a4

ha haa haaa. Pal* to HBfa a f*W of th»B.

ft* DKEC il baa baaa annciunrad Lhat

AfJKL'a I*«dqu*ftKI MMtda CoaaUtta* will

ba ppti ins. l dtc* 1. upparantly ■ IuCut* rat hat

thin tatroactiva una 1 aflat irii Lch e radii
for aiailp-acida aaarda will b* |lvaa onlj
far QlLa afaicb claaily atata "J-^ray qB.

*• it

ai(bt b*

TaAef paTarp3 so^ithi (Of *
ta apfujar ia QaT> a
I. IM2 fat tba

fo!

rala*

That aaatlaaVaah naaarcd far tarty tbU
seeth a»T actually bappaii, bvi Ih* data* ate
Octabar 1 3— 1ft, aceafdi^a: ta JMClE ol Eh*
"JABi D£5tou(P.H Thay don't hava a callflita
yat. JU1RDC ia th* jroup IkJh, anil will
ba accorappnicd by JABHWU and aavaTal athara,
*hv vLll ahara opa rating chat a a ua 90- W
HltCtl aiai poaaibly M HI*, C* «fld 35ft,

Inn taatft, MOir aad Critada ailL
aparata fraat TsrtcLa* 9= it i ah tfiryla: t«.
acaia dtia yaat t<>t tba CQ Rwaa Cootaac.
Thta will b* Tarry* a aixth atraicht aff*ft
fraai Artaj [a* la V>;TTal).

b&4 Se . Pibttp Mill aaaib ha the <Mtia>
ttiotl t>1 WftUJ Oct 90-111, In th* conpany of
KtCJy. WBiJRt and VtftZJY. Ttiay will ha on
80-10 Hater"* no Uaii.

In Iipop iOT wantiCTn wa* aad* oT th*

it Ca&vattt tea latar thia atoih.
*f a Bliia ilum o« tba IH4 NICC Z£
rhaiPai' Csataat fp*T*tioa. That ath,
wa* th* 1M0 tea acafa bkat a*4
■:. ftll-ciaa ii,jii Tiat ftwaatl an;; S* .
laaata ta tba It?* fTZtC aailt t-awUi, Sertf .

What haa happanad to Tl LbCU aad LUlZt aa
SoiiTh Spndhaicht Anyan* know? «« t*twrtp
of flit*Mrt of thai* tlatiDUB in ion* tta*i
Kany it ill need.

HO Ha tat* if M.\ttMtj aajltint tatrr a^bd

La antietpatLaa of th* Uiatar Dl mmaaan.;
it «*d XL atatiaaa haw* baaa taauot rhrwitb
U tba ftaat Cawt B.S- bJbbbI 9M0Z. At
tba ***■ tlaa* 10 Hitara, at th* atbai aaaf
ot tba tuactras, twnuaai up *LiaBblijjc
act t award autaaaa aroaaaatim* tor * i aaajla ,
U*t Waakataj lb tba anfkad All Eutfif* 'till,
\9 waa »£tll*nt th* first day but on Sun-
day only USSft aiatiuni ha4 dtcpat pigtialp

And 11 K^nc iibaarvad in a rate at iaaua
ct tha NaEipnal C-jateat Jcutaa|_, [ftC i*

■win] to ** vary intaraattBf lb I* yaar with

f.Wi aLlewad; aew wa will **a who waa play
tag fair Ih tba aaat aad aba vaas'il

174 73 Magazine • December; 1981

A number of inventions were
made and hams contributed
greatly to the art of community
tions. Quite often seemingly im-
possible things were done. This
is the true nature of amateur ra-
dio—experimenting. These peo-
ple appreciate the privilege of
being able to communicate
around the world and want to
preserve and not to destroy it.
They are self-policing and stick
to the rules, regulations, and
ethics. They are always gentle-
men. They are not afraid to
experiment.

This spirit is still alive and I
had the pleasure to experience
rt during my visits while I was
down in \AMand. The "Old Ham"
has some sort of home-brewed
antenna, a scrounged tower,
and good equipment which is
quite often modified commer*
cial or home-brewed. He is keep-
ing up to date with technology
and that gives him the edge in
the pileup: His receiver has bet-
ter selectivity and his antenna
gives him an extra dB or two.
This is what makes the Old
Ham: experience and equip-
ment. He hates lists because
they are degrading the whole
idea of the DX sport — chasing
and nailing the DX.

It is a pleasure to meet such a

bunch, because you can talk
about all the aspects of ham
radio and share your exper-
iences. Among others, my hosts
included Bob K2US, who is ex-
perimenting with antennas and
decided to try one of the
VE38MV razor beams; Gary
K2UU, who enjoys working on
antennas, working DX and con-
tests, and is involved with the
big multi*multi station of K2GL
(better known as N2AA); Ovie

N2AJ, who Is more technically-
oriented; and Jack W2LZX,
president of the LIDX Club and
an old DX tiger. You can see that
they can get excellent stations
going by using their skills and
experience when there is a lack
of funds. In DXing, you can
make up for the deficiencies in
finances either by spending a lit-
tle more time or by building and
modifying equipment. A number
of remarkable installations are
around which rival some com-
mercial radio stations. People
such as K2GLh W2HCW, W2PV,
KQRF, AB0lT and N5AU, to name
a few, have stations which show
a lot of work, love, and persis-
tence, it is a sheer pleasure to
talk to people like them. Be-
cause they love their hobby,
these "well-cooked" hams work
at it and enjoy it*

CHINA BREAKTHROUGH

The Boeing Employees Ama-
teur Radio Society (BEARS)
delegation arrived in the
Peoples Republic of China on
September 4T 1981 P and depart*
ed on September 12. We were
the first official international
amateur radio delegation to visit
China in more than 32 years. Our
host was the Chinese Institute
of Electronics, a branch of the
4th Ministry of Machine Build-
ing. The delegation members
consisted of Pat West W7EA,
Henry Oman K7HO, Bob Hudson
K7LAY. and Bill Showers
KC7CF.

Sponsors included Boeing
and the Western Washington
OX Club. Contributors to our ex-
pedition included the R.L Drake
Company, which supplied two
complete TR7 stations, Telex/Hy-
Gain. which supplied two dipole
antennas, and the ARRL, which
supplied a copy of the film
MWide World of Amateur Radio"
and a few books.

Our delegation prepared and
presented a four-hour slide pre-
sentation covering amateur
radio in the USA, This presenta-
tion was made in each of the
cities that we visited.

Although we did not expect to

operate, we were permitted to
set up a demonstration station
in Beijing and communicate
with our home city, Seattle. This
historic event occurred at about
ten pmu Beijing lime, on Sep-
tember 6th. Our contact in Seat
tie, representing our two clubs,
was W7PHO and our callsign in
Beijing, also representing our
two clubs, was K7LAY. We are
very sorry that we could not talk
to more stations.

The Chinese advised us thai
our transmissions were the first
authorized amateur radio com-
munication demonstration in
more than 32 years— truly an
historic event. This contact
signifies the increasing friend-
ship between our two nations.

A second historic event oc-
curred on September 9th, With
the assistance of our delegation
in Shanghai, the Chinese in Bei-
jing installed a Drake TR7 sta-
tion and the Chinese in Shang-
hai also installed a Drake TR7
station. Successful communica-
tions were established between
Beijing and Shanghai by Chi-
nese operators, again for the
first time in more than 32 years.

The operator In Beijing was
Chen Ren-Mo, and the operator
in Shanghai was Hsu Y.C. Mr.

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73 Magazine • December, 1981 175

Hsu was licensed many years
ago as XU8CH and C1CH.

Although propagation was
not good between the cities!
communications were estab-
lished about 10:45 pm on
September 9th. The station in
Beijing used the callsign CIE
and the one in Shanghai used
K7LAY. Both stations were
heard In many countries with

strong signals. The Chinese
asked us to tell the world that
their top government leaders are
solidly behind amateur radio,
and that before too longT China
expects to establish many
friends throughout the world
through the medium of ama-
teur radio.

Our delegation was over-
whelmed by the reception we re-

ceived In China and very hon-
ored to be the first official
amateur radio delegation to Chi-
na and to demonstrate amateur
radio. In China, we met many
old-timers and our meetings
with them were precious events
in all our lives.

We are very appreciative of
our host in China, The China In-
stitute of Electronics, and also

the China National Radio Sport
Commission and the Shanghai
Institute of Electronics.

Editor's Note: This report is
based on a press release from
the US delegation, filed on Sep-
tember 12 in Hong Kong. 73
hopes to be able to report more
details on the China break-
through in the months to come.

CONTESTS

Robert Baker W82GFE
75 Windsor Dr.
Atco NJ 08004

I've lost track of the number
of times we've asked everyone
to send in their information as
early as possible, but I thought
V6 better do It one more time. At

least three or four contest an-
nouncements were received too
late for the last issue, Some
came as late as four weeks past
deadline. Just to show you what

kind of lead time is involved, the
material for this Issue had to be
in my hands no later than Sep-
tember 20th. To be safe, it
should be sent directly to my
home address and not through
the magazine as that only tends
to slow things up. It might be
several weeks before mail rs for-
warded to me from Peterbor-
ough, If material is coming from
overseas, send it as early as
possible and use air mail to
avoid delays, In all cases, try to
get the information in as early
as possible.

In the results department, . ,
W1CCN finished third while
K2SX finished fifth on CW dur-
ing the 1981 RSGB 7-MHz Con-
test. They were the only USA
amateurs listed in the official re-

MARSHALL CLOUSER MADISON COUNTY
107 S. MADISON MADISONVILLE, TEXAS 77864

QSL OF THE MONTH

Bright, eye-catching color and humorous graphics made K5ZOO's card this month's winner.

If you would like to enter the contest, put your QSL in an envelope and mail it along with your choice of
a book from 73's Radio Bookshop to 73 Magazine* PEne Street, Peterborough NH 03458. Attention; QSL
of the Month. Entries which do not use an envelope{the Postal Service does occasionally damage cards}
and do not specify book choice will not be considered. Each month we consider a new set of entries, so
you may want to resubmit your card in another month.

suits, Maybe we can do a little
better in '82.

CONNECTICUT QSO PARTY

Starts: 2000 GMT December 5

Ends: 0200 GMT December 7

Rest period: 0500 to 1200 GMT

December 6

Sponsored by the Candle-
wood Amateur Radio Associa-
tion (CARA). Phone and CW are
considered to be the same con-
test. Stations may be worked
once on each band and each
mode.

EXCHANGE:

Send QSO number, RSfT), and
ARRL section or Connecticut
county.

SCORING:

Out-of-state stations multiply
total QSOs by the number of
Connecticut counties worked (8
maximum). Connecticut sta-
tions multiply total QSOs by the
sum of ARRL stations and prov-
inces. Additional DX contacts
count for QSO points, but only
one DX multiplier overall is al-
lowed. W1QI, the club station,
will be operating CW on the odd
hours and SSB on the even
hours and counts as 5 points on
each band and mode. Novice
contacts count as 2 points each
and OSCAR contacts count 3
points each,

FREQUENCIES:

CW— 40 kHz up from the bot-
tom of each band; SSB— 3927,
7250, 14295, 21370, 28540; Nov-
ice—3725, 7125, 21125, 28125.

ENTRIES A AWARDS:

A Worked All Connecticut
Counties certificate will be
awarded to each station work-
ing all Connecticut counties.
Other awards given as usual,
minimum of 5 QSO points! Logs
must show category, date/time
(GMT), stations, numbers,

176 73 Magazine * December, 1981

Ih« tattlcbuU

yankee clipper
contest club

NEWSLETTER CONTEST WINNER

This month, we salute the Yankee Clipper Contest Club
(YCCC) and its publication, The Scuttlebutt, Despite the
limitations of a small budget editor K1GQ produces a good-
looking, information-packed, 10-page newsletter each month.
What's the secret of this low-cost success?

For starters, the editor leaves no stone unturned in his
quest for cluh members with connections necessary to get
The Scuttlebutt printed at the lowest possible cost, . , some*
times for free! Occasionally, he cajoles a local firm involved in
the ham business to pick up the tab, in exchange for a page of
advertising.

Typesetting for The Scuttlebutt Is a volunteer effort, con-
tributed by club members with access to the required equip*
ment. Mailing labels are similarly handled by a member who
keeps the YCCC membership list on the computer in his of*
fice.

The editorial content of the newsletter is a cooperative ef-
fort, too. with many club members helping out. The editor
doesn't try to write the whole thing.

The lesson to be drawn from The Scuttlebutt is that there
are numerous untapped resources both within your club and
within your community, Editors on a budget (aren't we all?)
must seek out these hidden assets. Quality on a shoe-
string—It can be done!

Proud of your club's newsletter? Send it to: Newsletter Con-
test, 73 Magazine, Peterborough NH 03458.— WBBBTH.

bands, QSO points, and claimed
scores. Enclose a large SASE
for results, Logs must be post-
marked by January 2nd and sent
to: Steve Grouse KA1ECL, 3
Queens Court, Danbury CT
06610.

G QRP-CLUB WINTER SPORTS

Daily from 0900 to 2300 GMT
December 26 to December 31

All amateur radio operators
interested in QRP are invited to
take part in the club's activity.
No special exchange informa-
tion was mentioned in the infor-
mation provided by the club. The
operating schedule for each day
is as follows:

• 3560 kHz— 1200-1300, 1400-
1500, 2100-2200 GMT.

• 7030 kHz— 1100-1200, 1300-
1400, 2000-2100 GMT.

• 14060 kHz— 0900-1000, 1730-
2000, 2200*2300 GMT.

• 21060/28060 kHz— 1000-1100,
1500*1730 GMT.

Reports on the Winter Sports
Activity should be sent to Gus
Taylor G8PG, 37 Pickerill Road,
Greasby, WirraL Merseyside L49
3ND, England.

CANADA CONTEST

Starts: 0000 GMT December 27
Ends: 2359 GMT December 27

Sponsored by the Canadian
Amateur Radio Federation
(CARF), the contest is open to
all amateurs. Use all bands from
160 to 2 meters, CW and phone
combined, and everybody works
everybody. Classes of entry in-
clude: single operator, all band;
single operator, single band;
and multi-operator, single trans-
mitter, all band. All contacts
with amateur stations are valid.
The same station may be
worked twice on each band,
once on CW and once on phone-
No crossmode contacts and no
CW contacts in the phone bands
allowed.

EXCHANGE:

Signal report and consecutive
serial number starting with 001.
VE1 stations will also send their
province (NS, NBt PEl).

SCORING:

Ten points for each contact
with Canada, 1 point for each

CALENDAR

Dec 5-7
Dec 26-31
Dec 27
Jan 1
Jan 2-4
Jan 9*10
Jan 16-17
Jan 16-17
Jan 30-Feb 7
Feb 6-7
Feb 20-21
Feb 27-28
Mar 6-7
Jun 12*13
Jun 26-27
Jul 10-11
Aug 7-6
Sep 11 12

Connecticut QSO Party

G QRP Club Winter Sports

CARF Canada Contest

ARRL Straight Key Night

Zero District QSO Party

73s 40 and 80 Meier Phone Contest

73' s International 160-Meter Phone Contest

International SSTV Contest

ARRL Novice Roundup

RSGB 7-MHz Contest— Phone

ARRL DX Contest— CW

RSGB 7 MHz Contest— CW

ARRL DX Contest— Phone

ARRL VHP QSO Party

ARRL Field Day

IARU Radiosport

ARRL UHF Contest

ARRL VHF QSO Party

14
14
14
14

7
7

3.5
3.5
3.5
3.5

VE3DU

VE4YF

KL7JHD

KA2EPS

EA7AKQ

VE7BS
JL1CGL

VE2JV

KA8FAL

WAODEL

VE3LXL

8,100
3,720
3,240
3,152
512

8,932
64

8,000
2,317

1,872
212

360

107

78
51
35
15

540
372

540
394
128

636

800
331
234
106

RESULTS

RESULTS OF THE 1980 CANADA CONTEST

Class

Call

Score

QSOs

Points

Mult.

VE5DX

773,740

1194

7034

110 I

VE3GCO

299,390

549

3290

VE7SK

263,283

360

2831

VE2DZE

203.662

351

2578

VE7CMK

172,317

436

2427

VE7WJ

600,516

602

4716

126

VE7CNY

341,972

691

3638

VE6ANC

251,251

397

3263

DA2CF

31,220

185

1561

JR3SOZ

VE6CKW

39,160

294

1780

VE7CXC

35,000

463

1750

VE4VV

26,576

351

1208

WA5QBO

23,380

183

1670

VE6BFN

20,010

280

1334

DF1EI

1,000

200

JA60KB

654

109

VE3KOY

705

141

JHflCXS

10
6
8

7
8
2

73 Magazine * December. 1981 177

contact with others. Ten bonus
points for each contact with any
CARF official station using the
suffix TCA or VGA. Multipliers
are the number of Canadian
provinces/territories worked on
each band and mode (12 prov-
inces/territories x 8 bands x 2
modes for a maximum of 192
possible multipliers).

FREQUENCIES (as applicable):

Phone— 1810, 3770; 3900,
7070, 7230, 14150f 14300, 21200,
21400T 28500, 50100, 146520;
CW— 1810, 3525, 7025, 14025,
21025, 28025, 50100, 144100.
Suggest phone on the even
hours (GMT), CW on the odd
hours (GMT).

AWARDS:

The CARF Canada Contest

Trophy will be awarded to the
highest scoring single operator

entry. Certificates will be award-
ed to the highest score in each
entry class in each province/ter-
ritory, USA call area, and DX
country, and to the highest
score from those who have only
their amateur certificates.

ENTRIES:

A valid entry must contain log
sheets, dupe sheets, and a sum-
mary sheet showing a chart of
multipliers per band/mode and
score calculation. Send your en-
try with comments to: Canadian
Amateur Radio Federation, PO
Box 2172, Station D, Ottawa, On-
tario, Canada K1P 5W4, post-
marked within one month of the
end of the contest. Results will
be published in TCAt the Cana-
dian amateur magazine. Norv
members may include an SASE
for a copy of the results.

ZERO DISTRICT QSO PARTY

Starts: 2000 GMT January 2
Ends: 0200 GMT January 4

Organized by the Mississippi
Valley Radio Club, Stations out-
side of Zero District will work
Zero stations only. Zeros may
work any station. The same sta-
tion may be worked once on
each band and each mode. How*
ever, stations In the special
mobile class may be worked
each time they change counties.

EXCHANGE:

RS(T) and ARRL section. Zero
District stations must also send
county,

FREQUENCIES:

3560, 3900, 3725, 7060, 7270,
7125, 14060, 14300, 21125.
21060, 21370, 28125, 26060,

28570,

SCORING:

Add the number of Zero
District ARRL sections worked
plus the number of Zero District
counties, then multiply by the
number of contacts. Zeros score
by adding ARRL sections, Zero
District counties, and DXCC
countries worked and then mul-
tiplying by total contacts.

ENTRIES & AWARDS:

Certificates will be Issued to
all entrants who submit a log
and SASE. Endorsements will
be given for high score in each
ARRL section, DX country, Nov-
ice/Technician class, and Spe-
cial Mobile class. Mail logs by
February 15th to VWSl, 3518 W.
Columbia, Davenport IA 52804.
Include an SASE for log forms or
results.

MM HELP

I need an M transformer for a
Hammarlund HQ-170 receiver. It
Is designated T1 on the sche-
matic, and is Hammarlund part
#K264Q2-1. It is a combination
45&*kHz and 303^kHz trans-
former that needs an exact re-
placement. I will gladly pay a
reasonable price for a suitable
transformer.

David Hansen KB6F!
7484 Tustin Road
Salinas CA 93907

Information and/or schemat-
ics wanted for conversion of
Drake L-75 linear to 10 meters.
Will defray all costs involved.

E.V. Schoon maker N5CGE

792-A Fa in/lew Avenue

Annapolis MD 21403

Wanted: work in KnoxviHe or
Chattanooga, Tennessee, area*
First ctass radiotelephone and
Extra class license,

H,F. Schnur

115 Intercept Ave,

North Charleston SC 20405

I am in need of the following
items: (1) manual/schematic for
HalNcrafters HT32B; (2) a main
power transformer for the HT32B
(please state price), and (3) a
manual or schematic for the
Globe Electronics Hi-Bander
VHF-62 transmitter.

i will pay for postage and
copying costs,

Richard E. Duell W9LSD
4415 N, Florence Dr.

McHenry IL 60050

I am trying to locate an
instruction manual and sche-
matic diagram for a Model
Memo 512 keyer made by K* E.
Electronics.

I will pay for copy or copy and
return original,

William Hartley K2RDS

1201 Paul Ave.

Schenectady NY 12306

I am in need of a Centralab
switch, #PA076. I'll be glad to
pay for it.

Don Ramey WA4FQC

Box 217

Meridianville AL 35759

I need an antenna relay for the
Hammarlund HX-50 transmitter
Also, information about any
source for Hammarlund parts
will be appreciated,

Arnold Irvine KA9ELN

5 Orumcliffe Drive

Warren PA 16365

Please; I need the manual tor
a Peirson KE-93 receiver and an
Etmac AF-67 transmitter. I will
copy and return and pay mailing
costs.

Robert F. Voelker WA2PCL

101*23 Lefferts Blvd.

Richmond Hill NY 11419

I am looking foraUAILOQSL
card from before 1968 for my

astronaut autograph collection.
(UA1LO was Yuri Gagarin, the
first man in space.) Thank you.

Mike Smlthwlck AA6XI

25215 La Lome Drive

Us Altos Hills CA 94022

I am looking for a book or in-
formation on a 2-meter rig, the
Setec-Elect FRT-20& It's an
8-channel rig and I have no idea
who made it,

F. WhlttierWBICXX

RFD #1, BOX 390

Madison ME 04950

STATEMENT OF OWNERSHIP, MANAGEMENT AND CIRCULATION (Required by 39 US.C 3685). 1. Title of publication, 73Magazine.2. Date of tiling. Oct 1. 1961-3, Fre-
quency of issue. Monthly. A. No. of Issues published annually. 12. B. Annual subscription price, $25.00. 4. Location of known office of publication (Street, City, County,
State and ZIP Code) (Not printers), 80 Pine Street. Peterborough, Hlllsboro County, N.H. 03456. 5. LocaHon of the headquarters or general business offices of the
publishers (Noi printers), 80 Pine Street, Peterborough, Hlllsboro County, N.H. 03458. 6. Names and complete addresses of publisher, editor and managing editor.
Publisher (Name and Addressi, Wayne Green, Peterborough. N.H. 03458. Editor (Name and Address), Wayne Green, Peterborough, N.H, 03450. Managing Editor (Name and
Address}, Jack Burnett, 12-C Gran He St, Peterborough,. N.H. 0Q4$fi. 7. Owner (If owned by a corporation, iis name and address must be stated and also Immediately
thereunder the names and addresses of stockholders owning or holding i percent of more of total amount of stock it not owned by a corporation, the names and ad-
dresses of the individual owners must be given If owned by a partnership or other unincorporated firm, its name and address, as well as that of each individual must be
given If the publication is published by a nonprofit organization, its name and address must be stated.) Name, 73. Inc., Peterborough, N.H. 03458- Wayne Green, Peter-
borough, N.H. 03456. 8. Known bondholders, mortgagees and other security holders owning or holding 1 percent or more of tola) amount ot bonds, mortgages or other
securities (If there are none, so state) Name, none, 9. For completion by nonprofit organizations authorized to mall at special rates (Section 132.122, PSM) The purpose,
function and nonprofit status of this organization and the exempt status for Federal Income tax purposes (Check one) Not applicable, 10. Extent and nature of circulation.
(X) Average No, copies each issue during preceding 12 months. (Y) Actual No. copies of single issue published nearest to filing date A, Totat No, of copies printed (Net
Press RunHXt 70 .810 (Y) 61K253 B. Paid circulation 1, Sales through dealers and earners, street vendors and counters sales. {>Q1 1,964 (Y) 1 5,186. Z Mail subscriptions |X)
52,747 (Y| 51,871, C. Total paid circulation (Sum of 10St and 10B2) |X)64f7l1 (Y) 67,057 D. Free distribution by mail, carrier or other means, samples, complimentary, and
other free copies (X) 359 i Y) 400. E Total distribution (Sum of C and D| (X) 65,070 00 67,517. F. Copies not distributed 1 . Office use, left over, unaccounted, spoiled after
printing <X} 5.024 (Y) 1,020. 2. Returns from news agents {Xj 716 (Y)71§. G, Toial (Sum of E> Fi and 2— should equal net press run shown In A} (X) 70,6 10 CO 69.253, 11. I cer
tity that the statements made by me above are correct and complete. Signature and title of editor, publisher, business manager, or owner. Debra Boudrieau, Business
Manager.

178 73 Magazine * December. 1981

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Write or phone for free brochure
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Helium Trap Antenna Systems,

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Tel: 305/561 -1400

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COPY RTTY, ASCII

and Morse
from the palm
of your hand.

i
i
i
i
i
i
i
i
i
i
i
i
i
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you waited to get into
code reading until you found
out what this latest fad was
about? You can stop waiting,
because it's no longer a fad.

Amateurs everywhere
are tossing the gigantic
clanking monsters of yester*
year that once performed
the job of reading
radioteietype. They are trad-
ing them in for state-of-the-
art code-reading devices
that are incredibly small,
noiseless if desired and in-
finitely more versatile than
their antique predecessors.

Kantronics, the leader in
code^reading development,
has just introduced the latest
and most-advanced break-
through in the copying of
Morse code, radioteletype
and ASCII computer langu-
age.

The Kantronics Mini-
Reader reads air three types
of code, displays code speed.
keeps a 24-hour clock, acts as
a radtotetetype demodulator
and reads all of its decoded
information out on a travel-
ing display of 10 easy-to-read
characters, it is so compact
that it fits in a hand-held,
calculator-size enclosure.

At 5314,95, the Mini-Read
er outperforms anything
within another S400 of its
price range.

Call or visit your Authoriz-
ed Kantronics Dealer now to
find out what the latest in
technology has done to
code-reading.

Kantronics

(913)842-7745

1202 E. 23rd Street
Lawrence, Kansas 66044

See List ot Advertisers on page T62

73 Magazine * December, 1981 179

W2NSD/1

NEVER SAY DIE

ed/tor/a/ by Wayne Green

from page 8

development in ihe past I've found
older amateurs are generally rests
tani to new ideas and really hate to
have to read about them. But after a
white, though I lose readers in the
process, interest does come and fi-
nally the other amateur publications
reluctantly join me In publishing in-
formation on the new technology. It
worked this way with sideband, with
transistors, with ICs, and with FM. so
we'll probably see the same pattern.
There are, obviously, far more ben-
efits than just a wonderful emergen
cy communications system which
can come from this step ahead. If we
are successful in establishing a sys-
tem for getting the growth of amateur
radio that we really need . . and that
will be on the order of 33% per year,
not 3% . . . we are going to have to de-
velop much more efficient communi-
cations modes. Anyone listening to
the high end of twenty-meter phone
any evening has to realize that new
techniques are already needed..,
seriously needed, With high-speed
ASCII communications, we could
easily accommodate a thousand sta-
tions where we now have one and we
could have room for the two million
hams we should have right now and
the three million we want to have
by 1990

This is a reasonable answer, too,
for using the narrow bands available
on our ham satellites

If we develop the encoding tech-
niques I discussed at the last NIAC
meeting, our information exchange
would immediately go from 6500
words per minute to about 26.000? All
this would be done via a simple inte-
grated circuit chip which would en-
code the 32,000 most used words be-
fore sending them... and then de-
code them upon reception. Further,
the output could be in any language,
allowing amateurs anywhere In the
world to communicate with each
other, regardless of their spoken Ian
guage. Again, nothing has to be in*
vented. We just have to write the
computer programs to accomplish
this and perfect our equipment, tech-
niques, and protocols.

A word ol warning, if I may. If we
are going to turn around the disaster
which has brought us to technologi-
cal defeat at the hands of the Japa-
nese, we are going to have to do more
than nod our heads and adjourn until
the next scheduled NIAC meeting. If
we are going to be abte to provide
anything of any great value In the
way of emergency communications
...if we are going to develop the
systems which I have outlined. . we
need to realty activate NIAC. ustng
its com municat tons with the FCC to
bring this situation to the attention of
the White House.

By ihe way. speaking of satellite

communications: If we were to dedi-
cate one channel of a satellite to a
calling frequency, it would, using
9600 baud, be abte to handle 216T000
different calls per hour lor us, with
each call consisting of the callstgn
of the station called and the calling
station.

In terms of emergencies, tests
have already been made which show
that we can use relatively low-pow-
ered emergency transmitters, and by
measuring the signals received
through a ham satellite, it is possible
to determine the location of the
transmitter to a surprising degree.
Digitizing and automating this ser-
vice would provide an emergency lo-
cating system which would be sim-
ple and inexpensive and work any-
where in the world. . .whether it be
used to locate a raft floating in Ihe
Pacific Ocean or someone tost in the
jungles of Sumatra. It is the digitizing
and automation which bring this
emergency service to anyone who
needs it.

So here we are. on the brink of yel
another revolution in communica*
tions. Will this be brought about by
amateurs or must we wait for com-
mercial and military systems to do
what we could develop? A good part
of the answer tor that lies, in my esti-
mation, in whether we as a group will
be able to start some action with the
FCC and with our government which
will result In a sudden and spectacu-
lar growth of amateur radio.

Most of you who are here today
have made long trips and have to
leave your businesses. You've car-
ried the expense ol this yourselves.
NowT while it is obviously an honor to
be a member of a government advi-
sory committee, it is an empty hon-
or. . .worthy of no more than a line in
a Who's Wno biography which will be
read by few . . . unless we are able to
actually accomplish something.

As the only official interface be-
tween the amateur radio community
and the FCC, we have a responsibil-
ity to our fellow amateurs to speak up
for them As the group which I feel
must shoulder most of the responsi-
bility for the loss of our country's
technological leadership of the
world, we should speak up for radio
amateurs and do our best to see that
the FGC provides the incentive for
amateur radio to grow again. We
have to remember that even if we are
able to spark a combination of events
which gels amateur radio into a
growth pattern which is three times
our past highest growth, it will still
take us at least ten years to catch up
with the catastrophic losses we have
suffered over the last 18 years.

I believe that the FCC commission-
ers will be interested in this situation
and be responsive to our leadership,
if we can provide it . and that, at the
root of it, is the real purpose of this
committee.

1 suggest that we need more than
an occasional meeting and minutes.
more even than a report and recom-
mendation, I suggest that we appoint
an action committee to work with the
FCC to develop both White House in-
terest and the rules changes which
might contribute to the goals we
have in mind.

Since my business is growing at
an ever-increasing rate, now number-
ing eight monthly publications plus a
software publishing division, and
with five more monthly publications
in prospect, plus the opening of at
least three more major divisions of
the company, my own time is severe-
ly limited, I would be happy to serve
as a member ol an action committee,
but I would not be able to provide the
leadership and time that a chairman
should devote to such a committee.
Between my ham interests and my
computer interests, I spend a good
deal of time traveling. Last month I
managed to get on the air for a short
while as W2NSD/3D6, W2NSD/ZS,
and as 7PBCA, ail while setting up
South American and South African
editions of one of my computer
magazines,

I did manage, just before leaving
for Africa. . .and just after a trip to
California setting up three prospec-
tive new publications. . .to visit with
FCC Chairman Fowler and discuss
briefly some of the ideas which I have
just covered. I found him most enthu-
siastic and cooperative, so I be-
lieve that if NIAC will appoint a sub-
committee, an action subcommittee,
we will be able to more than be re-
warded for our time and money spent
as members of NIAC.

The job of such a committee and of
the FCC is not an easy one. The polls
of amateurs have shown clearly the
strong feelings for maintaining the
Morse-code requirement. Yet when
one talks to people interested in be-
coming radio amateurs, this is al-
ways the major obstacle, Indeed, be-
tween the wealth of destructive code
teaching systems now available and
the ability of even the best of us to
put off an unpleasant job if at all pos-
sible, it is a wonder that we have even
maintained our present membership.

As I have mentioned in the past be-
fore this committee, r think I have
heard every argument, both pro and
con, on the subject of the code re^
quireinent for our amateur licenses.
It is my belief, after giving considera-
tion to ail of these arguments, that
we should have a technical license
exam, not one measuring a skill. I see
not even the remotest connection be-
tween a skill of Copying code and
being a good amateur. Despite the
attempts of the plain language pro-
posals, I tend to define a good ama-
teur as one who is pursuing any or all
of the four major reasons set out in
our rules. 97.1, for the existence of
the service.

It is increasingly difficult to remain
blind to the success of the Japanese
amateur radio system and I think we
should put aside our "not invented
here ' emotions and take advantage
of an innovation which has obviously
worked. Just as American industry is
taking the Japanese Type-Z manage-
ment system seriously and finding
that this brings about remarkable in-
creases in productivity for their firms
...and a sudden drop in people
changing jobs ..we should look
pragmatically at the Japanese no-

code license system as a possible
solution to our problems.

There will, I am sure, be resistance
from older amateurs, I would be sur-
prised if one or more of the ham mag-
azines did not rush to take political
advantage of the situation. But if we
insist on trying to follow the system
of doing only what the majority
wants, we will have s technology as
innovative as our television pro-
grams. This is a time for leaders. . .
leaders with confidence. We have a
good example of this in our Adminis-
tration, which has not been afraid to
push against the tide toward goals It
sees as important in the long run. I
am hoping that NIAC will form an ac-
tion committee which can do like-
wise for the benefit of amateur radio
and our country.

Despite my plea not to be
made chairman of a committee
to tackle the problem, the new
chairman of NIAC, Charlie Dunn
K7RMG, immediately estab-
lished an Action Committee and
made me chairman. I was seri-
ous about already having
enough to do and was not pull-
ing the old briarpatch tears.
Well, okay, I'm chairman of a
committee, and I'll do the best
I can to get it organized and
into action.

The goal of the Action Com*
mittee is to work with the FCC to
establish a growth of amateur
radio such as we have never
seen before. I feel, as I said in
my report, that we should aim at
no less than a 33% growth per
year and keep that up for a least
ten years.

Another task of the commit-
tee is to work with the FCC to
set up some system whereby
amateurs can experiment and
develop new modes of commu-
nications such as digital high*
speed interactive networks as
cited in my report.

Obviously, we have our hands
full, so it Is going to take a
lot of work and cooperation with
this committee. . .which con-
sists of Oorhoffer of CO, Imlay
of QSTT Curtis (who publishes
books in the computer field),
Harold Todd W7ZXM from Seat-
tie, and me as chairman.

\t you have spent any time
mixing with would-be hams, you
know as well as i that our Morse-
code requirement is probably
the major single obstacle which
has been keeping down our
growth, YesT I know that most
old-time amateurs are fiercely
adamant about keeping the
code test. But as I mentioned in
my report, it has been years
since I have heard a new argu-
ment on the subject and the bal-
ance, as far as I can see, is to-

180 73 Magaztne ■ December, 1961

wards making this a technical
hobby instead of a skill hobby.

Some of the wheezes which
come to mind are as folio ws:

1. Code is a ham heritage. So
is QRM, but that's no reason
to keep it. I am convinced that
we will have more CW opera*
tors than ever if we make It
a fun part of hamming instead of
obligatory. Besides, with more
and more operators using
Morse keyboards, what do you
mean by heritage? Those key-
boards and Morse code readers
are selling like crazy. . Jf that
tells you anything,

2. Without the code test we' ft
be swamped with lousy opera-
tors. Oh my goodness, since
when did learning the code
make anyone a good operator?
If you want to hear really good
operating, not the jamming and
pileups we ina^ige in here, listen
to the Japanese operators. They
were taught how to operate by
their clubs but had no code test.

3. in emergencies, code can
get through when phone can%
so everyone should know the
code. Weil, that may have been
true 50 years ago, but today
most of your emergency traffic
is on phone.., and sideband
gets through as well as CW
almost anytime. In the future,
we will be running most emer-
gency traffic over high-speed
digital networks, not on code or
phone, anyway.

