International Edition
Sargain
SasGment
Signal
Monitor
>age 20
Masada!
*age 94
Microwave
l^ourself
>age 42
Mobile
^iplashes
^age 56
nside Dayton
*age 10
Europe on
^0 a Day
^age 48
rhe Saga
)f Ishmod
'age 64
0 4
1
i
74470 6*
5946
April 1984 $2.50
Issue #283
Amateur Radio's
lechnical Journal
i A Wayne Green Publication
Doing It at Dayton
This unoffitial Hamvention handbook helps
attendees and dreamers alike, ... WA4BPI
Me and My Stupid
Old PMOS Converter
At last, there's an easy way to get —12
V from a +5-V supply. Whd said "trial
and error'7 WB1 HKU/6
Watch That Signal!
10
K
14
yri Haul out your ofd oscilloscope and
turn it into a signal monitor. The con-
version is easy and the price is right
W4RNL 20
Digital Design:
How to Interface ICs
T Connect ICs io the outside wo Hd with
these hints from the author of "Digitaf
K4IPV
K
Basics
30
Emulate an EPROM Elephant
The portable RAM-faker never forgets.
Well, hardly ever McCarthy 40
^
Crystal Microwave
"Easedropping" on this part of the
spectrum is up to you, Here is a simple
waytostart WA4WDL
Take a Trip to Europe
These tips from the world's top SWL make it
possible Peterson
Four Bands, One Whip
Quadruple your mobile operating plea-
sure, please, but don't blame us,
K30F
42
48
\
56
Sun Fun— 100
The Con log Solution
\iA Whaf s the key to winning contests?
^**' Put an Atari and this program at the
helm of your station and find out.
N5ATD
Ish mod's Journal
What happened in 1963 finally surfaced in
1983. Was he a fool? , . , Whipple
The Terminal Terminal Unit
Build this variable-shift TU. Its perfor-
mance will knock you dead. .
62
64
^l
K3PUR 70
Wheeling and Dealing
with Preamps
For a switch, from the remote hills of
West Virginia comes a great antenna
, WBPMS 84
\
idea.
How to Have a Sunny Field Day
when Michigan hams turned to solar power,
they got more than they bargained for. Does
success mean anything? W8YZ 100
Painless Op- Amp Filter Design
Custom applications can be easy. Just
H
follow this step-by-step guide to a per-
fect triple op-amp filter. .,.. .W4RNL 102
Dayton Doings— 10
Never Say Die— -6
73 International— 92
Ham Help-
US, 116, 132, 133
New Products— 116
RTTY Loop— 118
Contests— 119
DX--120
Social Events — 122
Fun!— 124
FCC— 125
Letters— 127
Dr. Digital— 128
Review— 129
Reader Service- 130
Barter *N* Buy— 131
Awards— 132
Satellites— 133
Dealer Directory— 162
Propagation— 162
■
■f.. VlilfF'*
p«|%.Vf^T|'%„FK
' KVI
Ur
DEIAY
■
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-NB I
Ik
f \€ t J. t
FAST COMP
1 ,SLOW ALC^ I
SWR-
L
*li
COM ar i3UHftciErTSB ic:
HtCEIVL
U,v
l/gthJ£HAl SE^UCH MOPt-S SCAN
PHONES AF GAIN €> ftF CAIN SQuaCH ^ TONfE MIC GAIN -0- ftf fWR
*v^^
!COM Is proud to announce
the most pdvonced amateur
transceiver In communrcations
history. Based on ICOM's
proven high technoiogy and
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designs, the iC-751 is a
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ham band transmitter, thot
covers all the new WARC bands.
And with the optional internal
AC power supply, it becomes
one compact, portabte/field
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R»ceivor Utilizing an fCOM
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The 70,4516MHz first IF virtually
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eilrriinate the woodpecker )<
audio tone control, plus RIT with
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In the presence of strong QRM or
high noise levels. A low noise
receiver preamp provides
exceptional reception sensitivity
OS required.
Traiismttter. The transmitter
features htgh reliability 2SC2904
transistors in a low IMD (-38dB @
100WX full 100% duty cycle
(Internol cooling fan standard),
12 voit DC design- Quiet reJay
seJectfon of transmitter IPPs.
transmit audio tone control
monitor circuit (to monitor your
own CW or SSB signal), X1T, and
a high performance speech
processor enhonce the IC-751
transmitter's operation For the
CW operator, semi break- in or
full QSK Is provided for smooth,
fast br©al<-in l<eying.
Dual Dual VFOs
controlled by a large tuning
knob provide easy access to
spilt frequencies used in DX
operation, Normal tuning rate is
in 10Hz Increments and
Increasing the speed of rotation
of the main tuning knob shifts
the tuning to 50Hz Increments
automatically Pushing the
tuning speed button gives IKHz
tuning, Digital outputs ore
available for computer control of
the transceiver frequency and
funct^onSn and for a synthesized
voice frequency readout.
32 Memories. Thirty-two
tunable memories are provided
to store mode, VFO, and
frequency, and the CPU is
backed by an internal lithium
memory backup battery to
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seven years. Scanning of
frequencies, memories and
bands are possible from the unit,
or from the ]C'HM12 scanning
microphona In the Mode S
mode, only those memories with
a particular mode are scanned;
others are bypassed, Data may
be transferred between VFO's^
from VFO to memories, or from
memories to VFO,
Stondord Foafiir#»« All of
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high shape factor FL44A 455KHz
SSB filter, full function metering.
SSB and FM squelch, convenient
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white, and other functions in
white or red, moke the IC-751
your best choice for a superior
grade HF base transceiver.
Options. Externol frequency
controller, extemoi ^C-PS15
power supply, voice synthesizer.
computer interface, internal C-
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reference crystal (fess than
tlOHz after 1 hour). IC-HM12
hand mic. desk mic. filter
options:
SSB: FL-70
CWN: FL-62A, FL-53A.
FL-32, FL-63
AM: FL-33
r
ICOM
The World System
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751 1 $4
ARI
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KENWOOD
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t ■»
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3) MA -4000 Duo-band
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NEW!
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IC-02AT IC-04AT
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LM-470D
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Msm
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B-30t6 R£G. $239.95
SALE $199,95
B-ime REG. $279,95
SAL£ $24B,95
e-lOa REG. $179,95
SAtE $159.95
B-23S REG. $89.95
SALE $79 95
D-tOtO REG. $319,95
SAL£ $289.95
/
WEWSTAR VS-1500A
ANTENNA TUNER
fieg. $399
SALE! Ca//
SERWNG /lAfXTEURS
. WORLDWIDE
bb Ferrero, W6RJ.
; Jim Rafferty. N6RJ
'' ' ^nd other i*ell
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Sive you
ERSONAUZED ^
SERVICE
ROTOR SALE
Ht ^-
U-110
Call for
price
HD'73
BIRD Model 43
Call for price
fyfost elements
In stock
FREE SHIPMENT
UPS SURFACE (Coniinentaf U.S.) (MOST ITBMSi
TOLL-FREE PHONE
800 854-6046
(Cafif. srid Arizona customers piease phone or visit ftsted stores)
mONE HOURS: 9:30 AM to 5:30 PM PACIFIC TIME.
STORE HOURS: WAM to 5:30 PM MonJhrough Sat
RADIO
OUTLET
ANAHEIM, CA 92801
2620 W. LaFalma,
(714> 761-3033, (213) 860-2040,
Betw&en Disney land & Knotts Berry Farm
BURLINGAMCCA 94010
999 Howard Ave-,
{415) 342-5757,
5 miles south on 101 from S.F, Airport.
*eA * AtUANCE • ALPHA • AMECO • AMP«E<^OL • ANTEftfNA
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OAKLAND, CA 94609
261 1 Telegraph Ave.,
(415)451-5757,
Hwy 24 [>owntown. Left £7th off- ram p.
PHOENIX, AZ 85015
1702 W. Camelback Rd.,
(802)242-3515,
East of Highway 17,
CURTPS*CUSHCRAFT • DAIW*- DRAKE * DX EOGt • EJMAC
HyStLEflr p HV-DAIN • IC-OM » J. W MltLEH ■ KANTRtONJCS
KeNWOOCi » KLM" LARStN * L^NAFi • METZ * MFJ - MCWO-LOG
SAN DIEGO, CA 92123
5375 Kearny ViHa Rd..
(619)560-4900,
Hwy 1&3 & Ctairemdnt Mesa Bbvd.
VAN NUYS, CA 91401
6265 Sepuiveda Blvd.,
(616)986-2212,
San Di^go Fwy at Vtciory Slvd,
MJNI-PROCJUCTS • MJPAGE ■ NYE • PALOMAH p POBOT • ROHN
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Pnces. specifications, descriptions sut>j&ct to change without notice. Caiif. &nd ArUona r&std&nts pfease add sai&s tax.
73 Magazine • AprH, 1984 3
HUSTLER
DELIVERS
RELIABLE ,
ALL BAND HF /
PERFORMANCE
Hustler's new 6'BTV six-
band trap vertical fixed
station antenna offers
ai band operation
with omnatched con-
venience. The 6-BTV
Offers lO, 16. 20, 30,
40, and 75/80 meter
coverage wfth ex-
cellent bandwidth
and bw VSWR. Its
durable heavy
gauge oJuminum
construction witti
Hbergjass trap
forms and stain-
less steel hard-
ware ensures
long fella bllity.
Thirty
mater kits
;30-MTK)
for 4-BTV
ord5-BTV
are also
available.
Don't miss our 30 meter excitement
HUSTlfR -
SnUTME STANDARD OF PERFORMANCE.
NV
m
E»
3276 rsksfth "3" A^nu©
SOssimnnee, Flortda 32741
An
.^12^
$15
DTMF DECODER
$15
Cempa^T
The UM2RK decoder kit corv
verts your receiver into a special
receiver or control. When a user-
selected time-tone combination
is received, the output provides a
relay control for activating
speakers or other devices.
INPUT: Audio from transceiver,
scanner, etc.
OUTPUT: SPST (N.O.) relay.
FEATURES: Single or dual tones
adjustable over the 16 digit
Touch Tone range • Adjustable
response time • Relay output •
Manual or auto reset • Single
tone ON latching with different
single tone reset OFF • Oper-
ates on 12VDC • Interfacing of
multiple boards for multi-digit
sequential activation and reset.
APPLICATIONS: Gall-up system
• Repeater or commercial con-
trols • Etc. limited only to your
imagination •
Actual Size 3'' x 3"
— Shown Assembled
UM2RK decoder kit includes atl
component, relay, and P,C.
Board . • .
$15 plus $1.50 shipping.
LJM2RC enclosure kit includes
molded case, speaker, input
cable. . .$5 plus $1,50 shipping.
For information and to
order write:
See the demonstration in
booth 318 at the Dayton
Hamvention. ^^
THE METHENY CORPORATION
204 Sunrise Drive, Madison, IN 47250
INFO
Manuscripts
Contnbutkms In rh* Fonn of mmm^
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cun Maunw no rs&ponsi&lllly fof IcVH
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Bni<claa« ■ vt^inp^d, a^^tddfMSad
«nvikJDpe Willi eachi 9ubtrit«ttlctn Pay^
manl for %h& usa of »ny unbot'cUttl
rnilwlal will b« rrub* upon tooao
tane* All conlrtbuilon« stKiuld bo di-
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Manuscripts
?3 INpflna nS3N QOa»«lOt tt pu&
IWiad monthly 6v 7a kic^ ■ aytaldtefy
«( Wfynt Gfwn, Incu W Prn* Stnm,
4H 034ae. Second
p«id 14 PamooiOMgn
qEM« and ■! KidltiBiial jaMMig Dfliow.
&i(lr* con|«nts oep^fltf^e t964,
Wifyna Qrvaa Inc. AJI rtgMa rtHnvd
No 0»^ «f ieii» puOticsiJoi> mar &•
taprimad or oUwwIaa nomOuem
wlthoili wnttan pannlaalon fi«m Vm
pufeliahsr. MJciomni &iilo<^— UkiMral-
ty Mkroflfni, Arvi Aitv Ml ^eioe.
J
4 73 MagazinB • Aprfl, 1984
A microthin, synthesized,
programmable, sub-audible
tone encoder that fits inside
the ICOM IC-2AT
Need we say more?
$2995 ^
t5^tt*
r^l
7
.vi
1 >
ic- 1.07. .
[5 0£lf
■I'^iifc..
Olj
r
COMMUMCATIONS
m SPECIAUSTS
^iia
i'
426 West Taft Avenue, Orange, CA 92667
800/854-0547 California; 714/998-3021
W2HSD/I
NEVER SAY DIE
ecWtoria/ hy Wayne Gre&n
THE SONY SURPRISE
A couple of years ago, Sony
brought out their 2001 alt-band
digilally-controlled receiver. It
wasn't terribly sensitive, but it
wouid tune In CW and sideband
and the price was, particularly
for Sony, most reasonabie. This
was followed by their 7600
shortwave receiver— truly a
marvel of compactness, small
and light enough for the Jacket
pocket. It also had amazing
bandspread for the most popu*
tar shortwave broadcasting
bands— and a surprisingly tow
price.
This was followed a year
later by the 760OA model, with a
couple more bands. I liked this
one particularly because it
covered 40m and the CHU time
signals, a nicety skipped In the
first modeL I took this radio
with me on alt of my foreign
trips so I could check the VOA
newscasts and make tapes of
local AM/FM and SW stations
in unusual spots around Asia
and the Middle East,
Then last year Sony did it.
They put the digital tuning sys-
tem from the 2001 into the 7600,
calling it the 7600D, (digital, I
presume). Wowiel Again, as
with the 2001, the sensitivity is
about on a par with Don
Ricktes, but it tunes from 150
kHz to 30 MHz, plus the FM
band! It has a bio and a vernier
on the tuning so you can tune in
sideband just fine. !t also has
ten buttons you can program
for Instant frequency setectlon.
I find that handy for WWV^CHU
time and my favorite FM sta-
tions. Yes, it has an automatic
scanner, too.
It's possible that some of the
ham dealers carry this radio.
You might want to check
around. If you travel much, this
can be a real prize. I love check-
ing the 20m and 15m bands
from different places around
the world as I travel.
I've been looking for a ham to
join my staff who might, in addi-
tion to testing new ham gear in
the W2NSD/1 ham shack for re-
views in 73, arrange with Sony
and other such manufacturers
to make non ham products
such as this available via our
Dayg UFever KMlK
RD 4
Manherm, PA 17545
USA
Ldnc<iit«r
Counfv
QSL OF THE MONTH
To enter your OSU pux It In an ervveiope along with your chotca of a book from 73"^
Radio Bookshop and ma i MHO 73, Pine Street, Peierborough NH 0345fl, Altri: QSL Of the
Month, intries not tn envalopes or withgut a bcok cholca w\\\ not be accepted.
6 73 Magazine • April, 1984
magazines. Every now and then
i find a toy like this which I think
might interest readers but
which could be hard to find for
most people,
I'm one of those people who
rush out and buy almost any-
thing nevy. I almost always have
a few surprising toys in my
Shoulder bag when I travel It
might be a radio, a miniature
TV, a new kind of digitai watch,
or a new briefcase computer.
Some people are just now
discovering the Walkman , . J
had one of those within hours
of its reaching this country
eight years ago.