4* CW rigs cost tess than
phone equipment, so by empha-
sizing code we are enabling
even the poor amateur to par-
ticipate. In the pre-war years we
could buy this baggage. When
Heath brought out the HW figs,
that argument went out the win-
dow. , .where it still lies, . .and
that was about 20 years ago.
Let's try to get out of the past.

5. With the current exams
made stupid fy simpie by cheat
books such as the ARRL Q & A
Manual and the Bash books, we
have to have SOMETHING to
keep everyone out, I partially
agree. . . but let's make it some*
thing better than the Morse*
code test. Perhaps we could
change to a licensing system
whereby new amateurs would
have to qualify before a club
board, showing that they know
the rules and are able to operate
a ham station. We might make
the technical exam less vulner-
able to circumvention by
League and Bash Q & A books,

6. // we don't keep the code in
the ham test, code witl just die

out. As I said, I think that once it
is made fun instead of punish-
ment, we will find a new enthu-
siasm for the skill. Our clubs
and publications can intensify
this with contests, certificates,
and articles on the subject.

7. Just because the Japanese
have had such incredible suc-
cess merely by removing the
code requirement is no reason
why we have to imitate them.
Well, 1 believe in learning. When
someone does something new
and it is a success and what I'm
doing is an obvious failure, it is
time to re-evaluate and not let
Not invented Here stop me,

8. / had to go through all that
misery, so why should I want
anyone to have it easier than t
did? Golly, I don't have any real
answer to that bit of garbage.

9. Suppose you are stuck in a
iife-and-death situation where
all you have is a CW transmitter
for communications? Having
been in just such a situation,
and having used CW to save 85
lives, my answer is that the like-
lihood of such a situation occur-
ring is so remote that I really
wonder if it is worth sacrificing
the technology of America on
such a remote circumstance.

Yes, I know that there will be
crowds of old-timers at Dayton
looking for me with ropes, tar,
and feathers. Well, I've leveled
with you down through the
years, never taking the easy way
out. In this case, I think It Is
time. . .way past time, actually
, , Aq get serious about revamp-
ing our ham exams and making
our hobby a technical one rather
than one limited mostly by an
easily learned skill.

Think of it like this. Sure, you
and t know that it is not difficult
to learn the code. Piece of cake,
really. But you also have to ad-
mit that when you talk with non-
hams, you probably make a big
deal of it. If you put yourself In
the shoes of someone consider-
ing being a ham, you will see, as
they do, that the Morse code is a
terrifying new language, . .one
which they are not at all sure
they can master. This fear Is in
itself enough to turn tens of
thousands away from amateur
radio each year.

Then, when someone decides
that he or she is going to try any-
way, the fear is enough to put off
practice. Remember that no-
where in our magazines or in
talking with amateurs is any ref-
erence made to code being fun.
It is the major hurdle for new-

comers and we make a big deal
of it as such. So our talking gen-
erates terror in the hearts of
newcomers and makes practice
all the more difficult . . , even im-
possible. They know they are go-
ing to fall, , .and they find this
self-fulfilling,

I've talked with thousands of
people who wanted to be hams,
but who were unable to sur-
mount the code requirement.
Most of them seriously tried but
were conned into using a terri-
ble code course and found
themselves failing at it no mat-
ter how hard they tried. Indeed,
many of the code courses are ri-
diculous. . .including the best-
selling one of all. This single
code course probably has lost
us more hams that we've gained
in the last twenty years.

In speaking out against the
code requirement, perhaps I am
sowing the seeds of my own
losses. The 73 Magazine code
course, while it sells far fewer
than does the ARRL series, has
sold about 25,000 cassettes a
year. Will \ be out of the code
cassette business if we get rid
of that element of the license? I
think not... in fact I'm betting
that I'll be able to sell more than
ever. . .as fun.

The recent OST polls showed
that QST readers overwhelming-
ly are in favor of keeping the
code requirement, so it's Wayne
Green against the world again.
QST has been pushing code for
as long as I've been hamming—
over 40 years. This got them into
trouble in the late 40s when a
large percentage of the ama-
teurs deserted the League to go
with the National Amateur Ra-
dio Council ... a phone-oriented
group which got us expanded
phone frequencies on 75m, the
40m phone band, and more fre-
quencies on 20m . . . over a lot of
dead bodies, NARC, achieving
Its goals, went away.

So, if anyone has any other
arguments which 1 have not enu-
merated, I'll be glad to publish
them, along with my ripostes.
Let's get this out in the open and
fight fair on it . „ . not let prej-
udices left over from 50 years
ago continue to stop our growth.
When I first got into amateur
radio, there was still a lot of
smoldering anger over being
forced off spark. Then I watched
the same thing happen with AM
phone, I believe in being conser-
vative, but there is such a thing
as carrying it too far. If you
disagree with me, I ask you to

fight fair. If you agree with me,
fight with me for the growth and
health of the very best hobby
ever invented,

FCC CASH-FLOW PROBLEMS

With the Reagan administra-
tion shaking every federal agen-
cy to reduce expenses and lay
off people, the FCC... which
has been underfunded for years
. ,.is in particular trouble. In-
deed, if they had not been so
prudent in the past, they would
be far better able to weather the
current storms.

There has been some talk of
getting government agencies to
charge for services so they can
get Into the black, If this talk
persists, we may again see a
charge for ham licenses. Since
amateur radio takes up a minis*
cule amount of the Commis-
sion's time, our charges should
be minimal, as they were the last
try. But I think I have some ideas
which might cut the cost of the
amateur service even further for
the Commission.

A large percentage of the
Commission time and money is
spent on commercial broadcast-
ers, so there is adequate reason
to pass along this cost to them.
After all, they are making a living
out of the FCC work, I'd also like
to see the common-carrier
chaps pick up their end. It's
about time,,. the television
broadcasters using this service
kind of snuck In through the
back door, Indeed, I haven't
seen any legal justification for
them being allowed to use com-
mon-carrier channels for televi-
sion. That service was not de-
signed for that use and, as
far as I know, it was never au-
thorized for that. WelL let's see
that go through the legalities
and be made official . . . with the
common-carrier boys picking up
the full tab.

Perhaps I'm being a bit vin-
dictive because this bunch of
crumbs cost 73 tens of thou-
sands of dollars in legal fees
to fight their suit against us.
A suit found without merit,
which I feel was brought merely
as an intimidation to try to
prevent 73 from publishing
2300-GHz articles. \ suspect that
more is accomplished in our
country via the threat of court
cases than through the cases
themselves. I know that few
firms are large enough to absorb
the costs the CCAT people put
us through, and most would
have shut up and blown away. I

73 Magazine * December. 1981 181

happen to think that freedom of
the press for amateurs to learn
about these things is worthy of
such an investment, so we put
up the money needed to fight
these stinkers.

Getting back to the FCC prob-
lems. During the Carter adminis-
tration, the FCC commissioners
were so upset over amateur ra-
dio as a result of the hearing
over linear amplifiers that they
virtually eliminated the division.
Now what's left of the amateur
division has to face across-the-
board budget cuts. For those
readers who are forgetful or in-
attentive, let me remind you that
this alienation of the Commis-
sion came about entirely need-
lessly. It was the testimony of
one amateur which did it...
and he was representing a well-
known group, He stood up there
and insulted the new commis-
sioners, putting us all in the dog-
house for four years.

We have a new chairman of
the Commission and several
new commissioners, so we have
a chance for a fresh start.

There are three ways in which
amateur radio is costing the
FCC money these days. One is
the cost of giving license exams
and issuing licenses. A sec
ond has to do with monitor
ing our bands. A third is the
cosl of handling our requested
rule changes.

On the first itemt I think we
could set up a system which
would cut their expenses enor-
mously. I've written about this
before, but not recently, What
I would like to see is a sys-
tem whereby qualifying radio
clubs would be permitted to
give license exams. In order
to get around hokey pokey. I
would suggest that there would
have to be three licensed am-
ateurs present during any test
administration.

This could be almost com-
pletely computerized as far as
the Commission is concerned,
with machine-readable cards
being sent in by clubs for the
issuance of the licenses. This
would enable field offices to
cut back substantially on per
sonnel no longer needed to give
and monitor these tests on a
regular basis.

This would enable almost ev-
ery hamfest to have a licensing
session, run by a local quali-
fied ham club. It would further
cut the cost for people want-
ing ham tickets since they no
longer would have to make the

182 73 Magazine ■ December,

long trip (for many) to a city hav-
ing an exam center and lose a
day or two of pay in the process.
Most exams could be given at
night or on weekends, at the
convenience of the examinees
and the club.

By automating the process.
the FCC wouldn't even have to
have data entry people at Get-
tysburg to enter the names and
addresses of the licensees. This
would be a further savings for
them. And this move ahead to-
ward automation would set the
stage for almost instant licens-
ing. The next step would be
sending in the information over
the telephone via a data ter-
minal (or any microcomputer
with a modem. . which ]ust
about every club has at its
disposal}. The exams could be
given, the data typed in at the
club, sent by modem to Get-
tysburg, and instantly confirmed,
along with the new call of the
licensee. Gettysburg woutd for-
ward the data to Washington,
where the actual license would
be printed out and mailed, much
as is done at present.

If we get into a charge for our
licenses, each club could set up
an account with the FCC which
could be debited each time a
new license was issued by them.
This would give the FCC a nice
float with which to work. If we
had, say, 5,000 clubs participat-
ing, with each depositing $500
(towards licenses at $10 each),
this would give the FCC a two
and a half million dollar float.
That would earn them about
$30,000 a month in interest at
15%. That in itself would pay the
salaries of about 15 people at
the FCC,

With membership to the
League costing $25 per year,
perhaps that is a more reason-
able price for us to pay for our
licenses. Certainly the benefits
of our licenses are more than a
club membership. That would
put a price tag on a five-year
license at $125, which might
seem a bit steep for youngsters.
Of course, we have very few
youngsters coming in at the
present cost (nothing), so it is
difficult to get emotional over
any drop that $125 might entail.

The fee would hit retired peo-
ple hard... even though they
seem able to come up with the
money for the ARRL with no
problem. It might come down to
a choice between a license and
a OST subscription.

So what would be reason-

1981

able for a ham license, con-
sidering where we are with in-
flation these days? If $25 a
year is too much, how much
isn't too much?

One way to look at th is is from
the other side. What is it actual-
ly costing the government to
provide us with the license? Per-
haps this makes more sense
than going by how much it is
worth to us, . .which is a lot in
some cases. . .and not much in
others. If we are able to help the
Commission cut their expenses,
we can rational i2e paying less
for the service we are getting. . ,
and that is the key, to my way of
thinking. I don't mind paying my
share. I don't want to pay the
share for someone too lazy or
cheap to pay, someone who
wants to ride on my coattails.

if we are able to take the
license examination adminis-
tration off their hands, that
will save them money. And, con-
sidering the usual government
efficiency, cutting that expense
at one end should save sev-
eral times the cost by the
time the whole organization
is considered.

Then there is the matter of
monitoring. Here we could cer-
tainly help and would benefit in
several ways as a result. The
benefits would be fantastic.
First, we would stop hearing
from the Commission that ama-
teurs are not permitted to ex-
periment with new modes of
communications Just because
the FCC monitoring stations are
unable to decipher our transmis-
sions. That beauty of a rule ... a
rule, by the way, which was
never written into any of our
regulations, but was just decid-
ed unilaterally for us.. .has
kept amateurs from developing
any significant new modes of
communications for the last
twenty years or so. That has
t^een one of the most destruc-
tive unwritten rules in the
history of amateur radio, as well
as a direct violation of 97.1c of
our written rules.

Secondly, with a thousand
amateurs available for monitor-
ing for every present FCC em-
ployee, we could do a job of
monitoring which would be
almost infinitely better than is
being done at present, I know
there are thousands of ama-
teurs who would Jump at the
chance to participate in such an
operation, Indeed, amateurs
could set it up. establish
the computer communications

which would make it work, de-
velop automatic scanning
equipment to monitor the entire
spectrum, and so on. Between
our retired hams, our handi-
capped hams, and the coopera-
tion of several thousand ham
clubs, we'd have a bail . . .and
do a splendid job.

We also could save the FCC a
bundle. , .passing along only
those reports which were of
importance to the few FCC
monitoring stations still need-
ed. You know as well as 1 that
clubs would love to set up di-
rection-finding systems to track
down mysterious stations. . .to
listen for emergency air or
marine traffic. . .and so on. It
would give us much more to do
which would be both fun and
beneficial to the country.

On the matter of cutting down
on legislative expenses, let me
bring up an idea which I have
written about every now and
then down through the last thir-
ty years. This has to do with
amateurs taking the responsibil-
ity for coming up with proposed
rule changes. . .and working
them out via a symposium simi-
lar to that run by the ITU in Gen-
eva every few years, We could
have as a responsibility for our
ham clubs the generation and
forwarding of proposed rule
changes. Then we would have a
meeting every two years where
club delegates could discuss
and decide what actual changes
we really want,

We could, like the ITU, set
up subcommittees to discuss
and recommend action on each
of the proposed changes. These
committees would pass along
their recommendations to a
meeting of all club delegates
for final voting and action, This
process could save the Com-
mission hundreds of thousands
of dollars presently spent on
trying to cope with proposed
ham rule changes. It also would
get us our rule changes while
they are needed, not years later
when they are a nuisance and
long unneeded.

In these ways, we could get
amateur radio off the back of
the Commission, saving them
most of their present amateur
radio expenses. In return, our
service would be much more
flexible and able to grow and
develop, keeping up with...
and preceding., .technology. I
think we would start seeing in-
ventions and pioneering of new
ideas returning to amateur ra-

dio . . . with benefits to our coun-
try and the world.

It is a shame that rn these
days of digital communications
amateur radio is held back by
the FCC with the technology of
twenty years ago.

CLUB RESPONSIBILITY

Just a few years agot I ran
a poll of ham clubs and found
thai only about 1% were spend-
ing time and effort to run ham
classes to develop new Nov-
ices. Perhaps I got overly abu-
sive about this in my editor-
ials, but the response was good
and we got to a point where over
50% of the ham clubs were run-
ning ham c lasses,

That seems to have dropped
in recent months, . .probably
due to the difficulty of finding
candidates as interest in CB has
diminished. Well CB or no CB,
we need massive numbers of
new hams. You read about that
in more detail in my piece about
NIAC and its recent meeting.

Now, I can see where a small
ham club, with perhaps a half
dozen members, might have dif-
ficulty in developing the re-
sources needed to teach new
hams. But if there are any larger
clubs which are not holding up
their end of this, let's get going
immediately. Get those classes
started, There are plenty of
teaching materials, . .and you
have members who will help
out. . .if you will get moving. I
want to see our next poll show
that over 90% of the ham clubs
are generating new licensees.

What is a reasonable number
of new hams to bring into the
world? Well; since your club
probably represents only about
25% of the available local
amateurs in your area, at best,
you should aim for at Jeast
matching the number of your
present club members each
year. We need an overall 33%
growth per year in amateur li-
censees, if we are able to get
4,000 of our clubs to run classes,
we need to generate 33 new
hams per club this year, . .and
45 per club next year. Obviously
it can be done . . , if your club will

start doing it and see that

every other club in your area is
working just as hard as you are,

FAKE QSL CARDS

The world of the DX Honor
Roll is shaking as a result of the
expose by W6NZX. In what ap-
pears to be a classic case of

shooting the messenger. Bob
has been singled out to be
pilloried, thus making sure that
no one else rocks the boat.

Since there is no known way
to prevent cheating, either on
the side of the Honor Roll ama-
teurs or the DXpeditioners. per-
haps it is time we gave some
consideration to taking the heat
off the whole situation by either
getting rid of the lists in ham
magazines. . .or making it pure-
ly a matter of "claimed1 coun-
tries contacted. I hate to be the
one mentioning this, but the
whole matter is one of no impor-
tance whatever.

By attaching some impor-
tance to the number of coun-
tries contacted, we set up
several undesirable effects.
First, we have seen the develop-
ment of a cult in amateur radio
dedicated at almost any cost to
staying on top of the list. This
has gotten to unbelievable pro-
portions, with the pursuit taking
precedence over families and
even over work.

As the importance has been
magnified in the minds of the
cultists. any stratagem has
become accepted toward the
goal of staying on top of the list.
These chaps are well aware that
many of the cards they have are
fakes in one sense or another.
Indeed, the awards committees
know this too* but have played
along with the cultists (whom
they have generated), accepting
fakes at face value when there
was no question in their minds
about the invalidity of the cards.

I've mentioned recently that I
have a bunch of cards which I
know to be fakes, but which I
could submit for awards, . and
get them. I'm not talking about
cards from almost unknown sta*
tions, but cards from some of
the best-known DXpeditioners,

Now what is a "fake" card?
As minds crazed with getting
ahead of others on The List
churn, more and more fakes ap-
pear. Some are transparent forg-
eries, where the cards have
been turned out in a local print
shop with not even an effort to
copy the original, I used to get
those in abundance when they
were submitted for our Worked
The World award. Fortunately,
being active in working OX, I had
the real cards on hand for com-
parison.

Others are copies of the real
cards. Now how is a person
checking through a stack of
cards going to be able to tell the

difference between the real card
and an exact imitation? Accord-
ing to inside sources, the
awards people have not figured
this one out and so they have
been accepting the cards at
face value.

With QSL managers all over
the place, there is no way for a
QSL printer to know that an
order for 500 cards is from a
chap {or group) about to put
them out as counterfeit cards.
Most people who handle our
QSL orders {and 73 turns out
around a hundred orders a
week) know nothing about ama-
teur radto. They just set the type,
proofread it against the order,
make up the printing plates,
print the cards, package them,
address them, and ship them
out, I'm sure that most of
the QSL printers work pretty
much the same way. It's mass
production,

QSL managers, with thou-
sands of blank cards^ have often
been known to hand out sam-
ples to friends. It isn't difficult to
fill in a card and end up with
something which is exactly like
the real thing. With many cards
coming in envelopes, even the
lack of a postmark or QSL
bureau stamp doesn't mean
much. For the perfectionist,
there are fake bureau stamps*
brief notes from the real DX
operator in answer to some
question to provide the enve*
lope. , .and soon.

It does appear that for many
OXers there is more fun and
work involved in fooling the
awards people than in the chase
of the DX That has become a
subset of the cult.

DXpeditioners who do their
own QSLing have given little
thought to the counterfeit prob-
lem and have often handed out
souvenir cards to anyone ask-
ing. Many of these have been
filled out later and passed
through the awards people for
full credit. I've visited a number
of rare spots and often have
handed my cards out as souve
nirs at hamfests.

Some of the rarer spots from
which I've operated are 3D6.
7P8, 5Z4, 0O5, JY, YA, EP, YK.
9N, VS6, HL, 3D2, FOB, FK8,
5W1, KS6, KC4, 4UP etc, So pick-
ing up a collection of my old
cards could be of some help.
You don't hea( a lot of YA and
EP stations these days.

Another type of fake card is
the one from the DXpeditioner
who isn't where he says he is.

This type of cheating has been
going on as Jong as I can re-
member. The first really whole-
sale case where I was shown
proof of the cheating happened
around twenty years ago and
had to do with a chap operating
out of a hotel in North Africa,
signing the calls of one country
after another as he went around
on his imaginary DXpedilion. He
was saved the problem of get-
ting licenses, travel expenses,
sand in the rigs^ and other
unpleasantnesses of West Afri-
can travel through the expedient
of not bothering to move This
was an inexpensive and creative
solution to what otherwise
would have been considerable
aggravation. The cards are still
acceptable for awards.

The ruse was so transparent
that it took no time at ail before
other hams were using it and ex-
panding upon it. This was a far
simpler and cheaper way of get-
ting to those out-of-the-way
islands. . ,of operating from un-
friendly countries. During the
60s, all of us OX hunters built up
our collection of fake cards The
awards managers were well
aware of what was going on, but
didn't want to upset things by
refusing to accept the cards, so
a conspiracy of silence devel^
oped The rules were tightened a
bit to make blatant cheating
more difficult.

Miller and his cohorts pushed
things too far for even the con-
spiracy of silence to swallow. Of
course he went a step further,
not only faking his operating lo-
cations, but also charging the
hell out of members of the cult,
who by now would pay anything
to stay on top. My understand-
ing is that he charged $50 per
new country for cultists and that
this was bringing him a very nice
income . on the order of over
$50,000 a year. . .completely
tax free.

\ still run into hams in rare
spots who remember Miller
opening his mail, taking out the
money and throwing away ev-
erything else. . .piles upon piles
of mail, I know that when I wrote
my editorial and exposed some
of the things he was doing, he
sued me for $650,000 for cutting
down his income. He sued the
League for only $500,000 for be-
smirching him , . ! and lost when
it was proven that he had been
operating from places other
than he claimed. Despite all
that, I believe that my cards
from Miller are still valid

73 Magazine ■ December, 1981 183

for awards. . .and I have a lot
of them.

Just as an example, I got a
card from him from Burma.
Hmmm, I thought that no ama-
teur radio was permitted in Bur-
ma. So I went to Burma per*
sonally and looked Into it I
asked the government about
hamming. . /'no way/' I asked
the hotel where he said he had
stayed and operated from...
*' impossible/1 I asked the local
amateurs (who had been put off
the air and their equipment con*
flscated). . ."totally impossi-
ble." When I challenged Miller
with this, he changed his story
and said that actually he had
operated from a hospital in-
stead of the hotel, as he had
claimed. Since the hospitals
were under army control, not the
control of doctors, that obvious-
ly was a lie, too. But I wrote back
and had that checked out..,
"false,"

If ft were a matter of any
significance about how many
countries any of us has con-
tacted, we might look into ways
of trying to stem the cheating.
But the Importance of this as a
goal In life is about on the order
of that of the Trobriand Island-
ers and their fetish of growing
pigs with reentrant tusks.

My own experience has
shown me that an amateur with
a decent station and some oper-
ating experience can whack off
one hundred countries In one
weekend (with the help of a con-
test). It takes about a month to
get 200 worked. , .and perhaps
a year for 300, with some dili-
gence. That's what it took me.
Beyond 300 you get into cheats-
ville and the DXpeditions, That's
why f got my 300 and then
stopped counting. Now and
then I work a new oneT but I don't
know within 20 countries how
many I've realty worked, . , and I
don't care.

If the DX awards would stop
at 300, it would kill this whole
cult and free up a few hundred
people around the world to con-
template living more productive
lives. We might be able to leave
the world of counterfeiting to
those who arrange for fake
passports and wills.

Speaking of fake papers, I
was in Asia one time and found
that I had to have an authen-
ticated shot which was not on
my health record. A ham in the
country fixed that easily. He
scribbled In the shot informa-
tion and stamped it with a

checker and stamp pad. Looked
great and got me through. I
managed not to contract the
disease during the visit...
perhaps the checker did it.

There are 300 legitimate coun-
tries on the air and they are easy
enough to contact, so the ten-
dency to cheat might be avoid*
ed. It's the fast few that bring
out the worst in people. Remem-
ber that if any one of the Honor
Roll chaps misses one new coun-
try which comes on the air, he
is moved back one rung on the
ladder. . . usually permanently.
And that means falling way, way
back.

If we could take the pressure
off, we might find more DX sta-
tions on the air. I've mentioned
frequently that when I visit rare
spots I Invariably find that the
operators feel harassed and are
not very enthusiastic about
hamming. You can't blame
them; they are never permitted
to get on and rag-chew. They are
always haunted by ferocious
pileups and demanding DXers
who feel it is their right to make
a contact of at feast ten sec-
onds.,, and never mind what
the operator in the rare country
wants to do.

I've heard DXers cursing out
ops in rare spots who had given
up to go to bed or to work. Well,
if you are going to take it alt this
seriously, then you have a prob-
lem, not the DX. You are the one
who has to decide whether It Is
worth several days of your time
to get a new country. I'll Invest
up to ten minutes trying for a
new one, but that's about the
limit for me.

At any rate, getting back to
fake cards, it turns out that
some of the West Coast gang
have gone overboard and have
been printing up rare cards
wholesale and passing them
around. Complaints to the
awards people have gone un-
heeded, There is no question
about whether they really care
or not. So when one chap
brought it to a head by submit
ting a pile of faked cards all in
the same handwriting, he was
given the shaft and everything
else was quickly covered over.
At least that is the story going
around and, considering the his-
tory, it's difficult to find a
serious flaw in it.

Even the change to computer-
ized operating isn't going to
make a significant difference as
far as I can see. I can envision
the day when a DXpedition will

come on the air from Gherkin
Atoll and make contacts auto-
matically at the rate of several
thousand a minute, with the
logs being transmitted on a sec-
ond channel as generated to the
awards committees of several
amateur radio societies. At 9t600
baud, we can pass information
through at an effective rate of
about 7,500 words per minute
without special encoding, so we
will be able to get DXpeditions
over in a few hours instead of
weeks. The QSL manager would
also be tuned into the log chan-
nel and his computer would
print out and send along the
QSLs to the QSL bureaus.

But what is to prevent any
ham from programming his sta-
tion to make contacts for every*
one in his DX club? Or even to
have them check in over a two-
meter link and make their con-
tacts? And, If you want to be
nasty about it. what is the dif-
ference? Any good station any-
where in the world can make
contact with a similar station,
so all we are measuring with our
awards is the amount of time
someone Is willing to spend for
the desired award. There is no
real measure of the station, of
the ability of the operator, or
even of propagation conditions.
The awards are, essentially,
without any real merit.

So, if you won't get rid of the
Honor Roll and its pernicious
undermining of our hobby, 111 be
pushing forward toward com-
puterized contacts and the day
when we can work 350 to 400
countries in a minute or so.
Perhaps we will then set up
awards for working 400 or 500
countries every day for a year.

Five hundred countries? Sure.
That's part of the whole game.
The awards groups set up their
definitions of countries to suit
themselves. No one likes it
when he loses a country, The
fun is in working ever more of
them, so awards committees
have to come up with new ra-
tionalizations to provide us with
more and more. They can whet
our appetites by temporarily
refusing to accept this or that,
generating great and enthusias-
tic controversy.

Years and years ago. I got to-
gether with Bill Orr in Nice and
discussed the subject. He came
up with a humor article on Coun-
tries Galore in "64, Well, most of
those enclaves he joked about
at the time are now accepted
countries. With the SARL ac-

cepting Transkei and Bophu*
thatswana as countries, how
long will it take for more of the
IARU societies to accept them?
Bophuthatswana is a great one,
being spread out into a lot of
enciaves, We could make that
into twenty or more separate
countries without even trying.
South Africa, in an effort to wig-
gle its way out of segregation
problems, has a lot more similar
"homelands" which are being
contemplated. . .each a solid-
gold possibility for a new coun-
try for us.

Indeed, as I've hinted before, I
have my eye on one such ter-
ritory. As soon as it becomes a
separate country politically, I'm
planning to rush down there and
set up a station and drive you
crazy for a few days. I even have
a call in mind for it... if this
does not give anything away. Of
course, well have to run It by the
ITU first, but I think it is a winner.
I've already asked for Q5R9 for
my call Laugh, ) hope, but re-
member that I said it. when you
hear me.

Though \ am perhaps critical
of the DX awards committees
for accepting known fraudulent
cards, I can understand their
problem. With so many of the
DXers submitting them, and
with it being almost impossible
to really know for sure which are
the reat and which the fakes, it is
a no-win situation. But a simple
returning of Bob's cards might
have been more prudent, rather
than making a martyr of him by
trying to pillory him for forcing
the issue and blowing the whis-
tle.

Keep on accepting the fake
cards and shut up. Most of us
don't really care.

ZAP! YOU'RE ITI

The September editorial piece
about police radar brought in
quite a reader response. A tot of
you have been zonked by the
police, not for actual speeding,
but because your transmitter in-
dicated speed on their radar
units. You really are going to
have to iearn from the misery of
others and either cut out talking
from your car or get a detector
so that you know when to shut
up.

In case you think that being
right cuts any mustard with our
court system, forget it. I even
have a case of a ham judge who
refuses to pay heed to the ham
interference defense. Some of
us get so wrapped up in our rosy

184 73 Magazine • December, 1981

altruistic imaginations that we
forget that the purpose of police
radar is not to stop speeding but
to make money for towns . , *
and it is a fantastic money-
maker. If they say you are guilty,
you are guilty, and your best bet
is to pay up and chalk another
one up to our American judicial
tax collection system.

Getting down to radar detec-
tors, I've been testing a few
more. The newest one is by Fox,
It's the smallest one yet and is
unobtrusive on the shelf where it
can took out of your front win-
dow. It's as sensitive as any
yet . . even matching the famed
Escort, which I mentioned in
September

The Super Fox Vixen is about
5 x 3*1/2" x 1-1/4" and comes
with a plug for your cigarette
lighter socket. Since you have
no business smoking any more,
this is a fine use for that other*

wise wasted socket, On our new
Datsun Maxima, where most of
the Vixen tests have been run,
the power socket is turned on
and off by the ignition key, so I
don't even have to remember to
turn it off when I get out of the
car. Most of the radar detectors
draw enough current (300 mA)
so you will find a dead car bat-
tery if you leave 'em on while not
using your car for a few
days . . . like at the airport during
a trip.

The Vixen, in addition to be-
ing small, has the benefit of be-
ing distributed through car ac-
cessory stores and many elec-
tronic stores, so it should be
simple to find. The cost is $250>
right in there with the Escort
($245).

The only real difference be-
tween the Super Fox Vixen and
the Escort is that the Vixen has
a buzzer and light indicator of
radar, while the Escort has

those plus an S-meter. Perhaps
it is the ham in me that likes to
watch the S-meter and see when
I am getting close enough to a
radar unit to know that it can
pick up my ham rig. The Vixen
will keep you out of trouble,
which Is what you want. Be sure
that you specify a Super Fox
Vixen ... the superhet model , . .
as the firm also puts out a Fox.
which is a passive defector unit
and about 1/100th as sensitive. J
have one of those in our RX7 and
it generally goes off just as I am
passing a radar unit, right at the
last minute. Since I have both
2m and CB rigs in the can if t
waited for the passive unit to
alert me I would be off the road
by now with too many tickets to
drive.

I've found that a small square
of Velcro™ stuck to the bottom
of the unit . . and another on my
dash shelf allow it to be
whisked off the shelf when I

park the car in Boston or at the
airport. There's no use dangling
a $250 goodie right out there in
front of thieves when you can
flip it under the seat while
parked in higlverime areas. Of
course, in New Hampshire this
just isn't a problem,

Small world department: The
people who handle the promo-
tion and advertising for Fox ate
the same people who handled
DenTron. . .and are handling
OSi. the computer firm. OSIt by
the way, was bought by Macom,
the firm which makes most of
the Gunn oscillators for the
superhet radar detectors, . .and
which makes the 1Q-GH2 gear 1
used for my DXing a year or so
ago. Macom, formerly Micro-
wave Associates, is where Sam
Harris W1FZJ, the microwave
genius, used tu work before he
moved to Arecibo, The president
of Macom is an old4ime ham,
Dana Atchiey

LETTERS

DAY IN COURT

Thanks very much.

Your September issue of 73
arrived the day after I got an un-
justified speeding ticket backed
up by police radar. Armed with
the information in your editorial,
I immediately ordered the legal
index and bought an Escort. The
delivery of both was very fast
and arrived in time to assist my
court preparation.

You are too pessimistic. The
court is an adversary relation-
ship and the person with the best
preparation (among other things)
wins. A previously good driving
record is also a must, In my case
I was stopped for "37 in a 25
mph zone" based on radar. I was
sure I was not speeding and so
informed the arresting officer.
His comment was "tell it to the
judge/' After obtaining the name
of type of radar in use, noting
the other traffic immediately be*
fore meT etc., and fuming, I read
73. After obtaining and reading
the Fuzzbuster legal index and
spending a few more hours in the
local law library and in technical
reading, I called the Common-
wealth's attorney. His initial
view was; Radar is infallible.

Some states will listen to tech-
nical arguments but not VA."

After the roll was called in
court (IV2 hours of calling the
rollt listening to shoplifter cas*
es, etc.), the court got started on
the docket. In a lull, I reminded
the Commonwealth's attorney
that I intended to plead not guil-
ty and of the technical basis for
my defense (RFI from the ham
gear causing spurious readings
as adequately documented in the
manufacturer's handbook, Bu-
reau of Standards tests, etcj. I
also mentioned the other traffic
In the pattern which was pulling
away from me but not stopped, I
was supported by diagrams,
texts, etc., in a large bundle
under my arms. When the case
came before the judge, the Com-
monwealth's attorney recom*
mended dropping the charges.

It took a few hours, but just ice
is worth the effort. The Escort
works like a charm— I won't be
surprised again, I may even not
key the rig passing the radar
next time.

J.D. Peters K1 ER
Manassas VA

JO, you're not doing your
homework completely. The Car

& Driver article on American
justice is necessary reading to
dispel your euphoria. Being to-
tally and demonstrably right did
not help when the editor of Car &.
Driver tost a clear-cut case
. . , including two very expensive
appeals. When t get complaints
from hams in African countries
about the sad shape of the
courts there, I refer them to the
article to show thai our courts
are not any belter, , . the occa-
sional lucky chap like you not-
withstanding. — Wayne.

SURVIVAL

Your editorial statements and
talks concerning the relation-
ship between amateur radio and
a productive electronic engi-
neering industry such as that of
Japan have intrigued me, I
couldn't agree with you more!
But I think that there is more to it
than is indicated by the num-
bers of amateurs in a country, or
the licensing structure en*
couragmg or discouraging the
growth of the hobby. In recent
times, the professional litera-
ture in science and education
has bemoaned what has been
happening in our American
society and its effect on school
curriculum and the courses
students take, both in the high
schools and in the colleges.
(One of the more recent articles
for the general public appeared
in the Washington Post on May

31, 1961, and was written by
David G, Savage.) For some
years now many high schools
have dropped math and science
requirements for graduation.
This is also true for many col-
leges This is not true in Japan,
The Japanese educational
system is rigorous, with mathe-
matics instruction being given
in a more concentrated form
and with more students taking
the advanced courses. By the
ninth grade, the Japanese stu*
dent has had three years of
geometry and one year of trigo-
nometry. High school courses
include calculus, probability.
and statistics, Is it any wonder
that (as pointed out in the article
by Savage) Japanese leaders
often point to the rigor of their
educational system as a key to
their economic success?

In the United States, about
5% of all bachelors and masters
degrees are in engineering. In
Japan, about 20% of the bache-
lors and about 40% of the mas-
ters degrees go to engineers.
Between 1963 and 1977, produc-
tivity in the US grew 39% and
1.6% of our students became
engineers. Productivity in Great
Britain during this period grew
51% and 1.7% of the British
students became engineers. In
West Germany, productivity
was 114% and about 2,3% of
West German students became
engineers. In Japan, 4.2% of the
students became engineers and

73 Magazine • December, 1981 185

productivity went up 197%.
Make what you will of these
figures!!

As amateur radio operators,
we look to the Japanese for
much of our equipment and we
are thus familiar with their
engineering products and their
quality. We hold long and friend-
ly conversations with Japanese
amateurs, Russian equipment,
on the other hand and for the
most part, is unfamiliar to us,
The vast bulk of the QSOs be-
tween American and Russian
hams appears to be a mere ex*
change of technical informa-
tion. And nothing could be more
deadly to a friendly QSL ex*
change than PO Box 88s Mos-
cow! Yet their educational sys-
tem and its productivity is
almost awesome to an Ameri-
can educator.

In 1957, the Russians threw a
piece of iron called "Sputnik" up
into the heavens. America be*
came frightened and began a
frantic beefing up of its math
and science programs. This
lasted until the middle 60s. At
that time, while our intense ef-
forts began to go downhill, the
Russians decided to go uphill. A
recent study by the National
Science Foundation indicates
that the math and science pro-
gram required for all Soviet
students is far stronger than
that of any other nation. Not on*
ly do a considerably greater
number of Soviet students fin-
ish high school (our 75% to their
98%), but their requirements are
quite a bit tougher. For example,
a high school graduate has had
five years of algebra, ten years
of geometry, two years of calcu-
lus, five years of geography, five
years each of biology and
physics, and four of chemistry.
By contrast In the United States,
of the high school graduates,
9% have had one year of phys-
ics, 16% one year of chemistry,
and 45% one year of biology.
Savage points out that each
year about five million Soviet

high school students graduate
with two years of calculus and,
in contrast, about 105,000
American students have had
one year of calculus.

One might argue that the
forced curriculum of the Soviet
Union does lead to a resentment
of sorts among certain parents
and educators, and ought to be
tempered. But it might also be
argued that lack of a rigorous
math and science program in
the United States may be at a
price much more expensive than
the diminution of the hobby of
amateur radio. The price being
survival.

Marvin D. Solomon WB6VNP

Okemos Ml

Thanks. Marvin, for the
statistics, which are interesting.
Perhaps the tack of interest in
science on the part of our
students stems from a tack of
motivation, if such is the case, if
we could spark an interest in
amateur radio within our high
schools, then we might find our
schools more pressed to teach
math and science courses. And
consider that, if amateur radio
had continued its growth pat-
tern from the 50s into the 60s
and 70st that atone would have
changed our percentages of
students becoming engineers.
Were talking about a loss of
around 60,000 technicians and
engineers per year over the last
generation. That magnitude of
interest could have had a signifi-
cant impact on our whole educa-
tional system,

tf we had continued our
growth, I'm sure that amateur
radio would be vastly dif-
ferent. . .more advanced. * .
than it is today. Much of
amateur radio is stuck in the
30s, fifty years behind the times.
The rest of it is hung up in the
50s, only thirty years behind
technically. The amount of prog-
ress and experimentation with
modem communications tech-
niques is negligible. It t am to

HAM HELP

I'm looking for information on
an Ameco TX62 6-meter/2*meter
AM/CW transmitter I will pay
any copying and malting costs.
Also. I am interested in any
clubs in the Orange/E. Santa

186 73 Magazine * December.

Ana, California, area. Thank
you.

Dennis P. Breeden WB3KUM
4623 East Washington Ave.,

Apt. rig
Orange CA 92669

1981

fudge by ARRL surveys and my
mail, most amateurs wilt fight
hard to keep amateur radio from
changmg. Heck, I stiii hear
AMers on 75m holding forth,
Witt we continue to be left
behind as digital and high-speed
communications systems are
developed?— Wayne.

TRICKED OUT

We noted with interest the ar-
ticle in the September issue on
"Thcking-Out the FT-901f902." It
refers to a bandpass tuning fea-
ture developed by Bill Orr.

We believe this to be an error,
as this feature was first devel-
oped by Buddy Alvernaz
W6DMA when he was employed
by Jennings Radio (now a divi>
sion of ITT),

There was an article in the
May, 1958. issue of QST (page
16) which described this feature
and listed Buddy Alvernaz as the
originator.

ITT Jennings
San Jose CA

WACRAL NETS

WACRAL (the World Associa-
tion of Christian Radio Ama-
teurs & Listeners— G3NJB) runs
the following nets:

• Sunday at 0830 on approxi*
mately 3775 kHzt and at 1400 on
7075 kHz;

• Monday at 2100 on 3550
kHz (the CW net);

• Wednesday at 1030 on ap-
proximately 3665 kHz;

• Monday and Friday at 1900
on 21,350 kH2 (the overseas net).

The purpose of all the nets is
to encourage and spread Chris-
tian friendship and fellow-
ship— the main aim and pur-
pose of WACRAL Itself.

Just as a point of interest,
apart from the overseas net, the
other nets have been In contin-
uous weekly operation now for
over seven years. There is al-
ways someone on, and most
nets are controlled by me.

LD: Coiley G3AGX

Micasa, 13 Ferry Road

Wawne, Nr Hull

HU7 5XU England

ITALIAN LICENSES

the USA regarding amateur
operators was reached.

This department is ready to
assist your military or civilian
personnel holding a US amateur
license to apply for a permit in
case of a short visit in Italy or an
amateur station license with al-
location of an Italian caflslgn if
resident.

Please write for further
information.

Manuel F. Calero I4CMR

ARI (Assoc iaz ion e

Radioamatori Italian!)

Reciprocal Licensing

Department

Via Giorgione, 16

1-40133 Bologna

Italy

ROASTED FANNIES

We have the pleasure to in-
form you that on August 28,
1981, a reciprocal operating
agreement between Italy and

For some time now, Radio
Systems Technology has been
designing hidden antennas for
home-built plastic aircraft using
the nonconductive structure of
the aircraft to enclose the anten-
na radiating rod(s).

It has come to our attention
that certain builders have been
concealing the transponder or
DME antennas rn close proximi-
ty to the pilot or passengers. The
usual location of choice has
been directly under the passen-
ger or pilot seat structure.

RST would like to point out
that this places, in effect, high-
powered microwave energy In
very close proximity to a rather
sensitive part of the pilot/pas-
senger's anatomy. Bluntly, it
may be a little like sticking your
fanny into a microwave oven.

We are not clinical radiolo-
gists, nor do we have the equip-
ment necessary to determine
the backscattered field strength
of these antennas. We do know,
though, that there will be some
leakage around any ground
plane. Until a competent profes-
sional with the necessary train-
ing and equipment will volunteer
to make the measurements for
the rest of the home-building
brethren* RST is suggesting that
builders who wish to install
transponder/DME antennas un-
der the seats also laminate a
sheet of plain old aluminum foil
Into the seat structure to shield
the pilot from possible harm.
(Microwave energy will not pe-
netrate the thinnest of metal*
lie foils.)

Radio Systems Technology
Grass Valley Ca

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tsSee List of Advertisers on page 162

73 Magazine * December, 1981 187

NEW PRODUCTS

LULY POLARIZER

Robert Luly Associates hac
introduced a new product for
the satellite industry, the Luly
Polarizer The Polarizer is an
electronic rotator (no moving
parts) that replaces the mechan-
ical rotator which was burdened
with freezing or burning upf
twisting cables, and weight
problems

The Poianzer enables polarity
shift from horizontal to vertical
automatically The insertion
Joss is equal to an N connector,
a mere .15 dB. Operating current
is 12 to 15 volts at 50 milliamps
(available from standard receiv-
ers). The polarity can also hp
varied 0-180°, allowing for dual
polarization realignment after
moving the antenna from one
satellite to the next.

For more information con-
tact Robert Luly Associates, PO
Box 231 7 , San Bernardino CA
92405, Reader Service number
481.

STANDARD

COMMUNICATIONS TALKMAN

Taikman is a miniature,
lightweight, voice-actuated,
hands free two-way radio; it is
ideal for active bicyclists, snow
skiers, hunters, and even those
engaged in such pursuits as
tower rigging and construction.
Measuring only ZW wide, AW
high, and 3/4" deep, Tafkman
weighs less than one pound. It is
available in any one of five chan-
nels in the FM 49-MH? band and
will transmit up to a quarter
mile Power is provided with an
easily obtainable 9-voit battery.
The headset features a stow-
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For more information, con-
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The Tafkman from Standard Communications,

FLEA-SIZE KEYER
FROM CURTIS

A rugged, low-priced keyer
from Curtis Electro Devices
promises to be the tiny, no-frills
unit CW buffs have been waiting
for Although only 1.5*' square,
3" deep, and 3.5 ounces in
weight, the +Lilr Bugger/' as it's
called, offers many of the fea-
tures found on full-sized keyers.
plus a few of its own. The front
panel contains only a thumb-
wheel speed control. Weighting,
stdetone pitch, and volume are
adjustable internally via small
trimmers. The tungsten output
relay will easily key any amateur
transmitter, including really

tough cases such as old ship-
board transmitters. Jacks are
provided for the keyline. side-
tone output, and an external ac
adaptor. The case also contains
a compartment for an ordinary
9-V transistor radio battery.

The standard model K5 is
equipped with the Curtis 8044
chip. A second version of the
unit (model K5B) uses the new
Curtis 8044B IC which provides
the squeeze-keying characteris-
tics of the Ten-Tec, Heath, Nye,
and Accukeyer, In these models,
a squeeze released during a dot
will automatically produce a fol-
lowing dash. Similarly, a
squeeze released during a dash

The Polarirer from Lttfv
188 73 Magazine » December. 1981

The Lit' Bugger from Curtis Electro Devices,

^tV^^feiycr ?%: +

9 0C18S13 I

202bSD

Model SS-32M from Communications Specialists.

will produce a following dot, The
standard 8044 produces nothing
after a squeeze release, Squeeze-
key operators are divided into
two groups depending on how
they learned, so the K5 series
accommodates both. Nnn-
squeeze operators can easily
use either version.

The small size of the K5 plus
the three-fugged leads provided
for paddle connection allow the
unit to be attached to the side of
any standard paddle set with
double-sided mounting tape. It
fs ideal tor QRP, Field Day, DX-
pedftions, or regular station use.
Provision for a straight key is
also made.

For more Information, con-
tact Curtis Electro Devices, Inc.,
Box 4090, Mountain View CA
94040. Reader Service number
489,

TWO NEW VLF
CONVERTERS FROM MFJ

The MFJ-332 VLF converts an
HF transceiver into a sensitive

Very Low Frequency receiver. It
converts 10 to 500 kHz to 28.010
to 28.500 MHz, The MFJ-331
SWL version converts 10 to 500
kHz to 4,010 to 4.500 MHz. Both
give direct frequency readout on
your receiver.

With a VLF converter, you can
hear WWVB, ship-to-shore com*
munication, navigation radio
beacons, weather broadcasts,
and even the standard AM
broadcast band (with reduced
sensitivity).

Both units easily connect be-
tween your transceiverfSWL re-
ceiver and antenna, Tuning be-
tween 28.010 and 28.500 MHz
(4.010 to 4.500 MHz on the
MFJ-331 versfon) lets you re-
ceive the longwave band from 10
kHz to 500 kHz. This gives direct
frequency readout by ignoring
MHz numbers. For example,
28.050 (4.050 M Hz) is 50 kHz and
28.375 MHz (4,375 MHz) is 375
kHz,

There is a red LED that in-
dicates "on." The unit is by-

MFJ-332 VLF converter

passed In the off position for
normal operation. The MJF-332/
331 VLF converters are housed
in black and eggshell-white
aluminum cabinets and require
9-18 V dc or 1 10 V ac with the op-
tional ac adapter

The MFJ-332 and MFJ-331 are
available from MFJ Enterprises,
inc., PO Box 494r Mississippi
State MS 39782. Reader Service
number 482.

CTCSS ENCODER FOR
ICOM IC-2AT HANDHELD

Communications Specialists
Introduces their new SS-32M mi-
cro-miniature programmable
CTCSS encoder for use In the
(com IC-2AT hand-held. The unit
Is based on the popular SS-32
encoder and is programmable
using jumpers. Measuring just
^A5"xJ6"x.^31'1 the SS-32M
may also be used in other ap-
plications where size is critical.

For more information, con-
tact Communications Special-
ists, inc., 426 West Taft Avenue,
Orange CA 92667: Reader Ser-
vice number 488.

600 SERIES CES/MICROPAD

Communications Electronics
Specialties introduces its new
600 series encoding micropad
with DTMF ANI and numerous
other features ideal for mobile
amateur operations.

"The series 600 micropad/'
according to CES President Ron
Hankins, "Is compatible with
any transceiver and offers a
reliable and convenient design
for the mobile radio operator,
automatic PTT for "one-handed'
dialing, and ruggedized com-
ponents."

The micropad incorporates a
single-contact tactile keyboard
for highest reffability. The series
600 is crystai-controlled and
features a quality dynamic car-
tridge, adjustable tone level,
and built-in tone monitor speak-
er. Noise-free dialing is made
possible by a design element
which mutes the microphone
when the tone pad is in use.

600 series specifications in-
clude: 10-15 V dc; 13 mA operat-
ing current; -25° to 70* C tern-
perature range; ANI speed of 5
tones/second, and an ANI ca-
pacity of 2 codes up to 15 digits
each.

For more information on CES
encoders and other quality CES
products, contact CESf PO Box
50? \ Winter Park FL 32790.
Reader Service number 487.

ICOM IC-3A/IC-3AT
220-MHZ HAND-HELD

loom is very excited to an-
nounce a second cousin to the
popular IG-2A series—the IC-
3AT lor coverage of the 220-MHz
band. The IC-3AT is essentially
identical in appearance, size,
and operational features to the
popular IC-2A series.

Most importantly, all ac-
cessories, including battery
packs, chargers, microphone,
etc, are completely compatible
for the IC-2AT and I03A series,
so a ham who has already in-
vested in an IG-2A system with
accessories can use those
same accessories on the IC-
3AT.

The 1C-3AT also includes a
16-button DTMF pad. It covers

the entire 220-MHz band from
220 MHz to 224.99 MHz and is
set up for both repeater and
simplex operation. The power
output is nominally 1,5 W with
the standard IC-BP3. The IC-3A
system comes complete with (C-
BP3 nicad battery pack wall
charger, belt clipt rubber due kie,
and wrist strap.

For more information, con-
tact learn America, fnc.p Suite
307t 3337 Towerwood, Dallas TX
75234,

COMMSOFT CODEM

The COMMSOFT CODEM, a
universal CW interface for per-
sonal computers, is now avail-
able for radio amateurs, The
CODEM provides an easy way to
get your Morse code software
on the air Converting received
CW audio to RS-232 or TTL
signal levels and RS*232 or TTL
signal levels to transmitter key-
ing, the CODEM doubles as a
code practice oscillator and CW
regenerator.

A sharp 800-Hz bandpass fil-
ter, AM detector, and low-pass
filter are designed into the CO-
DEM to provide outstanding
noise and QRM rejection, CW
can be monitored using an Inter-
nal 2Tt speaker or an external
high impedance earphone.
Front-panel sensitivity; tone,
and volume controls are provid-
ed; The CODEM comes with a
comprehensive manual which
includes operating details and
connection instructions. The
CODEM requires an external 9 V
dc power supply.

For more information, con-
tact COMMSOFT, 665 Maybeit
Avenue, Pato Aito CA 94306.
Reader Service number 483.

73 Magazine • December, 1981 189

—

COMMDSOFT

SfNSrTlVJT*

TCWt

VOLUME TOWfefl

CW interface from COMMSOFT.

CODE SOFTWARE PACKAGE
FROM COMMSOFT

Hams who own Heath com-
puters can send and receive
Morse code with the new CW89
software package from COMM-
SOFT. The program includes a
split screen display, 4-99 wpm
operation, receive autotrackT a
1000-character pretype buffer,
10 user*definable messages,
unique break in mode, on-
screen system status, disk I/O,
hard copy, and a versatile code
practice section.

The CW89 program runs on
the Heath H-8/H-19, H-89, or
Zenith Z89 computers under
HDOS. One disk drive and 32K
RAM are required. A hardware
interface, such as the COMM-
SOFT GODEM. is also required,
A complete package consisting
of CW89. the CODEM. a com-
puter interconnect cable, power
supply, complete documenta-
tion, and shipping is available.
For more information, contact
COMMSOFT, 665 Maybetf Ave-
nue, Palo Aito CA 94306, Reader
Service number 480.

REPAIR KITS FOR
EIMAC TUBE SOCKETS

Varian Eimac announces

PartsKtts— emergency repair
kits for popular power grid tube
sockets used in many broadcast
and communications HF/VHF
transmitters worldwide.

PartsKits provide replace-
ment items so the user can re-
pair a damaged socket quickly
and at a fraction of the cost of a
new socket.

Presently available through
franc hised Varian Eimac distrib-
utors are PartsKit-300 for the
SK-300/300A sockets, Parts-
Kit-840 for the SK-840 socket,
PartsKit-1300 for the SK 1300/
1320 sockets, and PartsKit-1500
for the SK-1500/1S10 sockets.

For more information, con-
tact Bill Orr, Varian Eimac, 310
Industrial Way, San Carlos CA
94070 Reader Service number
485.

DMM FOR MICROPROCESSOR
INTERFACING

Sabtronics announces their
new model 2020 digital multime-
ter with microprocessor inter-
faces to adapt to all the popular
home/personal computers.

Combining a high-quality mul-
timeter with a microprocessor
interface expands the Sabtron-

Modet 2020 DMM from Sabtronics

ics product line to provide new,
cost-effective solutions to data
acquisition problems.

The model 2020 DM MM has an
impressive 0.1% basic dc ac-
curacy with 3Vs digit large LED
display for normal bench use.
The new DMM is capable of di^
reef iy measuring ac and dc volts
up to 1000 V, Ohms to 20
megohms, and ac and dc cur-
rent to 10 Amps

Optical coupling between the

DMM and the computer protects
the computer from damage and
also serves to isolate ground
noises that can affect sensitive
measurements. The model 2020
DMM will mate with most popu-
lar computers.

For more information, con-
tact Sabtronics International,
inc., 5709 N 50th St. Tampa FL
33610, Reader Service number
484

BEACON EXPERIMENT

AUTHORIZED FOR 10, 18,

AND 24 MHz

The Federal Communications
Commission has authorized the
establishment of an experimen-
tal radio beacon on the bands
10.100-10,150, 18.068-18/168,
and 24 890*24.990 MHz, these
being the bands allocated for
amateur radio use by the World

Administrative Radio Con-
ference, Geneva, 1979. The ex-
periment is intended to permit
amateurs to become familiar
with the characteristics of these
bands, simplifying the scheduled
future changeover to amateur
use. to improve amateur use of
these new parts of the spec-
trum, and to provide data on
sharing between different ser-

vices. An important element is
securing data on propagation
under weak signal conditions,
typical of natural disaster situa-
tions. It will be recalled that this
use is one of the major reasons
for these new authorizations,
the first in many years.

The experiments will include
two emission types, three oper-
ating modes, and two time
phases, Basic emission is un-
modulated carrier (A0), inter-
rupted each ten minutes for an
SSB {2.8A3J) identification and
announcement, this occurring
at 2, 12. 22, 32, 42, and 52
minutes past the hour. An^

nouncement will be of the form:
"This is FCC authorized ex-
perimental station KK2XJM,
Daytona Beach, Florida. OSL
via W4MB. Next operation will

be repeated on MHz

starting on * and will be

repeated.

Initial operations will be at 3
Watts ERP, on 10 MHz, com-
mencing about the first of Octo-
ber. In stages, the schedule de-
pending on results, operation
will include 18 and 24 MHz. Later
phases will include operation at
30 Watts ERP, with sequencing
from band to band, sometimes
weekly, sometimes daily, as

190 73 Magaztne • December, 1981

needed to make optimum use of
the bands for propagation ex-
periments, worldwide and to
specific areas.

Licensee for the experiment
is Robert P. Haviland, amateur
call W4MB. The success of the
experiment depends on par-
ticipation by amateurs and SW
listeners, and on their reports.
Information needed is date,
time, and location of reception,
strength of signal and of other
signals on the band, and nature

of the receiving installation,
Afi reports will be acknowledged
by G3L

In addition to reception re-
ports, proposals for special
tests will be welcomed, subject
to the limitations imposed by
the license and by regulations
for experimental stations. At
this time, there fs no authoriza-
tion for communication with
amateur stations.

Reports, requests for sched-
ulesr and proposals for experi-

ments may be sent to W4MB at
the Cailbook address, or to R.P.
Haviland, 2100 South Nova
Road, Box 45* Daytona Beach
FL 32019.

ID RULE CHANGES

On October 1t the FCC an-
nounced a change to 97,84, the
rule dealing with identification
of an amateur station* Section
(a) of 97.84 has been changed to
read:

MEach amateur radio sta-
tion shall give its call-
sign at the end of each

communication, and ev-
ery ten minutes during a
communication."

The change deletes the re-
quirement for giving the callsign
of the other station at the end of
the contact. However, both calf-
signs must be given at the close
of any communication involving
international third-party traffic.

RTTY LOOP

Marct, Leavey, M,D. WA3AJR
4006 Winfee Road
Randallstown MD 21133

The original Waht cordless clipper,

Let me take a look outside, at
December in Maryland. Hmm. . .
"The weather outside is freez-
ing, and the RTTY machine is
teasing. So since you've got
nothing to do, caM CQ, call CQ,
call CQT' Here we are againt
with the holiday season fast
approaching. Last year, I
described several gift sugges-
tions designed to gladden the
heart of any RTTYer. By your
response, I see that this outing
was well appreciated. Let's do it
again right now.

I'm going to start by telling a
story. Once upon a time, ohr say
about 1968, a company out in
Sterling, Illinois, introduced a
cordless hair trimmer to the bar*
bers and beauticians. Featuring
a nifty little case which housed
a nickel-cadmium battery, it
dropped into a stand into which
a charger was built. Convenient,
portable, and well designed, the
clipper was an immediate suc-
cess in the industry,

The company then decided to
look around to see what other
uses this little dynamo could be
put to. Not having any precon-
ceived notions, the engineers
added a resistive element
across the battery and came up
with a cordless rechargeable
soldering iron. Not only the com-
pany's own marketing people,
but also many others greeted
this new device with less than
total enthusiasm.

Nonetheless, in late 1971, the
Wahl Iso-Tip cordless soldering
iron was introduced. By mid-
1972, the product began to
trickle down to consumers and
we hams became the biggest
boosters. For working on print-
ed circuit boards, especially
with static-sensitive com-
ponents, the Iso-Tip is hard to
beat. Because ft is not connec-
ting to the line, the possibility of
passing through a charge is mini-
mized. Sitting In Its charger, the

iron is always ready, reaching
soldering heat within seconds.

My iron quickly became one of
the most used tools in the shack,
whether for revising a circuit
board, fixing a plug, or using the
built-in light Eo illuminate the re-
cesses of a piece of equipment.
Since that time, the R&D
boys at Wahl have not stood
still. The original iron took 12 to
16 hours to fully charge. This is
fine if all you are going to do is
an occasional job or two. The
capacity of the iron, fully
charged, is about 125 solder
joints. So, if you have to hot-wire
a board or fix a chip, all is well
and good. But there is no way to
build something complex, with-
out stopping after an hour or so
for recharging, A "quick-
charge" model was then intro-
duced, which charged to capaci-
ty in three to four and one-half
hours. By dropping the iron into
the recharger between joints,
larger jobs became more prac-
tical. The latest development
along these lines came in 1977,
when the "iso-Tip 60" was intro-
duced. This one will charge in
only one hour, enough to keep
anyone happy.

Continuing the search for in-
novative uses lor that nickel-
cadmium battery, other items
have been added to the line, A
nifty little drill is available that
slips over the top of any of the
soldering irons. The drill holds a
fine bit ideal for drilling out
holes in printed circuit boards.
Automobile battery charger
cords and various soldering tips
and bits round out the por-
table line.

That nice little drill, by the way.
is also produced in a self-
contained version, powered ei-
ther by a transformer from the ac
mains or an automobile battery.
Another fine addition to the tine.

When looking for a gift idea to
satisfy the ham involved In RTTY

73 Magazine • December, 1981 191

The Wahl fso-Tip line.

or computers, this line may just
turn the trick. Prices range from
a few dollars for a soldering tip
to under thirty dollars for the
basic iron with drop-In charger.
The quick-charge Iron Is about
five dollars more, and the drill at-
tachment about twefve. Look for
them at your local dealer, or write
to the WahJ Clipper Corporation,
2902 Locust Street, Sterling IL
61081. Be sure to tell thern you
read about the Iso-Tip here, in 73
Magazine's RTTY Loop.

In the market for something a
bit more, shall we say, meaty?
How does this strike you: a hard-
limiting FSK demodulator, capa-
ble of handling 17CK 42S, and
850*Hz shifts; of Interfacing with
20-mA or 60-mA loops or RS-232
or TTL4evel logic; with autostart
and built-in tone keying; ail in a
case twr>thirds the size of this
page and costing under S250?
Well, it strikes me just fine, and 1
call it (or more properly IRL calls
it) the FSK500. This demodula-
tor looks like the way to go for
the ham looking for a compact
but effective unit for a modern
RTTY station Next monlh I will

192 73 Magazine • December. 198 1

The Waht printed circuit drill

go over this beasty in detail, but
if you want to pick one up now, I
am sure that the folks at iRL
would be happy to oblige. Drop
them a note at iRLt 700 Taylor
Road, Columbus OH 43230, Don't
forget to plug RTTY Loop, OK?

Now, let's look at a new RTTY
activity. The Chicago Area RTTY
Repeater Society (CARRS) has
announced its first RTTY Art
Contest. Running from Novem-
ber 1, 1981, through February 28,

1982, the contest seeks new
RTTY art. All entries must be
original to licensed radio
amateurs and their immediate
families and must not have been
transmitted before November 1,
1981. Entrants must supply one
unspliced five-level tape and
three prints for each entry sub-
mitted. Format specifics in-
clude no limit on running time
and a maximum of 72 charac-
ters per line. Entries must be
compatible with machines run-

ning **downshift-on-space."
Each line should be terminated
with a minimum of three func-
tions; CR-LF-LTRS sequence.
Entrants agree that the submit-
ted picto re(sj may be used, du-
plicated, and published for any
purpose by CARRS.

Judging will be by the CARRS
Board of Directors and will be
based on originality and tech-
nique. The winning entry will
earn the winner a reconditioned

CORRECTIONS

Several readers have pointed
out a potential problem using
my program for transmitting
and receiving Morse code with
the TRS-80 Level lf appearing in
the September issue rTRS-80:
Your Electronic Bra sspo under"),

if the program is to be used
only for transmitting code from
the keyboard without first con-
necting the 1NS8255 interface

represented in Fig. 10{page94)t
the program will lock up within
the downtime loop between
memory locations 4607h and
461 4h of Fig. 3 (page 91 1 This
problem may be solved by sub-
stituting a JPTX statement for
the CALL SKEY statement ap-
pearing at memory location
4583H, The resulting line would
then appear as;

4583 C34047 JP TX
;Jump around SKEY

If at a later date you wish to
utilize the receive program, the
statement may be reinserted
without any difficulty.

I have failed to provide the pin
connection of pin $ of the
1NS8255. This pin is the chip
select, and for my purpose I
have tied it to pin 7, making the
chip always selected.

There have been inquiries as
to whether I have modified the
program for Level II. The modi-
fied program has the following
improvements made to it:
• The buffer space is cleared to

Teletype* ASR-33 complete with
modem, FOB Chicago. Send en-
tries to Howie WA9KEK. 1752
North Austin Avenue, Chicago
IL 60639.

As I mentioned a few para-
graphs ago, the FSK-500 will be
on tap for next month. Never one
for organization, I might just
scrape up another item or two—
you'll have to wail ar\(S see. You
never know what might turn up
here, in RTTY Loop.

prevent a garbage, end of buffer,
flag from being inserted.

• The video screen is cleared on
program entry.

• Return to BASIC is allowed
from the program.

• The operator is given a
prompt for message entry.

• Program is written in Assem-
bly language using Radio
Shack' s Editor/ Assembler.

Anyone interested in obtain-
ing a source listing may write
to me.

Donald C. Downs NdAGX

1705 S. 5 Street

MarshalltownlA50158

BEEPER

The Professional Touch
Comes to Amateur Radio!

• fl**3

10 >A0i£at#

i Htm beep to

BP-3A: case, cable, standard 4- pin
connectors ..*.. S39 95 ppd

BP-3B; same as above, without con
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BP3C: circuit board only, for
custom installations. . £29.95 ppd

All models are auamototinwifsd and carry a 90 day limited warranty We
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**$** Ust of Advertisers on page tS2

73Magaztne • December. 1981 193

OSCAR ORBITS

SATELLITE NEWS

UoSAT OSCAR 9 Launched

Satellite enthusiasts now have another "amateur*1 bird to chase.
UoSAT, a British satellite that combines research and amateur ap-
plications, was successfully launched early on the morning of Oc-
tober 6, Listeners were able to copy a signal from UoSAPs two-
meter beacon, starting with the first orbit. Once aloft, the satellite
was dubbed the "UoSAT-OSCAR 9 spacecraft.

»i

UoSAT is not a communications satellite but it will be transmit*
ting on a variety of amateur frequencies. For a more complete
description of the satellite's capabilities, which include slow-scan
television, see "Phase Ml and Beyond" on page 96 of the September.
1981, issue of 73*

OSCAR 8 Still Flying High

Despite the demise of OSCAR 7, hams are stiff communicating via
satellite. Recent accomplishments made via the OSCAR 8 satellite
include the first mode J Worked All States Award which is credited
to WA6GVS. Following on his heels, W7UFE completed mode J
WAS. In doing so, he has become the first person to accomplish
W.A.S. on each of the satellite modes. Af Bt and J.

The DX scene was busy, too, with a record-setting mode J QSO
between W4AU2 and GM41HJ. Details about tracking OSCAR 8 can
be found in the November issue of 73.

Phase III Looking Good

Plans are being made for the launch of Phase IIIB, a replacement
for the ill-fated original Phase tlf satellite. The third test of the Ariane
rocket was a success, representing a tremendous breakthrough
after Ariane's failure on May 23, 1 980. AMSAT officials are preparing
for a Phase III B launch in the fall of 1982. For more details about the
Phase III program and other aspects of the amateur satellite service,
contact AMSAT, PQ Box 27, Washington DC 20044.

An error crept Into the calculation of the OSCAR orbits published
in the October and November issues of 73. As a result, the equatorial
crossing times are Incorrect. Hopefully, the December predictions
represent a great Improvement in accuracy.

ORBITAL INFORMATION

OSCA* I ORllTAL 1 KTGRHATlQl* ?QI SCCDIM*

OSCAR 1 ORBITAL IStFOHHATmSi FOR JAMUAJtY

OR* IT •

19#6 3

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1*1 4 I
1*174

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19216

11211
1*244
11*51
1*273
19JC6

lint
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1*321
If

1*371
1*114
lWi
19412
19424
1*441
1*414
1*4* I
1**11

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Selling 73 Magazine, the ham radio magazine
that otters quality and quantity, brings the
ham into your store. Once through the door
you can sell him anything.

Our dealers are telling us that "73" outsells
them all. . .so call today and join the dealers
who make money with 73 Magazine.

For information on selling 73 Magazine
call 603-924-7296 and speak with Ginnie
Boudrieau, our Bulk Sales Manager. Or write

to her at:

194 73 Magazine * December, 1981

MM HELP

I would great ly appreciate any
information (schematics, ser*
vice manuals^ performance im-
provement, etc.) on the follow-
Ing equipment:

a) Clegg Thor 6 transceiver;

b) Simpson Model T marine
transceiver;

c) Konel Gemini III marine trans-
ceiver;

d) Johnson Ultracom 3l>5l>MHz
FM transceiver;

e) Lafayette PB-50 30-50-MHz
FM receiver.

I will copy and return manuals
and refund postage costs.
Thank you,

Gary B. Trustle WB8SPV

424 Franklin Ave.

Waverly OH 45690

Help, help! We have a Telrex
beam, Model TBS~3Q8f and need
any information available on
assembly details to permit cor-
rect operation on certain fre-
quencies. It is a tri-band beam,
traps and all. apparently two

elements on each band. Any
data would certainly be appreci
ated. Telrex Labs does not have
data on this old a beam, I will
cover any duplication costs if re-
quired and postage. Thanks for
any help.

Paul Wlegerl W8TH

1205 E Franklin Street

Centervllle OH 45459

I need manuals/schematics
for the following units: EICO 752
dc power supply. Standard Com-
munications SR-C803L VHF FM
transceiver, Triplett 3434 TV-FM
sweep/marker generator, and
Clegg HT-146 2-meter handle-
talkie.

I would prefer to buy, or copy
and return your original, espe*
cially on the HT-146 as Clegg
does not have an original. And
does anyone have a battery for
the Clegg?

John E. Carter WB4HLZ

2622 Rolling View Drive

Smyrna GA 30060

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73 Magazine * December, 1981 195

TR-7730 from page 27

doesn't help matters much,
but under most daylight
conditions, the display is
pretty hard to read The
other two problems I en-
countered involve the scan-
ning circuit. There are an
awful lot of 5-kHz split
repeaters out there now,
and it would be useful if
the band-scanning circuitry
stopped with the discrim-
inator centered. There are
currently only two rigs
available that offer this fea-
ture (that I am aware of)—
the Azden and the KDK

2025. Finally, for some rea-
son the rig scans much
slower in the memory-scan-
ning mode than in the band-
scanning mode. It should
be easy to speed up the
scan rate; the first person
to come up with a good
mod is guaranteed an arti-
cle in 73!

These last two points are
purely personal opinion,

and others may never com-
plain The dim display is
another matter and has
plagued almost every two-
meter rig I have used. It's
time for the industry to

correct this problem, I'd
like to see a blue display
like the one on the TS-830S,
with a dim switch for night-
time driving. I realize that
it would be expensive, but
the ultimate solution might
be a light-sensing circuit
like the one found on the
IC-701.

Conclusions

Simply stated, the Ken-
wood TR-7730 is one of the
best two-meter FM rigs for
mobile operation I have
used. I have used rigs that
offered more features, rigs
with better receivers, and

rigs with brighter displays,
but I have yet to test any-
thing that combines the fea-
tures, performance, com-
pact size, and reasonable
price of the TR-7730, For
home use I might prefer
something with more mem-
ories, like the new KDK, the
TR-7850, or the Azden. For
installation in the small cars
that Americans are wont to
buy, the TR-7730 is sublime.

For more information,
contact Trio-Kenwood

Communications, Inc., 1111
West Walnut Street Comp-
ton CA 90220, ■

KAHANER REPORT

Larry Kahaner WB2NEL
PO Box 39103
Washington DC 20016

CORRECTION

For those of you who wrote to
me about my column on compe-
tition for AT&T in the local and

long-distance market (Oct., 81), I
noticed the error also. Seven
digits comprise a local phone
number, not five as mentioned.

STALKING THE WILD BUCK

The buck never stops any-
where in Washington. It just
kind of makes the rounds.

The FCC complains it lacks
the power to do Its job, It says
the Communications Act of
1934 Is too out of date to allow
the Commission the legal lee-
way it needs to cope with our
new technological age. The Act
never envisioned millions of pri-
vate radio users, large numbers
of radio and TV sets, and an era
where information would be a
money-making, fast-trading
commodity like rice and wheat.

According to the FCC, the Act
doesn't give it permission to pull
licenses of violators— they must
trek through lengthy court pro-
ceedings—or set minimum stan-
dards for receivers making them
Less susceptible to interference.

Congress, on the other hand,
has tried to rewrite the Act every
session for the last 10 years, but
so far has only succeeded in

tacking on some satellite
amendments in the early 1960s.
In addition, Congress com-
plains that the FCC doesn't use
the powers it does have under
the Act and is afraid to flex Its
muscles fearing some court will
overturn the administrative deci-
sions- The bickering is boring.

During the peak CB surge of
1977, the Commission logged
more than 110,000 interference
complaints. About 85% were
traced to CDers overloading
nearby TVs or assaulting them
with harmonic radiation. Since
then, the average number of
complaints has never dipped
below 60,000 per year. And
that's half the actual count; the
FCC estimates that that figure
represents less than half of in-
terference incidents.

Again the FCC laments that it
doesn't have the legal right to
set minimum standards for TVs.
Congress doesn't amend the
Act, so nothing happens at all,

But although the FCC sup-
posedly wants that power, and
some others, it's not helping
Congress to rectify the situation.

In 1978t the FCC launched an
inquiry Into interference. It was
to be the final word on the sub-
ject. Part of the reason for the in-
vestigation was to present Con-
gress with facts about interfer-
ence so when the time came for
it to tackle the problem, the law-
makers would be well prepared.

The unfinished 3*yearold re-

port, broached at a recent FCC
meeting, stated: "Minimum
standards for receiving equip-
ment might be necessary." It of-
fered no details, no technical
standards,

FCC commissioner James
Quello angrily referred to the
sparse report during the June 17
meeting and said; 'There hasn't
been any movement since 1978,
and the interference is getting
worse. How many more years do
we need?"

The Commission wanted to
present the report to Congress
in response to several recurring
bills to regulate TV susceptibili-
ty to interference. Congress
asked for FCC comments and
guidance and this report was
supposed to supply It, Said
Ouello: "And what do we tell
them [Congress]?"

Commissioner Anne Jones re-
sponded sadly; "Let's start with
an apology."

Even though the FCC is sup-
posed to know more about com-
munications than any other gov-
ernmental agency, their input to
Congress in this case appeared
minimal

This year, Congress seems
closer to revamping the Commu-
nications Act than during any
other session. Although most of
the bill — commonly referred to
as the Domestic Telecommuni-
cations Act of 1981 (S-898}—
deals with common carrier and
broadcast matters, some provi-
sions affect hams, CBers, and
other private radio licensees.