A lot of these gadgets you
see in the mail-order catalogs
are dogs, despite the glowing
copy and gorgeous pictures. I
pore over each new Sharper Im-
age, Markline, JS&A, and so on
catalog that arrives. Yep. I've
tried the hanging by the feet
gadget-
For instance, take the new
tiny TV sets. Great technical
marvels, no question about it,
but who needs a Walkman TV?
On most of the TV shows these
days, you can turn off the pic*
ture and lose little, so if you're
an addict, why not just get a
miniature radio with the TV
sound channels? I doubt that
we are going to see many peo-
ple walking around the streets
with portable TVs on their
hands,
Ciive Sinciair has invested an
enormous amount of time and
money developing a very small
portable TV. But for whom? I
suspect that it was more the
challenge of making it than any
serious market expectations
which drove Cllve. i'il be watch-
ing the success of the Sony
Watchman and the new Casio
Contmued on page t46
STAFF
ASST. EIHTOn/PUSUSH ER
Jeff D*Tfi^W8aBTM
EXECUTIVE EDITOR
JofinC. Burmtt
MANAdlNd EDrrofl
Suaan Phl1 brick
ASST. HAPtAQlNO EDFTOR
StfiVD JfiWOtI
EDfTORlAi ASSISTAMTS
wancy Noy<J
Richifd PtienlJt
ASSOCIATES
HabartGalwWBSGFE
John Edwvt»> Kmi
BMOomyKOe
Chod H«m« VP2iyiL
Avory L Jvnkini waSJLG
Dr. MftfC LMv«v WA3AiR
Bill P»t0m^ WA&fTF
Notwn SMrinJty AF2M
piiopucnoli EHiiCToa
Nancy Silmon
AOVERTISIHO aRAPHICS
MANAQEfl
ScoliW. PhUbflcK
OESIQM DIRECTOR
Chrlitlnie D«alrernpatt
COVER OESia^
Olvme Rttftdn
PRODUCTK}N
UhrtBond
andyOoucNr
INlvlcia Bndkvy
Mich««l Ford
M«r|Ori4Q4lll#«
Donivi Hftrtwfltl
Pawl ft FLamMy
AnntRocchfo
Lynn* SlmonttOTn
J&an Southwort^i
Konnath SutcNrfe
Theresa Varvhl9
Rob^n M. VllJ4ri«ii^
PM0TOQRAPH¥
Nalhanlel Haynas
Lfturt* Gaf iJaa
Sturdy TncMnas
TYPESETTIiia
Sara Bwlail
Piwrr Knannia Gonoajfu
Lynn Haiiw
QnitMA iAIOyfTAliu
Kliiibviy NwMwi
Undy Palmiuno
Ntidt H. Tttomm
VICE PRESIDENTKIENERAL MANAGER
De^« Wtthorbfw
VICE PRESIDENT^Om'RDLLER
Rogar J. Murphy
ASSISTANT
TO THE PRiSiPSNT
Mattt^mv SmUh KA1IEI
ACCOUmiNa UAMAOER
Knu4l Kj^iiAT KV4Gan
ClflCULAT1044 MANAOEII
Wllltaffl P. Howferd
RETAIL AND HEWSSTAMO
SALES MAM AQER
flJflfWfr flotnniou
ADVUTnSfNQ
Jim Gray WD^U.M^T-
Nancy Champa, A»«t< Mpr
Rosa KvnyQfi KAIGAV
-J»T^
i'P k e NWOpO 2m m Ttt AN 5CE rwR
TR-2500
We
:e, smaller p
^e TH-25O0 is a compact 2
meter FM handheld tranficeivcr
with every conceivable operating
feature.
TR-2500 FEATURES:
• Weighs 540 g, (L2 Ibsl, 66 (2-5/8)
W X 168 (6-S 8J H X 40 (I-5/8J D,
mm i inches),
• LCD digital frequency readout.
• Ten me mo lies includes "MO' for
non-standard splJl repealers.
• Lithium battery memory
back-up, built-in. {esL 5 year lifeK
• Meiiior\' scan*
• Programmable auromaUc band
scan* and upper/ lower scan
limits; 5-kHz steps or larger.
• Rtfpcater reverse operation.
• 2.5 W or 300 mW RF output.
fHI/LOW power switch) .
• Built-in tunable (with variable
resistor) sub-tone encoder.
• Built-in 16-key autopatch cnrodcr
• Slide-lock bauer>' pack,
• Keyboard frequency selection.
• Covers 143.900 to 148.995 MHz.
ratfdl
wn- iargTng
• B ttus indit^ior,
• Complete with flexible antenna.
400 mAH Ni Cd batler> , and
AC charger.
Optional accessories;
• ST'2 Base station power supply^
charger (approx. 1 hrJ
• MS I 13.8 VDC mobile stand'
charger/power supply.
• VB-2530 2 M 25 W RF power
amps., ITR-2500 onlyl.
■ TU'l Programmable CTCSS
encoder (TR-2500 onlv).
• TU 35B Programmable CTCSS
encoder Imounis Inside
TR'3500 only)*
• PB 25H Heav\-dutv 490 mAH
Ni-Cd batter)' pack.
• DC 25 13.8 VDC adapter.
• BT-1 Battery case for AA
manganese/alkaline ceils.
• SMC'25 Speaker microphone.
• LH-2 Deluxe leather case.
TR-3500
70 CM FM Handheld
• Covers 440-449 995 MHz In
5-kHz steps,
• HM.5 W. Low 300 mW.
• TX OFFSET switch, ±5 kHz to
±9-995 MHz programmable.
• AuiD 'manual squelch control,
■ Tone switch for opt. TU-35B
• Other outstanding features
similar to TR-25do
• BH-2A Belt hook.
• RA-3 2 m 3/8 i^ telescoping
antenna (for TR-2500),
• WS-1 Wrisi strap.
• EP-1 Earphone.
TR-7950/7930
Big LCD, Big 45 W, Big
21 memories, Compact.
Outstanding features providing
maximum case of operation
include a large, easy-to-read
LCD display, 21 multi-function
memories, a choice of 45 watts
(TR-7950J or 25 watts lTR-7930),
and the use of microprocessor
technology throughout.
TR-7950/TR 7930 FEATURES:
■ New. large, easy-to-read LCD
digital display. Easy to read In
direct Siunl^ht or dark f back-
lighted). Displays TXyRX fre-
quencies. memoiy channel,
repeater oUsel, subclone number
scan, and memory s<^n lockouL
• 21 new moliJ-funetlon memory
channels. Stores frequency.
repeater oftset. and optional
sub-tone channels. Memory
pairs for non-standard splits.
"A*" and *B" set band scan limits,
Lighted mt.^mory selector knob.
Audtble "beep" indicates chatinel
I position.
Lithium Liatterv memon^ back-up.
(Est. 5 yr. life.)
45 watts or 25 watts output.
HI/ LOW power switch for reduc-
tion to 5 watts.
Aulomatic oOset. Pre-programmed
for simplex or ±600 kHz offset,
in accordance with the 2 meter
band plan. *OS" key for majiual
change in offset.
• Programmable priority alert.
May be programmed in any
memoty.
• Programmable memory scan
lock-out. Skips selected memory^
channeb during scan.
• Programmable band scan wldtii.
• Center stop circull for band
scan* witJi Indicator.
• Scan resume selectable. Select-
able finfonrnlic time resume-
scan, uj turrlcr operated
resume -scan.
• Scan sUuiystop from up/down
microphone.
• Programmable three sub- tone
channels with optional
TU-79 unit (encoder].
• Built-in 16-key autopatch encoder,'
with mom tor (Audible tones).
» Fronl panel keyboard control.
• Covers 142.000-148.995 MHz In
5-kl42 steps,
■ Repeater reverse switch.
(Locking}
• "Beeper* amplified tlirough
speaker.
• Compact lightweight design .
Optional accessories:
• TU~79 three frequency tone unit.
• KPS-I2 fixed -station power
supply forTR-7950.
• KPS-7A (ixed-staUon power
supply for TR'7930.
• SP-40 compact mobile speaker.
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Doing It at Dayton
This unofficial Hamvention handbook
helps attendees and dreamers alike.
Change may be a hall-
mark of a democratic
society, but it is also the by-
word of the 1984 Dayton
Hamvention, whose leaders
have made major modifica-
tions to the annual April
event
The location is the same,
Dayton's Hara Arena, and
the dates for the 1984 event
are in their traditional loca-
tion: the last full weekend of
April (27, 28, and 29, for
1984), but there have been
considerable changes made
in other areas, primarily the
ftea market. According to
the cochairman of the Ham-
vention, Harold ''Hal" Judd
WA8KNM, the changes
should be "99 percent to ev-
erYone's benefit"
Topping the list of
changes for 1984 are the set-
up times for the flea-market
vendors who have waited
long hours in line in the past
to get a space, This year,
those holding flea-market
permits, which can be se-
cured only by ordering in ad-
vance, will be allowed to set
up as early as Wednesday or
Thursday in an assigned,
numbered space. The spaces
will be assigned on a first-
come, first-served basis,
meaning those who request
a flea-market space and in-
clude the appropriate mon-
ey with the request ($15,00
per space, four-space maxi-
mum) wi[l be assigned a
space first Hamvention
Flea-Market Chairman, John
Crody WB8TEK, hopes this
will eliminate the imposing
practice of vendors waiting
in line, sometimes as long as
three and four days, to get
what some consider prime
flea-market real estate on
the Hara Arena parking lot,
The official times for set-
ting up in the flea market
{for those with advanced
sale permits only] will be
Wednesday, April 25, noon
until 5:30 pm local time, and
Thursday, 8:00 am through
the time the flea market
opens to the public at noon
on Friday. No sales will be
permitted in the flea market
prior to noon Friday when
the gates will be opened of-
ficially to an anticipated
crowd of over 20,000. Flea-
market vendors also are
reminded that a general-ad-
mission ticket is required for
admission to the f iea market
in addition to your f Sea-
mark et permit, so be sure to
order it when you request
your flea-market permit
Since flea-market spaces
are available only by ad-
vanced sales, the wisdom of
ordering early is obvious.
Ordering your general-ad-
mission ticket early would
also be wise since the price
has been increased to $7.50
in advance and $10.00 at the
door. No doubt about it this
year— the early bird gets the
worm, the best flea-market
space, and gets to save $2.50
on his ticket
For those who were there
last year, you'll notice that
the opening time for the flea
market has been shifted
Hams show up in droves when April comes to Dayton. Here's
just part of the typical crowd that overflows the Hara Arena
each year.
10 73 Magazine • April, 1984
You1l find anything and everything electronic at the Dayton
Hamvention, even a ham who has brought his own street
light
The Silver Arena section of the Hara Arena is just one of three M between f!ea-market expeditions, vistors to the Hamven-
far^ areas devoted to dealers and manufacturers' representa- lion might make a side trip to Wright-Patterson field, home
lives. of the US Air Force Museum,
from Saturday morning (as
in 1983) to noon on Friday
[as it was in 1982). This
means that sellers will have
two and one-half days to dis-
play their wares, and it also
improves their odds of get-
ting dry weather, a must ele-
ment for outdoor display of
radios and other moisture-
sensitive electronic equip-
ment
To order flea-market spac-
es, send $15.00 per space
(maximum of four per cus-
tomer) to the Dayton Ham-
vention, PO Box 2205, Day-
ton OH 45401. Grody said
that no flea-market spaces
will be assigned until after
January, but that requests
which have come in will be
given spaces in order of their
arrival.
For anyone needing more
information, Grody and his
committee have made yet
another change by setting
up a flea-market informa-
tion hotline at (513)-223-
0923; this will be answered
between the hours of 8:00
am and 10:00 pm EST begin-
ning well in advance of the
Hamvention.
More Changes
The changes in Hamven-
tion '84 don't stop with the
flea market. The Hara Arena
has been expanded since
Hamvention '83 and now
has an additional 10,000
square feet located near the
Silver Arena. The new space
will be used in 1984 for the
many Hamvention forums,
while the space previously
occupied by the forums has
been made available to in-
door sellers. Cochairman
]udd believes that between
200 and 225 exhibitors will
be displaying their wares in-
side the arena this year, and
that includes the dealers
and the manufacturers' rep-
resentatives from such well-
known companies as Trio-
Kenwood, Icom, Yaesu, Hy-
Gain, Drake, and Cushcraft
With the expanded num-
ber of indoor exhibitors and
the expected 1 ,500 flea-mar-
ket vendors, there's going to
be a lot for the Hamvention
attendee to peruse in a
short, two-and-one-half-day
tour. But never fear, there is
a way to do it, and the key is
planning. Plan to get an ear-
ly start each day, and plan
each day as carefully as
possible
As soon as you enter the
indoor part of the Hamven-
tion the first time, you will
be given a plastic bag which
will contain the Hamvention
CHECKLIST FOR YOUR DAYTON TRIP
• Secure room resen^ations early, for the nights of April 27
and 28, and if you intend to arrive early on Thursday » for April
• Purchase Hamvention tickets In advance and, If applicable,
flea-market-space permits.
• Have the members of your group oommitted to attend the
Hamvention and determine yoor transportation require-
ments.
• Save enough money to cover the cost of the trip and to cov-
er the cost of any planned purchases, Tum most of your cash
into traveler's checks as these are readily accepted at the
Hamvention and at the flea market. Personal checks are NOT
a readily-accepted method of payment. If a dealer has a
choice of a cash sale or taking a risk by accepting a personal
check, hell probably take the cash.
• Pack clothing necessary for your three- or fournlay trip.
Don't forget, the weather is very changeable.
• Arrange for time off from work if you're part of the latwDrlng
class,
• Make and carry a iist of things you Intend to purchase at the
Hamvention, The abundance of equipment found at the Day-
ton flea market is mind-boggling and could make you forget
what you came there to buy.
program. This is your key to
the entire event and it is
worthy of a few minutes of
study Flip through the pro-
gram, find the pages alio
cated to overall and interior
maps of the exhibit area,
and orient yourself, Next,
check the times of the fo-
rums and note the ones you
might be interested in at-
tending. Try to work your
tour around these times be-
cause the forums come only
once while the flea market
and indoor exhibitors will be
there for the duration. This is
one way to guarantee that
you won't miss anything and
be forced to go home with
some heavy regrets.
You might atso try to plan
to have some energy left af-
ter a full day of hamfestrng
on Saturday to attend that
evening's banquet This yearns
banquet speaker will be
Harry Dannals W2HD, past
president of the Amateur
Radio Relay League.
Cochaimian Judd added
that there have been some
changes made to the ban-
quet not in the ticket
prices— which remain $14.00
in advance and $16.00 at the
door— but in the menu.
Judd said that the main
course this year will be filet
mignon. If youVe ever in-
tended to attend the ban-
quet, this might just be the
year to do it.
73M9^zine • Aprrl, 1084 11
Necessities
Hamvention veterans are
well aware of what to bring
to the event and how to
dress, but for the sake of the
newcomer, let me review
some of the time-tested
practices. If you plan to
drive to Dayton in a private
car from 500 miles away, as
our group does, set aside at
least $100 for gasoline,
weekend accommodations,
and food. Motel reserva-
tions should be made as ear-
ly as possible and the Ham-
vention Housing Bureau can
be a big help. You would be
wise to take advantage of
the service this Bureau of-
fers. In the past, food has
been plentiful and tasty at
the Hamvention and, I
might add, reasonably
priced The same is true for
most of the restaurants in
and around Dayton, so if
you have the money set
aside for eating, you will not
starve. Just make sure you
budget property.