Now that the bill heads for the
Senate floor, the FCC has
jumped up and put In its 2 cents
worth. If the FCC suggested any

courses for Congress to follow
during the writing, the law-
makers certainly didn't pay that
much attention. Some FCC
suggestions— called amend-
ments—deal with semantics,
others with substance.

Without going into the bill's
details, here are some FCC
amendments submitted to
Congress;

• Give the FCC permission to
employ volunteer amateur radio
operators to administer tests to
those seeking licenses of equal
or lower rank,

• Allow use of volunteer
hams and CBers to monitor air-
waves for violations.

• Permit aliens to obtain op-
erator licenses.

• Allow elimination of C8 li-
censes,

• Allow suspension of li-
censes of those who aid and
abet violators.

• Allow the FCC to issue
cease and desist orders in
cases of safety.

The FCC proposes many
other items, but these most di-
rectly impact hams and CBers.

You might know that the FCC
doesn't need Congressional
mandate to permit volunteer li-
cense proctors. General ctass li-
cense holders and above now
administer tests to Novice
hopefuls. Nor does the FCC
need permission to allow aliens
to hold licenses. It does that
now in some cases.

So, why bother? For one
thing, a bill reassures the FCC
that it really has all that power.
Secondly, the Act ties It all up in-
to one neat bundle, and the FCC
doesn't have to take it upon

196 73 Magazine ■ December, 1981

LATEST RECIPROCAL LICENSING AGREEMENTS

Hare's an updated reciprocal licensing/operating list:

Argentina

Australia

Austria

Bahamas

Barbados

Belgium

Bolivia

Botswana

Brazil

Canada

Chile

Colombia

Costa Rica

Denmark

Dominican Rep.

Ecuador

El Salvador

Fiji

Finland

France

West Germany

Greece

Grenada

Guatemala

Guyana

Haiti

Honduras

Iceland

India

Indonesia

Ireland

Israel

itaiy

Jamaica
Jordan
Kiribati
Kuwait

Liberia

Luxembourg

Monaco

Netherlands

Netherlands Ant,

New Zealand

Nicaragua

Norway

Panama

Paraguay

Peru

Philippines

Portugal

St. Lucia

Seychelles

Sierra Leone

Solomon Islands

Spain

Surinam

Sweden

Switzerland

Trinidad & Tobago

Tuvalu

United Kingdom

Uruguay

Venezuela

Yugoslavia

LATEST THIRD-PARTY AGREEMENTS

The FCC issued an updated third-party list:

Argentina

Bolivia

Brazil

Chile

Colombia

Costa Rica

Cuba

Dominican Rep.

Ecuador

El Saivador

Gambia

Ghana

Guatemala

Guyana

Haiti

Honduras

Israel

Jamaica

Jordan

Liberia

Mexico

Nicaragua

Panama

Paraguay

Peru

Trinidad & Tobago

Uruguay

Venezuela

Also, ITU headquarters In Geneva, station 4U1ITU

itself, administratively, to
change any regulations

No one knows if the bill win
pass, even though it seems well

on its way. However, if it speeds
towards the president for his sig-
nature, there's no guarantee
that Congress will slow down

and consider the FCC proposals.

At presstime, the Senate

unanimously passed bill S-929

which gives the FCC absolute
authority to set minimum stan-
dards for TV sets and other re-
ceiving equipment. Titled Ama-
teur Radio Service and Private
Land Mobile Services Act of
1981, the bill won't apply to ex-
isting equipment

Other sections; License terms
raised from 5 to 10 years, hams
and CBers permitted to monitor
the airwaves in their own servic-
es for violators, and hams may
administer licensing tests.

The bill passed the Senate on-
ly after it added an amendment
giving the FCC permission to
eliminate CB licenses.

FCC chairman Mark Fowler
lobbied for and received the last
concession. He wants the Com-
mission out of the CB licensing
business and claims the move
will save the FCC more than $Y*
million a year.

No one is sure if that bill will
pass either.

Note the wording in each bill.
Each gives the FCC permission
to do all these new things, but
doesn't force It to do so.

Perhaps it doesn't even mat-
ter. Each side has excellent ex-
cuses for not doing anything
and neither wants to jeopardize
that safe position. Make no deci-
sions, make no enemies.

And the buck just keeps on
passing.

LOOKING WEST

Bill Pasternak WA61TF

c/o The Wastlink Radio Network

Suite 718

7046 Hollywood Blvd.

Hollywood CA 90028

A CHRISTMAS PRESENT:

SANTA BARBARA'S
SUCCESSFUL REPEATER

We begin this year's Christ-
mas special with a true success
story, the story of a two-meter
repeater located near the city of
Santa Barbara, California, What
puts this system a cut above the
rest? Think In terms of other
stories you have read in this col-
umn—stones depicting the rise

and fall of other repeater sys-
tems. Also remember that the
2-meter FM scene in southern
California has never been very
stable. Rather, It's f actionalized.
Where else In the nation are
146.34/94 and 146. 16/. 76 still
simplex channels for the most
part? Yet the WR6ANW repeater
has survived and prospered. Not
because it's away from Los
Angeles proper, but rather be*
cause things were done right to
start with. Here is the story as
told by Jay Hennigan WB6RDV
in the June, 1981, Issue of Key*
KUx, the monthly newsletter of
the Santa Barbara Amateur Ra-
dio Club.

A HISTORY OF KSTZm
A Gift from Delco

The SB ARC 2-meter repeater had
Its humble beginnings as a portion of
a gift of surplus Motorola radio
equipment donated by Delco Elec-
tronics. The equipment consisted of
two 150-MHz dish antennas. AIJ of
the above was immediately scattered
throughout the county t with the ma-
jority winding up m the garage of
WA6GOO on Palisades Drive, This ar-
rangement made it rather difficult for
DarryJ to put cars in his garage, con
sidenng that a certain individual had
a Progress- Una autopatch and a
jukebox or two stashed there as well,
The dishes, and a lot of the Jess-im-
mediately usable gear, wound up in
the backyard of Sonatech, Inc., work
QTH of WB6RDV, WA60QZ, and
WA8LWJ,

Where to Put It?

Obviously, such a generous gJft
was destined to become a 2-meter
repeater. The only remaining ques-
tions were at what location and on
what frequency. Several physical lo-

cations were scouted out, with the
final location picked as the city radio
site on Lavjgia Hill on the Mesa. One
thing the city required was a state-
ment by a licensed civil engineer that
our tower, Identical to several other
towers Installed by the city at the
same location, would not fall down.
This survey was provided free of
charge by Dave Harris, father of
KA0OFZ The next question was one
of frequency. Some people within the
club felt that our repeater should be
on a "common pair" such as 146.34/
,94 or .16/76. In those days, 99-plus
percent of amateur 2 meter gear was
crystal -control led. which resulted in a
conflict between having the repeater
on one of these "common" frequen-
cies, making It available to most
amateurs passing through town, and
the refusal of several hundred south*
ern California FM pioneers to give up
.94 and ,76 as simplex frequencies.
The club looked into several other
pairs and eventually a tape recorder
was Installed at the site to listen to
two different frequencies as possibil-
ities (146.19 and 146.22), The selec-

73 Magazine • December, 1981 197

—■

tion was 146.10, having the least co
channel interference, and a sanction
was received from the Southern Cali-
fornia Repeater Association lor its
use. The club now had a location and
a frequency, All that was needed was
some personpower and a license.

A Taste of Root

In the good old days, licensing a
repeater was about as much of an
Of deal as licensing a nuclear power
plant Is today. The FCC required
numerous drawings, sketches, sche-
matics, and calculations, and it
seemed as if they were sadly lacking
In the people needed to review and
process all of this material. A thick
packet was sent to Washington by the
club's technical committee, and as
we waited we were not Idle, The
dupiexer, antenna, and lower were
ordered and received, along with
some 75*Ohm hardline, which was
definitely not ordered. A call to the
manufacturer revealed that It was
their goof. UPS and the post office re-
fused to cany the stuff back to LA for
exchange, although it would and did
fit in the back of a VW, Wlnnte, now
KA60F2, ran It down to LA for ex-
change. After what seemed like an
eternity with no word from the FCC,
K6YX, our then-trustee, called on
them In Washington (in person) and
was informed that the license had
been processed with a call of
WfleANW. The Identifier was pro-
grammed and the repeater was test-
ed. When the license arrived in the
mall it had the call of WR6ANW and
the root-beer box was born*

Out ©I Control

Although we now had a working
repeater, there was no way to control
It. The club had installed a telephone
line at the site for a dial-up control
system, but no such control system
had been built. The trustee stated
that if there was no control system by
January of 1977. the repeater would
go off the air, WB6RDV and company
worked feverishly on New Year's Eve
and came up with a dial-up control
system. No tone decoders were
available at the time, so the control
codes consisted of dialing an
unlisted phone number. One call
would turn the repeater off and the
next call would turn it back on, Every
so often, the repeater would myste-
riously go oft the air due to someone
dialing a wrong number This "tem-
porary" control system was upgrad-
ed with the addition of some touch-
tone™ decoders to give a more
positive on-and-off command , and
was to be replaced when the new
cactus-style control system was
completed. Parts were ordered and
meetings held with Alan Burgstahler
WA6AWD, who agreed to sell us
blank PC boards and plans to build
the sophisticated control system
that we have today.

The boards were farmed out to
many club members for drilling and
stuffing with parts. The temporary
control system, it seemedh was going

to be rather permanent as progress
on completion of the new control
system was exceedingly slow. A new
receiver was donated by Dean Dods
WB6IYW and installed to cure
several problems which were devel-
oping with the old tube-type receiver.
it became evident that the newness
was wearing off and several correc-
tive maintenance items were neces-
sary. Our new antenna was taken
down for repairs and the duplexer
had one cavity go bad {which was
sent back to the manufacturer). In ad-
dition, the city was in the process of
expanding their building right over
the area where the repeater was
located. A work party retrenched the
antenna cable and the repeater was
moved to a wooden pail at about 10
feet from its former location. The
electric power and telephone line
were brought out by extension cords
draped through the bushes, and the
"temporary" control system was still
In operation some three years later.

The Housing Crunch

It became obvious that some sort
of permanent structure would be nec-
essary to enclose the repeater.
SBARC went to tremendous effort to
build a very rugged plywood box
large enough to enclose the repeater
and dup lexer, The box was delivered
to Valley Telecom, Ino, the new busi-
ness of WB6RDV, and it is still there.
In the interim, the city had agreed to
provide a separate building for the
SBARC repeater. At some time dur-
ing this period, the WR6ANW
call sign expired and the new club
call of K&TZ/R was programmed into
the repeater.

The Naw Machine

As time took its toll on the older
equipment and more frequent repair
trips became necessary, it became
obvious that the good old root beer
box might not stand up during an
emergency. In addition, the club
wanted features such as auto patch.
A grassroots fund raising was spear-
headed by WB60BB and N6CPN and
the club ordered a new all-solid state
GE repeater. The pace picked up on
completion of the cactus control
system. The new machine arrived
and was installed in its new house,
originally without the new control
system. FCC rules had relaxed,
aliowing automatic repeater control,
and the temporary control system
was laid to rest along with the origi-
nal repeater. The cactus control sys-
tem, finally complete, was installed
along with a 440-MHz control receiver
and temporary autopatch on loan
from W6YJO. The new control sys-
tem functioned well for a time but
was damaged by a nearby lightning
strike during a storm. We are current-
ly operating under automatic control
once again.

The Future

Most of the problems with the con-
trol system have been repaired and a
new, more sophisticated autopatch

is in the design stage. The repeater
now has full battery standby power
as well as standby ac power provided
by the city generator. The new con-
trol system is expandable to fulfill
future needs, and the basic repeater
has proved to be a very reliable
machine. The SBARC repeater fund
is still attempting to recover from the
purchase of the new machine, and
future improvements will be made as
funds become available

CHRISTMAS IN THE CITY OF
THE ANGELS

I guess you all know that this
is a special time of year, Even
here in Los Angeles, most of the
major thoroughfares are alive
with holiday decorations and
the spirit of the season Is In the
air. Also, on the air. Shortly, It
will be time lor "Operation San-
ta Claus 1981 1" in which ama-
teurs from all over the area take
their portables and hand-helds
into local hospitals so that
children confined in those in-
stitutions can get their chance
to communicate with Jolly Old
St. Nick.

We have written about this
topic before. We told you how it
was started more than 20 years
ago on the old Mt, Wilson
WA6TDD repeater by W6AOP
and K6SJJ, among others, and
how this event has withstood all
forms of adversity over the
years, including some organized
jamming in recent times. No
matter what, "Operation Santa
Claus" will happen. It's become
as important a Los Angeles area
tradition as the decorations
along Wilshire Boulevard. It will
happen again this year, and it
will succeed again this year.

Most hams belong to one or
more radio clubs in their area. I
wonder how many of you have
ever thought of undertaking a
project like "Operation Santa
Ciaus." but failed to bring the
idea to the attention of the rest
of the members. True, it's a lot of
work. You can't expect to start
on Sunday with planning and be
ready to roll the following
Wednesday night. The logistics
of this kind of operation are
such that very careful consider-
ation must be given to every
detail. The obvious first step is
to make contact with the hospi-
tals in your area and simply of-
fer the concept. Since this might
be a bit of a job in itself, do give
yourself ample lead time. Right
now is a good time to plan for
next year. The hardest part will
be reaching the proper official
with the power to make a deci-

sion. You may have to work
through an Intermediary, but if
you've got the tenacity and can
be convincing enough, you will
probably get the green light. A
good argument in favor of the
project is the longevity of the
Los Angeles area operation.

Next, you must select your
operating mode. Here VHF and
FM are naturals, This is because
of the lightweight portability of
equipment and the fact that no
connection to power mains is
needed, Avoid hand-helds
unless they are equipped with
external speaker* micro phones.
Many of the kids you will visit
may not be ambulatory. As you
know, using a hand-held while
lying flat on your back is not the
easiest thing to accomplish
even for the trained operator.
Now think of trying to be station
in control for an invalid child
who has never before seen a
hand-held, if you don't have a
speaker-mike for your rig, you
might pluck that old TR-22 out of
the closet and blow off the cob-
webs. Radios like the TR-22,
TR-33, and TR-2200 are best for
this type of operation.

it's also necessary to avoid
massive equipment installa-
tions which require outdoor
antennas and connections to
the ac power mains. If your par*
ticular site dictates that you
must operate from a fixed loca-
tion using ac power, be sure that
all equipment is grounded prop-
erty using 3-wire line cords. Do
not try to cheat the system with
adapters and the like. Besides
the fact that most hospitals will
not permit this in the first place
for safety reasons, you run the
risk of personal liability if some-
one should be Injured as the re-
suit of your negligence. Remem-
ber. You may be performing a
public service, but you are still
someone else's guest and you
live by their rules.

What about Santa Claus him*
self and his North Pole home?
Where should he be located?
You play this one by ear. In Los
Angeies, a large number of hos-
pitals are visited every year. It
would be all but impossible for
Sid McCormack W6BWG, who is
our Santa, to visit each. Sid op-
erates from a centralized North
Pole and communicates over a
system of intertied repeaters to
hospitals as far to the east as
Riverside, to the west to the
ocean, and to the south half the
distance to San Diego, The lo-
gistics of the LA Operation San-

198 73 Magazine • December, 1981

ta Oaus seem to grow each
year, but each independent geo-
graphic area and involved club
will have to decide what's best
for itself.

For example, if you can only
visit one hospital, Santa can be
on site. That Is either in a vacant
room, in his mobile, or anywhere
near enough for full-quieting
simplex operation, it's Junacy to
tie up a busy repeater for an
evening if Santa and his flock
are within 3 few yards of one
another. Also, avoid uninten-
tional interference from outside.
Stay off ,52 or any other heavily
used simplex frequency in your
area. Choose some oddbail
away from the mainstream of
2-meter activity. True, you will
lose your outside audience, but
you will also avoid problems
from outside your operation.

On the other hand, if logistics
dictate the use of a repeater,
possibly because your opera-
tion is quite large in nature, then
try to find one that has a low
utilization factor. While you
might find this hard to believe,
there are some hams who will
object to having their favorite
rag chew session interrupted
for any reason. These are the
people who ratchet-mouth
through tornado and hurricane
alerts; unfortunately, we have
our share of these un-public«
spirited individuals among us. If
you have no alternative but to
use a specific system, then be
sure to publicize the event well
in advance. Make sure every

member of the club knows that
the repeater will be closed to all
but the Santa Glaus operation
and emergencies during a
specific time period. List the
operating schedule in your
newsletter and have someone
make periodic announcements
at least two weeks prior to the
event. Make sure that hams
from other repeaters and clubs
know as weli. Hot only may you
pick up some needed extra help.
but you will also avoid hurting
anyone's feelings the day of the
operation when alt on the fre-
quency must be requested to
vacate. Republication of your
operating schedule will give all a
chance to find alternate places
to operate.

If your area is plagued with
malicious Interference— if the
sick minds are out there just
waiting to give some poor sick
child a deluge of four-letter
atrocities— then do not even
consider the use of a repeater.
Even a private tone-access
system. Better you have a Santa
on the run from hospital to
hospital than demean the opera-
tion by letting some half-crazed
jerk spoil the fun for the kids in
order to get his own kicks. If the
distance between locations
makes having a Santa on the run
an impossible task, then you
might consider borrowing some*
one's remote base for operation
from "Santa Central" to the field
units. The very nature of a
remote base, i.e., simplex chan-
nel operation, tends to minimize
the kook factor. Also, even with

MM HELP

I will pay someone with ex-
ceptionally good reception to
record shortwave programs and
send me the tapes,

Owen Aid is

282 Cam I no Al Lago

Atherton CA 94025

I want a Polaroid CR*9 scope
camera with #33-10 {87 x
119 mm) hood, former Allied #s
561-3301 and 561-3310. Or, just
the CR-9 and lens, without hood.
I will pay a good price for one in
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161 Grosvenor St.
Athens OH 45701

(61 4)- 593-6207

I need an HP-2 matching unit
for the Eiectrospace H V-5 anten-
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pay any reasonable amount*

Also, I would like to hear
from any Japanese ham inter-
ested in trading Japanese
stamps for US stamps.

William H. Washburn W7UI

291 Coachman Drive

Eugene OR 97405

I am looking for a manual for a
Canadian Marconi DJ 30 and
also one for an RCA Carfone
150. Can anyone help?

Fred Nordstrom N4EHV
Rt 2, Box 26

Calvin KY 40813

a remote base, stay on some un-
inhabited simplex channel.
Most potential jammers are not
all that astute. Very few will go

out and purchase a 220-MHz or
450-MHz synthesized radio in
hope of locating your control
channel just to cause you mis-
ery. Even so, be prepared for any
eventuality, for any trouble-
maker who might come along,
Some people no longer believe
in Santa Glaus. Some of these
object to you or anyone else be-
lieving either. Need I say more?
What about your Santa? First
of all, he should have the kind of
voice and personality that kids
already associate with St. Nick:
warm, friendly, and understand-
ing. It will probably be hard to
choose from among the many
volunteers for the position. Who
wouldn't want to be "Santa for
a Day"?

Since Santa is supposed to be
live and direct from the North
Pole, some North Pole sound ef*
fects might be in order. Nothing
elaborate,., and nothing you
can't get from a Christmas
sound effects record from your
local five and ten cents store.
Transfer the sounds you need
onto endless loop cassettes and
put the player within range of
your mike. Adjust the volume to
where the background on anoth-
er radio seems real and there
you have it— instant North Pole.
Loop cassettes or, If you prefer,
endless loop cartridge tapes,
will keep you from having to re-
wind tape at an inopportune
time. Make a few different tapes
or carts. If you have the equip*
ment, you might want to edit
and re-mix sounds for greater
realism. You might even ap-
proach a local radio station for
help on this, which could bring a
side benefit of news coverage
as well A bit of good public rela-
tions for our hobby never hurts.
Also, in relation to publicizing
your event to the general public,
I suggest you read "Free PR for
Ham Radio" in the September,
1981, issue of 73. Rob Dief en-
bach WD4NEK has been very
successful in this department
and his article shares his
secrets with you.

One note from someone In the
business. If you make arrange-
ments for TV coverage, keep
that schedule to the second.
Television news is a split*
second industry and it's very
easy to get an assignment edi-
tor irate by having his crew show
up to find nobody ready or the

event completed. Blow it once.
and you might as well forget it in
the future, in news, especially
electronic journalism, that's the
name of the game.

Finally, what should Santa
say to the kids, and what should
he avoid? In most cases, the
kids will have a list of gifts they
want. Unless your club has an
unlimited treasury, there will be

no way to deliver on promises
made, so make no promises.
One of the worst things an adult
can do to kids is promise and
not deliver Let Santa respond
by saying something akin to "we
will put it on the list and see
what we can do," No hard and
fast promises. Above all, keep
conversations light, seasonal,
and filled with "ho, ho,
ho*sl\..and don't forget to ID
at prescribed intervals.

When your operation is over,
hold a critique over a cup of cof-
fee. If you are smart, you will
have recorded your ''Operation
Santa Glaus." Use these tapes
to critique the operation. Video-
tapes are even better. If you re-
ceived TV coverage, chances
are that the station probably
sent a mini-cam crew to record
the event. They probably record-
ed a lot more tape than ever
reached the air, and very quick
action (within 24 hours, before
the cassettes are bulk-erased
for reuse) might get you a dupe
of the raw or unedited shoot.

Last year's Los Angeles
"Operation Santa Ciaus" was
the biggest and best to date. It
was a delight to listen to and it
received good press coverage
from local TV, radio, and news-
papers. What about this year?
It's only a few days before I will
know the whole story on "Opera*
tion Santa Glaus 1981,"

SEASON'S GREETINGS

I hope you have enjoyed this
year's Christmas special. Next
month, it will be business as
usual We may have some in-
formation on FCC actions
against alleged (or proven) jam*
mers, and definitely will have
the last part of the SCRRBA
series on voluntary frequency
coordination for the 1980s. In
the meantime, from those of us
who write on the late shift in Los
Angeles, our warmest wishes
for a very Merry Christmas, Hap-
py Chanukah, and... as the
voice on the old WA6TDD re-
peater ID tape used to say. . .a
Happy and Preposterous New
Year, See you in 1982,

73 Magazme * December, 1981 199

MICROWAVE ANTENNAS **

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iflttliHjpbildty, 0jj tit to the »m* euctrng lUndwdt n
Sherwood

tha no-tiofnpromi** Sherwood ipeath proceanrr Contains in
out, gptfet, equiliutton control!. Compatibla with iM ngi.
Modfll SE1 Mike Equalizer (Pre ProGMeor I $10000.

Add S3 thipfMng par order: 110 OnnM iir, Euncrpiirm- PtksU OaifKl
InrjDimtHH,, Ptotlfich 24 *8, D4070. Irtgohltdt, Win GirmMiv.

Sherwood EngineEring Inc

1266 South Ogden St.

Denver, Colo. 80210

(303> 722 2257

QUALITY MICROWAVE SYSTEMS

2100 TO 2600 MHz ANTENNAS
MINIMUM 34 db GAIN OR GREATER

Complete System at pictured $14995

(ft month warranty)
Down Converter (Probe Mntd.)

assembled A tea led $59.95

Down Converter (Chassis Mind )

asiembled & tested $59,95

Power Supply, assembled A tested $49,95
Down Converter PC board,

with parts, unassembled 4 Data $39.95
Data Information (Plans) $9.95

Send cash, check
or money order to:

Phillips-Tech
Electronics

0eptSP*73 ^421
P.O. Box 33205
Phoenix.
I Arizona 85067

Far spec tat quantity

pricing, C.O.D.'s,

Mastercharge.

and VISA call:

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MORSE CODE, BAUDOT and ASCII RTTY
FOR THE TRS-80 MODELS I and III

DISASSEMBLED HANDBOOK - VOLUME 4

no RS'232C interface is required

8 to 800 WPM Morse transmit pgm
Adding type ahead capabilities
Morse receive decoding program
Merging + 12 prepared messages
Baudol transmit 60-66-75-100 WPM
Baudot receive for above speeds
Merging + 22 prepared messages
ASCII transmit program 110 Baud
ASCII receive decoding program
Merging + 22 prepared messages

$1 B | US] per copy add $2 shipping
| $4. 50 overseas airmail

— GERMAN 4 FRENCH LANGUAGE EDITIONS—

Morse, Baudol & ASCII on disks $49
^458 [Vol 4 required for instructions]

RICHCRAFT ENGINEERING LTD.
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TUBESTERS cost less than two tubes,
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«*<$*« Ust of Advertisers on page 162

73 Magazine • December, 1981 201

WFVE GONE NATIONAL

Strux Corporation manufactures and
distributes National Radio, Inc. Com-
ponents: Chokes, inductors, coils, and
hardware, We also distribute fixed and
roller inductors, contactors, mil-spec
and designer knobs. For all your elec-
tronic needs, contact Strux Corpora-
tion, 100 East Monlauk Highway,
Lindenhurst, New York 11757.

ISTRUXl

v 30

CORPORATION

100 EAST MONTAUK HIGHWAY
LINDENHURST, NEW YORK 11757

C.B. SPECIAL

(Repeat of a sell out)

CONVERT THESE TO

IOMETER FM

New Hy-Gam 40 channel pfinied circuit
boards assembly {Squelch pot. volume
control and channel switch no I included)
&oarri& sold as is. Dimension 6"X6".

1-9 pes $7.50 «i.

10-49 pes S6.50 ea,

(White quantilbss last J

REMOTE 40 CHANNEL C.B.
Remotes have a metal frame Speaker,
plastic Case, and control mic no* included.

Sold as is

$14.95 ©a

C.B. BARGAIN

CB hoards missmg parts or damaged
Can be used tor spa* e parts Buy several * I

$3.50 ea
Order inform aHoft Please add $4.00 lot
5'H wm UPS CODs accepted lor orders
loiaimg 550 00 or more. Ron da residents
add 4% sales tan Minimum order $15 00
Foreign orders US funds only add 20% lor
S/M. MASTER CARD and VISA accepted.

Surplus Electronics Corp.

7294 N ft S4insi

MlWi. F| I31IB f 69

SYNTHESIZED

SIGNAL GENERATOR

MADE IN
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MODEL
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• Covers 10Q lo 179 999 MHz in 1 kH* sieps witft
thumb- wheet dial * Accuracy 00001% at an fre-
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over 100 kHz at a 1 kHz rate • Spurs and noise at
lea si GOdB below carrier * HF output ad |u stable from
5 500m V across 50 ohms • Operates on 12vdc @
'/? amp In stock for immediate shipping $329,95
plus stripping Overnight delivery available at extra
cost • Range Extender (phase locked mixer /divid-
er) lor above unit Extends the range rrom 1 to &60
MHz, Same size as SO- 100 Mounts piggyback
Price S299.9&.

^311

VANGUARD LABS

196-23 Jamacia Av«., Mollis. NV 1 1423
Phone: (21 2} 4*6-2720

GO MOBILE WITH YOUR H.TJ

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"A unique battery eliminator"

HANDI-TEK Regulator allows constant hand he! d

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loom — slides on bottom o* radio
Yaesu — (its into battery compartment
Kenwood —powered thru battery plug

DIRECTION
FINDING?

New Technology (patent pending) con-
verts any VHF FM receiver into a modern
Doppler Radio Direction Finder. No
recervef mods required See June 1961
issue of 73 for technical description. Kits
available from $235. Write for full details
and prices,

-425 * do

1 (60:

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JUST ANOTHER 'SIMPLE" RTTV PROJECT

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Subscription
Problem?

73 Magazine does not keep subscrip-
Hon records on the premises, there*
(ore calling us only adds time and
doesn't solve the problem.

Please send a description of the
problem and your most recent ad-
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73 Magazine
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this publication
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202 73 Magazine • December, 1981

Synthesized

Hand-Held

Scanner!

Chances are the police, fire and weather
emergencies youll read about in tomor-
row's paper are coming through on a
scanner right now. All scanners sold by
Communications Electronics bring the
real live excitement of action news into
your home or car. With your scanner, you
can monitor the exciting two-way radio
conversations of police and fire depart-
ments, intelligence agencies, mobile tele-
phones, energy/oil exploration crews,
drug enforcement agencies and more.

Some scanners can even monitor aircraft
transmissions! You can actually hear the
news before it's news. If you do not own a
scanner for yourself, now's the time to buy
your new scanner from Communications
Electronics. Choose the scanner that's right
for you, then call our toihtree number to
place your order with your Master Card or
Visa. A scanner is an excellent holiday gift.

We give you excellent service because CE
distributes more scanners worldwide than
anyone else. Our warehouse facilities are
equipped to process thousands of scanner
orders every week. We also export scanners
to over 300 countries and military instat*
lations. Almost all items are in stock tor
quick shipment so if you're a person who
prefers fact to fantasy and who needs to
know what's realty happening around you,
order your scanner today from CE!

NEW! Bearcaf?350

The Ultimate Synthesized Scanner!

Afiow 30-60 days tor del/very after receipt of
order due to the high demand tor thts product
Lrst price S599.95/CE price $419,00
7-Band, SO Channel • Alpha- Hunt a He • No-
crystal scanner • AM Aircraft and Public
Service bands* • Priority Channel • AC/ DC
Bands: 30-SQt 11 8- 136 AM, 144-174,421*512 MHz.
The new Bearcat 350 introduces an Incredible
breakthrough in synthesized scanning: Al pila-
ff u me r re Display. Push a button— and the Vacuum
Fluorescent Display switches from "numeric" 10
word desenptions of what's being monitored 50
channels in 5 banks. Plus* Auto& Manual Search.
Search Direction, Limit & Count. Direct Channel
Access. Selective Scan Delay. Dual Scan Speeds.
Automatic Lockout, Automatic Squetch. Non- Volatile
Memory Reserve your Bearcat 350 todayl

Bearcat® 300

List price S549.95/CE price $339.00
7 -Band, SO Channel ■ Service Search a No-
crystal scanner a AM Aircraft and Public
Service bend** * Priority Channel • AC/ DC

Bands; 32-50. 118 136AM, t44-174,42t+Sl2 MHz
The Bearcat 300 Is the most advanced automatic
scanning radio that has ever been offered to the
public. The Bearcar 300 uses a bright green fluo-
rescent digital display, so it's ideal for mobile
applications The Bearcat 300 now has these added
features: Service Search, Display intensity Control,
Hofd Search and Resume Search keys. Separate
Band keys to permit lock- in/ Jock* out of any band for
more efficient service search

Bearcat® 250

Lisi price S429 95/CE pries 1269.00
Q-BanQ% SO Channel • Grystalless • Searches
Stores • Recall* a Digital clack • AC/DC
Priority Channel • Delay • Daunt Feature

Frequency range 32-50, 746-174, 420-512 MHz
The Bearcat 250 performs any scanning function you
could possibly want. With push button ease you can
program up to 50 channels for automatic monitoring.
Push another button and search for new frequencies.
There are no crystals to limit what you want to hear. A
special search feature of the Bearcat 250 actually
stores 64 frequencies and recalls them, one at a time,
Overseas customers should order the Bearcat 250 FB
at $379 00 each This modef has 220 V AC/12 V DC
power supply and 66-63 MHz (ow band coverage,

NEW! Bearcat® 20/20

List pnee $449 95/CE price $279.00
7- Band t 40 Channel • Cryatallesa * Sear eh ««
AM Aircraft and Public Service banda a AC/DC
Priority Channel * Direct Channel Access • Detey

Frequency range 32 -50, 118-136 AM, 144-174,420-512 MHz

The Bearcat 20/20 automatic scanning radio
replaces the Bearcat 220 and monitors 40 frequen-
cies from 7 bands, including aircraft. A two-posit ion
switch, located on the front panel, allows monitoring
of 20 channels at a time

Bearcat® 21 OXL

List price £349 95/CE price $219.00

6- Band, 18 Channel • CrymtaUesm a AC/DC

Frequency range: 32-50. 144-174, 421-512 MHz.
The Bearcat 21QXL scanning radio Is the second gener-
ation scanner that replaces the popular Bearcat 2)0
and 211, It has almost twice the scanning capacity of
the Sea rear 210 with 18 channels plus dual scanning
speeds and a bright green flu orescent display. Auto-
matic search finds new frequencies Features scan
delay, single antenna, patented track luning and more'

Bearcat® 1 60

List price $299, 95/CE price $184,00
5-Bandf fB Channel a AC only e Priority
Dual Moan Speeds * Direct Channel Access

Frequency range. 32-50, 144-174, 440-512 MHz
Would you believe... the Bearcat 160 is Ihe least
expensive Bearcat crystalless scanner.

This scanner presents a new dimension in
scanning form and function. Look at the smooth
keyboard. No buttons to punch No knobs to turn
Instead, finger- lip pads provide control of a W scanning
operations, including Qn/Qff, Volume and Squelch. Of
course the Bearcat 160 incorporates other advanced
Sea re a 1 features such as Priority, Direct Channel Access,
Dual Scan Speeds, lockout. Scan Delay and more.

NEW! Bearcat8 100

Thm firm f no- cry m tat p run ram m mbtw handheld scanner*

Allow $0-120 days tor delivery after receipt of
order due to the high demand for this product
List price S449.95/CE price $299.00
8- Band, 10 Channel a Liquid Crystei Display
Search • Limit • Hold e Lockout a AC/DC
Frequency range: 30- 5a 138-174. 406-512 MHz
The workfs first no-crystal handheld scanner has
compressed inlo a 3r * 7" * 1 W case more scanning
power than is found in many base or mobile scanners
The Bearcat 1 00 has a full 1 6 channels with frequency
coverage that includes all public servrce bands (Low,
High. UHF and T bands), the 2-Meter and 70 cm
Amateur bands, pius Military and Federal Government
frequencies. It has chrome-plated keys for functions
thai are user controlled, such as lockout manual and
automatic scan. Even search is provided, both manual
and automatic Wow ..what a scanner1

The Bearcat 1 00 produces audio power out put of 300
milliwatts, is track-tuned and has selectivity of better
than 50 dB down and sensitivity of 0.6 microvolts on
VHFand 1.0 microvolts on UHF. Power consumption is
kept extremely low by using a liquid crystal display and
exclusive low power integrated circuits

Included in our low CE price is a sturdy carrying case,
earphone, battery charger/ AC adapler, six AA nl»cad
batteries and flexible antenna For earliest delivery
from CE. reserve your Bearcat 1O0 today.

Bearcat® 5

List price $134 95/CE price $94. OO

4- Band, 8 Crystei Channels a Lockout a AC only

Frequency range 33-50* 14&-174, 450-508 MHz

The Bearcat 5 is a value-packed crystal scanner pull t for

the scanning professional — at a price the first-lime

buyer can afford. Individual lockout switches. Order one

crystal certificate tor each channel.

NEW! Bearcat® 350

Bearcat8" Four-Six ThinScan

List price S 1 89 95/CE price $1 24.00
Frequency range: 33+47. 15 2*1 €4, 450-508 MHz.
The incredible, Bearcat Four-Si* Thin 3ear*~ is like
having an information center in your pocket. This four
band. 6 channel crystal controlled scanner has patented
Track Tuning on UHF. Scan Delay and Channel Lockout.
Measures 2^ x 8V* x 1 1* Includes rubber ducky antenna.
Order crystal certificate for each channel. Made in Japan,

TEST ANY SCANNER

Test any scanner purchased from Communications
Electronics" tor 31 days before you decide to keep it J* for
any reason you are not completefy satisfied, return ft in
original condition with all parts in 31 days fc-r a prompt
refund {less ship ping/ handling charges and rebate credits).

Fanon Slimline 6-HLU

List price Si 69 95/CE price $109,00
Low cast O'channett 4-band scanner!

The Fanon Slimline 6- HLU gives you six channels of crystal
controlled excitement Unique Automatic Pea* Tuning Circuit
adjusts Ihe receiver front end for maximum sensitivity
across the entire UHF band individual channel lockout
switches. Frequency range 30-50. 146-175 and 45G-512
MHj Size 2s* x6^ x l" includes aiooer ducky antenna.
Order crystal Certificates for each channel Made in Japan

Fanon Slimline 6-HL

List price $149 95/CE price £99. OO

a-Channal pmrtormmncm at 4-channa-f coat!

Frequency rango: 30-50, 146-175 MHz

It you don't need Ihe UHF band, get Ihis model and save

money Same high performance and tea lures as the model

HLU without the UHF band Order crystal certificates for

each channel Made in Japan

OTHER SCANNERS S ACCESSORIES

MkTWt Regency4 % 081 0 Scanner S3 1 9 00

MEW! Regency* D300 Scanner . .521 9 00

HEW! Regency* 0100 Scanner . St 69 00

HaTWI Regency* H604 Scenner $129 00

Regency* M400 Scanner „'. $259 00

Regency* Ml 00 Scanner, ..,,♦♦♦ „ $199 QQ

Regency* ft! 040 Scanner... $149 00

SCMA-6 fanon Mobile Adapter/ Battery Charger. . , . £49.00

CHB-6 Fanon AC Adapter/ Battery Charger SI 5 00

CAT-ft Fanon carrying case with belt clip $15.00

AUC-3 fanon auto tighter adapter/Battery Charger $ 1 5 00
PSK-6 Base Power Supply/Bracket (or SCMA-6 . . S20.DO
SPSO Bearcat AC Adapter . ..... 19.00

SPS 1 Bearcat Battery Charger .,,,.. $9.00

SPSS Bearcat 4-6 ThinScan* carrying case $12,00

MA508 Regency carrying case for H604 $15.00

FB*E frequency Directory for Eastern USA . . ... $12,00

FB-W Frequency Directory tor Western USA ..... $1 2.00

FFD Federal Frequency Directory tor USA ....... $12.00

TSGTopSec*e1" Registry of U.S. Government Fre*V $'0,00

B-4 f .2 V AAA N'-Cad batteries (set of four* S9.00

A-I35cc Crystal certificate $300

Add S3 00 shipping for alt accessories ordered at the same tune

INCREASED PERFORMANCE ANTENNA*

If you want the utmost in performance from your
scanner, it is essential that you use an external antenna
We have six base and mobile antennas specifically
designed for receiving all bands. Order #A60 Is a
magnet mount mobile antenna Order #A61 is a gutter
dip mobile antenna. Order #A62 is a trunk-lip mobile
antenna Order #A83 is a ^ inch hole mount, Order
# A64 is a ^ inch snap-in mount and # A70 is an alt band
base station antenna. All antennas are $35. 00 and
S3 00 for UPS shipping in the continental United States.

BUY WITH CONFIDENCE

To get thatmmtomi dmtiwmry tram CcTof any scanner, send
or phone your order directly to our Scanner Distribution
Center!" Be sure I o calculate your price using the CE price a
in thm ad. Michigan residents please add 4% sales tax
Written purchase orders are accepted Irom approved gov-
ernment agencies and most weU rated firms at a 10%
surcharge for net 10 billing All sales Are subject to availa-
bility acceptance and verification. All sales on accessories
are (mat- Prices, terms and specifications are subject to
change without nolice Out oi stock Items will be placed on
backorder automatically unless CE is instructed differently.
Most products I hat we sell have a manufacturer's warranty
Free copies of warranties on these products are available
prior to purchase by writing to CE International orders are
invited with a $20,00 surcharge tor special handling in
addition to shipping charges All shipments are F.O.B. Ann
Arbor, Michigan. No COD'S please. Non-cart rued and foreign
checks require bank clearance Minimum order S35 00

Mail orders to: Communications Electron lesr
Box 1002. Ann Arbor, Michigan 48106 USA Add
$7,00 per scanner or phone product tor U.P.5.
ground sh ipping and handling, or S 1 4.00 tor faster
UPS, air shipping to some locations. If you have a
Visa or Master Card, you may call anytime and
place a credit card order. Order toll free in the
USA Dial 800*521-4414. if you are outside the
US or in Michigan, dial 313-994-4444. Dealer
inquiries invited. Order without obligation today!

Scanner Distribution Center" and CE logos are trade-
marks of Communications Electronics"
t Bearcat is a federally registered trademark of Electra
Company, a Division of Masco Corporation of Indiana
t Regency is a federally registered trademark ol Regency
Electronics Inc
Copyright' 1981 Communications Electronics"

VISA

.-377

COMMUNICATIONS
ELECTRONICS"

054 Pnoenii [} Bo* i$Q2 G Ann Arbor, Mtchtgan 40106 U S A
Call TOLL- FRE 1 1 eOO| S21 4* 1 4 Of outl'd • U 5 A { 3 13 1 »»4 ■ 444 *

We're first
with the best?

z
O

z
<
ft.

111

D
CO
UJ

I-

NTfft

CALL TOLL FREE

DAIWA CN-720B

SWR

& POWER METER

Tne cross-needle meter ndcaies Dotn torwam po*er via reflected potter on one
meter and SWR is read direct! v at tne pomt *nere me needles intersect Boot power
and 5 WR can be crocked mstantfy wrmout t>rnehconsum<ng sensitivity adjustments
— even wnen using SSB

"NAVS218 75

SPECIAL $149.95

NEW NEW

NEW

Cfc M 1 TV I P ( *

■

VsU,l»MI

SONY ICF 2001

• FM/AM/SSBA^r¥tortde spectrum coverage • Dva^converaton mpertieterodyne
circuitry of AM assures high sensitivity and interference rejection * Quartz-
crysial. phase^ockep-koop frequency synthesis for all bands assures the inmost
tuning stability, wjthout s trace of tuning drift • Direct-access, digital tuning
keyboard and LCD digital frequency readout for quick, key-touch station selec
lion— maximum accuracy and ease of use * Manual tuning and automatic scan-
ning lor effortless signal searching, easy DXmg * 6-statK>n presets, plus 2 aum<
fttfy presets . for mstanl reception of memorized nations on any band-ptas LDC
memory indtcaixm • 5-step LED signal-strength indicator • LocetSNormeJAOX
eansitrvny selector tor AM ■ SSB/CW compensaior tor tow-distonion recap-
lion * Telescopic antenna, plus external antenna included • * speaker for full.
rich sound * Slide-bar bass and treble controls » Sleep timer —with LCD
readout— can be set in io-rmnute kicremenls for up to 90 minutes of play before
automatic radio shut-off • Shoulder strap included * Integral stand allows lilt-up
desktop placement ■ Tape recorder jack allows oft-the-air recording * Might-
ftght k> LCO ■Uum.nat^ CAu FQR 0|Jft N£W LQW pR|CE

Cfl

r
m

-n

m
m

H
30
>
O

• i*i 1 1 -\ *

-*M

- n<n

' ««i>iii

i .i .

("WS H< i mv

-i i m\i in i <rni k

■■I

9W> •

JIL SX-200 Programmable Scanner

1 , Type: FM £ AM

2. Frequency Range a )2fi— 57,095
MHz Freq.Space 5kHz b) 56— 8fl MHz
Freq. Space t2_5fcHt:c} 106— 1 80 MHz
Freq Space 5 kHz; d) 380—514 MHz
Freq. Space n 5 kHz

3 Sensitivity FM a 126—180 MHz
0 4trV S'N 12dB bj380— 514 MHz i OvV
S N I2d6 AM. a)26— 180 MHz 1 QuV

s n i0dB biaeo— 514 mhz 20W S'N

10dB

4+ Selectivity: FM More man 60 dB at ~

Zb *nz AM More than 60 d0 at ^ i0

kHz

Low, Low Prices
On Apple Computers & Accessories
"interface To Your Transceiver
For RTTY Or CW"

p
b

■

5. Audio Output: 2 Watts

6. Extern a f Speaker Impedance: 4 — &
ohms

7. Power Supply: 12V DC (included)

B Antenna impedance: 50— 75 ohms

vVhjp o* EKieirm* Antenna wrth LO'OX

Control i?0 dQ ATT |

9 Frequency Stability: 26 — 1 B0

MHz. wilhirt 300 Hi 380 — 5T4

MHz within i KHz cai normal lem-

paratuwj

MAV $499 95

INTRODUCTORY SPECIAL S389 95

"Our Most Popular Scanner
the JIL SX-100 +

'NAV $399.00

16 Channels 30-54 MHz; 140180
MHz, 410-514 MHz Digital Clock
Date Display no V AC or 12-
16 V DC

Seek Rate Fast *uchvsec
Stow 5ctv sec
Bright Green 9 Digit Frequency Dis-
play Ext Anienna Jack E*1
Speaker Jack Large Top Mounting
Bracket Scan Rate Fast Bch/sec^

Slow 4ch/sec
Scan Delay Time Variable 0-4 sec

UNBELIEVABLY PRICED
ATA LOW 51 99.95

3)
O

Call for Discount Prices.

Computer

AMDEK

APPLE

ATARI

BASE 2

CENTRONICS

COMMODORE

0C HAYES

HA2ELTINE

LEEOEX

Amateur Radio

JUtAORQTRONICS

AVANTI

DRAKZ

MtRAr

MAXELL

BASH BOOKS

ETO

PANASONIC

MCBOSOFT

BEAHCAT

HUSTLER

SHUR£

MOUNTAIN HARDWARE

0ENCHER

HY^GAIN

TEMPO

NEC

CALL BOOK

ICOM

TELEX

NORTHSTAR

CUSHCRAFT

KANTRONICS

TRAC

PANASONIC

DAIWA

KENWOOD

YAESU

SANYO

DENTBON

;

SYNCOM

Call For The Many Unadvertised Specials

O CHANGE AND AVAILABILITY "ft iTirfTll II

UObi WE TRADE

WE EXPORT

37
5

ASTt^NAS

'Nationally Advertised Value

1840 "O" Street Lincoln, Nebraska 68508
In Nebraska Call (402) 476-7331

VISA

204 73 Magazine • December, 1981

■

CIRCUIT BOARDS"

* INTRODUCING THE HOWARD/COLEMAN TVRO CIRCUIT BOARDS

( Satellite Receiver Boards )

DUAL CONVERSION BOARD $25.00

This board provides conversion from the 3,7-4.2 band first to 900 MHz
where gain and bandpass filtering are provided and, second, to 70 MHz.
The board contains both local oscillators* one fixed and the other
variable, and the second mixer. Construction is greatly simplified
by the use of Hybrid IC amplifiers for the gain stages.

47pF CHIP CAPACITORS ..,-.... -.: :, ....• 6-00

For use with dual conversion board. Consists of six 47pf.

70 MHZ IF BOARD 25,00

This circuit provides about 43dB gain with 50 ohm input and output
impedance. It is designed to drive the HOWARD/COLEMAN TVRO Demodulator.
The on- board band pass filter can be tuned for bandwidths between 20 and
35 MHz with a passband ripple of less than % dB. Hybrid IC's are used
for the gain stages.

.01 pF CHIP CAPACITORS . . ...,..- 7.00

For use with the 70 MHz IF Board. Consists of seven .01 pf.

DEMODULATOR BOARD 40.00

This circuit takes the 70 MHz center frequency satellite TV signals in
the 10 to 200 millivolt range, detects them using a phase locked loop,
deemphasizes and filters the result and amplifies the result to produce
standard NTSC video. Other outputs include the audio subcarrier, a DC
voltage proportional to the strength of the 70 MHz signal, and AFC
voltage centered at about 2 volts DC.

SINGLE AUDIO

■ * •- » m

15,00

This circuit recovers the audio signals from the 6,8 MHz frequency. The
Miller 9051 coils are tuned to pass the 6.8 MHz subcarrier and the Miller
9052 coil tunes for recovery of the audio.

DUAL AUDIO 25.00

Duplicate of the single audio but also covers the 6.2 range.

DC CONTROL 15.00

SPECIAL SET OF FIVE BOARDS INCLUDING DUAL AUDIO {two single audio

boards ) 1 Ml 1 ! J !!!!!!! M !!!!!!<!!!! M 1 !!!!!>! 1 •!! H ■■!!!!!>!!!!!! 1 !!!! 100. 00

ALL PARTS AVAILABLE IN STOCK

Toll Free Number

ZZEZr' J>lcHz electroqics

(For orders only) ^^*

73 Magazine • December, 1981 205

"DOWN CONVERTERS"

1900 to 2500 MHZ Microwave Downconverters

In Regards to your request for information concerning our microwave receiver. This
receiver is tunable over a range of 1900 to 2500 MHZ approximately, and is intended
for amateur use. The local oscillator is voltage controlled (i.e.) making the I.F.
range approximately 54 to 88 MHZ For Your Standard TV Set Channels 2 thru 7.

P. C. Board with Data

1 to 5

$15.00

6 to 11

$13.00

12 to 26

$11.00

P. C. Board with all chip caps solder on.

P. C. Board with all parts for assembly.

P. C. Board with all parts for assembly plus 2N6603

P. C. Board assembled and Tested.

P. C. Board assembled and Tested with 2N6603.

HMR II Downconverter with power supply , antenna (Dish) and all Cable for
Instalation.180 Day Warranty .

1 to 5 $150.00 5 to 11 $140.00 12 to up

$125.00

Yagi Downconverter with Power Supply , Antenna (Yagi) and all cables for
Instalation. 90 Day Warranty.

1 to 5

$150.00

6 to 11

$140.00 12

$125.00

Yagi Downconverter as above but Kit. (NO CABLES) With Box.

1 to 5 $125.00 6 to 11

$115.00 12

$100.00

HMR II Downconverter as above but Kit. (NO CABLES) With PVC.

1 to 5

$125.00 6 to 11

$115.00 12

$100.00

$9.00
$30.00

$49
$69
$69

$79

99
99

Special New Stock Of Carbide Drill Bits

1 . 25mm
1.45mm
3.2mm

3.3HIT1

1/8
3/16
5/32
7/32

13/64
19

20
24
26
29
30
31
36
37

38
39

40
44
45
46
47
48
49
50
51
52

53
54
55
56
57
58
59
60

63
64
65
67

68
69

Your Choice $1.99

Toll Free Number
800-528-0180
(For orders only)

o^i(^j electronics

206 73 Magazine • December, 1981

FILTERS"

Collins Mechanical Filter #526-9724-010 Model F455Z32F
455KHZ at 3.2KHZ Wide.

$15.00

Atlas Crystal Filters

5.52-2.7/8 5.52MHz/2.7KHz wide 8 pole

5.595MHz/2.7KHz wide 8 pole upper sideband
5.595MHz/. 500KHz wide 4 pole CW
5.595MHz/2.7KHz wide 8 pole lower sideband
5.595MHz/2.7KHz wide 8 pole upper sideband
5.645MHz/2.7KHz wide 8 pole
9.0MHz/ 8 pole sideband and CW

5.595-2.7/8/U

5.595-.500/4/CW

5.595-2.7/LSB

5.595-2.7/USB

5.645-2.7/8

9.0SB/CW

Your Choice
$12,99

Kokusai Electric Co. Mechanical Filter #MF-455-ZL-21H

455KHz at Center Frequency of 453. 5Kc Carrier Frequency of 455Kc 2.36Kc Bandwidth

$15.00

Crystal Fi

titers

Nikko

FX-07800C

TEW

FEC-103-2

Tyco/CD

001019880

Motorola

4884863B01

PTI

5350C

PTI

5426C

A10300

7.8MHz

10.6935

10.7MHz 2 pole l5KHz Bw. Motorola #48D84396K01

Thru #48D84396K05

11.7MHz 2 pole 15KHz Bandwidth

12MHz 2 pole 15KHz Bandwidth

21.4MHz 2 pole 15KHz Bandwidth

45MHz 2 pole 15KHz Bandwidth (For Motorola

Communications equipment)

10.00
10.00

4.00
5.00
5.00
5.00

5.00

Ceramic Filters

Murata

BFB455B

455KHZ

CFM455E

455KHz +-

5.5KHz

CFM455D

455KHz +-

7 KHz

CFR455E

455KHz +-

5.5KHz

CFU455E

455KHZ +-

1.5KHz

CFU455G

455KHZ +-

lKHz

CFW455D

455KHZ +-

lKHz

CFW455R

455KHZ +-

3KHz

SFB4550

455KHZ

SFE10.7

10.7MHz

SFG10.7MA

10.7MHz

Clevite

T0-01A

455KHz

T0-02A

455KHz

Nippon

LF-B4/CFU455I

455KHz +-

lKHz

LF-B6/CFU455H

455KHz +-

lKHz

LF-C18

455KHz

Tokin

CF455A/BFU455K

455KHz +-

2KHz

Matsushira

EFC-L455K

455KHZ

R0TR0N MUFFIN FANS Model Mark

4/MU2A1

$ 2.40
6.65
6.65
8.00
2.90
2.90
2.90
4.35
2.40
2.67
10.00
5.00
5.00
5.80
5.80

10.00
4.80

7.00

These fans are new factory boxed 115vac at 14watts 50/60cps
CFM is 88 at 50cps and 105 at 60cps.

Impedance Protected-F

$ 7.99

SPECTRA PHYSICS INC. Model 088 HeNe Laser Tubes.

Power output 1.6mw. Beam Dia. .75mm. Beam Dir.

68K ohm lwatt ballast lOOOvdc +-I00vdc 3.7ma.

2.7mr. 8Kv starting voltage

TUBES ARE NEW $59.99

73 Magazine • December, 1981 207

"AMPLIFIERS"

AVANTEK LOW NOISE AMPLIFIERS

Models

Frequency Range

Noise Figure

Voltage

Gain

Power Output

Price

UTC2-102M

30 to 200MC

1.5dB

+15vdc

29dB

ldB Gain +7dBm

$49.99

AP-20-T

200 to 400MC

6.5dB

+24vdc

30d8

ldB Gain +20dBm

$49.99

AL-45-Q-l

450 to 800MC

7dB

-6vdc @ +12vdc

30dB

ldB Gain -5dBm

$49.99

AK-1000M

500 to 1000MC

2.5dB

+12vdc <? -12vdc

25dB

ldB Gain +8dBm

$69.99

Mini Circuits Double Balanced Mixers

Model RAY -3

Very High Level (+23dBm LO) 70KHz to 200MHz L0,RF,DC to 200MHz IF

Conversion Loss.dB One Octave From Band Edge 6Typ./7.5Max. Total Range 6.5Typ./8Max.

Isolation.dB Lower Band Edge To One Decade Higher (LO-RF/LO-IF) 55Typ./45Min. Mid. Range

(LO-RF/LO-IF) 40Typ./30Min. Upper Band Edge To One Octave Lower (LO-RF/LO-IF) 30Typ./

25Min.

Price $24.99

Model TSM-3

Standard Level (+7dBm LO) .1MHz to 400MHz LO.RF.DC to 400MHz IF

Conversion Loss.dB One Octave From Band Edge 5.3Typ./7.5Max. Total Range 6.5Typ./8.5Max.

Isolation.dB Lower Band Edge To One Decade Higher (LO-RF/LO-IF) 60Typ./50Min. Mid. Range

(LO-RF/LO-IF) 50Typ./35Min. Upper Band Edge To One Octave Lower (LO-RF/LO-IF) 35TYP./

25Min.

Price $11.99

Hewlett Packard Linear Power Microwave RF Transistor HXTR5401/35831E

Collector Base Brakedown Voltage at Ic=100ua
Collector Emitter Brakedown Voltage at Ic=500ua
Collector Cutoff Current at Vcb=15v
Forward Current Transfer Ratio at Vce=15v,IcB15ma
Transducer Power Gain at Vce=18v,Ice=60ma,F=2GHz.
Maximum Available Gain at Vce=18v,Ic=60ma,F=lGHz/F=2GHz
Price $29.99

35volts min.
30volts min.

lOOua max.
15min,40typ«125max
3dBmin,4dBtyp
14dB typ,8dB typ

Motorola RF Power Amplifier Modules

Model

Frequency Range
Vol tage
Output Power
Minimum Gain
Harmonics
RF Input Power

Price

MHH612A

146 to 147MHz

12.5vdc

20watts

20dB

-30dB

400mw

$57.50

MHW613A

150 to 174MHz

12.5vdc

30watts

20dB

-30dB

500mw

$59.80

MHW710

400 to 512MHz

12.5vdc

13watts

19.4dB

40dB

250mw

$57.50

MHH720

400 to 470MHz

12 . 5vdc

20watts

2 ldB

40dB

250mw

$69.00

Toll Free Number

800-528-0180
(For orders only)

(fJW^ljjz elect roityes

208 73 Magazine • December, 1981

TRANSISTORS"

WATKINS JOHNSON WJ-M62 3.7 to 4.2GHz Communication Band Double Balanced Mixer

$100.00

SSB Conversion Loss 4.9dB Typ.

5.5dB Typ.

SSB Noise Fiqure

6dB Max. fR 3.7 to 4.2GHz
6.5dB Max. fl DC to 1125MHz fL fR

fl 880MHz fL fR
fR 3.7 to 4.2GHz

Isolation
fL at
fL at

4.9dB Typ.
5.5dB Typ.

6dB Max.
6.5dB Max.

R 30dB

I 25dB

20dB

15dB

Conversion Compression

Flatness

Min.
Min.
Min.
Min.
ldB

40dB
30dB
30dB
25dB
Max.

Typ.

Typ.
Typ.
Typ.

fl 30 to 1125MHz fL fR
fl 880MHz fL fR

fL 2,8 to 5.35GHz
fL 4.5 to 5.35GHz
fL 3.6 to 4.5GHz
fL 2.8 to 3.6GHz
fR Level +2dBm

.2dB Peak to Peak Over any 40MHz Segment of fR=3.7 to 4.2GHz

Third Order Input Intercept +lldBm

fRl=4GHz fR2=4.01GHz Both at -5dBm fL=4.5GHz

Group
VSWR

Time Delay .5ns Typ. .75ns Max. fR3.7 to 4.2GHz fL 3480MHz

@ +13dBm

L-Port
R-Port

I-Port

1.25:1 Typ. 2.0:1

1.25:1 Typ. 2.0:

1.4 :1 Typ. 2.0:

1.5:1 Typ. 2.0:

1.3 :1 Typ. 2.0:

1.8 :1 Typ. 2.5:

fL 2.8 to 5.35GHz
fR 3.7 to 4.2GHz fL
fR 3.7 to 4.2GHz fL
fI=100MHz
fI=500MHz
fI=1125MHz

fR
fR

SGS/ATES RF Transistors

Motorola RF Transistor

Type.

BFQ85

BFW92

MRF901

2N6603

Collector Base V

20v

25v

Collector Emitter

V 15v

15v

Emitter Base V

2.5v

Collector Current

40ma

25ma

30md

30ma

Power Dissipation

200mw

190mw

375mw

400mw

HFE

40min. 200max.

20min. 150max.

30?nin. 200max.

30min. 200max.

4GHZ min. 5GHz

max

.1.6GHz Typ.

4.5GHz typ.

2GHz min.

Noise Fiqure

1GHz 3dB Max.

500MHz 4dB Typ.

1GHz 2dB Typ.

2GHz 2.9dB Typ.

Price

$1.50

$2.00

$10.00

National Semiconductor Variable Vol

tag

e Regulator Sale

1 1 1 I 1 ! 1 1 I

* — •#*■* pa

LM317K

LM350K

LM723G/L

LM7 80 5/ 06/ 08/ 12/ 15/ 18/ 24

1.2 to 37vdc

1.2 to 33vdc

2 to 37vdc

5, 6, 8,12,

,15,18,24vdc

1.5Amps

3 Amps

150ma.

lAmp

TO-3

TO- 3

TO-100/TO-116

T0-220/T0-3

$4.50

$5.75

$1.00 $1.25

$1.17 $2.00

P & B Solid State Relays Type ECT1DB72

*May Be Other Brand Equivalent

Toll Free Number

800-528-01 80

(For orders only)

5VDC Turn On 120VAC Contact 7 Amps

20Amps on 10"xl0"x.062" Alum. Heats ink with
Silicon Grease $5.00

(fVf <7{z elect roqicf.

73 Magazine • December, 1981 209

"MIXERS"

WATKINS JOHNSON WJ-M6 Double Balanced Mixer

LO and RF 0.2 to 300MHz
Conversion Loss (SSB)

Noise Figure (SSB)

Conversion Compression

IF DC to 300MHz
6.5dB Max. 1 to 50MHz
8.5dB Max. .2 to 300MHz
same as above
8.5dB Max. 50 to 300MHz
.3dB Typ.

$21.00

WITH DATA SHEET

NEC (NIPPON ELECTRIC CO. LTD. NE57835/2SC2150 Microwave Transistor

NF Min F=2GHz
F=3GHz
F=4GHz

dB 2.4 Typ.
dB 3.4 Typ.
dB 4.3 Typ.

MAG F=2GHZ

dB 12 Typ.

F=3GHz

dB 9 Typ.

F=4GHz

dB 6.5 Typ.

S5.30

Ft Gain Bandwidth Product at Vce=8v, Ic=10ma. GHz 4 Min. 6 Typ.
Vcbo 25v Vceo llv Vebo 3v Ic 50ma. Pt. 250mw

UNELCO RF Power and Linear Amplifier Capacitors

These are the famous capacitors used by all the RF Power and Linear Amplifier manufacutures
and described in the Motorola RF Data Book.

lOpf
13pf
I4pf
20pf

22pf
25pf
27 pf
27.5pf

30pf
32pf
33pf
34pf

40pf
43pf
62pf
80pf

lOOpf

120pf
180pf
200pf

250pf 1 to lOpcs. .604 each

820pf 11 to 50pcs. . 50<f each

51 to lOOpcs. .404 each

NIPPON ELECTRIC COMPANY TUNNEL DIODES

Peak Pt, Current ma. Ip

Valley Pt. Current ma* Iv

Peak Pt. Voltage mv. Vp

Projected Peak Pt. Voltage mv. Vpp Vf=Ip

Series Res. Ohms rS

Terminal Cap. pf* Ct

Valley Pt. Voltage mv, VV

MODEL 1S2199
9ifiin. lOTyp. Umax,
l,2Typ, l.Smax,
95Typ. 120max.
480min, 550Typ. 630max
2.5Typ* 4max.
1.7Typ. 2max.
370Typ.

1S2200 $7*50
9min. lOTyp. Umax.
!.2Typ, L5max.
75Typ. 90max.
440min. 520Typ. BOOmax
2Typ. 3max-
5Typ, 8max,
350Typ.

FAIRCHILD / DUMONT Oscilloscope Probes Model 4290B

Input Impedance 10 meg., Input Capacity 6*5 to 12pf.» Division Ration (VoKs/Div Factor)

10:1, Cable Length 4Ft- , Frequency Range Over 100MHz.

These Probes will work on all Tektronix, Hewlett Packard, and other Oscilloscopes.

PRICE $45.00

MOTOROLA RF DATA BOOK

List all Motorola RF Transistors / RF Power Amplifiers, Varactor Diodes and much much
more.

PRICE $7.50

Toll Free Number

800-528-0180

(For orders only)

o)M^z elect roqics

210 73 Magazine • December, 1981

"SOCKETS AND CHIMNEYS"

EIMAC TUBE SOCKETS AND CHIMNEYS

SK110

Socket

$ POR

SK406

Chimney

35.00

SK416

Ch i mney

22.00

SK500

Socket

330.00

SK506

Ch i mney

47.00

SK600

Socket

39.50

SK602

Socket

56.00

SK606

Chimney

8.80

SK607

Socket

43.00

SK610

Socket

44.00

SK620

Socket

45.00

SK620A

Socket

50.50

JOHNSON

TUBE SOCKETS

124-115-2/SK620A Socket

$ 30.00

124-116/SK630A Socket

40.00

SK626

Chimney

SK630

Socket

SK636B

Ch i mney

SK640

Socket

SK646

Chimney

SK711A

Socket

SK740

Socket

SK770

Socket

SK800A

Socket

SK806

Chimney

SK900

Socket

SK906

Chimney

$ 7.70
45.00
26.40
27 . 50
55.00

192.50
66.00
66.00

150.00
30.80

253.00
44.00

124-113 Bypass Cap.
122-0275-001 Socket
(For 4-250A,4-400A,3-400Z,
3-500Z)

$ 10.00

10.00

2/$15.00

CHIP CAPACITORS

.8pf

Ipf

l.lpf

1.4pf

1.5pf

1.8pf

2.2pf

2.7pf

3.3pf

3.6pf

3.9pf

4.7pf

5.6pf

6.8pf

8.2pf

lOpf
12pf

15pf
18pf

PRICES:

I to 10 -

II to 50 •
51 to 100

22pf
24pf

27pf
33pf
39pf
47 pf

51pf
56pf

68pf
82pf

,99*
.90*
.80*

lOOpf*

HOpf

120pf

130pf

150pf

160pf

180pf

200pf

220pf*

240pf

270pf

300pf

330pf

360pf

390pf

430pf

470pf

510pf

560pf

620pf

680pf

820pf

lOOOpf/.OOluf*

I800pf/.00l8uf

2700pf/.0027uf

10,000pf/.01uf

12,000pf/.012uf

15,000pf/.015uf

18,000pf/.018uf

101 to 1000 .60*
1001 & UP .35*

* IS A SPECIAL PRICE: 10 for $7.50

100 for $65.00
1000 for $350.00

WATKINS JOHNSON WJ-V907: Voltage Controlled Microwave Oscillator

$110.00

Frequency range 3.6 to 4.2GHz, Power ouput, Min. lOdBm typical, 8dBm Guaranteed.
Spurious output suppression Harmonic (nf0), min. 20dB typical, In-Band Non-Harmonic, min.
60dB typical, Residual FM, pk to pk, Max. 5KHz, pushing factor, Max. 8KHz/V, Pulling figure
(1.5:1 VSWR), Max. 60MHz, Tuning voltage range +1 to +15volts, Tuning current, Max. -0.1mA,
modulation sensitivity range, Max. 120 to 30MHz/V, Input capacitance, Max. lOOpf, Oscillator
Bias +15 +-0.05 volts @ 55mA, Max.

Toll Free Number
800-528-0180
(For orders only)

(^/iGt\z electroqic$

73 Magazine • December, 1981 21 1

"TUBES"

TUBES

2E26

2K28

3B28

3-500Z

3-1000Z/8164

3CX1000A/8283

3X2500A3

4-65A/8165

4-125A/4D21

4-250A/5D22

4-400A/8438

4-400C/6775

4-1000A/8166

4CS250R

4X150A/7034

4X150D/7035

4X150G

4X2 SOB

4CX250B/7203

4CX250F/7204

4CX250FG/8621

4CX250K/8245

4CX250R/7580W

4CX300A

4CX35DA/8321

4CX350FJ/8904

4X500A

4CX600J
4CX1000A/8168
4CX1500B/8660
4CX3000A/8169

4CX5000A/8170

4CX10000D/8171

4CX150O0A/8281

4E27/A/5-123A/B

4PR60A

4PR60B/8252

KT88

DX362

DX415

572B/T160L

811

811A

812A

813

4624

4665

5551A

5563A

5675

PRICE

$ 4

100

102

300

200

300

40
50

100

300

400

500

700

100

175

100

350

100

.69
.00
.00
.00
.00
.00
.00
.00
.00
.00

.00

.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
,00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00
.00

.00

TUBES

PRICE

TUBES

PRICE

5721

$200.00

8462

$100.00

5768

85.00

8505A

73.50

5836

100.00

8533W

92.00

5837

100 . 00

8560A

55.00

5861/EC55

110.00

8560AS

57.00

5876A

15.00

8608

34.00

5881/6L6

5.00

8624

67.20

5894/A

45.00

8637

38.00

5894B

55.00

8647

123.00

6080

10.00

87 37/ 5894 B

55.10

6083/AX9909

89.00

8807

1000.00

6098/ 6AK6

14.00

8873

260.00

6115/A

100.00

8874

260 . 00

6146

6.00

8875

260.00

6146A

6.50

8877

533.00

6146B/8298A

7.50

8908

12.00

6146W

14.00

8916

1500.00

6159

11.00

8930/X651Z

45.00

6161

*■ *"S rt i

70.00
125.00

8950

10.00

6291

6293

20.00

6BK4C

5.00

6360

4.00

6DQ5

4.00

6524

53.00

6FW5

5.00

6550

7.00

6GE5

5.00

6562/6794A

25.00

6G05

5.00

6693

110.00

6HS5

5.00

6816

58.00

6JB5/6HE5

5.00

6832

22.00

6JB6A

5.00

6883/8032A/8552

7.00

6JM6

5.00

6884

46.00

6JN6

5.00

6897

110.00

6JS6B

5.00

6900

35.00

60T6A

5.00

6907

55.00

6KD6

5.00

6939

15.00

6K66/EL505

5.50

7094

75.00

6KM6

5.00

7117

17.00

6KN6

5.00

7211

60.00

6LF6

6.00

7289/3CX100A5

34.00

6LQ6

6.00

7360

11.00

6LU8

5.00

7377

67.00

6LX6

5.00

7486

75.00

6ME6

5.00

7650

250.00

12JB6A

6.00

7843

■■S rt v™ r\

58.00

"WE ARE ALSO

LOOKING FOI

7868
7984

4.00
12.00

TUBES NEW/ US ED ECT."

8072

55.00

WE BUY SELL

OR TRADE

8121

50.00

8122

85.00

8236

30.00

8295/PL172

300.00

NOTICE ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE !!!!!! ! ! !!!!!!!! M !!!>!!!!!!! ! ! ! ! ! ! !

Toll Free Number
600-528-0180
(For orders only)

J\f*^z elect rof|ic$

212 73 Magazine • December, 1981

"MICROWAVE COMPONENTS"

AIL
ML
AIL
AIL
AIL
ARM

ARM
AHSA

Alfred
Alfred
Alfred

Aatrtccn
Americon
Qoonton

Coatial Dynamics
Coaxial Dynamics
FXRyMierolab
flA/MicroUfc
ftA/Microlao
FW/Hlcn>>*6
FIR/Mlcrolab
FIB/MicroHb
General Microwave
General Microwave
General Mkrowave
Hewlett Pfl^tard
Hewlett Pacta rd
Hewlett P«t*^
Hewlett Htk*r4
Hewlett Packard
Hewlett P*ci*rd
Hewlett Packard
Hewrett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Pacta rd
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard

newlwtt
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett
Hewlett

Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard

Hewlett Packard
Hewlett Packard
Hewlett Packard
Hewlett Packard

Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Packard
Hewlett Packard
Hewlett Packard
Hewlett' Packard

Hewlett
Hewlett
Hewlett

Hewlett
ilett
rleti
Hewlett
Hewlett
ilett

Hewl ett

Hewlett

K*j

Ujr

Ray

Uctroelc

ML
ICI

HerrlMC

Microtech

miliary

Military

herd*

Hard*

Packard
Packard
Packard
Packard
Packard

narda
iuma
PUrta
Hardt
Hard*
Plardi
Narda
Narda

70A

70J0

0/050

07051

07091

UI520A

24 16-20

3*14-601

4684-20C

U51
1152
1153
2000-6254

2020- s&oo

H-4B

3Q23

3025

C*-A2l

IT-A19

S1MA

M14A

60IA07

G&J1B

K402A-3

NH0-20

4276-3

G2S1A.

H2B1A

*2B1A

HX292A

3458

6J47A

KJ47A

S347A

K347A

349ft

35SC

36QD

G3B2A

J382A

P382A

I38ZA

4UA-210

H42XA

«42JA

H424A

477E

G485A

J4B5B
JftflfiA

H487B

P487&
1487 A
148*8

H532A

J532A

M532A

P532A

X532A

538A

GT520

IT52A

175K

1752U

7670

7370

G9108

X9146

2830A

3503

111 3 1A

8435A

W71A

8472A

8732A

8H3A

SOiOOB

10855*

J1660A

U693A

13510

33001C

J3I02A

C?9~336fl2A

3909BA

JO- 0/4 320

MM7B1

7KIA

792 1A1

503*

90LH26-1

715- 1SZ

ALN26A/

214972

AT^68/UPH

UG-52B/U

70S

792FK

2361-20

2301-30

2366

2863

2864

2979

30QZ-I0

3OOZ-20

3003-10

3003-30

3004-10

to 6Qiz
to I2,4Gttz
5 to 1GHz 6dB

5 to LOHf 10*
LOw
lOw
to UBfr
0 to 50dB
0 to 5048
0 to 50dB

3 95 to S.SSGc
5.H5 to S.ZGc
12.4 to 1B&C

HlLHUHAVt: i&vaNim$

BoTse- Source-

floue Source .1 to 2.6GHJ

Noise Source

Noise Source 7.05 to JOGH;

Hon* Source 12.1 to IBGHj

Vjt i«ble Attenuator

Viable AUenultor 0-2048

Variable Attenuator 0-6048 1 to 2wHf

VtHlmlv Attenuator D-204B 3 to 49*2

tarnble Attenuator 0-20dB 7

Saacler Attenuator L to 20M*

Sampler Attenuator 2 to 4GW*

Sampler Attenuator 4

Adapter X to SNA 8.2

Directional Coupler

Power DetecLor

Directional po^r Detector 6&wfwd/15wr**/225-400im.