Let me suggest that you
dress for the Dayton weath-
er—and that means bring
one of everything, I've seen
years where the weather has
been exceptionally beauti-
ful—70 degrees plus during
the days and no cooler than
40 degrees at night— while
I've also seen the worst-
constant rain and near-
freezing temperatures dur-
ing the days and nights. So
dress according to the old
outdoorsman's adage, in
layers so that you can take
off or put on as the weather
changes. And make the final
layer a waterproof garment
while keeping the heavy
coat within reach should the
temps fall to an extreme. It
can happen. The weather
can be great or lousy and it
can be a determining factor
in how good a time you have
^ the Hamvention, so go
prepared. The weather was
great in 1982 with the only
problem being chapped lips,
while last year's weather
was fit only for the ducks
and the well-prepared.
To keep up with the mem-
12 73 Magaiine • April, 1984
GENERAL INFORMATtON
Send, ticket orders to:
Dayton Hamvention
PO Box 2205
Dayton OH 45401
Flea-Market Hotline
{5ia>-223^23
(Try to limit calls to between 8 am and 10 pm EST*)
Inside ExhfbTts Informatkai
(5l3h23&€160
Prices: Registration general admission ticket is $7.50 in ad-
vance and $10.00 at the door. Tickets on sale in advance by
mail Of at the arena during tlie regular Hamvention hoursj not
awaiiabte over night as in the past,
Hamvention General Chainnan
Jack Mftchell AA8Q
Asst. General Chainnan
Harold "Hal" Judd WA8KNM
Fifta-Market Chairman
John Grody WB8TEK
Advance Registration
Marge Mitcheli WD6DSN
Apri 28 Banquet Speaker Harry Dannals, Past President, the
Amateur Radio Relay League. Banquet tickels— $14.00 in ad-
vance. $16.00 at the door.
Flea-Market Setup Times
Wednesday, April 25: Noon to 5:30 pm. Thursday, Apr^l 26;
From 8 am, all night, through to Friday at noon when the flea
market opens to general public. Ati ffea-market permits wltt
be sofd in advance this year. None said during the Hamven-
tion. Fiea-market vendors must have registration tickets and
flea-market permits to be admitted to the flea market during
setup times.
Flea^Market Selfing Times
Friday: noon to 6 pm.
Saturday: 6 am to 5 pm.
Sunday: 6 am to prize drawing.
bers of your group, 1 would
suggest that you rely on the
ever-popular two-meter han-
die-talkie, but try to have ev-
eryone bring a synthesized
rig so that you can be flexi-
ble in finding a standby fre-
quency. A crowd of over
20,000 hams can generate a
lot of rf.
Finances
Don't say it; I know what
you're thinking. Here I've
told yoy about all of the
great changes for the grand-
daddy of all hamfests, but I
haven't said how you can af-
ford to go.
First things first Talk to
your buddies on the local re-
peater about a possible trip
and find out who would like
to go, and then get a con-
crate commitment from
them so that you can plan
properly. Then have each
person arrange to have the
days off from work that
theyll need to make the
trip. Setting aside Thursday
for travel and Friday morn-
ing for setting up in the flea
market may work, but if
you're traveling far and plan
to be in Dayton for the prize
drawing Sunday afternoon,
you might also consider tak-
ing the following Monday
off from work to con-
valesce. YouH enjoy the trip
more if you know that you
don't have to go right back
to work as soon as you get
home.
Enough planning. Let's
get down to paying for the
trip. Overtime and part-time
jobs are possible sources of
extra revenue, but since if s
a hanrvradio activity, it
seems appropriate to me
that ham radio should help
meet the expenses, Thafs
where all of this talk about
the flea market comes in. At
a cost of $15.00 a space,
three people can split the
expense (investment?) and
sell a lot of their unused
equipment Agreed, ifs a
common ploy at a hamfest,
but I'm talking about Day-
ton, and that means you'll
have probably 20,000 to
25,000 radio enthusiasts
checking out your high-qual-
ity castoffs. As my Daddy
used to say, "With that
many fish, you're bound to
get a bite." And with the
three or four of you taking
shifts at watching over the
gear, you'll get a chance to
check out everybody else's
offerings and still not miss a
sale.
Buying Gear
I always tell myself that if
I sell one particular piece of
equipment, then HI use the
money made on the deal to
buy that new rig I've had my
eye on. Besides being a
great place to sell used
equipment, Dayton is also
the perfect place to buy that
new rig since the dealers are
always in a mood to sell at a
good price. Call it their an-
nual low-price fling or what-
ever you want but I have al-
ways found what I was look-
ing for at Dayton and found
it at the best price. Ask any-
one who's been there and I
bet they'll tell you the same
thing. You'll get to see what
you want to see, put your
hands on it push the but-
tons and turn the knobs, and
then buy for the best price
imaginable.
1 know the dealers wi
probably skin me alive for
saying this, but let me pass
along a word of ad-
vice—spot the piece of gear
you want at three or four
dealers, list the prices, and
then go back to each one
and ask them to give you
their rock-bottom, last-day-
of-the-hamfest price. If you
think one of them is offering
you the best deal youH see,
make your purchase from
that dealer. If yoiJ think you
can get it cheaper wait until
the second or maybe the
last day of the ham f est and
go back to the dealers again
to get their prices. Be aware
that if you decide to wait, all
of the dealers could sell out
of that rig you've been want-
ing so badly. With the prices
being so right and so many
people looking for a deal,
the bargains do not last
long. Once again, be pre-
pared.
And keep one other fact
in mind when you tackle the
dealers— the more the deal-
ers sell, the less they have to
pack up and take home,
Thats why most of the best
deals on the remaining
equipment are made on the
last day of the Hamvention,
on Sunday afternoon when
most folks are hanging
around for the prize drawing
or in the process of packing
up to head home.
If you have trouble work-
ing the deal you want, get
the dealer to toss in an ac-
cessory for little or nothing
more. After all, ft would
make still less that he has to
pack up and take back with
him and it makes the deal
even sweeter for you.
What Will I See?
When you arrive at the
Hara Arena, don't worry if
you think your eyes are
starting to bug out. You'll
probably be seeing a few
things you've never seen be-
fore. Just in the past few
years IVe seen the first syn-
thesized handie-talkie and
the first digital-readout low-
band rig make their irtitiat
appearances at the Dayton
Hamvention. And there's a
reason for it Manufacturers
like to take the wraps off
their new items at the Ham-
vention because they know
that if s their best chance to
show it to a large share of
the amateur-radio commu-
nity at one time. The more
people that see an item, the
better the chances of selling
it Remember the 20.000
plus folks I said could be
walking past your flea-mar-
ket space? Most of the same
people will get indoors also.
The manufacturers also
know that most of the hams
who attend the Hamvention
have a buying urge, and
they'd like you to satisfy
that urge by buying their
product
What else can you expect
to see at Dayton? 1 would
expect to see more comput-
ers interfaced with hanrv-ra*
dio equipment at the '84
Hamvention, and I would
expect to see more dealers
selling software for amateur
applications. Last year, the
RTTY-CW interfaces were
on display and drew consid-
erable crowds, so this year
look for the dealers to take
the next logical step and
explore the computer field
a few steps further. We've
got satellite-tracking pro-
grams that run on VIC-20s
and other basic machines,
so don't be surprised if soft-
ware abounds to turn all
of your ham-radio drudgery
into f untime with your com-
puter. After all, it will be
the coming thing for many
a year to come.
Here We Go!
Okay, if you've followed
me so far, you should have a
pretty good idea as to how
to prepare for the 1984 ver-
sion of the Dayton Hamven-
tion, the hamfest that is
quickly earning the tag,
"center of the ham-radio
universe/' So get your days
off arranged, pack your
clothes and the equipment
you plan to sell, list the
items you want to purchase,
get your group together, and
lefs head to Dayton for
April 27, 28, and 29.
The bunch of terrific guys
I go with started talking
about the 1984 trip on their
way home from the 1983
event so I think we'll be pre-
pared to have another great
time in Dayton, Ohio, Grab
your NT and come join us.
It's gonna be great! ■
428 Central Ave, Johnstown, PA 15905
AN AUTHORIZED KANTRONICS DEALER
The Interface by Kantronics
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tuned circuit through glass with no
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No groynd plane: Full halfwave design—
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instaliatians.
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Four models fpr 2 meter, 220 M Hz and
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a membef of Tlie Affen Group fne,
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Canada: A, Q, Simmon ds d^ Sons, Ltd.
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*^S0« Ust of Advertisers Qfi fiage rJO
73 Magazine * April, 1984 13
Me and My Stupid Old
PMOS Converter
At last, there's an easy way to get -12 V from a +5-V supply.
Who said 'trial and error'?
C R. Bryan Hi WBlHKU/6
7311 Variel Avenue 4
Caaoga Fmk CA 91303
Stupid old PMOS. It's
slow, it runs hot, it gives
protective input diodes a
workout because its output
low can go below ground,
and it needs weird supply
voltages* Most of the newer
NMOS devices have been
designed to make do with
one 5-volt supply, either by
some design rethinking or
by inclusion of a substrate
charge pump on the chip
itself, but stupid old PMOS
IN ^14 A Or
lM4l4e PI
1 LOOPIV
ALL 4
+
t
«T,ir
jr —
Fig, 7. Initial version. With 9 to 79 voi fs input ^nd the right toroid, this circuit might provide
50 V output. LI is 10 bifilar turns §28, L3 is 25 to 50 bifilar turns §28 (I used 25 turns), and L2 is
8 to 10 turns #26. The toroid is a 375-inch ferrite iron} a Radio Shack ^'Ferrites'^ package.
Capacitor Ct resonates with 12 to determine oscillating frequency; 200 pF is probably a good
minimum value to keep interwinding capacitance from getting into the act. The transistors
came from my junk box; the numbers listed are their rough functional equivalents. With dif-
f&Bnt devices, the regulator circuit could waste a lot less current
14 73 MagazirtB * April, 1984
has to have strange supply
levels provided in order to
operate.
It was that last gripe that
had me stymied for a while
I have an old keyboard from
some junked phototypeset-
ter somewhere, bought for
all of ten bucks. It's TTL
throughout, with maybe Vi
A drain on the 5-V, 3-A sup-
ply in my home-brew Cos-
mac Elf, {One miserable
PMOS shift register does
have to have a —12 supply
if I want anything but smoke
from it) At that, the key-
board outputs some weird
code that makes sense only
to the machine for which it
was designed. A local outlet
sells a keyboard encoder,
the AY-5-2376. If 1 kludge
wired that onto the key-
board in place of the orig-
inal logic, I'd have good old
parallel ASCII coming out of
a single 40pin chip, made
of=.-PMOS. Yep— it needs
a —12 supply, drawing may-
be 4 mA, I should build an
additional line-powered
power supply for that?
I've seen a few upconvert-
er circuits around; most use
555s and voltage-doubler
chains. Motorola even has
one with a 7406. Somehow,
all these capacitor-pulse
designs struck me as being
wasteful, inadequate, or
both.
I'm a bit of a QRPp nut
and 1 have the toroids to
prove it— some from Radio-
kit and Amidoa some from
those blister cards Radio
Shack started selling a ye^r
or so ago. I got out my dip-
per and my boxes of small-
signal transistors, turned on
the 'scope and the Weller,
and waded in.
The first circuit I built
does fine with at least 9
volts for a supply. The rec-
tified secondary voltage
soared up to 90 volts at one
point in my experiment-
ing—no load. Thafs why I
put in the 10k load resistor,
to keep the voltage within
the survival zone of the di-
odes, to say nothing of any
regulator I might care to put
in*
As for the regulator cir-
cuitry, I musi admit that I
was playing, I had already
decided to put a 79L12 in
the finished unit but I didn't
have one on hand as yet, so I
kludged this one up in order
to see how much fun I could
have putting together a reg-
ulator, ff you look closely,
you will see not only that
I've abused the reference di-
ode (which prefers to con-
duct only about 73 mAl but
also that the converter is
cranking out upwards of 25
mA, still with enough input
headroom to the pass tran-
sistor for it to regulate. The
mediunvcurrent pair of tran-
sistors in the oscillator got
warm, but not hot, and no-
body seemed to be hurting.
Then I dropped the supply
rail to 5 volts, and the output
got very mushy, . .maybe 8
volts across the output load
resistor.
The problem is in the Dar-
lingtons. I put in the second
pair of transistors, Darling-
ton-styfe, because the medi-
um-current transistors weren't
being driven fully under
load, thus, there was not
-I2V
+3V0C
SUPPLt
ouTHn
Fig. 2. 5-volt-input version. Note that LZ's phase is reversed. EQuivalent transistor types again.
The 79L12 only burns about 4 mA.
enough gain at the frequern
cy in use. The added pair
corrected that but brought
in a new problem: The satu-
ration voltage (Vc£_5^J ^^^ ^
Darlington pair, measured
from the ganged collectors
to the lower emitter, is one
VcE^at p'lis one Vbe for a
typical circuit because the
driver-half emitter is held
high by the final-half base-
emitter diode (one Vbe), ^nd
their collectors are tied
together. The collector of
the driver-half can't do more
than saturate — it can't go
lower than its emitter. More
current into either the driv-
er's base or the two collec-
tors only drives both volt-
ages higher, making the
problem worse. I was losing
virtually 2 Vbe on each side
of the main winding, even
with the protective series
diodes shorted out Thafs
fine for circuits with, say, 9
volts or more ratl-to-rail, but
down at a 5-volt supply
level, the missing voltage
swing was proportionately
too large to be ignored.
At this point I remenv
bered the comfxjsite PNP in
the final stage of National's
LM380, and the final version
started emerging on paper.
I have even more voltage
gain here, because the
driver stage is ainning com-
mon-em itter rather than the
common-collector driver in
the Darlington version. More
important the final stage is
free to pull its end of the
transformer's main winding
as low as possible, roughly
0.2 volts with these par-
ticular parts. That means
that the total possible swing
for the transformer, ignoring
coil losses, is 9.6 volts —
much better. Of course, I've
ignored here the effect of
available voltage swing on
circuit impedance, which af-
fects the available juice
(wattage) from what is, in ef-
fect a self-excited balanced
transmitter. I chose a more
rudimentary approach, one
within my immediate com-
prehension. In other words,
Tm lazy, so I just called it an
astable multivibrator and I
played around with it until it
worked.
It works. The keyboard
converter starts up every
time and feeds a dead quiet
—12 volts to the shift reg-
ister If II do the same for the
2376 instead, when I get
around to the surgery in-
volved. Then there's that
Motorola character genera-
tor few translating ASCII into
a video bit stream; that
needs two weird voltages —
and ifs NMOS! That just
means there'll be two sec*
ondaries on the toroid. I've
even got a couple of PMOS
character generators that
need ±14 volts.
There are several points
of design and technique to
be mentioned here. First
most bipolar transistors be-
have very nicely like zener
diodes when their bases are
driven 5 to TO volts more
negative than their emitters
(positive for PNPs). Unfor-
tunately, the localized heat
in the base region of the
transistor chip causes per*
manent changes in the dop-
ing arrangement so the beta
goes down. This is why most
multivibrator designs have
diodes with high PIVs in
them, to keep the sharp neg-
ative spike through the ca-
pacitor from doing damage.
If you are running such a cir-
cuit with a supply higher
than 5 volts, you must have
them too Otherwise, if the
'scope shows that the col-
lector voltage has a needle-
thin negative spike going
lower than ground on the
falling edge of its wave-
form, your transistors are
being degraded even as you
watch.