Directional Power Detector 60wfwdr 1^^1)6- |SQk

Coupler

Crystal Detector

Variable Attenuator D-50dB 2.6 to J, 95011*

■-equentj Htter 3.95 to 11GHz

Adapter

Adapt***

Power Lie tec tor

Directional Coupler 1 to a GHz ZGdB

100:1 Divider IMC to 250HC

tuimtt G to H 3.95 to 5.850c

Adapter h to n 7.05 to 100c

Adapter i to n 8.2 to 12.40c

Adapter 10 to lS€c

Adapter IS to 22fic

Hoiw Source If W60tlc

Moite Sowrce 3 95 to l.tSfir

Hoise Somixo 7,05 to IDSc

Hoiie Source 2.6 to 3- 950c

Noise Source B.2 to 12.40c

Noise 5Durct iOOMc to 40c

friable Attenuator .5m DC to iGc

Low Pas? Filter 4100Hc

Variable Attenuator 0 to 50dB

Variable Attenuator 0 to SOdB

Variable Attenuator D to SOdB

VirU&le Attenuator 0 to 50e£ S.2 to I2-4Gc

N tee For HI*

Crystal Detector 7. 05 to lOGc

CfysUl Detector 7.05 to tOGc Natciied Pair

Crystal Detectot 7.05 to lOGt Hitched Pair

Tnermiitar Mount For 430 Series lOHc to 100c

Barretter Mount 1,9ft to 5,850c

Detector Mourit 5.B5 to o>2Gc

Thermistor Mount 5.85 to B*26c

ThenBistor Mount 7,01 to IQGc

THenrtitor Mount IB to ?Wc

ThenrHtor Mount 12.4 to IBGc

Thervtttor Mount 8.2 te I2.4fic

Thermistor Mount S.2 to :Z.*Gc

Frequency Meter- 3. 95 to 5.flS£c

Frequency Meter 7.05 to lOGc

Frequency Meter £.3 to H.20c

frequency Meter ID to 150c

Frequency Meter 12.4 to loGc

Frequency Meter fi.2 to (2.46c

Frequency Meter .94 to 4.20c

Directional Coupler 2Qdfr 3.95 to 5.850*

Directional Coupler 3dfl 8.2 to !2,«Gc

Directional Coupler 10M 8.2 to 12,46c

Directional Coupler 20dB B.Z to i2.*Cc

Dual Directional Coupler .94 to 1.9750c 20dfl

Dual Directional Cooler 1 9 to *Gc MdB

01rection#l Detector 1.9 to 4.]Qc

Termination 3.95 to 5.850c

Moving Load S.2 to LZ.46c

Sensor Oscillator

Microwave Switch 500mc to 12.4f*c SP5T

Bandpass Filter 1 to 40c

8andoass Filter 8 to 12 *Gc

KF Detector

Crystal Detector .01 to 180c

Pin Modulator 1,6 to 4,50c EOafi

Pin Modulator J. 7 to fl.JGc ISdB

Termination 50 ohms

Preamp- ? to IJOGWc

Tr1cJHno One n tor Shunt

Lfarfttr

Tr'anaistor leit Jio

Pin ftb&orptlvp Modulator

Microwave Switch IDOMc to 1SGH4

Microwave Switch DC to 180c 5PW

Microwave Switch

0 to I0ld8 Variable Attenuator DC to lfic

Mofse Source

Noise Source 10 to 9QQMc

Noise Source 10 to lOOONc

Tube Mtg,/ Attenuator and 2K25

X Band Load

Directional Coupler 4 to BGc 20db (Narda 3044BZ0)

801152 Variable Attenuator

Microwave Switch

Horn Antenna B.S to 9.60t

5dB Attenuator

Variable Attenuator Q to 4041

rariab]e Attenuator 2 te 2.50c 0 to l7dfi win,

2.5 to 12.46c 0 to 2048 win.

Directional Coupler 2 to *Oc ZOdB

Directional Coupler I to *Oc 30d8

Variable Directional Coupler 1.2 to 1.40c 7 to I2d8

Bidirectional Coupler 4 to BGc 20dB
Directional Coupler .95 to 20c 10dB
Directional Coupler +95 to 20c 20dB
Directional Coupler 2 to 40c 108B
Olrectlonal Coupler 2 to *fic 30dB
Oirectlonal Coupler 4 to 100c lOdi

1 100 00

100,00

100. 00

150.00

?00.00

100.00

50.00

50,00

75.00

200.00

200 00

200.00

75.00

50.00

10.00

35.00

35,00

450.00

35.00

100,00

75,00

35,00

50. OD

75-00

200.00

250,00

250.00

325.00

250.00

200.00

150.00

50.00

500.00

350.00

325.00

35.00

50.00

200.00

400.00

75,00

85. DO
ISO. 00

50.00
135.^
155.00

65,00
.00
.00
500.00
400,00
500.00
400.00
350.00
600.00
200.00
200.00
200.00
200.00

50,00

50.00
200.00

75.00
100. 00

50.00
100. oo
200.00
200,00

75,00
100.00
400.00
350.00

2500
200.00

50.00
300,00
150,00
200,00
100,00

75.00

100.00

100. 00

250.00

200.00

250 00

50. DO

50.00

100,00

75.00

50 00

25.00

35.00

10O. 00

250-00

100.00

100. DO

90.00

100.00
100.00
100,00
100.00
100,00
100.00

73 Magazine ■ December, 1981 213

TEST EQUIPMENT"

Z02J

TEST EQWPHEKT

450.00

Kirda

MICROWAVE COMPOKtNTS
3004-20 Directional Coupler 4 to lOGc 20di

Boon ton

JW FH Signal fieneriLor 195 to 2?0MHi

100,00

Boonton

2OZJ/20TH

AH FM SlgnaJ Generator and Unlwerter

Hirdi

3032

Hybrid .95 to 20c 3dB

150,00

LOOKHi to 55Mc and 195 to 270Hc

600.00

Naroa

J033

Hybrid 2 to 4Gc 3dB

150.00

CMC

931

Heterodyne Converter 200 to l200*t

200.00

PHrda

3039-20

Directional Coupler 125 to ZSONc 2006

150.00

QftSftpHI

MCM5

Hani tor

750.00

iarda

3040-20

Direct tonal Coupler 240 to SOOPat 20dB

175.00

Alfred

aooo/?05i

Sweep Hpetworft Analyzer LOOehj to 40Gc

800.00

Htrda

3043-20

Olrectional Coupler 2 to 40c 7041

100,00

RofHTS

MSG-22S2*

Standard Signal Generator For 01

210.00

iarda

1044-20

Directional Coupler a to 86c 20dt

100.00

Oertscti

FrO

frequency Meter 20 to lOOOMc

150,00

Naroa

30U8Z0

Directional Coupler 3.7 to S.JGc 20O8

150,00

Syjtnon Dormer

1037/ 129 1A

Frequency meter 0 to 5Wt with P1<*o Jn

to SOGPte

500.00

Kama

3O45C30

Directional Coupler 7 to 12.40c 30oB

125,00

Slnoer

SPA3/25A

Spectrum Analyier lite to 25Me and * G-6 Cimpanion

Karda

4035

Hybrid 3d|

150.00

Sweep Generator 0 tn ISHt and PS- 3 9 Power Supply

1500,00

Narda

22006/

3043-20 Directional Coupler U to 4Gc

2048

100. 00

Measurements

Standard Signal Gen era tar 7hHi to 35Mc

250.00

Narda

22007/

3043-30 Directional Coupler 1.7 to 4Gc

1MB

100.00

Measurement*

Standard Deviation Meter 25 to lOOOMc

200.00

Hardi

22011/

3003- 10 Directional Coupler I to 4&C 1MB

100.00

Polar ad

MSI- 2

Signal Generator 2150 to 4«O0Mc

500.00

Narda

22012/

3003- 30 Directional Coupler 2 to 40c 3048

100.00

E.H.

S74

Microwave Swept Oscillator 8 to 12. 40c

?50.00

Narda

22377

Adapter I to M 8,2 to I2.4GC

35.00

HjJfrttfltO

no;

Tiwe Interval Plug In

50,00

mr**

22538/

4014-10 Directional Couple*" 1-05 to BGc

1048

7500

HJlttarj

T5-1011/

UPMB4 5pectruB Mal/ier lOMt to *0Gc wi

itn

Narda

27539/

4015CIC Directional Couoler 7,4 to 12Sc

1044

05,00

LUcli Filter F3 35/7 33&/F337/f 338/ F34l/H«fl

Narda

22540A7

4O13C10 Olrectional Cowfller 2 t* 45c ION

75,00

Attenuator CA411/CM10/QI409 ffw) lEarjh Adapter

Narda

22574

Directional Coupler 2 to 4Gc lOdft

100.00

UG 1 239/UG 1 240/0* 1 24 1 /i*l 242

1000.00

Narda

Directional Coupler IS. 6 to l?.3Gc

12$,00

General Radio

so&c

Standard Signal Generator lfttc lo SOMc

300.00

Narda

22875/

4014C6 Directional Coupler 3.85 to ftk

648

100,00

Hewlett Patfcird

2JOA

Power Amplifier 10 tn SQQrk 4,!iwatts

100.00

Narda

23105/

4015C3O Directional Coupler 7 to l2.*Gc

30dB

100,00

Hewlett Packard

2308

Power Amplifier 30 to SOOMc 4, Swatts

800.00

Normal

14064-30

Directional Coupler 6 to lOGc 30dB

75,00

Hewlett Packard

240A

Sweee Generator 4.5 to IZOMc

400.00

PRO

C101

Variable Attenuator 5.B5 to £,2Sc 0 to

60dB

350.00

Hewlett Pjciara

HOC

um U JOOMKz

400.00,

PND

0101

Variable Attenuator 12.4 to 180c 0 to 60dB

300.00

Hewlett Packard

4150

SW Meter

?50.00

PNO

205A

Slotted Line with Probe 4 to lOGc

100.00

Hewlett PtcUrt

43 LB

Power Meter lOMc to 406c

150.00

PfS

Frequent j Meter 8.2 to lOGc

125.00

Hewlett Fectae*

606A

Signal Generator SODtz to 65He

BOO, 00

U4I«

«P TwiU li to It.Swc

50,00

Hewlett Picaerd

con

Signal Generator 10 to 42uHc

•oooo

PAD

5815

hravewter 7 to 10,60c

75,00

Hewlett Packard

tost

Signal Generator 10 to ASOfk

500.00

N6001

CrySUl Switch

50.00

Hewlett Packard

W8E

Signal Generator 10 to 4B0Pk:

1500.00

PRO

Themiitor Mount 8.2 to 12.4Gc

125,00

Hrwlett Packard

50BF

Signal Generator 10 to 455«c

1500.00

Ouantatron

SIM

Rodustub Tuner

50.00

Hewlett Pat Lard

612A

Signal Generator 450 to l?JOMc

SOD. 00

RLC

A* 26 IOC

Variable Attenuator

50.00

Hewlett Packard

6144

Signal Generator 900 to ZlOOMc

^00.00

Radar De&lgn

01536

Directional Coupler

75.00

Hewlett Packard

ft&i

Signal Generator IB to 4,2Gc

400.00

Sage

rsa-i

Coupler

25.00

Hewlett Pic* era

M&6

Signal Generator l.S to 4.20c

500.00

5age

2503

M1*er

25.00

Hewlett PjcKint

M8A

Signal Generator 3.8 to ?,6Gc

400,00

Sage

775J.I

Directional Coupler 4 to 50c 341

50.00

Hewlett Packard

6108

Signal Generator 3,8 to 7.6€c

500,00

Sperry NlCrOllfte

12ft)

Frequencj Meter 5. 84 to 8.20c

700.00

Hewlett Pack an*

*20*

Sifrial iwnrmr r to ltGc

400. 00

Stoddart

40515

1048 Atte* **•

35.00

Hewlett Packard

6238

Test Set S92S to TTSflPJc

500.00

Syitron Donoer

PB1313A

Tumble Detector 18 to 2«50c

200.00

Hewlett pitkard

*I6A

Signal Generator 10 to ISGc

2000.00

Tektronti

Saeaplino Head

Call

Hewlett Packard

628A

Signal Generator is to 21Gc

2500.00

t ekl ron 1 i

Sampling Head

Call

Hewlett Packard

940A

Frequency Ooubler 26.5 to 40Gc

1000.00

Tettroni r

S5D

Pulie Generator Head

Call

Hewlett Packard

3!j50A

Portable Test Set

3 000.00

Tektron^

B170A

170 ohm Variable Attenuator

SO. DO

Hewlett Pickird

52451.

Frequency Counter 0 to SOMc

1000. DO

Telonlc

T8P417-34-

5CD2 Bandpass Filter

15.00

Hewlett Packard

525JA

Plug If For above 20 to lOOHc

100-00

Teucan

51TF250-50O

-3AA Tunablr fiandpaii Filter 250 to SOOMc

250.00

Hewlett Packard

52 52 A

Mug ]r> For above 100 to 350*c

200.00

Transco

flfC70!DO

SPOT Switch

25.00

Hewlett Packard

52538

Plug in For above SO to SoOUc

350.00

Uateltne

■01

Adapter i to TME 8.2 to 12.40c

35.00

Hewlett ?acurd

5254B

Plug In For above 20CMc to 3Gc

750.00

Uivellne

9009-10

Directional Coupler a to lOGc lOdtl

100*00

Hewlett Packard

52&QA

Frequerxy Divider to l2.*&c For above

1000*00

wave tea

5O70

0 to 7008 variable Attenuator

75.00

Hewlett Packard

S26ZA

Plug In For above Ttawj Entervat

3 00.00

Urinschel Cng,

#10 to bOot Vairable Attenuator

5000

Hewlett Packard

53278

DW and Frequency Meter to 550Mc

i 500.00

Microwave [qulpmem

Hanufacture

PKD

Mewtett Packard
Hewlett Packard
Hewlett Pfcfcaro

Model

Hewlett Packard
Ttktroirii

DY5fi3fi
491

tt Band Genera tor /Test Set 7.1 to 8,50c
Spectrum Analyzer Solid State lOMc to

iOGc-

100000
70OOOO

Description

Price

Micro Tel WSH903 Microwave Receiver to 40Gc Diqltal Readout

Tektronl* 1908 Signal Genera tor JSWlz to 5QHc

Telonic ZOO} Sweep/Signal Generator Systewi

J305 5 to 1500MC Auiopie*^^3n 1 to 2000* Yjrufrle Marker, 3340 RFVOutyul

Attenuator SO oftna>HSO ff Detector ,3360* Kite Modulation. 337001 iplay Frcoetstng.

9000.00
150.00

1000.00

3302L/U06A Standing wave Detector and Hatched Load
805A Slotted Line SOOMHz to 4Qil
805C Slotted Line SOOMHi to 4Gmj
8091 with 8068 Slotted Line 3 to J?GHl/S81ul Slotted
Lin* 3,95 to $.S56Hi/J*lOI Slotted tl"*

5250.00

200.00
400,00

Ttltimic 2003 Sweep/Signal Generator System

3303 5 to 5O0MC Sweep* 1323 1 to ZOOOHe Variable Marker ,3343 RF /Output

SO onm»3M0

5,15 to 8.2GHj/u3lOfi Slotted tin* 6.2 to
12.4GHZ/F8106 Slotted Line 12.4 lo 180HZ/
X281A A H281A Adapter/HX29?B Tapered

RF Output/ Attenuator SO ohms, 3 350 fif Detector, 33&QA fcate MDdw1at!on,337Q Display

Trin«ition/444A Probe 2.6 to l&GHz/ind a

Process 1n$k

7&0.0O

447B Probe/HtilOB Slotted Line 7

OS to 10,5

900.00

Hewlett Packard

8098 with 0068 Slotted Line 3 to L2GHZ/H8108

Slotted Line 7,05 to I Q. SOU/ IS! 06 Slotted

line 6.7 to )2.4tiHz/HX2?2E Tapered Transit lor.

H to I/K281A I JttBlA/viin Probe. 444 ft 550.00

cfM^Hz

elecfroqic^

Toll Free Number
800-528-0180
(For orders only)

(602) 242-8916

2111W.Camelback
Phoenix, Arizona 850 1 5

*^4e

214 73 Magazine • December, 1981

rtiFkn*F
iftwr Aid*

2 For 1 Clock Sale

UOStiMl I* 2 Fat t t,-fj«*ii

iT^'^MiJiw *"* Clock Part With A Prafta "T1 Ll DMA'

'LjunM*Miiku»*ler«LEI)~»-l>atji Book*

T7> H A|^*

fcie iPH.ikr 1 ]►•

■^1 ITRI

«!" WT4P DG«T* OC *f» M *f - Z"Z- Wlr Wt lit WO *f

IIMTFCRATED CIRCUITS TT* A5 INSTRUMf Nt$ TtMtHM^RATUftE

I.C. SOCKETS I PROG»AMMA8Lf«O0UL£

4* Hm frier Ihffrrrmrr IftBJ "t^WH

. i * , « -» -» ^ i 1 1 1 " KA«m« vmuihd to nift*

M A 1 U J 7 C I O l S« FAUAHMK EUCTIDtt TIC < 1MCITMI r *t*rtrtim.

t -%**!& t* ofp<T Atot ■— m wrt thy 0>q> »>j mm te ctfJifcuBjil lor g iwmw »MM*t tfwn rW »e naf Avtaimatefln N*tniiFgja» '^ HANDLING CHARGES VOLUME DISCOUNT

» W»itaw^ »*» port «g«*«' *fr»* •»rr.<*a ^flvrordr- U*>l p» *f rht *v *•**• and app^T *t» fipprop*>«ff-»' I i wifctsW vto fNr >«• *«(**f*ekl* it«n rbensdri u fl.OO-t *.W 1M UDO ^ D.O0-* "J?.** Ntf

rh» i.arvtiiHij (marge Tf> par oil1 %*iiopmc. flod ifiwtnr fo oo*«»i m rhv U * 1 fOflOdtf flrtj Mf«tp wfrfci trmtk w HHiWf <*iw ottpnvan.P'. grUw f ifl 00^2300 A d-d *C 75 a l»MiH».W L#»» TO"'.

WHIN QIM1IND IT MONI. CALI I 106 lit JU4 {»»_> 1... M., «« HI ill MJI|i tf m*A itM iw "H* f« DICI III. Hi.h«*t !3 Sarin. fWfl *J*i* Fifli M* itrgl i 3VC0 ug ?fl idtflO SO* J5O.O0 H«.M Lettll*.

tssj tut p4f 6? tMfc nw»r Oi«*r MaiIi* Chflffli VLUw CO D D/GfKE V GUARANTEE; A^ o*n or prnduCU f««N»H* frmflTJ,gi k^ thai [Kn»* Tn &frf#riKf»« will vr * -l*%a «9.W Add 10.25 * _ JSS'SS "iTT*" "*' i^« ??-'

fd 4jr Founded ■( rf^rnrrf •il'h.h flfl d^v frpin rr«eipl wilh i\ LH^f tit yinrf in*fli*i» Pncn •■■ I :Hlitf>VI wllPWuh ntMXe ,*100.00 A, Up No Charge *11AJU.UU & Up leH ■" ;

**See List of Advertisers on page 162

73 Magazine • December, 1981 215

FULL LINE ALL PARTS & COMPUTER PRODUCTS

P.O. Box 4430M
Santa Clara, CA 95054

Will calls: 2322 Walsh Ave.

(408) 988-1640

Sim* day iftlpmtnt First ime parts only. Factory tested Guaranteed
money back Quality IC's and other components at factory pnces

INTEGRATED CIRCUITS Phone orders only (BOO) 538-8196

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ELECTRONIC SYSTEM KITS

Apple Piripftf m Nits

SERIAL 1 0 fKTEFIFACE 0 id 30.000 baud
0 Tft Input A o-jtpiit from monrtof or basic, or
use Apple as mieJIiaenl lemnnai. Bd only (P N 2)
$1*96, KJI iPN 2A) 151.25, Assembled (P'N
20 $62.95,

i WTOTYPInG BOAflQ (P/N W7] Hi ,16
PARALLEL TRIAC 0UTPLJT BOARD fl tfiacs.
etch can switch 1 10V. 6A loads. Bd onry [P-U
2101 Stl^O, Kit {P/N 210AJ $119.56.
OFT^fSOLATED INPUT BOAflO 8 mptrts. cart
be driven from TTL «agic. Bd only IP-N 120)
S15.65. Kit IPH 120A) SC9.95.

Inlirlica KUt

SERIAL PARALLEL INTERFACE Bidifsctional.
Baud rales from 110 to 19.2K, sw selectable
polarity of inpul and output strobe, S to B data
oils, 1 Of 2 stop bits, parity odd or even or none,
all characters contain a start bii. » 5 & —12V
required 3d only (PN 101) I1lJ6t M (P/N
10lA|S42.ti.

RS-232JTTL INTERFACE BidireclionaL ft-
qwres -12V. Kit iPN 232A) 11.19.
RS-23220mA JNTfRFACE Bidirecnonal. 2
passive opto-isotated okm. Kit (P N 7901 Ai

BS-afi/TTY INTERFACE BitfiFeaional ZafifiH
circuits, (P/N fiOOA) W-«,

Suppllfli

VERBATIM DISKETTES

129.95, flJ' |39 95

FLOPPY DISK JACKETS Fits 3 ring binder. 5V*"

tioWs2. 3 holds 1, Breach

Oataliffl box of 10.

5V4"

PROM Eraser

Wl erase 25 PflOWs in IS minutes Lirtravio*«,
assembled 25 PftOM capacity 1 37.50 (wrtri
timer S69.50V 6 PROM capacity 0SHA. UL vw-
sion S7|,50 {wrth timer Si 01.50;

Z80 Microcomputer

16 bit 1/0, 2 MH2 clock. 2K RAM. ROM Bread-
board space. Excellent for control. Bare Board
120,50. Full Kit $99.00 Monitor 120.00. Power
Supply Kit $35,00. Tiny Basic 130 00

Modem Kit $60.00

Stale of trie art. ong.. answer No tuning neces-
sary 103 compatible 300 baud Inexpensive
acoustic coupler plans included. Bd only
$i 7.00 Ancle <n June flato Eieetrwm

NiCad Battery Fixer Charger Kit

Opens shorted cells that won't nolo a charge and
then charges them dp, all In one kit wlull parts
and instructions. 19.95

60 Hz Crystal Time Bate Kit $4,40

Converts dwjrtal docte from AC tine frequency to
crystal time base QutsSandmo accuracy

Video Modulator Kit 59.95

Convert TV Mt into a fi»gh quality monitor wo
itftctrnfi usage. Comp. lot wluil rnslruc.

MuNi-volt Computer Power Supply

Bv 5 amp. ±18v .5 amp, 5v 1,5 amp. -5v
5 amp, 12v 5 amp, — 12v option, *5v, * 12v
are regulated Basic Kit $35.95, Kit with chassis
and all hardware $51 .95. Add S5 0Q shipping Kn
Of hardware $16 00, Woodgram case $1000.
$1 50 Shipping

tUllBJy

f/iHf

RCA Cosmac 1802 Super Elf Computer 5106,95

Tne Super Etf is a small smgte rjoard computer that for PC cards and a 50 pin connector slot for the
does many Mo. trttngs Its an exceflent computer Quesi Super Expansion Board Power supply and
for trartng and try teanwiq pro<yamm»no with as sockets tof aO IC's are trvJuded plus i aetata!
machine tsnojuage and yel it's easily expanded 127 pg foliucbon manual wtiicn now tnduoes
wnfi addittanal memory Full Basic, ASCII over 4C pos. of software uta. incijding a senes of
Keytioards, video cterader geaxiuofi. etc. lessons to heip get you started and a muse pro-
ROM montior State and Wode displays, Smote O™"1 ^ O^phics taroet game Many schools
step, Optional address displays: Power Supply; "* tinrversitjas are using me Super f as I

Audio Amplifier and Speaker, M\v socketed for alt
IC's: Full documentation

The Super EH induces a ROM monitor for pro-
gnm loading, editing and execution wim SINGLE
STEP tor program detwQQ>nq wnch rs not n>
cWed *i others at me same price W<ffi SiHOlf
ST? you can see the microprocessor crap oper-
aong with i» aipn Onat address and data pus
displays batav* bb1b| and ribr oecuting in-
structions Also, CPU mode and iistrudion cycte 5&J00 l"*^*lfffl^^EP*Lt5^1at! l*tCwl

course of study OEMs use it for training and
R&D

Remember, other computers onry otter Super Ell
features at additional cost Or not ai ail Compare
before you buy Super Efl Kit $106 95. High
address option M 95. Low address option
$9.96 Cuiiom Catirwt with dnded and labeled
ptaiotass front panel $24 95, AI mem Expansion
Cat&net pav^d and sft screened, with room for

Battery Memory Saver Krl W.96. All kits and
options also completely assembled and lested.

Quesldata, a software publication for 1802 com-
puter users is available by subscription (or S12 00
per 12 issues. Single issues $1 50 issues 1 -12
bound S16 50.

are decoded and displayed on B LED indicators

An RCA 1361 tfdeo graphics chip allows you to

conned to your own TV with an i nexp«nsiw! wtien

modulator to do graphics and games There is a

speaker system included lor writing your own

music or usmg many music p^og/ams already

Brtttn TriespeatoampW»Kfnayatsobeusedto Moews Video Graphcs S3.50. Games and Muse

dnve relays tor cortrol purposes. $3, 00. Che 8 Nopreter $5-50, Starstip 4K cas-

A24>^Ha^eyt0^rt^X4^^16^«^gyspl^s setfefU.95.

load, reset, run. wail, input, memory protect.

monitor select and single step Large, on board Crap Id nanp hrnrhiirP

di&piav& provide oilpui and optional Mgpi and taw r/ee '* rdU® DHJCnure

adores* There rs a 44 pm standard connector slot 0l Complete Super El! System.

Super Expansion Board with Cassette Interface $89,95

This is irury an astounding value? This board has gram bugs quickly then follow with single step it

been designed to allow you to decide now you you haw tne Super Upauion Board am Saav

want i optioned Tne Super Expansion Beard Wanaar the monery >s up and running at tne push

comes wMi 4K el low power RAM My adOress- of a but^n

aba arywriere n -64K wrtti i r*BVin mamgry pro- cxher on board options route PWanit aaW aW

Outaal Ports with luM twaajaaai Tneyataweasy

toenmade lor all other options cm the same board
and n fns neatly mlo the na rdwood cabinet
alongside the Super Eh The board includes slots
for up to 6K ot EPROM (2708, 2758, 2716 or J\
2716) and is fully socketed, EPROM can be used
for (tie monitor and Tiny Baste or other purposes

A 1K Super ROW Monitor S \ a 95 S avatoOie as an
on board optjon in 2706 EPROM wtucti has been

connection of an ASCII keyboard Id me input port
RS 232 end 20 ma Current Loop tot teletype or
'ii I'M device are on board and if you need more
memory there are two S- 100 s3ots for static RAM
or video boards Also a 1K Super Monitor version
2 with video drwr for fuK capability display with
Tiny Base and a video nteriace boam Parallel
I 0 Ports 59 85. RS 232 $4.50, TT> 20 ma I F

piepioqranvried wirjt a program ioader edfey and $1,9S. S-100 $4.50. h 50 pai connedpr tat wJh

error checking mutti He cassette read *me ribbon cable e avatabte at $15 25 for easy con-

sottware, (rekxataOte cassette fie) another exdu- necbon between tr» $aaw W and me 8apar

sws from Quest it includes register save and Eiaanaaa tart.

readout, bloc* move capaWir, and vrteo graphics p^ s^^ m (or ^ cgn^g ^^ {m

dnver with Hinting cursor Break points can be Mulli-volt Power Supply below)
used with the register save feature to isolate pro-

Quest Super Basic V5.0
A new enhanced version of Super flastc now
available Quest was the first company worldwide
to stop a full see Base for 1803 Systems. A
complete function Super Basic by Haa Ceakar
mduding floating point capabity wrth soentitic
notation {number range s 17E"). 32 bit mteoer
-2 billion, mufti ^im arrays, stririg arrays; siring

manipulation; cassette 1/0: save and load, basic,

data and machine language programs; and over

75 statements, functions and operations

Mew improved taster version mctud re-

Bwaaar and essentiaay aaWaBBi

Also, m exclusive user expandable command

library

5cnal and Parallel i 0 routines included

Super Batrt on Cassette $55.00.

1802 16K Dynamic RAM Kit $149.00
BoandaoJe lo WK Hidden refresh W'docta up to
A MH? mm wait States MeM 16K RAM $25.00,
S-100 4-ttat BBasslon S 9.95

Super MaaaarVl J Source lifting $15.00

Super Color S-100 Video Kll $129.95

Expandable to 256 x 192 high resolution color
graphics 6847 with ail display modes computer
controHed Memory mapped. IK RAM expand-
able to M S-100 bus 1807. 8080, 8085. Z8C,
etc Dealers Send kit ercellent pridnf/

Type*N-Talk by Votrax

Text lo speech synthesizer with unlim-
ited vocabulary, built-in text to speech
algorithm, 70 to 100 bits per second
speech synthesizer, RS232C Interlace
$36900.

81 IC Update Master Manual 559,95

Ell II Adapter Kit $24.95

Plugs into Elf II providing Super Elf 44 and 50 pin
plus S-100 bus expansion. (With Super Ex-
pansion} High and low address displays stale
and mode LED's optional SIB 00,

TERMS: $5 00 rntn order US Funds. Calif residents add 6°* tat.

SID 00 min VISA and MasterCard accepted. Si Q0 insurance optional.
Shipping: Add 5%; orders under $25.00—10%*

FREE: Send for your copy ot our NEW 1981
QUEST CATALOG. Include 88c stamp

216 73 Magazine • December, 1981

RAMSEY
ELECTRONICS
■'62 inc.

PARTS WAREHOUSE

We now have available a bunch of goodies too
good to bypass Hems are limited $o ordpf toririy

2575 Barrd Rd.
Penfield, NY 14526

716-506-3950

MINI KITS - YOU HAVE SEEN THESE BEFORE NOW

HERE ARE OLD FAVORITE AND NEW ONES TOO.

GREAT FOR THAT AFTERNOON HOBBY.

MINI
MIKE

A super high performance FM wire-
less mike tail' TranamMs a stable
ngnai up to 3QQ yards wrth excep
horn I audio quality by means of its
built m elecirei mike KM includes
case mike, on-oft twitch antenna
Penary and super instruct tons. This
ti i he fittest unit available

f MO Kit S14 95

FM-3 Wired and Tesied if 05

Color Organ

music come
ahve1 3 different
lights f ticker with
music, One fight
each for, high,
mid-range and
lows Each mdi-
vidualiy adjust-
able and drives up
to 300 W funs on
110 VAC

Complete k*\
ML-1
W 95

VMM UodulaiO* MM
Convavta any TV to nd» momlo* Super
stable funab** awv eft a-& Runt on 5-
iSV acc*pH iw vKfcononai Stir urn* on
the market' Comfj+ele hii vD i S7.0S

Lad Bllnfey Kit
A great altenHon get-
ter which alternately
flashes 2 jumbo LEDs
Use for name badges
buttons warning
panel lights, anything'
Runs on 3 to IS volts
Complete kit BL-1
ttJt

Super Staulh
A super se n s i It ve a m pi i -
fier which win pick up a
pin drop at 15 leet' Great
for monitoring baby's
room or as general pur-
pose amplifier Furl 2 W
rms output, runs on 6 to
15 volte uses B-45 ohm
speaker
Complete kit BN-9

IS 95

CPO-1

Runs on 3-12 Vdc 1 wall out. 1 KHZ oood for CPO

Alarm Audio Oaeii later Complete kit 12,9*

Call Your Phone Order in Today
TERMS: Satisfaction guaranteed or money
refunded COD- add $3.00 Minimum nrder
£6.00 ■ jsundeiSlDG0add$1.5rj Add 5
tot postage i insurance, Handling. Overs I
add 15 esidentsadd "i»

CLOCK KITS

Your old lavon1« ere ban again. Over 7,000 Sold to Data,
Be on* of ihe gang and order yo-ura today1

Try your hand at building the finest looking clock on the
market. Us satin finish anodized aluminum case tooks great
anywhere, while six A" LED digits provide a highly readable
display This Is a complete kit, no extras needed, and it only
takes 1-2 hours to assemble Your choice of case colors
silver, gold, black (specify)

Clock kit. 12/24 hour DC-5 $24.95

Clock with 10 mm ID limer. 12/24 hour. DC-T0 S29,*5

Alarm clock, 12 hour only. DOS $23.95

1 2V DC car clock, DC-7 $29,95

For wired and tested clocks add $10 00 to kit price
SPECIFY 12 OR 24 HOUR FORMAT

FM Wlrelemt Mike Kit

Transmits up to 300' lo
any FM broadcast ra-
dio uses any lype of
mike Runs on 3 to 9V Type FM 2
has added sens* live mike pre amp
stage

FM i kit tt.» FM ? kit U 0$

Whriper Lighl Kit

An jnteresling kit, small mike
picks up sounds and converts
them to light The louder the
sound the brighter the light
Includes mtke. controls up lo
300 W. runs on 110 VAC
Complete kit. WL-i
16.95

-M

Toot Decode*

A complete tone deco-
der on a single PC
board Features 400
5000 H? adjustable
range via 3D turn pot. voltage regu-
lation 567 IC Useful tor louch-
tone burst detection. FSK etc
Can also be used as a stable tone
encoder flung on 5 to 12 wo 11 5
Complete kit TO-1 £5 95

Car Clock

The UN- KIT. only 5 aoldar connection!

Hera's a mpcr toeing, rugged and accural* anin cipch which i» a $nap to build and
install ClDck move men i u completely Assembled — you only aoldar 3 wr&s and 2
iwitxhei lakes aboui IS minutes' Display ft hn^hi green with automatic bngrnneii
coniroi photocell — aaauiea you of a highly readable display day a* night Comei in a
ulm lintan j nod 1 red aluminum case which can be aitach#d 5 diluent **vs uimg 2 noed
rape Choice of felvei o'acN 0* goW cam <m>*c''*'

DC 3 ail 12 hHMH lorinel
DC 3 +r>**c arm ie»ted

12* ts

12**4

UnHjeraa* Timer K.i

Provide* me banc pa Ms and PC
board required to provide a source
oi precision liming and pulse
generation Usee 555 timer IC and
includes a range of parts for most
liming needs

UT-S Kil SS 95

Mad Blaster Kit

Produce* LOUD ear shattering and
attention getting siren like sound
Can supply up to 15 watts of
obnoxious audio Runs on (MS VDC

Siren Ktt

Produces upward and downward

wait characteristic of a police

siren 5 w peak audio output runs

on 3-15 volts, uses 3-45 ohm

speaker

Complete kit. SM-3 $2.95

Calendar Alarm Cioc k.
The clock thal's got it all 6-5" LEDs
\2>2* hour snooze 2* hour alarm 4
year calendar battery backup, and
lots more The super 7001 chip is
used Si*e 5x4x2 inches Complete
kit, less case (not available }
DC-9 *3495

Wider Dam Car clock

1 1 ?* four dorm ■* a h«MM p*»lftc uw J
§ m<*-00 «£0 1605 *!•&*■ accuriry i QQl^i
1 *■'» Hooigp fr*QH+ bwifcj with igni(ion
tufwr <ntlruclrfKtf Opi'Oiai d^mmff vluQfniilrffl'hr
^dfusr* ditcitay to irnbumi light (e«el
DC M tliK* win m1g braeum t^; « mi

dM i d<mmei an»pt*f ItM

a*J tio« Mir and t«i

MB-1 Krt

S4 9E.

*0 M* Time Bau
eum i>n S< IS VOC Low currpni i? Snui i

re ?*ty st.H

PARTS PARADE

Video Terminal

* L ompJH»ty w»1i-con|»in«3 Il«"d Hoie v-fleo I»**"'HikI i **i3 fl^auifPl Ciril^ ifi ASCII i-B>BO»rfl*rm T V

mpi io r>»com^ t cow*p*etaiawwtna< %im* Fr*n>ir%*tt %m&*iv tuftpti, Hal tonitoMefl*ync tno baud
mm i!d laOOi compvit (Mttpmar and fteyfrwc tontro e* ruiw !>><ir *f»ch co«iftf n
*«epn Tut atmnm «*,i ASCw pi^ pajjyiri My&w* input Thea«ii<«a4c«w bpiii

RE tiif *»m«Tai eve ># >«M MO 00 *» mtf nMI)

* *

#.*

lift**

ion

11iH

it a*

IC SPECIALS

LINEAR

301
380

7*1

i*sa

39O0

aoaa

«a>

(35

II SO

I 44

II 00
1100

ttoa

HUM

* M

I SO

Pt»

12 95

4f>11
4Q13
4046

4049

CMOS

4518
56»

.50

*185

,50

moo

$2.00
$135
S175

READOUTS

FftOHe rCC ti tO

FNO»?"ST0 S C A T«

MAN t ItHPTHQ JJ"C * 1 rjg

HP7B41 4HCA 20a

TRANSISTORS

mm* hph c*f iiviiat

C*r isvuat

C-r * * ■! 1 aa
?t*M «o ItFAj c- f in «

saaattarcT'C'F a/itta

MaKMaPQ* in x

3»«aoot S*# * *i **

Jttjrr» m*H &Kon IT M

jM4lTlU»**alHi* him

fg.fi T*ft Ntm Aow Iffl «
ntflW ?■» P**P 4QW l-l H

MM lO*,-J«MM |.M

NPN WW Type T*« Wia M

PNP IHt TyiM T-R 90/12 M
7M30JS 1*0

2MM4*UJT 1414*

TTL

7 4S00

7447

7475

7490

74196

$40
$ .65
$50

S EI
Si 3S

SPECIAL

Reaitlor A»n
Assortment of Popular values - '.
wall Cut lead lor PC mounting, '•*'
center. "^" leads bag ol 300 Or
more.

$1.50

Swilchea
Mini toggle SPOT $1 00

fled Pushbuttons n O 3/S1.00

HC90
1Q116
7206

7 207 A
72160
7107G
5314

5375AQ/G
7001

SI 5.00
S 1 25
S1750
S 5.50
$21 00
$12,50
$ 2 95
S 2 95
$ 6,50

FERRITE BEADS

WAm mfci ar

■* t'
sin

Soc* tts

a Pin 10.-S2.0Q

14 pin 10.-S2.00

16 Pm 10/1200

24 Pm 4/12.00

28 Pin 4/12.00

40 Pin 3/12.00

Olodet
5 1 V Zener 20/11.00
1tV9U Type 50/1100
1KV 2Amp B $1 00

100V lAmp 1S/S100

Earphonei
kaadt 8 on<*r good loi vntii tone
a'aim cMKki etc
5 f Of 11 0Q

» Ohm Spf ak*r
Approi 2 «" Oiam HowthJ
lype fQt f»d«a5 n«ke tic
3 lor 13 00

Crytlalt

3 579545 MHZ S1.S0

10 00000 MHZ 15.00

b 248500 MHZ 15.00

AC JMtapHen
Good for clock* riicad
char^ers^aii 110 vaC rnuq

HOO
12 50

WOO

ti «i*C # 20 m*
lft vac @ laOntA
12 raci 250m A

small

• .;-£-

cormpal ibfe

Sotd Slate Bui »n
i;rn aSO Hi 66 jB sound
n S-12 *dc al 10-30 mA TTl

ti SO

Slug Tuned Coll*
Small 3/16" Hex Sluga turned coil
3 (Lima to for ti. 00

AC Outlet

Panel Mount witri Leads

4/S1 .00

CAPACITORS

TANTALUM

Q4BSW0 too** iNKtrelyipe

1.5 uF 25V 3^1.00 2* SFJ£\n'd*

i.e uf 25v 3*1 oo ?S;J "v r; ;, n, «

-22 uF 25V 3/Si 00 'r>^ hvh-j « io ji to

OI3* CI AAHIC

oi tev c^m nitH
i i*v i vii no

001 iSV TO n t»

*O0of aavnoo

O0«r aviiaa

DC-DC Convert**
>S irtSc mpuf prod -9 *dc # 30ma
> 6 vdc produces -t£*dc#35ma f1 25

2SH 20 Turn Tnm Pol ti 00
IK 20 Turn Trim Pert I SO

Ceramic IF Fillers

Mini ceramic filters 7 kHz

BW 455kK;ti 50 ea

•It-*

Trimmer Cape
Sprague 3-40 pf
able Polyprop/lenr*
SOaa.

Audio
Preacaler

Make high resolution audio
measurmonls, great tor musical
instrument tuning, PL tones, etc
Muliiplies audio UP in frequency,
selectable x10 or x100. gives 01
HZ resolution with t sec gate
time1 High sensiiiviiy of 25mv. 1
meg input z and built-m filtering
gives great performance Runs
on 9V battery, all CMOS
PS 2 kit S29.95

PS 2 wired $39 &5

600 MHz
PRESCALE

Extend the range of your
counter lo 600 MHz Works
with all counters Less than
150 mv sensitivity specify -
10 or -100

Wired, tested. PS-IB $59.95
Kit, PS-IB $44.95

30 Walt 2 mtr PWR AMP

Simple Class C power amp features 8 times power gain 1 Win
for 8 out, 2 W in for 15 out, 4W in for 30out Max outputof 35 W,
incredible value, complete with all parts, Jess case and T-R relay
PA-1 , 30 W pwr amp kit $22 95

TR-1, RF sensed T-R felay kit 6.95

M Pi F 23ft trans is lor as used m PA-t
a-iOdogam ISO mm in 95

RF actuated relay senses RF

(tW) and c roses DPOT retay

For RF sensed T-R relay
Tfl-1 Kit $6.95

r*ttmt* Supply KK

Complete iripie r«gu<alec3 power

supply provhdes vinaOJe 6 to 1 S volts al

TOO ma and -5 all Amp Exce+ien! toad

regulation good tillering and small

live L e*s trans tor mors . require* 6 3V

la 1 A and 24 VCT

Complete hit. PS-3LT 16. »S

Cryilal Microphone
Small 1" diameter V Ihick
crystal mike carindgt 1-75

Coa* Connector

Chassis mount
BNC type Si .00

2b AMP

100V Bridge
$1.50 catch

Mini-Bfidge SOV
1 AMP

2 for $1,00

Mini RG 174 Coan
10 M lor SI 00

t Yatt mmttmrr C**p*
Np» Owal'Ty ttipl llerll

*~ Hi*M»* Grommeli id t*r §1.

aui of c«Hn«a aoc caea I
l'WMtm u ort^ v*C* c*tn vs

1*1 t>*9 i in pet tt at «g D*e mo pc> o-sa

B pm lyp* 9o*fl concacti for
•ti* 1003 car clock *noduta
prtc* Ti aw.

L*da - your chofca piaase specity

Mini Red, Jumbo Red, High Intensity Red. illuminator Red ■/$!

Mini YgUOw, Jtimpp VaMqwr, Jumbo Green ft/ft

Viietltft
MoiorolB MV 2200 X) PF Nominal ctp 20-00 PF

SO mc* <k 3 11 00

TunaWa *anga

OP- AMP Special
euftTTLF 13741 - Direct pm tor pin 741 companble but 500.000 MEG
input z. super low SO pa input current, low power drain
Sir lor only $9 00 10 for 1300

76MG

79MG

309K

r«05

II 25
ISO
S1.1S
11.00

76-12
7815

191?

7915

11.00
$1.00

n 2*

II 2$

thrtne TuOancj Nuba
H>ct pracul pees ol *hn^t ut* i~ « -
innnk to *" Great lor tpiicat i^fl.00

TO-V2 n»at S*r*i
niermanoy ara^d * ic* n oo

To-220 Keet S^nht J lor 11 00

Opto Isolators - 4N28 type

Opto Reflectors - Photo diode * LED

$.50 oo.
$1.00 ee

Molai Pint
MpJ»pi alr«a(]> pracul m longfh of 7 <Fvrt«cl
lor 14 pm aocheti 20 iirtpa lo* H 00

CDt Pbolocalla

n*n nance variti *nn light. 230 ohmi lo
a*mt 3 meg 3 low |1 Ot

Us I of Atfrsftts&r* op page 162

73 Magazine ■ December, 1981 217

-« 2822 North 32nd Street. #1

ATLAS FILTERS

Phoenix. Arizona 85008

Phone 602-956-9423

ATLAS CRYSTAL FILTERS FOR
ATLAS HAM GEAR

Your Choice

$15,95 ea

5.645
5.595

5.595

5.595
9.0

2.7/8
2. 7 USB
2. 7/8/L
2.7 LSB

. 500/4
USB/CW

Soldering Kit

New Welter Soldering Iron Kit

#SP-23F 9. 99 each

Kit includes:

1-25 Watt soldering iron,
develops 750° of tip
temperature
3 - tips (screwdriver, chisel,

cone)
1 - soldering aid tool
1 - coil 60/40 rosin core solder

CERAMIC PLATE CAPS

$1.09 each
#1 type for 3/8 plate cap
#2 type for 5/8 plate cap

Used NiCads

Used C Nickel Cadmium Batteries

1. 8 amp hour

Pack of ten $8. 99 per pack

CERAMIC COIL FORMS

$1. 99 each
#1 3/16" x 4/8"

#2 3/16" x 1/4"

#3 1/4 " x 3/4"

#4 3/8 " x 7/8"

#5 3/8 " x 5/8"

AH of the above have
powdered iron cores.
#6 1/2" x 2 3/4"

NEW BOGNER DOWNCONVERTEK

Industrial version.

1 year guarantee $225. 00

NOT FOR SALE IN ARIZONA

UHF/VHF RF POWER TRANSISTORS

CD2867/2N6439

60 Watts output

Reg, Price . $45.77

SALE PRICE . . . . $19, 99

CHOKES

t X3 Uul » • • * * * • • *

150 uH * -*»•••••

.1-3 uH
VTV .15
VTV 150

5-20 uH *

Variable coil 10-80 uH -
Transformer dual 8. 8 uH-

.47uH
-68uH
1 uH
1.2 uH
1.5 uH

2.2 uH
2, 7 uH

3.3 uH

6.5 uH

7.5 uH

10 uH

15
20
22
33
39
47
50
56
62
68

uH
uH
uH

uH
uH
uH
uH
uH
uH
uH

100 uH .

120 uH ,

185 uH

538 uH .

680 uH ■

1000 uH

1630 uH .

-1 mH

.2 mH

.22 mH

.27 mH

.33 mH

.39 mH

.240 mH

1.2 mH

1.5 mH

1.65 mH

1.75 mH

1* 9 mH

1 mH

1.88 mH

2 mH

2.4

2.5
2.7
3.0
3.6
4.3

mH
mH
mH
mH
mH
mH

1. 00 ea, or
1.00 ea. or
1.00 ea. or
L00 ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1. 00 ea. or
LOO ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1.00 ea. or
1. 00 ea. or

1. 00 ea. or
1.00 ea. or

1. 00 ea. or
1. 00 ea. or
1.00 ea. or
1.00 ea. or

• *

* * *

. .

1.00 ea. or

...2.99
...2.99

• • ■ z . y st
...1.69

* * * £t * *f •*

* . . x. UU

10/7. 50
10/7. 50
10/7. 50
10/7. 50
10/7. 50
10/7. 50

10/7. 50
10/7. 50
10/7. 50
10/7. 50
10/7. 50
10/7. 50
10/7, 50
10/7. 50
10/7. 50
10/7. 50
10/7. 50
» . * £m y y
...1.69
10/7. 50
10/7. 50
... 2. 99
...1.69
10/7. 50
10/7. 50
10/7. 50
10/7. 50
. . . 1. 50
... it . yy

. . . £t . y y

■ - - £- yy

■ * . « . yy
... 2. 99
... 2. 99

* + * u ■ yy

* * * a. yy
... 2. 99

* * • z. yy

• ■ . Z. WS

... 2. 99
... 1.69

• - - o. 99

. ■ » £t . y y
... 2. 99
10/7. 50

... 2. 99
... 2. 99
...2.99

r . . &. yy

HIGH VOLTAGE CAPS

420 MFD § 400 VDC
600 MFD A 400 VDC

3. 99 each
3. 99 each

4.7 mH - ..2.99

d nii* - - * ....*•. .»■-.. ...6. yy

5. 11 mH 2.99

6 mH 2. 99

7. 2 mH .- - — ...... 2. 99

O. &9 J] 111 • ■ ■ . . - - * . . ... • *...£. *7i7

Ot uC n n * ■ r 1 » . t i » 1 1 i £■ J*

o.o mil »•***•.•#*---*..*..«. yy
10 mH 2. 99

12 mJn ..........**...... Z. 99

A. iJ III IT ........ ...a>a.-a.O.VV

17 mH . . .. 2.99

19.6 mH 2.99

20 mH . . _ . ~ . . . ,..2. 99

20.5 mH 2.99

U £t a V 1 iXl .. . . a ■ *. ... ...... *4Ua.7*tf

z*i mri ...*•............. z. yy

*jO . I i i « i • ■ £. 3i1

29.9 mH 2.99

30 mH 2.99

36 mH 2.99

UVi J 1 lUl .. a . . . a. . . ■•..*(..«■ 99

" V I I I li ........ a m ...a w * m m w £tm V*f

IV a at. lit] .... a.... ...... ■ i ■ £f WV

1 O IJ] J 1 ... ■ . a .. a .. a f ... ■ * £• VV

T . .................. 4b . V *J

50 mH ...2.99

59 mH . 2.99

60 mH .......... 2.99

71.5 mH 2.99

( o ■ i mn ■ ..... .,+**. * » . . - ■ 6i yy

86 mH 2.99

luo mH ,.**.. ........... * z« yy

A4U\f mti #•.••«... a... a aa. a ■£ . yy

A DU nirl .••••#•* i ..... ... a £m. yy

175 mH 2. 99

zuu mil „.. ....•«*..... ... z. yy

205 mH .2,99

237 mH ...2.99

240 mH 2.99

300 mH 2. 99

360 mH 2.99

390 mH 2. 99

TvU III IT- . . . . . » ■ . . a a a . . . a ■ * it- \3 tJ

500 mH .-1.50

D \J \J 1 1 IJ • * - - - . a -♦ + »-* . ■ ■ . . £t Jt?

1000 mH ......... 2. 99

1.5 Hy .2.99

2.0 Hy ....2.99

£t m ♦/ 11 Y ........ ...I...... ■ - 4W . a? 7

3.0 Hy 2.99

5.0 Hy „ 2.99

10 Hy 2.99

New Fairchild Pre scaler Chip

95H90DCQM 6. 50 each

350 MHz prescaler divide by 10/11

218 73 Magazine • December; 1981

Johnson
AIR Variables

1/4 x 2 1/2" shaft

RF Power Device

MRF454 Same as MRF458
12.5 VDC, 3-30 MHz
UOWatts output, !2dB gam

$17.95 ea

E.F. JOHNSON
TUBE SOCKETS

#124-0311-100 6. 99 each

For 8072 etc.

H24-0107-001 13. 99 each

For 4CX250B/R, 4X1 50A etc,

#124-0111-001 4. 99 each

Chimney for 4CX250B/R and

4X150

#124-0113-001 and 124-0113-021

$12. 99 each
Capacitor for #124-0107-001

#123-209-33 Sockets 6. 99 each

For 811A,572BI 866, etc.

UNELCO CAPS

6. 8pF

47pF

8.2pF

62pF

lOpF

iOOpF

!2pF

160pF

13pF

l80pF

14pF

200pF

20pF

240pF

24pF

380pF

33pF

470pF

36pF

lOOOpF

43pF

350V $1,00 each

96 Pin Moiurulv Bus Ed&t* Curineclurs

Gold plated contacts

Dial 43/86 pin 156 spacing

Soldertail for PCB.

^,. .$3.00 each

110 VAC MUFHN FANS

New . .
Used .

.....

- $U-95

$2.50 each

193-10-6

2. 2 to 34 pF

193-

1.5 to 27.5pF

193-

.6 to 6.4pF

$1.00 each j

160-107-16

.5 to 12 pF

193-10-9

2. 2 to 34 pF

193-10-104

2.2 to 34 pF

193-4-5

3 to 30 pF

2N2857JAN

2N2949

2N2947

2N2950

2N3375

2N3553

2N3818

2N3866
2N3866JAN

2N3866JANTX

2N3925

2N3948

2N3950

2N3959

2,50
3.60
15,00
4,60
8,00
1.57
5.00

1.00
2.50
4,00

10.00
2.00

25.00
3.00

Transistors

2N3960JANTX 10.00

2N4072 1,60

2N4427 1,10

2N4429 7. 00

2N4877 1.00

2N4959 2.00

2N4976 15.00

2N5070 8.00

2N5071 15.00

2N5108 4.00

2N5109 1.50

2N5179 1.00

2N5583 4.00

2N5589 6. 00

2N5590 8.00

2N5591 11.00

2N5635 5.44

2N5636 11, 6C

2N5637 20,00

2N5641 5.00

2N5643 14,00

2N5645 10.00

2N5842 8.00

2N5849 20,00

2N5942 40.00

2N5946 14,00

2N5862 50.00

2N6080 7.00

2N6081 10.00

2N6082 11.00

2N6083 13.00

2N6084 14.00

2N6095 11.00

2N6096 20.00

2N6097 28.00

2N6166 38.00

2N6368 22.99

A210/MRF517 2.00

BLY38 5.00

40280/ 2N4427 1.10

40281/2N3920 7.00

40282/ 2N3927 10.48

High Voltage Caps

30 MFb p, 500

22 MFD t"' 500
100 MFD (<* 450
150 MFD <* 450
225 MFD fii 450
.00l/1000pF fe*

.001 (" 2 KV
.0015 (f<« 3 KV

.01 ^ 4 KV

-01 (a i.eKv

VDC
VDC
VDC
VDC
VDC
10 KV

.02

.01

8 KV
1 KV

1.69
1,69

£i » Cm -it

3.29

4.29

.89

4/1.00

3/1,00

,79

4 1.00

2.00

6/1,00

NEW 2" ROUND SPEAKERS

100 Ohm coil $.99 each

PLASTIC TO- 3 SOCKETS

4/ $1.00

CRYSTAL FILTERS

Tyco 001-1^*880 Same as 2i94P

10. 7 MHz narrow band

3 dB bandwidth 15 KHz min.

20 dB Uindwidili 60 KHz nun.

40 dB bandwidth ISO KHz mm.

UltirnaLF 50 dB insertion loss 1 dB max.

Ripple I dB max. Cl. Q+/-5 pF 3600 Ohms

$3 99 each

78M05

Same as 7605 but only 1/2 Amp

5 VDC . 49 each or 10/$3.00

ORDERING

TRIMMER CAPS

Sprastut. Stable Polypropylene
.50 each or 10/4,00
not sold mixed
1. 2 to 13pF
2 to 30pF
3-9 to 18pF
3. 9 to 40pF
3. 9 to 55pF

Carbide Circuit Board Drill Bits
for PCB Boards

5 mix for $5.00

l-Fet

J310 N-CHANMEL J-FET 450 MHz
Good for VHF/UHF Amplifier,
Oscillator and Mixers 3, Si. 00

MURATA CERAMIC FILTERS

SFD 455D

455 KHz 2. 00

SFB 455D

455 KHz 1.60

CFM455E

455 KHz 5-50

CFU455H

455 KHz 3,00

SFE 10, 7MA

10.7 MHz 2.99

TEXAS INSTRUMENTTIL-305P
5x7 array alphanumeric display

$3. 85 each

INSTRUCTIONS

Check, money order* or credit cards welcome. (Mister Charge and VISA only J No personal check* or certified personal
checks for Foreign countries accepted, Money order or cashiers check in U.S. funds only. Letters of credit are not acceptable.

Minimum skipping by UPS is 12.55 with insurance, Please allow extra shipping charges for heavy or long items.

AU parts returned due to customer error or decision will be subject to a 1 5*% restock charge, i f we are out of an item ordered,
we will iry to replace it with an equal or better part unless you specify not to, or we will back order the item, or refund your
money,

PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE. Prices supersede alt previously published. Some items offer-
ed arc limited to small quantities and are subject to prior sale,

We now have a toll free number, but wt ail that it be used for ch&rge orders only. ] f you have any questions please use our
other number. We are open from 8:00 a.m. - 5:00 p,m Monday thru Saturday.

Our toil free number for charg * orders only is 800-321-361 1.

2822 North 32nd Street. *l

Phoenix Arizona 85008 • Phone 602-956-9423

**See List of Advertisers on page f62

73 Magazine • December, 1981 219

**\2

P.O. BOM 401244E GARLAND. TX 75040 214/270-3553

^SUPERSTAR SALE!*

ALL ITEMS WITH STARS
BUY 3 GET ONE FREE

-^L- (No Mixing) ^L

^ OFFER EXPIRES DEC. 31, 1981

•Sound Effects Kit $16.50*

The SE-01 Sound Effects Kit has all you need
to build a programmable sound effects
machine except a battery and speaker Only
the SE-01 provides you with additional
Circuitry that includes a Pulse Generator, Mux
Oscillator and Comparator to make more
complex sounds a snap, Includes T1 76477,
(w/specs) assembly instructions and
programming examples. You can easily create
Gunshot*, Explosions, Steam Trains, Wind &
Surl and much more
Complete Kit $18.50

With quality PC Board

{Less battery & spkr )
76477 Chip Is Included
Extra chips S3. 15 ea.

rfjje*/* Doomsday Alarm •

If you hart trouble sleeping and you would like
the rest of the neighborhood to share your mis-
ery then this little kit will be for you' There
ts no way lo accurately describe the unearthly
howls, screams and tones that come out of this
kit Four separate tone oscillators are mixed,
cancelled and stepped at a varying rate 10 Waits
of crazy sounds. A great fun kit or a practical
burglar alarm Complete with t*C board am* all
necessary components lea speaker, For 6-12
VDC. Q QC ORDER

KIT

See Special Fall Prices Below

PRICES GOOD THROUGH DEC. 31, 1981
SHOP EARLY FOR CHRISTMAS!

04-03

7 Watt Audio Amp Kit S5-9S

5MAU SINGLE MV&fttD lC AND COMPONENTS Fit ON A 7 ■ f PC
BOAftD lUNCLUDEDl flU*+S ON 12VDC GREAT FQfl ANY PflOJEC T THAT
NEEDS AN INEXPENSIVE AMP LESS THAN U* THO $ ft WATTS
COMPATIBLE WITH SE-Ol SOUND KIT

O v er volt age Protection Kit $6*95

Protect your t&pensitre equipment liom ovtrvoltage
conditions Every compute* snouW rtave one1 Wo*** wHh any
luatd DC pow tourca Irom 10 to 20 volts up to ?i amps

* ZULU II Clock Kit •

$19*95 LESS CASE

• 1/2' LED Readouts

• Quarts XTAL Time base

• Calendar

■ Unique NOX™ Circuit Will Display Readouts On
Handclap

• Q alter? Backup I oauery no: included)

• High QuiJity Drilled & Plaited PC Boards: Clear
instruction*

PLASTIC CASE WITH FRONT & REAR
PANELS FOR ZULU II $4.95.*

Stereo AMP/Power Supply Board

Tahei Ion* l«vtl audio and dtrrH B ijhm ^pctakm ON-
BOARD RflCliftCTfi Jrtfl filler Supply pOw«r tef AMP
AMD TUNER, VOLUME BALANCE

PLUG C OMf> AT Aff LE and T ONE SL i OE CON TOOLS

Willi TUNER

HE QUIRES I2VAC $Ik9§

JHANSFOHMKR AT 400 MA

(nol lutludfid^ tun O M L V

FtATUflf S m ly

TUNER ONLY

Super Music
Maker

REVISION 2

$1495

(Basic Kit)

POM *mi itKtuti* tHItf
iw*tc*€l or 270BROU

Now you can ptay hundred* of songs^usifirg I he 8u»ei Sup**
Hut* M**#r The unn lufum a single (•dory
programmed m>cro0roc**aof rC thai comes wiTM 20 pre-
programmed short tunes By adding I he additional PflQMS
(270S sg The system can be expanded lo play up to 1000
note* per PROM. Just m.ru a compact eteclronic

ihsfiymanl thai will play dozens, hundreds or even
thousands of selections of music The kn comes wiih all
•lee Ironic compcminli (lata the PROM), and a drilled,
plaled and screened PC Board which measures 4" x 4 V
The 7 wall amplifier section is on (he same PC board and
drives an 8 ohm speaker (nol included), rrom a whisper lo
ear spiiiimg. volume Smce the unii works on 1? VDC or 13
VAC*, vehicle or portable ooeraliori ts poss^hle WHal do
you 0*1 lor *24 »5? Everything but • tpMfcarf. frtrulomw.
caaa. swtlchev and MOM. Addilionai 2706 albums
COniammg popular Tunes are a va liable lor 115.00 each or
you can program your own PROMS using information
provided w>(h the *rt instrucltons Lists o* avatlabte PROM
albums are availahre on fequesl rAiore Unit pity*
tt+cifonic mtfStc one note era ttmw. if '3 nof possibte topiay
chords of a mBlQ&p wtth harmony untuti&neauiiy. )

• EnwHlope control gives decay to notes

* On board inverter allow* single voiiage (+12} operation

OPTIONAL ACCESSORIES

DIP Switch*! Ona a poS . One 5 pos 100 Set

{Can he directly toldefed to PC Bd to Access tuness

Rotary frurtteht Two 5 position 2.^0/tei

[For remote wiring to PC Bd to access tun«i

WaAeaug

(For operation on 11 TV AC house voltage)

Mft

Microprocessor Station Clock $49*95

The ZULU 3TZ is a full blown ROM and MICRO-
PROCESSOR unlike other standard clock ICs, it allows
exceptional flexibility. Almost a year in design, it is the
most advanced station clock on the market.

QUALITY SOLDER ZONE CHANGE
MASKED & SCREENED FEATURE

PC BOARDS MAKES Se,ect one of hree

ASSEMBLY A SNAP

Adjustable Brightness
,6" - High Intensity

Orange Led Readouts
Seconds Reset/Hold

provides easy

syncronization with

WVW

Quartz Crystal
Timebase and
Battery Backup

FALL SPECIALS:GOO0 THRU DEC. '81

1. Super Music Maker with case and two
5-DOsition rotarv switches $32.00

2. Super Music with one 2716 2K X 8 PROM
filled with over 50 selections of additional
music (>1500 notes) $32,00

3. The Whole Ball of Wax! f*2 + case and
switches. $39.95

$49.95

$79

Complme Kil

Including Case §

Wad plug XFMR

*Or 1I7VAC

Operation

Wired 6
i asted

1 2 Volts
AC or DC

World Time zones,

Local Time (12 Hr.

format) and TWO

24 hr, zones of

your choice

RFI Protected

ID FEATURE

LED Indicator lights

when activated

flashes at 10 min.

Different audio

tones at

8 and 9 min

* NO CO.D/t,

* SEND CHECK MO. OR CHARGE CARD NO.

* PHONE ORDERS ACCEPTED ON VISA AND MASTERCHABGE ONLY

* ADD 5% FOR SHIPPING.

* TX. RES. ADD 5% STATE SALES TAX,

* ALL FOREIGN ORDERS ADD 30% FOR SHIPPING CHARGES.
U S FUNDS ONLY,

(214) 278-3553

PS 14 REGULATOR CARD KIT

This is the Regulator Card from our famous
20A Power Supply KiL Although we ran out of
the transformers and heatsinks, many
customers have been able to locate their own.
The regulator card performs the actual
voltage regulation and has adjustable fold
back current limiting. Output voltage is stable
to 200MV from 0 to 20 Amps and adjustable
from 11 to 14 Volts. Designed to drive 2 high
current NPN transistors (2N3771 2N5301 or
equiv.) The unit assembles quickly. Included
are all the on board components including a
driver transistor and over-temp shutdown
sensor. Designed to screw down to a standard
3" diameter computer grade filter cap. The
quality plated PC card is 3-1/2'1 x 4 3/4",

WITH INSTRUCT iONS

REGULATOR CARD KIT

HIGH CURRENT PARTS

(2- 2N3772 & 25 A Bridge)

51,000 MFD @ 40V Computer Grade

$14.95

$5.00

$3.50

Requires Transformer with 16 - 19 VAC Out @ The
Current You Expect To Draw

• FM

• LINKS • REPEATERS • TRANSIT

• RECEIVERS • PREAMPS • CONV

• TRANSCEIVERS • POWER SUPPLIES

nusHinn! QUALITY VHF/UHF KITS

""s AT AFFORDABLE PRICES

FM-5 PC Board Kit -ONLY $159.95
complete with controls, heatsink, etc.

1 0 watts, 5 Channels, f or 6M , 2 Mr or 220

HIGH QUALITY FM MODULES FOR
REPEATERS, LINKS, TELEMETRY, ETC.

R75 VHF FM RECEIVER for 10M, 6M(
2M, 220, or commercial bands, 4 fantastic
sefectivity options. Kits from $84,95 to$1 1 9.95

R450 UHF FM RECEIVER for 360-520 MHz
bands. Kits in selectivity options from S94. 95

R110VHF AM RECEIVER Kftforvhf aircraft
band or ham bands. Only $84.95,

COR KITS With audio mixer and speaker
amplifier Only $29.95,

CWID KITS 158 bits, field programmable,
clean audio. Only $59,95.

A1 6 RF TIGHT BOX Deep drawn alum, case
with tight cover and no seams. 7x8x2 inches.
Only $1 8.00.

SCANNER CONVERTERS Copy 72*76,
1 35*1 44, 240-270, 400-420. or 806-894 MHz
bands on any scanner. Wired/tested Onty $79.96.

T51 VHF FM EXCITER for 10M. 6M. 2M,
220 MHz or adjacent bands. 2 Watts contin-
uous. Krts only $54.95.

T451 UHF FM EXCITER for 450 ham band
or adjacent Kits only $64.95.

VHF & UHF LINEAR AMPLl FIERS. Use on

either FM or SSS. Power levels from 1 0 to 45
Watts to go with exciters & xmtg converters,
KftS from $69-95.

VHF & UHF RECEIVER

-^ »^

PREAMPS. Low noise,

VHF & UHF TRANSMITTING CONVERTERS VHF & UHF RECEIVING CONVERTERS

For SSS, CW, ATVt FM, etc Available for 6MT 2M.
220f 440 with many IF input ranges, Converter board
Kit onfy at $79.95 (VHF) or S99.95 (UHF) or kits
complete with PA and cabinet as shown.

20 Models cover every practical rf and if range to
listen to SSBt FMt A7V, etc. on 6M> 2M, 220. 440, and
1 10 aircraft band. Even convert weather down to 2M(
Kits from $39,95 and wired units.

VHF Kits from 27 to 300 MHz. UHF
Kits from 300 to 650 MHz, Broadband
Kits: 20-650 MHz Prices start at
S14.95 (VHF) and ST8.95 (UHF). All
preamps and converters have noise
figure 2dBorless,

Call or Write for FREE CATALOG

(Send S2.00 or 5 IRC's for overseas MAILING)
Order by phone or mail • Add $2 S & H per order
(Electronic answering service evenings & weekends)
Use VISA, MASTERCARD, Check, or UPS COD.

mironics, inc.

65 Q MOUL RD. • HILTON NY 14468

Phone: 7 1 6-392-9430 *

Hamfroncci ' is a registered trademark

iyiiv :i, the first name in Counters !

MUCLSi

.III.

AC I AC Mtefnti

»P I N^id ^t i V

Adipuit'CMr^r

OV I Micrt' pffFir Orin

Lnnr hut

I in mil Lime tiiw Input

ICH U

II U
I' m

9 DIGITS 600 MHz

The CT 90 ti the most versatile, feature patted counter available for teas
than S3 00 .00' Advanced design feature* include three selectable Rate timev
nine digit*, gate indicator and a unique display hold function which boldv the
displayed count after the inpui signal is removed Also, 1 1 OmHz TCXO time
base is. used which enables easy zero beat calibration checks against WW V
Option ally; an inlemal mead battery pact extern a] n me base input and Micro-
power high stability crystal oven time base are available The CT-90,
performance you can count on!

$1 ?Q9*

wi** WIreD

SPECIFICATIONS

Range:

Sensitivity:

Resolution.

Display
Time base

Power

20 Hi to 600 MHz

Le« than 10 MV to 150 MHt

Lew than 50 MV to 500 MHr

0 1 He 1 10 MHz ranged

1,0 Hi (60 MHi range)

10 0 Hz (600 MHz range}

9 digits 0.4" LED

Standard- J 0.000 mHz, 1.0 ppm 20-40° C

Optional Micro- power ovan-0-1 ppm 20-40aC

8-15 VAC @ 250 ma

7 DIGITS 525 MHz

SPECIFICATIONS

Raxne
S«fuitj\itv~

Resolution:

Display
Time base
Power

20 Hi to 525 MHi

Let* than 50 MV to 1 50 MHz

Less than 1 50 MV to 500 MHi

1.0 Hj (5 MHz range)

10.0 Hi (50 MHt range}

LOO 0 Hi (500 MHz range)

7 digit* 0 4" L£D

1.0 pom TCXO 20-40° C

12 VAC ft 250 ma

WIRED

The CT-70 breaks the prsce bamer on lab quality frequency counter*
Deluxe features such u three frequency range*- each with pre- amplification,
dual selectable gate times, and gate activity indjcau on make measurements a
snap. The wide frequency range enables you to accurately measure signals
from audio thru UHF with I 0 ppro accuracy • that's .000 1%! The CT-70 ts
the answer to all your measurement needs, in the Field, lab or ham shack.

PRICES:

CT-70 wired I year'

CT 70 Kit. 90 day parts m

raoty

AC 1 AC adapter

BP-I Nicad pack + AC

adapter/charger

199.95

84,95
*.*5

12,95

PRICES:

7 DIGITS 500 MHz $7955

MINT LOO wtred, t year

warranty

179.95

AC-Z Ac adapter for MEN 1-

IQO

3,95

BP- Z Nicad pack and AC

adapter charger

1295

Here's a handy, general purpose counter thai provides moat counter
functions at an unbelievable price The MINI- 1 00 doean'i Have the Full
frequency range or mem impedance qualities found in higher price units, but
for basic RF signal measurements* it can't be beat? Accurate measurements
can he made from J MHt ill the way up to 500 MHi with excellent sensitivity
throughout toe range, and the two gate timet let you select the resolution
desired Add the mead pack option and the MINI- 100 makes an ideal arktitinn
to your tool box for "in- the- field' frequency checks and repairs;

WIRED

SPECIFICATIONS:

Scasitmtv-

Dispiayi

1 MHi to 500 MHz
Less than 25 MV
100 Hi (slow gate)
1 0 KHz ( fast gate}
7 digits. 0 4" LED

20 ppm 2<wrrc

5 VDC fe 200 ma

8 DIGITS 600 MHz $159

WIRED

SPECIFICATIONS:

iiie

Range:
Sensitivity:

Resolution;

Dw play-
time base
Power

20 Hi to 600 MHz

The CT-50 is a versatile lab bench counter that will measure up to600 MHz "HUfcat

Less than 25 mv to I 50 MHz wiLh 8 ^ predion. An^ om 0f jt* best features is the Receive Frequency CP50 ^^ ' year warranty SI 59.95

Less than 1 50 mv to 600 MHz
t0 Hz^60 MHi range]
10.0 Hi (600 MHz range)
8 digits 0.4" L£D
2.0 ppm 20-40' C
110 VAC or 12 VPC

Adapter, which rums the CT-50 into a digital readout for any receiver. The
adapter is easily programmed far any receiver and a simple connection to the
receiver's VFO is all that it required for use Adding the receiver adapter in no
way limits the operation of the CT-50, the adapter can be conveniently
switched on or ofT The CT-50, a counter that can work double- duty?