The second point is one of
balance. Some of Doug De-
Maw's QRP amplifier de-
signs are crawling with
toroids, just to swamp out
tolerances and force a 50%
duty cycle in the output sig-
nal I got by with just one tor-
oki by using the twisted-pair
wiring shown, but a litde ar-
tistic symmetry in windings
placement is required too.
Caveat constnjctor.
The third point is the
toroid itself. 1 used some
from those Radio Shack
packages, and they work
very^ well. The ones you will
pull out of there might
not- ifs a matter of size
73 Magazine • April, 1984 15
and ferrite mix. The highest-
permeability device is the
one to use, because you get
more inductance per turn of
wire (mine were around 350
uH with ten tums). Such
toroids are designed for a
lower frequency range, so
you can run them at a lower
frequency, where the diodes
rectify better (I've run the
prototype up to 2 MHz, but
its overall efficiency is best
at around 50 kHzL and
where it's a lot easier to con-
tain the rf that any power
oscillator spews out The
2-MHz version wreaked
havoc with an AM radio
across the room; the 50-kHz
CI
C2, 4, 6
G3
C5
D1-6
D7
L1,2.3
Ql,2
Q3,4
Q5
Parts List (for Fig, 1)
200-pF silver mica
CK05, 104k, ,1*uF monolithic ceramic (Better than a
disc capacitor for high-frequency decoupling be-
cause the internal sandwich construction results In
a low-inductance paci^age. Substituting for one usu-
ally invotves a .Ot'^uF disc ceramic paralleled with a
.001 disc or a 100-pF silver mica. Here, a .01 -uF disc
will do.)
47-uF, 16-V aluminum electrolytic
4J-uF, 50-V aluminum electrolytic (Up to around 25
uF is useful at this current level; more than Ihat can
cause start-up problems for the osctltator, due to
loading.)
1N4148 or 1N914B switching diodes
1N825A temperature^jompensated reference diode
(It consists of a reverse junction in the same package
with a forward junction; at 7.5 mA of current through
the diode, the compiementary temperature coeffi-
cients of the two lunctions cancel each other out.
With the voltages shown, the consent through the
diode in Fig, 1 is nearly double the correct value,
which doesn't hurt it but wastes t}oth the current and
its compensatioa Newark Electronics" Catalog 105
lists Ft for $1.90.)
See text
NPN medium-current switching transistors (The fast-
er the better. I used 2 N 3568 equivalents; 2N2219A is
easier to find.)
I^IPN switching transistors (The faster the better,
2N3904 is widely available.)
NPN medium-current transistor (Speed isn't critical,
but gain and wattage are. 1 used a 2N699, which is
barely adequate. It should be at least a heat-sunk
2N2219A, maybe a T1P48. Better to be overcautious
on wattage than to worry about its surviving a short
or a stjlhair heat buildup.)
06. 7,
8
NPN small-signal transistors (I used 2N3904
equivalents. With higher beta, resistor values in the
regulator may be raised, conserving consent. Beyond
the voltages shown, start paying attention to the cot*
Idctor-voltage ratings of these devices.)
R1, 2. 3 10k,V4-W (With the regulator in place, R3 isn't really
necessary, but it's a cheap security blanket)
R4, 5 ^k,V*^N (As mentioned, R5 should be a 1.8k.)
R6 680-Ohm,V*-W
R7 4.7k
R8 5.1k (The regulator (05-7) regulates by keeping the
R7-RS voltage divider's tap at the same voltage as
the reference (6.3 V in Fig. 1). Their ratio sets the out-
put voltage.)
R9 10-Ohm (This resistor sets the current-limiting level.
When the voltage across it reaches the .6-V turn-on
threshold of Q8, 08 will begin stealing base current
from 05, turning it of I. With this value for R9, that's at
60 mA output.)
version doesn't bother it a
bit, even though the lower
frequency is more likely to
provide harmonics within
easy reach of BCB carriers
My guess is that the diodes,
which do take a finite
amount of time to go into
and out of conduction, sim-
ply digest the lower frequen-
cy more thoroughly, reflect*
ing a lot less trash back into
the oscillator,
The less rf noise, the less
shielding is required and the
less hassle you have arrang-
ing for air flow to carry heat
out of that shielding.
My converter simply sits
parked in one comer of
that keyboard, unshielded,
kludgewlred Into holes drilled
in an etched-clean section,
making less noise than the
keyboard scanning clock.
Obviously, anywhere one
or two greedy little circuits
demand a strange supply
C3
C5
Parts List (for Fig. 2)
CI Select in test (200-pF starting value» may end up at
.01 uF or higher. In order of preference: NPO ceramic,
polystyrene, silver mica, mylarTM, disc ceramic. The
tiighef the frequency, the more the capacitor's quali*
ly matters* 220-pF silver mica: Jameco DI^15-221J,
C2, 4, 6 .1-uF monolithic ceramtc or ,01 -uF disc ceramic (.01
uF: Jameco Da01/50, 8c.)
47-uF, 10-V electrolytic (47-uF, IfrV: Jameco A47/16,
24«,)
4 J-yP or more electrolytic (Working voltage should
be at least IVi times unregulated output voltage.
4.7 uF, 50 V: Jameco A4.7/50, 19«.)
C7 l,Q-uF tantalum or lO-uF aluminum electrolytic,
(Working voltage should be significantly higher than
regulated output voltage. 1.0-uF, SS-V tantalum:
Jameco TM 1/35, 29c J
D1-4 1N4148, 1N914B, or other silicon signal diodes
{Should be rated for minlmums of 50 PIV, 50 mA con-
tinuous forward current, maximum switching time 10
ns or so. 1N400l'type rectifiers can*t switch fast
enough, 1N4148: Jameco, 15/$t00. Fairchild rates
these devices at 100 PIV, 200 mA, 4.0 ns.)
LI, 2, 3 Windings are determined by application and circuit
values. See text and schematic for prototype values.
Bitilar windings are prepared by twisting twin
lengths of pretenslNzed wire with electric drill to 10
-20-turns-per-inch pitch. Torold is from Radio Shack
pacltage of ferrates. A good equivalent is Micro-
metals FT50^: Radiokit, 60q;.
Q1,2 NPN medium-current switching transistors—
2N2219A, MPSU06, 2N3568 (Dissipation limit should
be at least Vz \N, 2N2219A: Jameco, 2/Sr)
03,4 PNP switching transistors— 2N2907, 2N3906 (The
faster I he tetter. 2N3906: Jameco, 4/$1; Priority-One
#062N3906. 5/$1.}
R1.2 47k, %.W (PriorilyOne #05RGQ473U 50/S1; Radio
Shack #271-1342, 5/39e.)
R3 10k, V-iW (Priority-One #05RCQ103U 50/$1; Radio
Shack #271-1335, 5/39$.)
U1 Motorola 79L12 in prototype (Device choice depends
on application. PC layout will accept 78XX, 79XX,
LM340. and LM320 devices with Inline pins (L, P, M, T
types). Check pinout before installing. Positive regu-
lator may be used to regulate negative voltage by
making regulator output common. 79Lt2: Priority-
One #05MC79L12CP, $1,00.)
Converter will be most efficient in a frequency band whose
low end is determined by transformer reactance and whose
high end is determined by transistor and diode speeds and
capacitor quality.
16 73 Magazine • April, 1934
ICOM HF
Which ICOM HF Should I Buy;
?
IC-751
General Coverage Receiver
9 Band Ham Transceiver
•General Coverage
Receiver
•160- 10 Meter Horn
•QSK
•FM Standard
• 32 Tunable Memories
With Lithium Battery
Backup
•12 Volt Operation
• High-grade FL""A
455KHZXTAL Filter
• M to VFO, VFO to M
• Large Knobs/Spacing
• Fluorescent Display
• RIT/XIT Readout
• 105dB Dynamic Range
• Mode Memory
• Squelch
• Possband Tuning
• Intemaf Power Supply
Option
• Program Scan
• Memory Scan
• Mode Scon
• Dual VFO
•Multiple Filter
Options
• 100% Duty Cycle
• Buflt-ln Preamp (Top
Panel Switch)
:^niHi
**^ i 1^
.^ ^
■> ,'•
3 u
IC-745
General Coverage Receiver
9 Band Ham Transceiver
• General Coverage
Receiver
• 1 60 — 1 0 Meter Ham
• 16 Tunable Merrwries
With Lithium Battery
Backup
• IF Shift
•Passband Tuning
♦Program Scan
• Memory Scan
• lOOdB Dynamic Range
Internal Power Supply
Option
Dual VFO
Multiple Filter
Options
Mode Memory
Squelch
CW Keyer Option
100% Duty Cycle
Built-in Preamp
IC-730
8 Band Ham Transceiver
Compact, Mobile
•80—10 Meter Ham
• 8 Tunable Memories
• Dual VK>
• IF Shift
• Passband Tuning
Option
•CW Filter Option
• lOOdB Dynamic Range
• 12 VDC Operation
• Large RIT Knob
• Mobile Size: Only
3.7"(H)x9.5"(W)x10.8"CD)
• Built-in Preomp
Optional Accessories! PS15 Power Supply. PS30 System Power Supply, PS35 Internal Power Supply (751, 745). Mobile
Mounting Brackets (730.745). tC'2KLLinear Amplifier (includes separate IC-2KLPS Power Supply), ATI 00 Antenna
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All sjQiied specrflcotioni ohe opproxlrrcie ond subject to d^onge wlthoui nonce Of obHgorion. All ICOM mdios slgnfficonTiy exce^ FCC r^guJOT^ons lim^FJog spunous emilssJoris. J H J2H3
4
voltage, you can now satisfy
them, literally on the spot
This circuit can go in any
number of directions. A bet-
ter design couid probably
fun an 8080A chip set with
just 5 volts input. If you
have both phases of a con-
venient frequency clock
available, you can slave the
converter to the clock and
save yourself a few parts.
Fig. 3. PC board for the 5-V version.
guaranteeing the converter
start-up in the process. A
couple of VNIOKMs (VMOS)
would probably suffice, pro-
vided only that the clock
signals swing fully rail-to-
raiL (TTL typically needs a
pull-up resistor to hoist its
output above 3.5 voltsj
Somebody else will proba-
bly put me to shame with
the efficiency of their ver-
sion, but thaf s okay; t just
wanted to get that keyboard
running on just a +5-volt
supply Stupid old PMOS,B
DIGITAL
GnOUNO
+av
JUMPEfiS WI-V^/4 ESTABitSH GROUNDING, if ANY
tUI MAY BE 7BIX Oft 79XX DEPENDING ON APPLICATIOM,
TO-92. TO-220. VERSAWATT PACKAGES WILL f IT, >
Fig 4. Component layout
INSTALL DECOUPLING
HERE FOR POSITIVE
REGULATOR
REGtJLATOft
OUT
INSTALL DECOUPLING
HERE FOR NEGATIVE
REGULATOR
here is the next generation Repeater
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18 73 Magazine • April. 1984
I
Breakthrougl
ADVANCED ELECTRONIC APPLJ CAT IONS, INC. was Itie first Company to inlrodyce a smgfe chip microcomputer-based product
{the AD-1 Auto Draler) to the consumer market back in 1977. Since that time. AEA has developed a reputation Jor engineering design
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The fSOPOLE"" patented antenna has caused more excitement in innovative VHP antenna design than
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73 Magazine • April, 1984 19
L fi. Cebik W4RNL
5J0S Hohton Hfik Rmd
Knoxviite TN 37914
Watch That Signal!
Haul out your old oscilloscope and turn it into a
signal monitor. The conversion is easy and the price is right
An external view of the aciaptor show^n in Fig, 8, with shield*
ed connections to the rear of the scope and onward to the
vertical deflection plates.
20 73 Magazine • April. 1984
Oscilloscope adaptors
ror rf have been
around a long time They be*
came popular with the ad-
vent of SSB and inexpensive
scopes after the end of
World War II Today, many
of the leading ham equip-
ment manufacturers, includ-
ing Heath, Yaesu, and Ken-
wood, provide matching
scope units for monitoring
transmitted — and in some
cases, received — signals.
The equipment is excellent.
but so is the price tag. There
are cheaper ways to have an
effective monitor, especial
ly if you are interested only
in seeing your transmitted
signal All you need is a
cheap working scope and a
simple adaptor, Fig. 1 shows
in simplified form what we
need.
As simple as this scheme
is, relatively few hams
FROM
t
t
ADAPTOfl
TO PROVIOC
OEFLtCtiO«
monitor their transmitted
signals or use monitors for
making adjustments. The
part of the equation that
stops most hams is probably
the scope itself and not the
adaptor. There are several
good working designs, and
we shall look at a few before
closing. However, the idea
of owning and then modify-
ing an oscilloscope still
creates anxiety in many
hams. So let's begin by look-
ing at what makes a good
scope for rf work
Choosing a Scope for Rf
Current scope specifica-
tions make the units of even
fifteen years ago look bar-
baric by contrast. The mod-
ern scope has triggered
sweep calibrated in frac-
tions of a second per divi-
sion on the scope face We
can no longer create some
osciu.oscon
Fig. L The basic elements needed for rf monitoring.
of the funny pictures of yore
because the recurrent
sweep, calibrated in fre-
quency, is gone. Virtually all
scopes are solid stale. Dual-
trace capability is the rule
rather than the exception.
The frequency limits of the
vertical amplifier have gone
out of sight. Except for very
expensive lab scopes, a
5-MHz limit was rare twenty
years ago: today, the limit is
fast approaching 100 MHz,
with 20' and 30-MHz units
common One other thing
has kept pace with the rising
Specifications: the price
Modern scopes are excel-
lent. If you own one, then rf
monitoring is a simple mat-
ter of taking an exceedingly
small sample of your trans-
mitted signal and feeding it
directly into the vertical am-
plifier of your scope You
need oo adaptor. Unfortu-
nately, few of us have the
money for a 30-MHz scope
that will get only an occa-
sional workout in the shack*
Indeed, if we have access to
such a piece of equipment,
it will most likely go on the
test bench where it will be
used more regularly.
If we do buy an older
scope, our tendency is to
choose one of recent vin-
tage. This would be a solid-
state scope with at least one
MHz, and perhaps five, as
the vertical amplifier limit
It would have recurrent
sweep and single trace.
I should have stopped the
moment I mentioned solid
state! Although there are
good solid-state scopes ca-
pable of handling the
SOodd volts of rf that we
shall put into the case with
at least an inch or two of
lead, few of the cheap units
have sufficient shielding be-
tween the amplifier boards
and the neck of the scope
tube where our leads are
needed. The odds of pop-
ping one or more transistors
is very great. We can add
shielding, but our chances
of successfully eliminating
all rf danger are slim to non-
existent Modern solid-state
monitors begin with this
problem as a design consid-
eration, and it may be easier
to build a scope from
scratch than to rebuild a sol-
id^tate unit that was never
intended for rf service.
Tube-type scopes of the
next preceding generation
do not suffer the problems
of solid-state scopes A few
volts of rf in the case will not
injure the tubes or other
components. A hamfest will
turn up many of these
scopes for sale. The main
item of concern is the qual-
ity of the cathode-ray tube
and the power transformer.
Both are difficult to replace
and costly at best. If the
scope puts out a bright,
weil-defined trace with the
intensity control at the half-
way point, then other faults
can be repaired with the in-
vestment of troubleshooting
time rather than money.
For an rf monitor at the
operating desk, I prefer a
smaller scope to the round-
faced five-inch models. To-
ward the end of the tube era,
a number of compact three-
inch units appeared, includ-
ing the Eico 435 and 430-
Theflyj " by 6" by 11 " audio
frequency 430 cost $69.95 in
kit form in 1965, and it may
be worth half to two-thirds
of that price at a hamfest if
it is in excellent condition. If
you prefer a larger scope
face, there are numerous
Dumont and Heath models
(among others) th-rit ^ .tn be
picked up for a song and a
few greenbacks.
Getting a scope is half the
battle. Modifying it for di-
rect rf input is simple. Lo-
cate the vertical deflector
plate terminals on the scope
tube socket. As close as pos-
sible to these terminals, in-
stall a pair of connectors on
the rear panel of the scope.
Phono connectors work well
if you use thin coax for the
leads from the adaptor (one
lead for each terminal, since
the signal will be balanced)
Pin jacks or simitar connec-
tors will work if you use
twinlead or other balanced
lines from the adaptor;
m
*flOO¥
CRT
OEFLECTIOM
PLATES
8'
^f
lOOOV
"fh
CT?T
DCfLECTION
PLATtS
^f
^hr
oertEcrioN
i*i*TE5
04 ^P
lOOOV
^^T
Fig. 1. Rf connections to typical vertical amplifier circuits,
(a) Triodo dc<oupled output stu^e. (h) Pentode dc-couplcd
output stage, fcj Pentode ac-coupted output sfage
however, shielded leads are
best, especially with higher
power,
Between the socket termi-
nals and the jacks, install
.OI-jiF disc ceramic capaci-
tors of at least 1000-volt rat-
ing Keep the leads as short
as possible, and try to keep
the capacitors at right an-
gles to anything to which
you might couple signal.
Many scopes used to have
accessory jacks on the rear
panel for any number of im-
probable uses (for example,
dc voltages to power units
under test if they by chance
happened to require exactly
the voltages provided at a
very limited current). If
these are close enough to
the scope lube socket, then
mechanical work will be fur-
ther minimized.
Fig. 2 shows the connec-
tions schematically, along
with some typical vertical
amplifier connections to the
same socket pins. In most
cases, you will need no
other work on the scope It
wilt operate normally when
rf is not present. When using
the scope to monitor your
transmitter, keep the verti-
cal gain at minimum, and if
you have input attenuator
positions, set them at maxi-
mum. For monitoring, we
simply bypass the vertical
amplifier and generate the
voltage needed to deflect
the trace vertically by other
means.
£14 0»
\
* J r~ ^OAPtoR
'n
en J
OCfLECTlOH
PLiTES
*
*
"I.
Or
SEB
ai-DPtiT
^h
10
ADAPTOR
Fig. 3. Isolating rf and nor-
mal scope s/gfia/s,
73 Magazine • April, 1984 21
OPCRATINC PICK Ufr
TAuiswrTcft
SJB
■ 0
flh
^ rT"Tuii*i ^
40
to
1
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TEST PICK UP
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la
lOOpF
TO
I
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f /g. 4. The typical adaptor circuit of the 1960s.
sie
Bfl
PICK up SECT40M
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icenOtt
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Fig. 5, A miniaturized version of Fig. 4, utilizing toroid
cores.
tRMf^MITTER
Fig. 6. A simple rf scope
adaptor in wide use today.
TNaNSWiTTER
m
50 ISO
JWT
•ALUM
2 HI com;
f-5K
TO
OtT
Fig. 7\ The VE7CCK adaptor.
\i you encounter prob-
fems with the use of the
scope for non-rf purposes,
then you wilf want to install
the double-pole, double-
throw switch shown in Fig, 3.
This will effectively isolate
the two modes of operation.
Rf Adaptors
Through the Years
While almost every other
piece of electronic equip-
ment has grown more com-
plex through the years, rf
22 73 Magazine • April, 1984
adaptors for oscilloscopes
have grown simpler I have
built most of the designs,
discarding them as a more
compact arrangement be-
came available. My present
unit fits in a 2''X2"X4''
aiuminum box mounted on
the back of my scope, with
only one switch to manipu-
late. The photo shows how
compact the adaptor can
be We may never reach the
ultimate miniaturization in
anything, but if another
adaptor design comes
along, I will hesitate before
replacing the present unit.
Most early designs used
tuned circuits, one for
each band. Fig. 4 shows the'
general design which was
fairly standard for about a
decade. There were two
separate boxes: a pick-up
unit and a tuning unit. The
pick-up box contained a
one-turn coil running be-
tween the input and out-
put coax connectors, with
a two-turn link running to
the tuning unit. The idea
was to minimize the im-
pedance bump in the trans-
mitter transmission line.
The tuning unit went
through stages of evolution
Initial designs were open
breadboards. You were ex-
pected to tack^older a coil
each time you changed
bands. Plug-in coils fol-
lowed, but they required
you to open the shielded
box which was added to the
design. In 1970, W1KLK
mounted al[ the coils on a
rotary switch (QS T, October,
1970, p 36) He also used the
smallest diameter coils I had
seen to that time, ranging
from V} inch for 10 meters
to 1 V4 inches for 80,
The principle of the de-
sign was to generate the nec-
essary deflection voltage
through the high Q of the
tuned circuit. The tuning ca-
pacitor, insulated from the
front panel and the opera-
tor's hand, provided peaking
when tuned to resonance If
the voltage provided too
much deflection (somewhat
a rarity with older, less sen-
sitive cathode-ray tubes),
detuning the circuit at-
tenuated it effectivety.
Despite its size, the unit
worked very well
The same design can be
significantly miniaturized
through the use of toroid
cores for the inductors
throughout, as shown in Fig.
5. The schematic diagram is
essentially the same, ah
though some changes have
been made in the drawing to
indicate the mechanical
changes A short straight
line with Teflon*^* insulation
runs between the coax con-
nectors and through a half-
inch core. I have used from
6 to 20 turns of #28 wire in
the secondary without dis-
turbing the line impedance
seriously. The tuned circuit
coils in the aggregate take
less room than the switch on
which they are mounted. Al-
though a three-section
switch is shown, I have also
used a two-section switch,
with one side of each coil
(and the capacitor) to a com-
mon. This did not seriously
upset the balance of the out-
put. The entire unit can be
mounted in a single box with
a partition between the
pick-up and tuning sections.
Recent Adaptor Designs
More recently, designers
have realized that tapping a
50- or 750hm coax line
would cause no significant
problems if the tap imped-
ance was fairly high. This
has resulted in the use of al-
most direct connections be-
tween the rf line and the
scope tube. Fig, 6 shows a
generalized idea of the
scheme. The switch controls
a selection of capacitors ar-
ranged to successively dou-
ble the reactance and lower
the signal level seen by the
scope plates. Since the
scope deflection plates re-
quire a balanced input, the
ground side is elevated off
ground The system is per-
fectly adequate for most
monitoring purposes, al-
though a better balance is
easily achieved.
In 1979, VE7CCK present-
ed an interesting scheme
(7j, June, 1979, p. 110); it is
shown in Fig 7 His balun
used an ordinary 2 inch-di-
ameter antenna core. The
swamping resistor across the
core is non-critical in value,
and anything with up to a
three-to-one ratio to the val-
ue given seems to work. It
evens the frequency re-
sponse by lowering the Q of
the coil. However different
his coupling scheme ap-
pears to be from that in Fig.
6, it is electrically identical
He has used a variable ca-
pacitor (with a series fixed
capacitor) to replace the
switch. Like all the units
shown, his works well with
one exception. It is difficult
to find a variable capacitor
with a 150-pF top value that
will go below 10 pF mini-
mum The S-pf value in Fig.
6 is needed when viewing
kW signals on a sensitive
scope tube.
The final design that fits
into the small box shown in
the photo combines the best
of these two designs with
some miniaturization
thrown in. Fig. 8 shows the
circuit. The capacitor sec-
tion is standard. The batun is
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73 Magazine • April, 1984 23
^
^
COBE r 5 TART
WrMDI-NtjS WITH
DOTTED ENDS
TOGETHER J
to
CWT
I SK
4 — •
f fg. 8- The hybrid miniature
scope adaptor
wound on an FT 50^1 core
and is designed for about
1200"Ohms impedance at
3.5 MHz, or about 54 micro-
henries per section. Twenty -
eight turns bifilar, con-
nected as shown, meet the
requirement.
Construction is simplicity
itself As Fig. 9 shows, the
switch t^ mounted on one
side of the U-shaped chan-
nel of the box, the outpLrt
jacks on Sht^ other. A thin
aluminum cover with a ho\v
for the Ctipcicitor UnuI
covers I he wire between
coax connectors. The re-
maining part of the btix
mounts on the rear of tht*
scope, so the unit is almost a
plu^-in device Leads from
the adaptor to the scope are
kept short, partly by careful
thought beforehand on
parts arrangement. Con-
struction can vary according
to what is convenient in
terms of your scope The on-
ly rules to tollow an* the
usual ones about short le^ads
for rf
The response of this adap-
tor is smooth across the ham
bands from 80 to 10 meters,
with no significant dilfer-
ence in the deflection of
equal power signals among
bands. Nor are there any pe-
culiar peaks or other odd
quirks. In !»hort, the adaptor
does Its passive task tamely
but effectively Position 2
on ttie switch is used for the
normal 100-Watt output
from the rig and yields over
an inch of deflection. Posi-
tion 1 permits viewing o^
much tower power signals.
The output from my SB'2UU
produces about an inch and
a half of deflection in posi-
tion 4, thus confirming that
24 73 Magazifte • April, 1984
Interior view of the adaptor shown in Fig. S. The metal
shield near the top covers the through tine from transmitter
to antenna, white tlw switch holds the capacitor-divider.
The broadband tran^iormer balun is mounted between the
output jacks at the tower right. The ^rnatl perfboard holds
an envelope detector for synchronizing the scope's sweep
the capacitor choice is ade-
quate for the most common
range of ham signals The
scope which the adaptor
feeds, incidentally, is an
Eico 430,
Using the Adaptor
Synchronizing the moni-
tored signal to the scope
sweep is desirable but not
essential to the observation
process. It is useful and pos-
i*F m •-
— Vyv-
IN34, IM5Z, ETC
a)
-o 0^ OR AF OUT
/Tt
TO
- tlORtlOMTAL
ST«C
OSC*LLftTOn
5YNC
UMlTEfl
TO
QETECTOf^ ^AV HOT IVORPl
SfNC 1M
DETCCTQH St«OULlX ttOfflt
Fig. 10. A stmple envelope detector for linearity checks and
sync, ia) Envelope detector, (b) Scope sync systems.
fig. 9. Physical layout of the
hybrid scope adaptor.
sible with CW dots or dashes
sent at a constant rate (easi-
ly done with an electronic
keyer) and with two-tone
[vsi^ on S5B. For the usual
Christmas-tree pattern seen
in casual monitoring of SSB
or for AM trapezoidal pat-
terns, sync is useless.
Nonetheless, the technique
for deriving a sync voltage is
simple in principle and
deserves mention.
Fig. 10(a) shows a simple
AM detector typical of
those found in rf probes.
With the isolating resistor,
its output is very tow^ too
low to drive the external
sync connections on many
scopes The problem be*
comes clear in Fig. 10(b),
block diagrams of two types
of sync inputs. In one case,
external sync is amplified
before going to the sync lim-
iter. In the other, sync voft-
age goes directly to the tint-
iter. A small external sync
voltage cannot drive the
second circuit without fur-
ther ampiificatioa For two-
tone testing SSB signals, an
audio amplifier works well,
but for CW, a dc amplifier is
better, If your scope has a
stable sweep oscillator, this
additional circuitry adds lit-
tle to the effectiveness of
monitoring, but it does cre-
ate a need for feeding power
to the adaptor which is
otherwise a passive device.
For standard linearity pat-
terns, of course, a pair of de-
tectors is needed, but since
the regular horizontal and
vertical inputs of the scope
are used for the test no
power source is needed
Using the monitor is an
easy process. Connected as
shown early in the article,
the adapted scope will dis-
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Apple. Atan, IBM. Commodore computers, etc But^l-m
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Sensor box locales up to 4 ft away. 3^""7"w*6"d.
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Hulti-PSlO (right) 10 KOhm/VVOM and 20/200wRF
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Originally $49 - Closeout $24^^
AEA Microphone for NT's
llectret type with volume control,
Plug wired for all ICOM handhelds.
Model HTM Closeout SS^^
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73 Magazine • April 1^B4 2S
Farts List
1 Single-pole, 5-position rotary
switch
1 FT 60^1 ferrite toroidal core
#28 enamel wire (26 bifilar
turns on core)
2 S0^238 coax sockets
2 phono socl^ets
1 rSk-Orim, Vi-Watt resistor
1 40*pF silver mfca capacitor
1 20-pF silver mica capacitor
1 10-pF silver mica capacitor
1 5-pF siJver mica capacitor
1 2,5-pF (or two 5-pF in series)
silver mica capacitor
1 2V4 ' k2V4 * x 4' aluminum
utility box
Radio Shack and other sources
Amidon and other sources
Radio Shack and other sources
Radio Shack and other sources
Radio Shack and other sources
Avaifatjie frorn mail-order
sources such as Semiconduc-
tor Surplus
Note: disc ceramic capacitors
with 350-valt or higher ratings
wilt substitute for the silver
micas
Radio Shack and other sources
Total cost: $10, if all parts new; under $5 with surplus and/or used
parts.
play CW waveforms, plus
two-tone and Christnnas-
tree SSB patterns. No better
observation of CW make-
and-break patterns has been
invented, and the results of
adjustments to component
values become immediately
apparent. With respect to
observation of SSB. the sim-
ple adaptor technique might
be considered somewhat ar-
chaic. A spectrum analyzer
will in fact provide more
sensitive indications of in-
correct linear-amplifier ad-
justment. However, a spec-
trum analyzer is an expen-
sive piece of equipment.
The two-tone test pro-
vides good indications of
improper amplifier adjust-
ment if the operator takes
the time to become person-
ally familiar with and sensi-
tive to the meaning of the
curves. Handbooks of a few
years back provide ample
drawings of various condi-
tions of operation and their
meaning.
Some recent materials on
the subject have bent over
backward to discredit our
ability to read two-tone en-
velope patterns effectively.
This is true only if we do not
thoroughly learn the pecu-
liarities of our equipment
The idiosyncrasies of each
amplifier and each scope re-
quire that we make exten-
sive on-the^air and dummy-
load tests to discover at
what point slight flattening
of the pattern top, or slight
curvature to the pattern
sides, means distortion of
our voices or adjustments of
the drive or loading which
are out of spec We may not
be able to match laboratory
results, bul we can keep our
rigs well within FCC regula-
tory requirements and well
within what courtesy to
other operators dictates.
Despite the fact ihat rf
adaptors for old audio
scopes have been supplant-
ed by more sensitive meth-
ods of monitoring, it will be
a long time before we can
all afford up-to<lale test
equipment. In the interim, a
small investment [maybe
$30 to $50 for a used scope
and $5 for the monitor) can
go a long way toward help-
ing us put out cleaner sig>
nals. The tiny monitor box
shown here (which might
even fit inside some of the
large old scope cases)
makes the process of moni-
toring one step easier 1 only
wonder how small the next
monitor design will be H
• TECHNICAL FORUMS
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April 27,28.29. 1984
Hara Arena and Exhibition Center — Dayton, Ohio
Meet your amateur radio friends from all over the world at the internationally
famous Dayton HAMVENTION.