CT-50 Kit, 90 day parts
warranty

RA'L receiver adapter kit
RA-1 wired and pre- program-
med ( send copy of receiver

119.95
14.95

29 95

DIGITAL MULTIMETER $99^

i it lifc

WIRED

PRICES:

DM700 winat ! year warrant)

$99.95

DM700 Kit, 90 day parts

warranty

79.95

AC-I, AC adaptor

3,95

BP-3* Nicad pack +AC

adapter/ charger

19.95

MP- 1 , Probe kit

295

The DM -700 offers prafetekmil quality pcrtormance at ■ hobby tst price,
Fe*iuro include; 26 <iiffctmi ranges and 5 functions r all arranged in a
tnnvenic-ni. raav to use formal Mr*iuremcnts arc displayed ho * large JH
digit. 14 inch LED readout wrrh auionuTvc decimal piacemeni, automatic
polar irv, overtange indication and overload protection up to 1 2 50 volts on all
raftgro, m aid ng it virtually goo f-ptoo 11 The DM -700 looks great, u handsome,
}et black, ruKKcd ABS case with convenient retractable tilt hail makes it an
Ideal addition ro anv shop

SPECIFICATIONS:

DO AC volts: lOOuV to 3 KV, 5 ranges

DO AC

current

0.1 uA to 2.0 Amps, 5 ranges

Resistance:

0. 1 ohms to 20 Megohms, 6 ranges

Input

impedance

10 Megohms. DO AC volts

Accuracy:

0.1% basic DC volts

Power

4 "C cells

AUDIO SCALER

For high resolution audio measurements, multiplies
U P m frequency
» Great for PL toots

• Multiplies by 10 or 100

• 0.01 Hi resolution:

S29.95 Kit £39,95 Wired

ACCESSORIES

Telescopic whjp antenna - BNC plug.

High impedance probe, light loading

Low pas probe,, for audio measurements
Direct probe, general purpose usage ....
Tin bail for CT 70, 90. MINI 100
Color bum calibration unit calibrates counter
against color TV signal

........... . .

1495

COUNTER PREAMP

For mewuitmg. rmemcly weak signals from 10 to 1,000
M H ; SmaJ I ict. fxiw end by plug tr*n*iWmrt - rncEuded-

• Flat 25 db gain

• BNC Connectors

• Great for stuffing RF with rack- up loop

S34.95 Kit S44.95 Wind

vis*.

famsey etectronic's, inc. p_

2575 Baird Rd. Penfield. NY 14526

.-62

PHONE ORDERS
CALL 716-586-3950

• ■1u " lf> 0"»9'nP' i^'Wi '(>• =»lund Add b IftJ tTiippig

■niu'OTM* >oo tiQi 'i^uiT1 □< 1 ■ C 0««'itotadd M C OD add
I? Om*'i .f^ttf * ' 0 odd I ' *>& M''#*-4i«»i fldil? lai

222 73 Magazine * December, 1981

TOP QUALITY PARTS FOR LESS

Precision Hybrid
Oscillator Module

Has both 1 MHZ and 2 MHZ TTL -
outputs — Hermetically seated —
Ultra high stability over wide temp,
range — originally cost over $40 00
each — We made a super purchase
from a major computer manufacturer
— 5 VoJt operation - fits standard 24
pin socket - Manufactered by
Motorola oscillator division

NEO 2137 by NEC

• Microwave R.F. transistor (N.P.N.i

• Micromold package #37

• Dual Emitter leads
•FT to 4.5 GHZ

• VCEO 10V-CC 20 MA. HFE 40 200

• Gain10V'20MA-lGHZ = 14DB Typical

• Very low noise- High gain 1.5 DB
@ 500 MHZ

• Cleared for high reliability space
applications

COMPARE

MC6871A

CRYSTAL OSC
to MHz

MC6871A

3/20

750 M

f w/data

POWER SUPPLY
TRIPLE OUTPUT

25 Volts @ 18A
5 Volts @ ,8A
15 Volts @ 125A
Isolated independent

OUtpUtS

Positive or negative
operation

Constant Voltage Regu-
lation

25 Volt line adjustable
with 10 turn pot from
23.5 V to 28 Volts. 120
Volt - 60 Hz input Fused -
H=3tt" W=5V4" D=4"

LM117

An easy to use adjustable
Voltage Regulator - only two
external resistors needed to
set the output voltage - TO 3
Case - adjustable from 1.2
to 37V - Regulator is floating, so it can
be used in a wide variety of
applications, as long as the input to-
output differential voltage is 40V or less
- 1,5A output current - house numbered ■
prime- Motorola.

Video Game Board

Hockey ■ Tennis* Handban

• General Instruments AV3 8500

• Features Exciting Sounds

• On Screen Scoring

• 1 ot 2 Players
■ Speed 4 Paddle Controls

• Works on 9 VoOs D C

Each board comes with RF Modulator iCn 3
or 4\ and schematic The only parts needed to
complete game are speaker. 2 1 Meg Pots &
Switches

3 for 1 200

Transformer

32VCT® 1 amp *J25
6V @ 1 amp -j

Measures:

2"x2y*"x2V4"
2%" Mounting Centers

Micro Mini
Toggle Switch

W -

6 for 500

—'* SPDT • Made in USA
with Hardware

SCOTCH LOK

Great for connecting a wire to an
existing Wire without stripping Afcso
lijieiy invaluable in hard ro reac^ areas
such as under car dash inside
television, elc Simply put Scotch Lok
over enisling wire Inseri new wire to be
connected With a standard pair of
pliers, compress metal on insuialn* Ho
need for laps Super neat installation
Once you use ihis. you will never qo
back to the "old way TVV^

15/100 *&&

Video Paddle
Controls

2 fori

Can oe used with
game board at left

IC Specials

MC1488-1489 - RS232 Driver
and Receiver qqc

NE556-OualNE555

2/125

NE555

3/125or10/330

JFETOPAMP

Super High Input Impedance
(10'* OHMS) — High Frequen-
cy Response. TO 4 MHZ
Large DC Voltage Gam 106 DB
— New generation OP-AMP
with Vastly Superior Features!

LF356BH

>oo

Fixed Inductors

JOuh-6/1" 12.5 uh- 8/1 00
500 uh- Hash Filter

@2AmpS'4/1°°

Molded Choke

l3uh-W1W50mh.6/1M

Variable
Inductors

30*40 uh

,9uh-l.2uh

11 uh to 20 uh /

.25uh-,35uh
.85 uh ■ .95 uh

EIAJ#1SS98

NEC #498 1 -7 E
Microwave * Schottky

barrier diode

HP-Hot Carrier diodes
5082-2835

• It

o «r 6/500

UNIVERSAL

TIMER KIT

* Adjustable from 1 sec
to 1 hr

• Control up to 1 amp
'Turn Things On Or Off

Kit includes all parts
necessary to buiid this
exciting kit Uses: Children's
T.V. programs - Darkroom
exposures - Amateur 10 mm,
I.D.er - Egg Timer - Inter-
mittent Windshield Wiper
Absolutely endless uses.
Complete kit including
power supply, p.c board
DPDT relay, and all parts to
make timer operational

NEXT MONTH

MOHO

I > lu \v*m I i- ■ |Cl*il4l Ui m If) P S H

• VIS* • M ASTERCAH0 • AMERICAN EXPRESS «

The most exciting Item we have ever seen -

Digital Research: Parts

P.O. fen 401247 • Garland, T«ai 75040

(214) 271-2461

**Se* List of Advert t son on page 162

73 Magazine • December, 1981 223

INTRODUCING SONY'S NEW DIGITAL
A-^ DIRECT ACCESS RECEIVER!

L>>

only

$299

plus
$5.00

(NOW IN STOCK) shippin9

Oisr y

Revolutionary
Instant Access Digital
Shortwave Scanner

• Continuous Scanning of LW. MW, SW, & FM Bands

• Instant Fingertip Tuning— No More Knobs!

• 6 Memories for Any Mode (AM.SSB/CW. & FM)
■ Dual PLL Frequency Synthesized— No Drift?

A WHOLE NEW BREED OF RADIO IS HERE NOW! No other
shod wave receiver combines so many advanced feaiyres for
both operating convenience and high performance as does the
new Sony ICF-2001. Once you have Operated this exciting new
radio, you'll be spoiled forever' Direct access tuning eliminates
conventional tuning Knobs and dials with a convenient digital
Keyboard and Liquid Crystal Display (LCD) for accurate frequerv
cy readout to within 1 KHz, Instant fingertip tuning, up to 8
memory presets, and continuous scanning features make the
ICF-2001 the ultimate in convenience.

Compare the following features against any receiver currently
available and you will have to agree that the Sony ICF 2001 is the
best value In shortwave receivers today:

DUAL PLL SYNTHESIZER CIRCUITRY covers entire 150 KHz to
29,999 MHz band PLLt ctrcuil has 100 KHz step while PLL2
handles 1 KHz step, boih of which are controlled by separate
quartz crystal oscillators for precise, no-drift tuning DUAL CON*
VERSION SUPERHETERODYNE circuitry assures superior AM
reception and high image rejection characteristics The 10,7 MHz
IF of the FM band is utilized as the 2nd IF of the AM band. A new
type of crystal filter made especially lor this purpose realizes
clearer reception than commonly used ceramic filters ALL FET
FRONT END for high sensitivity and interference rejection, Inter-
modulation, cross modulation, and spurious interference are ef-
fectively rejected. FET RF AMP contributes to superior image re-
jection, high sensitivity, and good signal to noise ratio, Soth
strong and weak stations are received with minimal distortion

EXTENDED SPECTRUM CONTINUOUS TUNING

AM
50 to 29,999 KHz

■***

.HA.

LUO&

A Enter Button
B Signal Strength

Indicator
C Liquid Crystal Display
D Memory Preset Buttons
jE Antenna Adjustment

Dial

F SSB/CW Compensator

Q Execute Bar

H Manual Tuning Buttons

I Scan Button

J High/Low Limit Buttons

OPERATIONAL FEATURES
INSTANT FINGERTIP TUNING with the calculator-type key board
enables the operator to have instant access to any frequency in
the LW, MW, SW, and FM bands. And the LCD digital frequency
display confirms the exact, drift-free signal being received.
AUTOMATIC SCANNING of the above bands. Continuous
scanning of any desired portion of the band is achieved by
setting the "L, " and "Lj" keys to define the range to be scanned.
The scanner can stop automatically on strong signals, or it can
be done manually. MANUAL SEARCH ts similar to the manual
scan mode and is useful for quick signal searching. The "UP"
and "DOWN" keys let the tuner search for you. The "FAST" key
increases the search rale tor taster signal detection MEMORY
PRESETS, Six memory keys hold desired stations for instant
one-key tuning m any mode (AM, SSB/CW, and FM), and also, the
"L{* and MLg" keys can give you two more memory Slots when
not used lor scanning. OTHER FEATURES: Local, normal, DX
sensitivity selector lor AM; SSB/CW compensator; 90 min. steep
timer; AM Ant. Adjust.

SPECIFICATIONS
CIRCUIT SYSTEM: Fm Superheterodyne; AM Dual conversion
superheterodyne. SIGNAL CIRCUITRY: 4 ICs, 11 FET's, 23
Transistors, 16 Diodes. AUXILIARY CIRCUITRY: 5 lC+St 1 LSI, 5
LED's, 25 Transistors, 9 Diodes, FREQUENCY RANGE: FM
76-108 MHz, AM 150-29.999 KHz. INTERMEDIATE FREQUENCY:
FM 10.7 MHz ; AM 1st 66.35 MHz.. 2nd 10.7 MH2, ANTENNAS: FM
telescopic, ext ant. terminal: AM telescopic, built-in ferrite bar.
ext ant terminal POWER: 4 5 VDCH20 VAC DIMENSIONS: 12%
(W) X 2 V* (H» X 6*i (0) WEIGHT: 3 lb. 15 oz. {IJi kg)

Clock Modules MICROPROCESSOR COMPONENTS

12V DC

AUTOMOTIVE/

INSTRUMENT

CLOCK

APPLICATIONS:
■ In-dath autDclOcM

* AMprm|.|.«1 lulD,-'
RU tlOtPi

marina elk*.

p0 Mt*t>4 A'bat tary
po*»*rad MllUumHlt
Faatu'ti B*>gni 0,3" jjr**n dupl**. Infernal cryitaE tiffi#-
b*w 1 0 5 tat r'dty trar. Auto, dtjplwv br igh tntrts ee n trcH
tooac. Ditpiay color f iltftfvbl* to blue, hjinnjraan. or«n &
v#tJ<o%%. Compla**— jui* *dd twitch** and imi

MA1Q03 Module um" ul^-h* ja-oi ■ $16.95

CLOCK MODULES

JUIA1023 .7" Had Digital LEG ClOcK Module
MAI 026 . 1" Dlfl LED Alpim Oock/TherinDmalir
MA 5036 ,3J1 Rid Digits LED ClOcfc/Trmar
MA1Q02 .5" 6*d Digit** LED Clock A Xformar
MAlOfD 8 Rtd Diflita' LCD Clock
MA1033 CBA J" CN#IUi LCD Cl*Kk
MA1043 .7" Qnv) D>#t1«. L« D Clock

8,95

IB. 96
5,95
9.95
3.95

17 95
B.95

1 02 P30 Xtormw fvUA 1 Q23 1 043 & 50 3* Wool 3*9
102-^22 Xtorrwiw for MA102» C«OC* WoCul** 3.49

102 f*24 Hiotmm for MAlOtO Ctock Moduin 3 49

80SDA7N«A SUPPORT DEVICES

■a*. cr»u

I J-eil Inmal/OUTDUt.

1 PTlOltbj >1t*iPilpi Control

I fllDliBtltlEiUII Bui DrltfH

1 ClfKh QtMraiOt/OtlW

I Bctf Of n*»

I t«Vfl*m C«r*U [■■>*',-> J" Din^u

I 5y"MB*"< CotlrBtpBr

*J Ml I«tl*lt* la* ■ 3*J an

I *t *■». C»ww J^3 tt/lAOTI

s.w

Ml
i«
*-*

<?££2*ri Sun Power Vow/ Electronics!
<£S5^ SOLAR CELL PANEL KIT

Niturtv;

* Output: lGVDC, 10 IHfflA In S*fl#»

fiV DC. la »OmA In Parallel

• PataU nuy b* aaalr* eonnacttd lor

or PiriW eti1

II ■ I I I I

1dailH*Hi *i~0

TTw JEM low C*ii Pan**" KM COn<aW* 2D mc* tote* cafl*. Oh Mw
panal DOM1 OT f>Olf*r lifM lap* whatl! *HO* Uat u**V 10 p*4*<t rtftaOBt

iun* taru$a >i $ U.n*l frpm » 5V0C In IflVOC Th* appJh=*tlon» of a«h
p*n*l can bd fur Ihw *ipind*d by eoupHrnj additional paneli In sanea
tar mar* vDlkaa* cm In parallel for man currant The praynlurn (fade
talar call* provide lha currant riaceteary lor tha operallon ol most po*
labia liamlelc" radios, small biliary powered taitntl* la.p* bl*r*r*
and unlimttid gpfwrimfinlii aalaj projittlt.

JE305

» 4 # i r w

.$39.95

EPROM Erasing Lamp

- ErHH 2708, 2716. 1702A. 52030, 6204a «»■

* Efiaac up to < ctiipi, within 20 minutti.

» Mtintsini conttint utpoiur* ditiartca at ona inch.

* Rpoclil 0onductrw« fo»m I jn»r*liminaianiai^ buildup.
« BuiIMn lafatv lock to prtVOflt UV vxpooir*

* CoiBfWrt - onlv 7 6/ft M n 2 7/B" * T

* CotnplMa wrth holding triv tot 4 cripi
LfVS-IIEL R«pUoain«nt ftulb , . ll«JH

UVS-11E

- - ■ ■

• * • •

i 2> /y.y o

JOYSTICKS

iS-SK

iy-KI*«l TliMlA« ^J*m«ni

fc-an ai Cmpk^oasi am*"**
i an at Di-ittmin nacaitw
l-ail ■I'QHtHHS-nii fl«E«Lvaf
oclil LjIchaiJ P*riph*ral CklvH
Ocljt Lilcnad Pvrtpharal Oi#ir

DATA

MnamcN
APCtUiCCN

CiAClOWLCK

PAciawutN

QACWTLCN
QACU2fL.CN
eOMIN

ACOUIS1TION (CONTIWUEDJ—
t-an VQCMXfitr is-cfi. mjih ]

I. Bit ft/D Ganif»rlir lll-Cn Mi«l|| ]
J* BIT C/ A COrt*, M^JQ t»mp. 19 .flM* I
IL>nil D/MCtnv, MtCTCi. CQmo. « UPth
*»-BH«/4 Cpnwin*! ftua> LJn. |
Jt-HMQ/ACgqwItl |t Wl 4-m I

» BUO/A CWMTter Jfi-Brh U*.j
«-Ciu»PiM#i l*uPtiBrib»ur
■M BAUb UAAT
MAArlS

Iftaj
11W

5-»

t«

&BO0:BB00 SUPPORT DEVICES

PpBPU
V aunj -«h c*»ct ,

tj*

■ CM II

■ e
Mi

VCI

J-li) »l-*f*B««. Tf*BHMCiTll|

MICROfflOCESSOH CHIPS

1HIHK1 CPU [M*B*r*l <JMHi|

^«3 * r raj. t] CPu [Vii* aidhrm t* MH: i

COPWI CPU

MU mi'" '

nMflaiAoc cPu 4-BiraiicilCan. TMAa.Qraai)
MCMatt UPU -.'Clef* |HK Bvlai MvpvKBrrJ

1 1 1 (aaai 1 1 wajh-hi nwn-uj]

C*tr- Sat- c*ip HB« f i» *» »•» * ***i
C*U Wbw RAVI
cai>"«i hw »*»•
CPW -

Tujaaai-.

SHIFT REGISTERS

I. .VI

L*.»
»,»
Lt.H
Ll.Br
TrB
IJI

DvM H-tn Pt"**<
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See List of Advertisers on page 162

73 Magazine • December, 1981 225

<DEflLS)
^DIRECTORY

Phoenix AZ

The Southwqt'i mat prop —I in communica-
tions rornnanv nicking Km* rod, I com.
Taaau. MR HiSS \ Astm. Limit. Cmfacrmft.
Hy.Cain Bnmi and mm. Would like to
serve juti! Po*rf Canumanaoatkins Corp.. I MO
West CamcJbaca Rd.. flmmi AZ S3015.
241-Witt,

Culver City CA

Jun\ Hertfntiici, 3Q195qpuKeda Blvd.* Coh*f
City CA WE». 3904001 Tr*d« 4fi& iM&San
Diep* Call in for ■ kr» ipiute

FonUnaCA

■ ICOM.

New fmfti iwily factor, iulhontrd (COM
and YAESV distributor Lsrg? imeniory of isn*
and used tpecials Mot oruj-nr brands in nock
Complete \*tyic* and xariiititi Raditn
tnurnitad* 1760 E*&m Avenue, P.O. Bat 347.
Stmwl NJ 08S73. 4GS-1599

Amsterdam NY
UPSTATE NEW YORK

Kenwood. (COM. Drake. ptu» mam uiher
ism's Amateur Dealer iWi7vrr35<i?an Adinm-
d*c» FUdin Supph . Inc., 1*5 Wat Main Street.
Amsterdam NT 13010. S42-8350.

Tm-Tc

Compart* lino ICOM. BenTran.
Mirage, Cofaic, Lunar, wrr 4000 .
pTuductx for hobbyist, technician, ripen-
mentrr Ai» CB radio. Landroobilr Fanlana
Elcctnna. 862S 9cm A**.. Fmlioi CA
92335. «St-TTlf).

SulcneCA

SAN FRANCISCO BAY AREA

HwrielHPe»taV rmt-vft- torn of ne* and used
Hani Computer eeai and mcr.jxmrrns Srmng
Harm t»no- |"5fi Wr cprc-ialur in ICOM.
KIM. Mirage. Com pt rutin. Wr sJiiij ttorld-
u,ide Trie-Corn Electronic*. 1*4*0 I'nion
Avenue. San foat CA *S124. 377-4479.

San Jaw CA

Ba> area's nrhist Amateur Radio store New &
used Amateur Radio aaks & rervkc. We feature
Krnwtaid. ICOM. Artim, Yme»j. Ten-Tec*
Santo. At m*nv mtn* Shaver Radio. |m., 1371
So BanumA^.. San Joat CA 96 Itt, 99^1103.

Denver CO

Eipcrlmmicr t para dual Electronic and
mechanical component* fot campuLrr people.
flu dm |N»!|iU -. harm, r«boi hulldt-rv nprn
[Tn*nu»rs Open yn dayi ■ wwii Gateway Dee-
Ironies Corp., 2RJ9 W. 44th Ave.. Denver CO
*0Ell,45fl-5444.

Central NY

Amateur radio hardvn ■ d display made hnnur
H*nfirat**R ^calkrgnv plague*, awards or
fjxcial order*. High qualm, fast tcrvtce. km
pwa A.&M. Wandavrr, 3l3 N. Madison St..
PO. Ben 343. Rome M 13440, 337-5642.

Syracuse-Rome-Utica NY

FeBtimrtK- Kenwood. Yaau, ICOM. Drake,
TenTflc. Sw an. IVflTfoiL Alpha, Robot. MF1
Tempo, Astroo, KLM. Hv Gain, Modes.
Lam. tWxraft . Hustler, Mini Products. You
won't be disappointed with erruipment urr\xe
Radio World, Oneida Countv Airporl -Termi-
nal BuikUng. Oriskanv NT I34H, 537-0303.

(Columbus OH

Hv bteeect and best Ham Strae in tne rnirJwcat
featuring quality Kenwood product*, with
working dispLayv We aril onh the best.
Authorised Kenwood Suivkw Universal
Amitrur Radio Inc. \2hii Aida Dr..
Hcvoold&huTff [Columhus> OH 4306A

MMat7.

Miami FL

Amateur Radio Oniir. Inc, "Kvervlhing (nr
the Ainateur" Since IBflO. SSOS U.K. 2nd
A i en ue, Miami FL 33! 37, 573-S383. TWX
529035.

Seranton PA

[COM. Bird. CushCraft. Bot-kman, Fluke.
Larsen. HiutW, Antenna Sntciiilistv. Asirtm
Avjuiti, Belden, W2AU/W?2VS, CDE. Ar^A,
Vibroplra, Ham-Ke>\ CESP Amphem4, Sonv.
I-' iH luii < ."mmr r. BkW. Amwo, Shun\ Laftue
Eleclronks, 11 12 Grand *icw St.. Scrantim PA
IS50B, 343-2124.

Smyrna GA

Fcif your Kenwood. Va«u, J COM, Drake and
other ii iim tni r necri*k conu" u, m ils, Brill's
Two-W.v Ilurlto. 2M6 N. Atlanta Rd.h Smyrna

<;a MM. M2-mw.

Houston TX

Kxperi menter V puradisvl Hlectronk? and itiu-
rhanicai compiinents fur cinnput^r [wople,
audit} |KHipJck hanw, robot liiLjldcr%, cxperi-
manteta, Opii six dav* a week. Gateway Elfc-
Ironles Inc., B»32 Clprkcnsl. Houiton TX
77063. H7^-B575.

Preston ID

Boh WBTBVZ, has the Urgrat Stick of Ama
teur Gear In thr tutermmintajn Wesl and the
Best Prices. Gal J mi- lor all nmr huai wwb.
BtKs DiitHhiilinK, 7« So, State, Preston ID
S32E3. N.i2-(WJ0.

San Antonio TX

Terre Haute IN

Your ham hradiwattcn located In the heart of
the midwert Hooiier Electronics, Iik , |9
Meadows Center, P.O. Bot 3300. Trrre Haute
IN 47JMI03. 23*- 14J»,

(Aiiiiultrti* 2 way service shop. Call Dee,
W5FSP. St-llinji Antenna SpeciaUsU. AvunH,
Ajfiden. Bird, Hv-ftain. Standard, Vibmpti-x.
Midlmd, Henn, CunhCraft, Dielectric,
Huvt|erP ICOM. MR, Nye, Shore, Cubic.
T«p, Ten-Ttc and utnerv Appliance At
Gqiupment Co., Inc., 3317 Vance Jackson
Road, San Antonio TX 71213, 734-7793,

Littleton MA

Thr ham tforc of NX. you can reJv on. Km
wood, ICOM, WOton, f aaw. Denfron, KIM
amps. B&U iwitchea *r * at I meter* , Wrustka
radar rletiirhm. Bearcat + Reaency. antennas bv
Lawn, Wilson. Huttkr, CAM TEL-COM
Inc. OMnmunk-at^Kis & tl«ifnnici. 673 Great
Rd., R1 lift, Urtieion MA 01480. 4A6-3040

Vienna VA

Tbs- \\ KihmK*on metropolitan area's leading
fupptfcrr of iha latest in Amateur Radio * nd Test
Ecpupment On your nc&l trip to the Nation" v
Capital f vtop rn and see us.. Elect rmic Equip-
ment Bank. St*.. 51ft Mill Si. N.E., Vlema VA
S2180. 93fl-3350.

Hudson NH

New Enajantj * Dntribotrrr and Authorized Ser
Mce Center for all M#j<ir Amateur Lines Tufts
Radio Electronics. Inc., 61 Lowell Road. Hud-
mn NH 03051. 8S3-50Q&

Casper WY

Servtn* Wyoming Hams with iots of good stuff
like Gallbook. antenna parts, ipeciaLt and
bargains. Witly and Larry Dean invite you to
drop in anytime. Radio Artrnr+. S31 W.Coilau
Dr., Casper WT 83601. 837-5146

Ann Arbor MI

See us For products hie Ten- Tec, R. L Drake,
Drntrun mod mans, more Open Mondav
throtinri Saturday, u«30 id 1730 WB&VCfi
WBSl^O, WDSOKN and WgRP behind the
eonntrr Purchase RadioSupplv, 327 E. Hoover
A%e.« Ann Arbor Ml 4A104

Charlotte NC

Santec. Hy-Cain, Cubic Comnv. liiHiim
Special rtls. Witecm. W2AUW2VS, BAW.
Palhcofn. Nse Viking Eketra. MFJ, Bash. CO.
AttI.. Arneco. Callhonk Smice, Salet Neu &r
Refurbished Home-Tronic*. 1217 Plata,
t nartotte NC 282QS, 334-7V74,

DEALERS

Your company name and message
can con tain up to 25 worth Jar as til-
th as $150 tjearly (prepaid), or $15
per month (prepaid quarterly}. So
mention of mail-order business or
area code permitted. Directory text
and payment must reach us 60 days
in advance of publication , For ex-
ample, advertising for the February
'82 issue must be in our hands by
December 1st. Mail to 73 Mag-
azine. Peterborough NH 03458.
ATTN: Nancy C tarn pa.

226 73 Magazine • December 1981

PROPAGATION

J, H. Nelson
4 Plymouth Dr.
Whiting NJ 08759

EASTERN UNITED STATES TO

GMT

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First letter = day waves Second = night waves
A = Next higher frequency may also be useful
B ■ Difficult circuit this period F = Fair G = Good
P = Poor * = Chance of solar flares; # m of aurora

SUN

MON

DECEMBER

TUE WED THJ

FFI

SAT

G/G

G/F

G/F*

F/F*

G/F

0/6

G/G

6/F

F/F

G/F

G/G

F/F'

F/P*

G/P

G/G

G/F

G/G

G/F

F/F

THE EVOLUTION OF A CHAMPION !

FT-101ZD Mk III

The FT-101ZD Mk III is the latest chapter in the success story of the FT-101 line.
Armed with new audio filtering for even better selectivity, the FT-101 ZD now
includes provision for an optional FM or AM unit. Compare features and you'll see
why active operators everywhere are upgrading to Yaesu!

Variable IF Bandwidth

Using two 8 -pole filters in the IF, Yaesu' s pioneering variable band-
width system provides continuous control over the width of the IF
passband — from 2.4 kHz down to 300 Hi — without the short-
comings of single-filter IF shift schemes. No need to buy separate
filters for 1.8 kHz, 1.5 kHz, etc.

Improved Receiver Selectivity

New on the FT-101 ZO Mk III is a high-performance audio peak/notch
fitter. Use the peak fitter for single-signal CW reception or choose the
notch filter for nulling out annoying carriers or interfering CW signals.
In the CW mode, you can choose between the 2.4 kHz SS8 fitter and
an optional CW filter (600 or 350 Hz) from the mode switch.

Diode Ring Front End

The FT-1Q1ZD now sports a high-level diode ring mixer in the front
end. This type of mixer, well known for its strong signal performance,
is your assurance of maximum protection from intermod problems on
today's crowded bands,

WARC Bands Factory Installed

The FT-101 ZD Mk 111 comes equipped with factory installation of the
new 10, 16p and 24 MHz bands recently assigned to the Amateur
Service at WARC. In the meantime, use the 1 0 MHz band for monitor-
ing of WWV!

RF Speech Processor

Not an additional-cost option, the FT-101 ZD RF speech processor
provides a significant increase in average SS6 power output, for
added punch in those heavy DX pile-ups. The optimum processor
level is easily set via a front panel control.

Worldwide Power Capability

Every FT-101 ZD comes equipped with a mufti-tap power transformer,
which can be easily modified from the stock 117 VAC to 100/110/200/
220/234 VAC in minutes. A DC-DC converter is available as an option
for mobile or battery operation.

Convenience Features

Designed fundamentally as a high-performance SSB and CW trans-
ceiver, the FT-101 ZD includes buift-in VOX, CW sidetone. semi-
break -in T/ft control on CW. slow-fast-off AGC selection, level
controls for the noise blanker and speech processor, and offset tuning
for both transmit and receive. The Mk 111 optional FM unit may be used
for 10 meter FM operation, or choose the optional AM unit for WWV
reception or VHF AM work through a transverter (AM and FM units
may not both be installed in a single transceiver).

Full Line of Accessories

See your Yaesu dealer for a demonstration of the top performance
accessories for the FT-101 ZDt such as the FV-101Z External VFO,
SP-9D1P Speaker/Patch, YR-901 CW/RTTY Reader, FC-902 Antenna
Tuner, and the FTV-901R VHF/UHF Transverter. Watch for the
upcoming FV-101DM Digital Memory VFO, with keyboard frequency
entry and scanning in 10 Hz steps!

Nationwide Service Network

During the warranty period, the Authorized Yaesu Dealer from whom
you purchased your equipment provides prompt attention to your
warranty needs. For long-term servicing after the warranty period,
Yaesu is proud to maintain two fully-equipped service centers, one in
Cincinnati for our Eastern customers and one in the Los Angeles area
for those on the West Coast.

Note: A limited quantity of the earlier FT-101ZD (with AM as standard feature) is stilt available. See your Yaesu dealer. FT-101ZD Mk
designates transceivers bearing serial #240001 and up, with APF/Motch filter built in and AM/FM units optional-

651

Price And Specifications Subject To
Change Without Notice Or Obligation

*^S3

The radio.

YAfSU

YAESU ELECTRONICS CORP., 6851 Walthall Way, Paramount, CA 90723 • (213) 633-4007
YAESU Eastern Service Ctr., 9612 Princeton-Glendale Rd., Cincinnati, OH 45246 • (513) 874-3100

MIC-SHCAR AF GJuW-9-RF GAIN

' U J? * r n

SSS TRANSCEIVER TS-130S

CAt Q'j

-RlT-®h IF SHIFT

SEND

MODE

cw S?B nev

BAND

POWEH

NAN AMTT *• *

Processor, N/W switch, IF shift, DFC option

Ad incredibly compact, full-featured, all
solid-state HF SSB/CW transceiver for
both mobile and fixed operation. It
covers 3.5 to 29.7 MHz (including the
three new Amateur bands!) and is
loaded with optimum operating features
such as digital display, IF shift, speech
processor, narrow/ wide filter selection
(on both S5B and CW), and optional
DFC- 230 digital frequency controller*
The TS-130S runs high power and the
TS-130V is a low power version for QRP,

TS 130 SERIES FEATURES!

• 80-10 meters, including three new bands

' overs all Amateur bands from 3.5 to
29,7 MHz, including the new 10. 18. and

t-MHz bands. Receives WWV on 10
MHz. VFO covers more than 50 kHz
above and below each 500-kHz band.

• Two power versions... easy operation
TS-1305 runs 200 IV PEPj 160 W DC
Input on 180-15 meters and 160 W 1'E
140 W DC on 12 and 10 meters. TS-13QV
runs 25 W PEP 20 W DC input on all
bunds. Solid-state. Wideband final
amplifier eliminates transmitter Lunim
and receiver wideband RF amplifiers
elimlnaic |> re se lector peaking.

• CW narrow/ wide selection

"N -VV" switch allows selection o! wide
and narrow band widths. Wide CW and

SSB band widths are ih« same Optional
YK-SSC (500 H ir YK -88CN (270 Hz}
filter may be Installed for narrow CW

• Built-in speech processor
Increases audio punch and average SSB
output power, while suppressing sid<
band splai

• SSB narrow selection

W" switch allows selection of narrow
SSB bandwidth to eliminate QRM. when
iptlonal YK 88SN (1.8 kHz) filter Is
installed, (CW Kter may still be selected
in cw mode J

■ Sideband mode selected automatically

LSB is selected on 40 meters and below,
and USB on 30 meters and above. SSB
REVERSE position on MODE switch.
Butlt-in digital display
Six -digit green fluorescent rube display
Indicates actual operating frequency
to 100 Hz. Also indicates external VFO
or fixed-channel frequency. RIT shift,
and CW transmit receive shifts. Backed
up bv an analog subdlal ,

• IF shift

Allows IF passband to be moved away
from interfering signals and sideband
splatter

• Built-in RF attenuator

For optimum rejection of Interniodulatlon
distortion.

• Single-conversion FLL system
Improves stability as well as
transmit and receive spurious
characteristics

Built-in VOX

r cot t v en lent SSB operation, as well
as scmlbreak-ln CW with sldetone.
Effective noise blanker
Eliminates pulse-type interference such
as Ignition noise.

Compact and lightweight

Measures only 3-3 4 inches high. 91/2
inches wide, and 11-9/16 inches deep, and
weighs only 12.3 pounds.

Optional DFC-230 Digital Frequency
Controller

Allows frequency control in 20-Hz steps
with UP ''DOWN microphone (supplied
with DFC-230L Includes four memorlr
(handv Tor split-frequency operation]
and digital display* Covers 100 kHz
above and below each 500-kllz band.
Vcry com pari.

Matching accessories for fixed station operation:
PS-30 base-Station jiinvtr • SP 120 external speaker

supply (remotely switch • VFO- 120 remote VFO

on and off with TS-I30S • MC-50 5QkO_ 5QQQ desk

power switch). microphone

Other accessories not shown:

More information on the T5-130 Series Is
available from all authorized dealers of

» Trio-Ken wood Communications
till West Walnut Street. Compton.
California 90220.

KENWOOD

, . , pari setter in amateur radio

• YK 8SC 1500 H/i and YK-88CN
(270 Hz) CW fitir;

• YK 885N (1.8 kHzl narrow
SSB llller

• AT -130 compact antenna tuner
180-10 m, Including 3 new

bands)

• MR 100 mobile mounting brocket

• MC 305 vitid M< 35S noise
cancelling hand ti iter op hones

■ PC-1 phone p.ilch

• TL-922 A linear amplifier

• MS 5 and HS 4 headphone**

• HC-10 world digital clock

• PS 20 base-station power
supply for TS- 130V

• SP 40 compact mobile
speaker

• VFO- 230 digital VFO with i
memories

Specifications and prices are subject fo change without notice or obligation,

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Full text of "73 Magazine (December 1981)"

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