Seating will be limited for Grand Banquet and Entertainment on Saturday
evening so please make reservations early. Many Dannals. W2HD. Past Presi-
dent ARRL will be featured speaker.
If you have registered within the last 3 yeara you will receive a brochure in
January. If not, write Box 44, Dayton, OH 4540 1 .
Nominations are requested for Radio Amateur of the Year and Special Achieve-
ment Awards. Nomination forms are available from Awards Chairman. Box 44,
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For special motel rates and reservations write to Hamvention Housing. Box
1288. Dayton, OH 45402. NO RESERVATIONS WILL BE ACCEPTED BY
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All other Inquiries write Box 44. Dayton, OH 4540 1 or phone (51 3) 433-7720,
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Entrance for set-up available starting Wednesday. Special Flea Market tele-
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Bring your family and enjoy a great weekend in Dayton.
Sponsored by the Dayton Amateur Radio Association, Inc.
28 73 Magazine • Apri!, 1984
i
I
I
^_
You can DX and receive weather
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73 Magazine * April, 19a4
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73 Magazine * April, 1984 29
ioseph I. Can K4iPV
5440 South 8th Rosd
Afitngton VA 22204
Digital Design:
How to Interface ICs
Connect ICs to the outside world with these hints
from the author of '"Digital Basics/'
The reader response to
my three-part series ti-
tled "Digital Basics" (7J,
September through Novem-
ber, 1982) was overwhelm-
ing even to an old tech-writ-
ing hack like myself In addi-
tion to receiving more than
a dozen positive letters (and
no negative ones), I received
a consulting offer; writing
for 73 surely pays!
One theme which popped
up In about one-third of the
letters was digital interfac-
ing. Readers wanted to know
how to interface various dig-
ital \C logic families with
each other and with the
"outside world/' In this ex-
tension of the original series,
we will discuss interfacing
♦5V0C
"•OUTPUT
Fig. 1(al 771 totem-pole out-
put
•-OUT^sUT
Fig. 1(b). TTL operhcotJector
OU0Ut
30 73 Magazine • April, 1984
techniques and how they
can be applied in practical
situations.
Logic Family Outpub
and Inputs
Most readers will be using
either the transistor-transis-
tor-logic (TTL) or comple*
mentary-metal'Oxide-semi-
conductor (CMOS) and re^
la ted MOS families. These
will be the devices discussed
in this article.
Before we can become
too deeply involved in any
discussion on interfacing,
we must become familiar
with just what is being inter-
faced. For digital electron-
ics, this means a review of
the input and output circuits
of the devices, since these
are what will be connected
together.
The TTL logic family op-
erates from a single-polarity
dc power supply of + 5 volts
dc and ground. This supply
must be regulated to keep
the voltage within a narrow
range— 475 to 5 2 volts.
IMPUT A «-
W«PUt H •-
i
Some texts permit slightly
broader limits, but practical
experience indicates that
voltages lower than +4,75
volts cause erratic opera-
tion, especially of complex
function devices, while po-
tentials over about +5.2
volts lead to premature fail-
ure of large numbers of
chips. I personally prefer to
keep the potential within
the even narrower range of
+ 4.9 to +5.05 volts dc.
The TTL output stage is a
current sink to ground, while
the TTL input is a current
source. Figs. 1(a) and 1(b)
show two popular forms of
TTL output while Fig. 1(c)
shows a typical TTL input
circuit. The high and low
logic levels in TTL are speci-
fied in terms of the voltages
that satisfy the input re-
quirements.
The high level will be any-
thing between +2.4 volts
and +5.0 volts. In most TTL
devices, the output will pro-
duce a potenfiat greater
than +2,4 volts for high, but
•IVSC
Fig. 1(cl TTL inputs.
considerably lower than +5
volts; potentials in the 3 0-
to-4.0-volt range are most
frequently found. The low
condition is defined as any
potential between 0.0 volts
and 0 8 volts, i.e., 800 milli-
volts. The region between
0.8 volts and +2.4 volts is
undefined and is therefore
to be avoided- One problem
seen in some interfacing sit*
uations is the creation of a
circuit that wilt not bring the
outputs to within the de-
fined high and low limits,
thereby creating an unpre-
dictable situation.
One advantage of using
IC logic elements is that we
are free to avoid the prob-
lems of impedance matching
{and other related head-
aches) when connecting the
devices together in cascade.
We can use the concepts of
fan-in and farhout. The term
fan-in defines the load pre-
sented by any device in
terms of standard TTL input
loads. Since the TTL input is
little more than a 1.6-mil-
liampere current source, we
define a fan-in of 1 as a cur-
rent source of 16 mA, at
standard TTL logic voltage
levels. The farnjut is the
drive capacity of a logic de-
vice defined in terms of the
number of standard 1.6-mA
TTL loads that the output
will drive. In most devices,
the fan-out is ten, so the
device wilt successfully
drive up to ten standard TTL
loads. (In other words, it has
a 16-mA output current sink
capacity.) Some special de-
vices called buffers or tine
drivers typically will have
fan-outs of thirty, but up to
one hundred are known.
Most TTL devices have
an output circuit such as
the one shown in Fig. 1(a).
The output circuit is a
totem-pole power amplifier
consisting of two NPN tran-
sistors, A blocking diode
prevents current flow from
the output terminal through
Q1 to the +5-volt power-
supply line. When the out-
put is low, transistor Q1 is
turned off and Q2 is turned
on. This places the output
line at or near zero volts.
The actual potential will be
the Vce(sat) rating of Q2,
which may be as much as
0,8 volts. In the opposite
condition, when the output
is high, the opposite occurs:
Transistor Ql is turned on
and R2 is turned off. This
places a potential on the
output line that is the
+ 5-volt power-supply volt-
age less the Vce(sat) rating
of Ql and the junction drop
of the series diode (normally
0,6 to 0,7 volts).
An alternate form of TTL
output is the open-collector
circuit of Fig. 1 (b). The open-
col lector device is used to
drive external devices and is
a prime tool in interfacing
with other togic families as
well as with the ''outside
world/' Transistor Ql will be
connected to the V + (which
is not always +5 volts, even
though the package power-
supply voltage must be -h5
volts dc) through a pull-up
resistor or another form of
load. Normally, if a simple
pull-up resistor is used for
the load, we will need 2000
to 3000 Ohms for +5-volt
power supplies, and propor-
tionally higher for higher po-
tentials, TTL devices with
open-collector outputs in-
clude the following hex in-
verters: 7405 (+5-vott sup-
ply only), 7406 (to + 30 volts
at up to 30 mA), 7416 (to
+ 15 volts at up to 40 m A),
and the following hex non-
inverting buffers: 7407 (30
volts, 30 mA) and 7417 (15
volts, 40 mA). These devices
are of prime concern for our
interfacing chores. Note
that certain other TTL de-
vices also have open-collec-
tor outputs.
An example of a TTL in-
put circuit is shown in Fig.
1(c). The device shown here
is a two-input circuit as is
found in each section of a
device such as the 7400 two-
input NAND gate, Each in-
put will source up to 1 .6 mA
of current
A CMOS inverter circuit
is shown in Fig. 1(d), The
typical CMOS device will
have a pair of complemen-
tary MOSFET transistors con-
nected in series with the out-
put taken at the junction be-
tween the two. Transistor
Ql is a p-channel MOSFET,
while Q2 is an n-chanoel
MOSFET. These devices
have opposite properties
such that Ql will be turned
off (high-resistance channel)
by a high applied to the in-
put, while Q2 is turned on by
a high on the input. Thus, for
each different binary logic
level, we will always have a
series circuit consisting of a
high resistance and a low
(approximately 200 Ohms)
resistance. For output-low
conditions, there will be a
high resistance to V+ (Ql
off) and a low resistance to
V — [Q2 on). For the output-
high condition, exactly the
opposite occurs: there is a
low resistance to V+ (Ql
on) and high resistance to
V - (Q2 off).
Thus, we will see the
CMOS output sink current
on low and source current
on high. Although this fact is
not needed when interfac-
ing CMOS-to-CMOS, it is
useful for other interfacing
chores.
The CMOS input is essen-
tially an open circuit. CMOS
devices operate using elec-
trostatic fields derived in the
channel from potentials ap-
plied to the gate terminal.
This terminal is insulated by
a thin metal-oxide layer and
thus represents an immense-
ly large resistance. Various
v +
IMPUT *-
« OUTPUT
V- OR ^
Fig. 1{d]. CMOS inverter, showing inputs and outputs.
authorities quote not less
than 1 megohm, with some
going to 10^^ Ohms, Thus,
many CMOS devices can be
driven from the same output
with regard for current-
driven capability. There
may, however, be capaci-
tance limitations, especially
where a rapid rise time must
be maintained.
Interfacing Between
Logic Families
Fig. 2 illustrates some of
the circuit situations re-
quired to interface between
CMOS and TTL devices. Or-
dinarily, a single low-power
(74 L) or low-power Schottky
(74LS) TTL device can be di-
rectly driven from a CMOS
output, provided that the
CMOS device is operated
from a +5-volt power sup-
ply and ground. Normally,
CMOS devices can operate
with ±V of ±4.5 to ±15
volts dc; furthermore, these
supplies need not be equaL
We could, for example, oper-
ate from V+ =5 volts, and
V— =0 volts (grounded). It is
only this latter situation that
will accommodate Fig. 2(a).
Here the CMOS device will
directly drive the 74L or
74LS TTL device. These TTL
devices operate from lower
current levels than does reg-
ular TTL.
Two specific CMOS de-
CMOS
DEVICE
>-
OWE 741. OR T4LS
TTL INPUTS
Fig. 2(a). CMOS'to-74L or
-74LS devices.
>
4001 /40DZ
CMOS DEVICES
>
TTL INPUT
Fig. 2(bl 4001/4002 CMOS will
drive one regular TTL load.
vices will directly drive a sin-
gle regular TTL input: the
4001 quad two-input NOR
gate and the 4002 dual four-
input NOR gate. See Fig.
2(b). Note that the B series
CMOS (4001 B) would prob-
ably drive more than one
input
Fig. 2(c) shows the use of
the 4049 or 4050 devices-
These devices are hex in-
verter and hex non-inverting
buffers, respectively. They
are specially designed to di-
rectly drive up to two regu-
lar TTL inputs (output cur-
rent of 3.2 m A) provided that
the 4049/4050 package is op-
erated from +5 volts and
ground, rather than some
other V + /V— combination.
In Fig. 2(d) we see that a
TTL output will drive a
CMOS input (actually, sev-
eral can be accommodated)
provided that there is a cur-
rent source. Recall that the
TTL output wants to see a
1.6-mA to 16-mA current
source for its load, while the
CMOS input is an extremely
high impedance. In order to
keep the TTL device operat-
ing properly, we must pro-
>
ANY TWO
TTL INPUTS
>
Fig. 2(c). 4049 and 4050 CMOS
devices will drive up to two
regular TTL loads.
>
TTL
DEVICE
2 K - 3K
O
CMOS
IWPUT
Fig. 2(d}. TTL-to-CMOS (operat-
ed from + 5 volt supply).
73 Magazine • April, 1984 31
o
V*
1
*4 TO *ia
?4tT
^
GVQS OPERATED AT
|V*| > H3VDC1
f/g.2fej. TTLtaCMOS (operat-
ed from V'\- greater than +5
votts, and V— =0 volts).
OF Vice
ClilOS
DEVICE
Fig. 2(fl TTUo-CMOS [operat-
ed from ± V supplies}
vide a 2 to 3k-Ohm pull-up
resistor between the TTL
output and + 5 volts dc. We
must limit this method to
those cases where the TTL
voltage levels are compati-
ble with the CMOS. If the
CMOS device is operated
from +5 votts and ground,
then there is no problem.
Recall from the previous
series on digital basics that
the CMOS device output
will go through a high/low or
low/high transition when the
input voltage is midway be-
tween the V+ and V^ volt-
ages. If, for example, the
supplies are +5 volts and
ground, then the transition
occurs close to +2,5 volts.
But; if the supplies are ±T2
volts (or any other legal po-
tential), then the transition
occurs near zero. Similarly,
if the potentials are V+ =1 2
volts and V— =6 volts, then
the transition point is
y3[( + 12)-(-6)]=W( + ia)
or +9 volts. If this method
were used in the latter case,
the input of the CMOS de^
vice would jump back and
forth between two 'iegal"
tow potentials, so the output
5V0C
■i?
1^ t
2ZK
H-TYPE
y*
IK
ft-TT*¥
CMO$
if
>-^
Dl
LIGHTS am
OgtPWT LOW
Fig. 3(a}. CMOS //ght-on-out-
put'low LED interfacing,
would never toggle In Fig.
2(e} we show you how to
deal with that problem.
For those cases where the
CMOS device operates from
power-supply potentials
other than +5 volts and
ground, we will need a cir-
cuit such as the one in Fig.
2(e). Here we will use one of
the "high-voltage'' hex in-
verter IC devices discussed
at the beginning of this arti-
cle: 7406, 7407, 7416, and
7417 are candidates; 7405
can operate only from +5
volts, so it is ruled out Note
that the package power*sup*
ply voltage for these TTL de-
vices must remain at +5
volts only, but the voltage
applied to the open-col-
lector output transistor via
the pull-up resistor can be
up to the CMOS V-h limit of
+ 15 volts dc A lOkOhm
pull-up resistor will suffice.
Fig. 2[f) shows how to in-
terface the TTL device with
CMOS devices that are op-
erated from bipolar power
supplies instead of V — = 0.
In this circuit, we use a
MOSFET transistor (or one
section of the CMOS 4007
device) in between the two
logic devices. Resistor R1
provides a current source
for the TTL output, while R2
limits the MOSFET current
to a safe value and develops
the potential applied to the
CMOS input VH- and V—
must be nearly equal.
Finally, in Fig. 2{g) we see
a circuit that has a certain
universality. In most cases,
-^W*"
/tr
^""
F/g- 2fgjL Universaf TTL to other logic devices,
32 73 Magazine • April, 1964
>
I HOI I
LEO
Fig 3(b). CMOS light-orhout-
put-high interfacing,
the function of this circuit
will be to interface TTL to
certain other higher-voltage
logic families (such as
CMOS operated from sup-
plies over -1-5 volts, HNIL,
HTL, etc.) In the majority of
such instances, you will use
a 7406, 7407, 7416, or 7417
device in place of transistor
Ql, but this circuit may
prove useful in some sit-
uations.
For example, in an ex*
isting device, there may be
too little room to add an IC,
but plenty of room to
kludge on a 2N2222 or simi-
lar transistor. This situation
turned up one time when I
worked for a medical school
electronics laboratory. It
seems that one of the re-
searchers had an elderly fre-
quency/period counter that
used zero and -1-12 volts as
the logic levels, yet she
wanted to interface this
counter to a modern instru-
ment that provided TTL out*
put levels. The solution was
to kludge R1-R3 and Q1 on-
to the PC board inside of the
older instrument, and create
a new input.
Register R1 is used, regard-
less of whether open-col-
lector logic is used, and
serves to provide a current
for the TTL output to sink.
When the TTL output is low,
point A in Fig. 2(g) will be at
zero potential, so the base
of Q1 is turned off. Under
this condition, the output is
high (inverted). Similarly,
when the output of the TTL
device is high, the potential
at point A is 3 to 4 volts, so it
can bias the base of Ql on,
Under this condition, the
transistor is saturated and
will produce a low output.
This method is useful so
long as an inverted output is
sufficient Otherwise, cas-
cade two similar stages. I
fli
<S§)
->-^
TTL QCVICE WltM
Fig 3fci TTt opefhcol lector
LED inferfacing (circuit will
also drive very'low-current
tampsX
suspect, however, that any
situation where cascading
twoQl stages is feasible will
also permit the kludge of a
14-pin DIP, thereby making
the use of the hex inverter
the preferred method.
Interfacing Lamps and LEDs
Incandescent tamps and
light-emitting diodes (LEDs)
are often used in digital in-
struments to indicate logic
status or to signal some
event like the completion of
a process, etc. The B series
CMOS devices can often be
interfaced directly with
light-emitting diodes, pro-
vided that no more than
about 15 mA of current will
light the LED to an accept-
able brightness (the usual
case). The A series devices
are not able to do this neat
trick because they have as
little as one-third the current
sinking/sourcing capability
of the B series devices.
Figs. 3(a) and (b) show the
use of direct interfacing be-
tween a B series CMOS de-
vice and the low-current
LED. The circuit in Fig 3(3)
uses the LED as a pull-up be-
tween the CMOS output
and the positive power sup-
ply and wilt cause the LED
to light on any output4ow
condition. The CMOS out-
put in this case operates as a
current source to ground. In
Fig. 3(b), the LED is con-
nected between the CMOS
output and ground and will
light only on output-high
conditions. In this case, the
CMOS output is used as a
current source.
Fig. 3(c) shows the use of
an open-collector TTL de-
vice to drive the LED. If V +
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73 Magazine • Apfll, 1984 33
>
CliOS
m
4T0
fig. Jfcft /n candescent tamp in-
tracing with PNP transistor.
svnc*
•;
m
««
TTL OH
CWOS
74}Cl Oft T4ir
Fig. 3(el Incandescent iamp in-
terfacing with NPN transistOL
is +5 volts, then the 7405
device may be used. The
7406, 7407, 7416, and 7417
devices may also be
used at +5 volts or any
potential up to the rated
potential for the specific
device (-hi 5 or +30, de-
pending upon type) Resistor
R1 is used to limit the cur-
rent through the LED and
the TTL output to a safe
value, usually 15 mA. The
value of R1 is given by
Ohm's law: R1=(V + )/Iled
or V + /0.015 if the 15-mA
figure is acceptable. In this
circuit, the TTL device
operates as a current sink
for the LED and will light on
output-low.
Incandescent lamps typi-
cally draw a lot more cur-
rent than LEDs. Some small
current lamps ("grain-of-
wheat" lamps) will operate
directly from the 7417 TTL
device, but most require too
much current for safe opera-
tion directly from TTL. We
can, however, use the TTL
(or CMOS) device to drive a
transistor switch that will, in
turn, operate the lamp or
other load. This situation is
depicted in Figs. 3(d) and
3(e). In Fig. 3(d) we see the
use of a PNP transistor to
turn on the load When the
base of Q1 is made low,
then the base-emitter poten-
tial is proper to turn on tran-
sistor Q1; current will flow
in the c-e path to the load. If,
34 73 Magazine • April J 984
t
>
TTL W
CMOS
Fig. 4. Driving large loads using Darlington-pair transistors.
however, the logic output is
high, then the base-emitter
voltage is nearly zero, so the
transistor is cut off.
Fig. 3(e) shows the use of
an NPN transistor for Q1.
While the lamp in Fig 3(d)
writ turn on for output-tow,
the circuit shown in Fig. 3(e)
turns on for output-high,
Again, either TTL or CMOS
devices can be used, within
certain limitations. One limi-
tation applied to TTL de-
vices is that a putl-up resis-
tor (Rl ) be provided so that
the TTL output sees a cur-
rent source. For CMOS de-
vices, we must use a transis-
tor that has a high enough
beta gain that it will saturate
with the current available
from the CMOS output. Re-
sistor R2 is used to limit the
current applied to the base
of Q1 , When the IC output is
high, then a current flows in
R2 that will turn on the tran-
sistor Under that condition
Q1 IS saturated, so its collec-
tor will be at or near ground
potential This condition
makes the load see a current
flow, so if it is a lamp then it
will light up.
Large loads, i.e., those of
high current but limited
voltage, can be accommo-
dated with the circuit of Fig.
4. Here we extend Fig. 3(e) to
account for the higher cur-
rents of the toad, There are
two transistors used in this
circuit In most cases, we
will use a ''driver" transistor
such as the 2N3053 for Q1
and a "power' transistor
such as the 2N3055 for Q2.
Note that some semicon-
ductor manufacturers offer
TO-3 packages containing
both Q1 and Q2 and term
the combination 'Darling-
ton'' transistors after the
fact that the circuit in which
these transistors are con-
nected is catted a "Darling-
ton amplifier" or "Darling-
ton pair"
The advantage of this cir-
cuit is the amplification of
beta (Hfer) that occurs. The
total beta is the product of
the individual beta ratings,
or: Hfe^total) = Hfe(Qi)
xHfe(Q2)- If you recall your
basic transistor theory, the
beta is defined as the collec-
tor current divided by the
base current, or Ic/'b For ex-
ample, if the beta of Q1 is 80
and the beta of Q2 is 50,
then the total beta is (80X50)
or 4,000. The implication of
this is that the drive current
need only be 1/4000 of the
load current! Let's assume
that there will be approx-
imately 1.2 mA available to
drive the Darlington pair
when the TTL output is high.
With a beta of 4000, the
load current will be more
than 4 Amperes 1 Of course,
a transistor must be selected
for Q2 that will "hack" the
current of the load.
The diode shown in parai*
lei with the load is advisable
for all creative (capacitive
or inductive) loads, and for
most very high current
loads. It is especially neces-
sary in inductive-load cir*
cuits, for example, when the
load is a relay or solenoid
coif The problem is the in-
ductive spike produced by
an inductor energized with
dc when the circuit is inter-
rupted. Under this circum-
stance, the energy stored in
the magnetic field around
the inductor will collapse
{
I
HI
Di
>
JM
TTL {>EVlCE
Fig. 5fa) Interfacing opefhcol-
lector TTL to low-current
relays.
and the counter-electromo-
tive force generated will be
opposite the polarity of V-F
and will have a very high val-
ue (kilovolts are possible).
It you have studied calcu-
lus, then you will see that V
= L(dl dt) can reach a very
high number in the situation
where the current flow is
abruptly terminated [di/dt is
negative and has a rapid fall
time).
The diode is reverse-
biased most of the time but
will conduct when the
CEMF potential is applied.
Since the potential can easi-
ly reach hundreds of volts in
practical situations, the
diode must have a piv rating
of 1000 volts or more. I rec-
ommend 1N4007 for all but
very heavy inductive loads;
for heavier cases, use series-
connected 1N4007 devices
with each diode shunted by
a 470k-Ohm-to-1-megohm,
Vi-Watt, carbon resistor
Fig. 5 shows two situa-
tions where electromechani-
cal relays — those work-
horses of electricity/elec-
tronics left over from the
19th century but still via*
ble — are interfaced with
digital IC devices.
In Fig. 5(a) we see the use
of an open-co I lector TTL
device for directly interfac-
ing with a low-current relay.
Some manufacturers offer
low-current (40*mA and
under) relays, both in regular
relay packages and in
packages resembling IC
packages (both metal-can
and DIP packages are
available). Keep in mind the
voltage and current limita-
tions of the 740b, 7407, 7416,
and 7417 devices listed at
the beginning of this article.
For heavier relays, we will
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73; Amateur Radio's Technical Journal • Box 931 • Farmingdale, NY 11737
344FS
I
73 Magazine * Apr! I J 984 35
»s»oc
TTL>0-
m
a.7K
CGNTACTS
Fig. 5(b}. Interfacing TTL or CMOS to higher-current relays.
the high voltage transient
will blow the senniconductor
Relays are used for many
applications. Of course, if
the current is too high to be
conveniently handled by the
semiconductor, then a relay
is in order But. today, we
have numerous high-current
power transistors and Dar-
lington devices, so this ap-
plication Is fading. The isola-
tion provided by the relay,
however, makes it attractive
whenever the logic device
must be interfaced with a
high-vottage circuit, or the
ac power lines (115 volts ac).
Finally, we see one fur-
ther method for providing
isolation between a digital
Fig 6. Drivingan isolated load
use a switching transistor, as
in Fig. 5(b). This is merely an
extension of the earlier cir-
cuits. The diode transient
suppressors are mandatory,
however, If these are not
used, especially in Fig. 5(a),
circuit and some outside-
world load. There are de-
vices called optoisolators
(Fig. 6) available in which an
LED and either a phototran-
sistor or a photodiode are
placed such that the LED
will illuminate the transis-
tor/diode (whichever). The
pair is housed inside of an
opaque DIP package that
has the same 0.1 " X 0.3" pin-
outs as the digital IC devices
in the circuit. When the LED
is turned on, i.e., when the
logic device output is low,
then the phototransistor
base is illuminated, so the
transistor is turned on. Un-
der this condition, the out-
put will be a potential close
to V+. When the LED is
extinguished, i.e., when the
logic output is high, then the
phototransistor base is
turned off and there will be
no voltage across the load
resistor In most cases, the
dangerous isolated circuit
will be on the transistor side
of the optoisolator In some
cases, however, the danger-
ous side of the citcuit will
send the signal and thus will
be on the LED side.
Conclusion
The advantages of digital
logic are even greater when
we can interface either be-
tween logic families or to
the outside world. The tech-
niques in this article allow
us, among other things, to
interface elderly digital
equipment obtained on the
surplus market to modern
equipment, or to interface
essentially non-digital cii^
cults (control) that are still
binary in nature to some dig-
ital instrument For exam-
ple, a trivial case would be
the push-to-talk circuit on a
transmitter. As another ex-
ample, the transmitter con-
trol circuit on a linear power
amplifier could be placed
under control of a computer
in which the digital inter-
facing is between a 3.2 mA
(fan-out — 2) output port
terminal and the radio equip-
ment. Lots of luck.B
-^148
COHfff ODOR£ 64'
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36 TSMagazirm * April, 1984
PRIVATE PATCH II
THE ULTIMATE SIMPLEX AUTOPATCH
PRIVATE PATCH II is for the discriminating amateur
who demands the finest in simplex autopatch perfor-
mance, features and quality. Our digitafly processed
VOX and simplex loop create a level of communica-
tions quality which is not even closely rivaled. Please
. , , do not confuse our technique with sampling!!
PRIVATE PATCH II has the following major advan-
tages over sampling type autopatches:
• Compatibte with every known transceiver — yes, synthesized
arxJ relay switched types included.
• No transceiver modifications are ever required!
• Connects only to MIC and external speaker jack— no inter-
nal connections to your transceiver required.
• Natural push to talk operation — no need to pause— you rrey
talk the instant the button is prassed.
• Much greater range — noise on your weak mobile signal
causes no performance degradation. (Noise sampled auto-
patches fail to operate when your signal becomes r>oisy.)
• Private Patch 11 offers natural 'Take-turns" style of communi-
cations in the manner you are used to. There are no annoy-
ing sampling kerchunks and missing syllables punched out
of every other word.
• in addition to supertD simplex operation, Private Patch It will
operate through any repeater from your base location. Yes,
any repeater! Tone encoding equipment and repeater modifi-
cations are not required.
b
STANDARD FEATURES
CW identification— ID ROM chip included.
Single chip XTAL controlled tone decoder.
Tone to pulse— compatibility with all telephone systems—
eliminates critical tone adjustments in the mobile — ^no wrong
numbers, ever! Can be strapped for straight tone dialing.
Speed dialer compatible— can consume up to 15 digits per
second.
Sophisticated toll restrict logic— user programmable restrict
• Five digit access code— 59,049 user programmable code
combinations! (Their three digit code beginning with * has
less than 196 combinations.)
► Ringback (reverse patch)— alerts you with CW ID.
» Busy channel ringback inhibit— will not send CW ID alert if
channel is in use — defeatabie.
• Three/six minute "timeout" timer— resettabte from the
mobile— four CW ID warnings during final minute,
• Control interrupt timer- assure reliable and positive control.
• Self contained 115V AC supply— 230V 50«0 Hz available at
slight additional cost.
• Modular phone jack— and seven foot cord,
• 14 day return privilege — when ordered factory direct
• One year factory warranty.
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PHONE (213) 373-6803
73 Magazine • April, 1984 37
4
NOSH
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)HAF
IGES!
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TUBES
■ !
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$ 28.90
813
$ 42.50
7843
$ 90.95
2E26
6.75
1 1 82/4600A
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2K28
170.00
4600A
426,00
ML7855KAL
106.25
3-500Z
86.70
4624
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7984
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4657
71.50
8072
71.50
3B28/866A
8.10
4662
85,00
8106
4.25
3CX400U7/8961
215.00
4665
425,00
8117A
191,25
3CX1000A7/8283
447.00
5675
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8121
93.50
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482.00
5721
212,50
8122
93.50
3CW30000H7
1445.00
5768
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8134
399,50
3X2500A3
402.00
5819
101,00
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482.00
5836
198.00
8233
51.00
4-65 A/81 65
58.65
5837
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8236
29.75
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67.15
5861
119.00
8295/PL172
425.00
4-250A/5D2Jr
83.50
5867A
157,25
8458
29.75
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83.50
5868/AX9902
229.50
8462
110.50
4-400B/7527
93.50
5876/A
35,70
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80.75
4-400C/6775
93.50
5881/6L6
6.80
8533W
115.60
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377.50
5893
51.00
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63.75
4CX250B/7203
46.00
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85 60 AS
85.00
4CX250FG/8621
63.75
5894B/8737
46,00
8608
32.30
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102.25
5946
335,75
8624
85.00
4CX250R/7580W
76.50
6083/AZ9909
80,75
8637
59.50
4CX30aA/8167
144.50
6 146/6 146 A
7.25
8643
70.55
4CX350 A/8321
93,50
6146B/8298
9.00
8647
142.80
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97.75
6146W/7212
14.75
8683
80.75
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119.00
6156
93.50
8877
395.25
4CX600J/8809
710.00
6159
11.75
8906
11.05
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206.00
6159B
20,00
8950
11.05
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412,25
6161
276,25
8930
116.50
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471 .00
6280
36.25
6L6 Metai
21.25
4 CX 5000 A/8 170
935.00
6291
153,00
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4.25
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1067,00
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20,50
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4.60
4C XI 5000 A/8281
1275.00
6360/A
4,85
6CL6
3.00
4CW800F
603.50
6399
459.00
6DJ8
2.15
4D32
204.00
65 50 A
8,50
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5.60
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204.00
6883 B/8032 A/8552
8,50
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5.00
4PR60A
170.50
6897
136,00
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5.30
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283.25
6907
67.15
6GK6
5.10
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148.75
6922/6DJ8
4.25
6HB5
5.10
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501.50
6939
18.75
6HF5
7.45
4X150A/7034
51.00
7094
212,50
6JG6A
5.35
4X150D/7609
81.00
7117
32.75
6JM6
5.10
4X250 B
38.25
7211
85.00
6JN6
5,10
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38.25
7213
255.00
6JS6C
6.15
4X500A
350.00
7214
255.00
6KN6
4.30
5C XI 500 A
561 .00
7271
114.75
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7.00
KT88
23.50
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28.90
6LF6
5.95
416B
38,25
7360
11.50
6LQ6 G.E,
5.95
416C
53.00
7377
72.25
6LQ6/6MJ6 Sylvarna
7.65
572B/T160L
42.50
7408
2.10
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7.55
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179.50
7609
80.75
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807
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7735
30,60
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NICORN ELECTRONICS 213-341-8833
10010 Canoga Ave, Unit B 8, Chatsworth, CA 91311
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^203
38 73 Magazine • April, 1984
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19.99
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17.59
MRF304
36.95
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21.25
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9.39
MRF309
28.75
2N2857JAN
3.49
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15.30
MRF314
24.25
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3,49
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2295
MRF315
24.55
2 N 2876
11.49
2N5836
2.95
MRF317
64.35
2N2947
15,60
2N5842
7.20
MRF420
17,00
2 N 2948
11.05
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17.00
MRF421
31 .28
2N2949
13.19
2N5913
2.75
MRF422A
35.19
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r.32
2N5916
30 60
MRF427
14 65
2N3375
14.55
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650
MRF428
39.10
2N3553
1.32
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21.25
MRF433
10.25
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1319
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1955
MRF449A
10,75
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935
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8.80
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12.20
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15.65
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17,10
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1.87
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8.80
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13,60
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2.85
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10.25
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17.60
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14.65
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10,75
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21,25
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1 1 25
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0.85
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9.35
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12.75
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265
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11.90
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1,70
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12.70
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3.85
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13 70
MRF492
19.55
2N4127
17.85
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17.60
MRF502
0.90
2N4427
1.10
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5,10
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5.95
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1003
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34 20
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42.50
MRF511
910
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2N6304
1 35
MRF515
1.70
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11.73
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15,30
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1,70
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855
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1 75
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1275
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10,75
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0 85
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270
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1 70
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MRF961
2.55
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^Sea List ol Advertisers on page 130
73 Magazine • April, 1984 39
Calvin B. McCarthy
98 W/ndsof Street
Thunder Bay. OrrtBrio
Canada P7B 1 T7
Emulate an EPROM Elephant
The portable RAM-faker never forgets.
Well, hardly ever. . .
Members of the 2716
family of erasable,
programmable, readonly
nnemories [EPROMsJ are ex-
tolled as the hobbyist's
friends because of their ease
of programming, either with
a simple manual program-
mer or by microcomputer
control However, in the lit-
erature also appears a re-
curring theme of inconve-
nience. For example, you
could spend four or five
hours toggling in data with a
manual programmer only to
make a mistake in bit
16,383. What is the fix? Erase
al 1 1 6,3&4 bits of the E PROM
and begin again Totally un-
acceptable! Even repeating
20 minutes of data input
with a hexadecimal key-
board is too much!
Or maybe instead you
eventually want a program
The EPROM Emulator mounted on the KUobaud Klassroom
SBC-2 computer Here, you see three extra DIP sockets
under the HM 6116 instead of the described two because I
have mounted the RAM on a carrier so that repeated inser-
tions will not hurt the RAM pins, I then can use the memory
without the Emulator circuit most of the time.
40 73 Magazine • April, 1984
in an EPROM but you want
to try the program first
before it is burned for
posterity. The 'EPROM
Emulator/' a RAM that
pretends it is an EPROM,
can help you.
The HMSlie static RAM
is almost pinout-compatible
with the 2716 EPROM.
Where the HM 6116 puts the
WE on pin 21, the 2716 has
Vcc pulling pin 21 high All
other pins are identical This
first suggests that empty
EPROM sockets could be
filled with 2K bytes of RAM
to extend a smalt comput-
er's memory. From here the
CMOS construction makes
the idea of battery backup
of RAM data practical Then
the next logical step is to
build a small package con-
taining RAM with battery
backup which can be pro-
grammed at full computer
speed, data modified al will,
but which can be removed
from its socket without los-
ing its data, placed in
another socket in the same
or any other computer wired
for 2716 EPROMs, and used
as an E PROM Once the pro-
gram is debugged and run-
ning satisfactorily in the
Emulator, it can easily be
copied into a 2716 for a per-
manent record.
A few simple modifica-
tions are made to the basic
RAM circuit to make it emu-
late the EPROM, The Vcc
must be applied through
steering diodes so that the
memory will see only one
supply source at a time-
Output enable (pin 20) is
made continually low by at-
Parts List
1 Switch, DPDT, Radio Shack 27S626 ($2.69)
2 Diodes, 1N914, Radio Shack 276-1620 (50 for S2.99)
1 Resistor. 100k Ohms. V4 Watt (5 for $.49)
2 24-pin DIP sockets, Radio Shack 276-1969 ($1.69 each)
1 HM 6116 CMOS static RAM ($16.50 Quest; $14.95 James)
2 Batteries, 1 V2 volt
^
DATA flETEIiriO'W MODE
CS f i
EfiROM £4iULArM
wm
ft »i^^
2V^
CSiVoft'OtV
F/g. t, low Vcc data-retention waveform.
taching it directly to pin 12
and disconnecting it from
computer pin 20. The low
Vcc data-retention mode
needs the chip select held at
y/cc to retain the data. This
is achieved with a put I -up
resistor connected to mem-
ory pin 24 and a switch to
disconnect the CS from ex-
ternal circuitrv when in the
data-retention mode To
enable the computer to
write to memory, pin 21 is
disconnected from the com-
puter and brought out to a
clip lead so that pin 21 can
be connected to the com-
puter WE tine instead
of being forced to Vcc in the
2716 socket. When used as a
2716, the WE line is
attached to Vcc so that ac-
cidental and catastrophic
wntes do not occur
These connections can be
made using a small PC
board to hold the com-
ponents and using wire-wrap
wire to make connections I
use masking tape as a PC
board etch resist and cut
away the tape where copper
is to be removed. This is
quite satisfactorv for simple
circuits such as this. The
board then is epoxied be-
tween the pins of the bot-
tom DIP socket and makes a
secure foundation for the
rest of the circuit. The com-
ponents are attached to the
copper side of the board fac-
ing up. Some miniaturiza-
tion enthusiast could even
find a way to store watch
batteries in the case to make
a one-box unit although f
am using an external battery
pack.
To use the Emulator, I in-
sert it into a 2716 EPROM
socket with the switch set to
battery supply. (?t must
never be inserted into the
computer with the com-
t^Sve Uif of Adveftii9r& on pag^ 130
puter supply off if the switch
is in the computer-supply
position. The result would
be a quickly-discharged bat-
tery.) The computer is then
turned on and the Emulator
switched to computer
power It can then be used
either as RAM or ROM
depending on the WE con-
nection.
Construction
The EPROM Emulator is
built on two 24-pin DIP
sockets and a small PC
board. This serves as the
support for the HM 6116
RAM package.
1) Pin 20 of the bottom
socket is removed.
2) Pin 20 (OE) of the top
socket is connected with a
piece of wire to pin 12, the
common pin.
3) Pin 18 (CS) of the top
socket is bent in so that no
contact is made with the
bottom socket. It is con-
nected through a resistor to
pin 24 of the top socket and
through half of the DPST
switch to pin 18 of the bot-
tom socket.
4) Pin 21 of the bottom
socket is removed.
5) Pin 21 of the top socket is
connected to the computer
WE line with a flexible wire
and clip.
6) Pin 24 of the top socket is
bent in and made to contact
the PC board land to which
the diode cathodes are con-
nected.
7) Pin 24 of the bottom
socket is connected to the
anode of diode D1 to pro-
vide computer Vcc.
8) The second half of the
DPST switch is connected
across diode D1.
With the switches closed,
the computer Vcc powers
the memory and allows the
computer to select the
?4a
■1
I
I
I
I
*
J J
HMGIIt
CMOS RAM
12
l«T
1
BATT
:^ £BV*aAT-<5V
m
J^*.
tea
IIT
-<>- *E
Wm ARRANGEMEMT
lOT
PQ BDARO TOP VIEW
. L t__L I 1 I L_2 LJ I— L_
JT"*^ J
BiTT
IflT
5*B
+- I"?
mn
04 24T
t«d
A7 C
Afi C
A5 C
A4 C
Ai a
l/Oi c
GNQ(
i
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7
»
M
It
£4
II
17
14
14
HU6II6
I Vcc
13 WE
"not
I t/oa
3 1^07
I t/06
H/04
flOi> VIEW}
1 I I d I I 1 I I r I I
PIN ?4
fig. 2. The Emulator schematic. PC board is not to scale. Let-
ters after pin numbers are B for bottom socket, T for top
socket
RAM for either a write or
read With the switch open,
the battery backup can
power the memory and
forces CS to be at Vcc back-
up, putting the chip into its
low Vcc dataretention
mode, ■
coaxial R. F.
antenna switches
*99i
::^:
, J,'- .'.■■-■ \-
*594
#S95
^:177
Heavy Duty switch for true
1 Kw POWER • 2 Kw P.EP.
Single Pol#, 3 Pos^ion,
Desk Of wall mount
All unused positions grounded
* 593 - UHFconnectors/ $27.25 '
# 5% - BNC connectofs/ $3^,50 '
2 Pole, 2 RDsltion. byposses
lineors. reflectcHTieters, antenna
tuners, etc.
#594 - UHF connectors / $34,25 "
SJngte Rote, 5 Posftba all unused
positions o^ounded.
#595 - UHf connectors / $32,00 '
#597- BNC con nectofs/ $46.50*
' Shipping and handlir>g tor any
item add S2 each.
AIX OUR NraOUCIS MADE IN L^A
BARKEIt m WILLIAMSON
OuatJly Connmun*cation Products $\Pto& 1932
Al your DstTibutofs wrtte Of call
10 Conai Smel fristol PA 19C»7
(215) 786-5581
73 Magazine • April, 1984 41
lohn M. franke WA4WDL
1310 Boiihg A ven ue
Norfofk VA I35QS
Crystal Microwave
Easedropping'' on this part of the spectrum is up to you.
Here's a simple way to start.
Interest in the microwave
spectrum has increased
rapidly since the introduc-
tion of the "Cunnplexer"
by Microwave Associates,
Many amateurs, though,
have expressed interest in
finding a more economical
way to get started What I
hope to accomplish with
this article is to show how
to get involved in micro-
waves with a minimum in-
vestment of time and
money.
The microwave spectrum
is populated with myriads
of signals, ranging from
telephone relays to televi-
sion-studio links to radar to
satellite signals. How can
we detect and monitor
these signals? The simplest
way is with a crystal receiv-
er. Don't scoff. I know of
several production micro-
wave systems that use crys-
tal detectors or crystal vid-
eo receivers as they are
called. The common police
radar detector is a special
type of crystal video re-
ceiver
A crystal receiver can be
broken down into four
basic parts: an antenna, a
tuned circuit the detector,
and an amplifier [see Fig. 1),
The most common tuned
circuit is not really a tuned
circuit but a high-pass filter,
a waveguide. In this mode,
the antenna and tuned cir-
cuft can be combined. If
the detector is mounted in
the waveguide, then the on-
ly external component is
the amplifier
Rectangular waveguide
AWTENftiA
will pass all frequencies
above a cutoff frequency
(f J, The cutoff frequency is
determined by the internal
width dimension of the
waveguide. The cutoff fre-
quency occurs when the in-
ternal width is exactly one-
half wavelength. A simple
formula for calculating this
is f^ =15/b, where b = inter-
nal width in centimeters and
f^=^ cutoff frequency in
GHz. For example, the most
common waveguide for the
3-cm amateur band (10 GHz)
has an internal width of 0.9
inches or 2.29 cm. Hence,
fc^6.55GHz,
If the frequency is raised
such that the width is now
one wavelength, the guide
can support another mode.
This occurs at f = 2f^. So, the
maximum stable frequency
range is from f^. to 2i^. Well,
if you consider skin losses
and other factors, the prac-
tical frequency range is
O^o)
TUNtD ClACVIT
PTTECTOB
JUtFLiriER
front view of S-band unit stiowing diode placement
42 73 Magazine • April, 1984
Fig, 1, Basic elements of a crystal video receiver.
from 1 .25 f^ to 1 .9 f^. For the
previous example, the prac-
tical or useful frequency
range is 819 GHz to 12.44
GHz. This h in good agree-
ment with the published
range of 8,2 GHz to 12.4
GHz. Fig. 2 is a graph of the
upper and lower practical
frequency range of rectan-
gular waveguides having in-
ternal widths from 2 cm to
18 cm.
The graph is not meant
just to enable you to deter-
mine the frequency range of
a piece of surplus wave-
guide. It will also enable you
to decide how wide to make
a piece to use. Yes, you can
make your own waveguide
and do it without a machine
shop. Waveguide can be
made from flashing copper,
brass shim stock, or, my fa-
vorite, printed circuit board.
To illustrate, i made a crys-
tal video receiver to monitor
several radars located near
my home.
There are three S-band
search radars within 20
miles of my home. The term
S-band refers roughly to any
frequency between 1,5 GHz
and 5 GHz. Table 1 is a list-
ing of these informal desig-
nations. Table 2 is a listing of
some microwave frequency
ranges of interest. The local
search radars are grouped
from 2.7 GHz to 2.9 GHz.
Fig. 2. Upper and lower fre-
quencies shown tor rectan-
gular waveguides.
Hence, from Fig. 2, the
waveguide should have an
internal width between 6.9
cm and 9 5 cm. I chose 8 cm
as a compromise. The inter-
nal height should be one
half or less than the internal
width* The guide height de-
termines the impedance and
power-handling capability
of the guide. The useful fre-
quency range of the 8-cm
guide is approximately 2,4
GHz to 3.6 GHz. This range
just happens to include the
amateur 240{>MH2 and
3300-MH2 bands. Higher fr^
quencies can travel or prop-
agate down the guide, but
the mode structure would
be uncertain. I mention this
because the guide will pass
X-band signals and you
should not be surprised to
hear them.
For a crystal receiver, 1
Band Designation
Freq. Range (GH^
P
^- .4
L
.4- 1.5
8
1.5- 5.0
C
4.0- 6.5
X
5.0-12.0
K
12.0-36.0
Q
36.0-45.0
V
45.0-60.0
Table 1. Microwave band designations.
Sourca/Emltter
Freq, Range (GHz)
ILS Glides ope
.3286- .3354
TACAN^DME
.96-1.215
Radar Beacons (IFF)
103, 1.09
Air Route Radar
1.3-1,35
Airpofl Radar
2.7-2.9
Aircraft Doppler Radar
8.8
Precision Approach Radar
9.0-9.2
Marin© Radar
9.3-9.5
Detector/ampt liter with X-band tread and nearby S and
K-band heads.
prefer to make the guide 1
to 2 widths long. For the ex-
ample, the guide is 9.5 cm or
1.125 widths long. This
length was chosen on the
basis of available pieces of
circuit board. Since the re-
ceiver will not be used for a
specrfic frequency but rath-
er for a band, I mounted the
BNC connector and de-
tector one-half guidewidth
from the shorted end.
Construction is simple.
The circuit board material is
easily sawed or sheared to
size. The BNC mounting
holes and the opposing
diode hole are drilled next.
The guide is taped together
and the seams are soldered
with a 10O/150-W iron After
assembly, the diode is placed
inside and soldered No by-
pass capacitor is used. I find
that normal construction
techniques are adequate to
biock the microwave energy
and pass only the modula-
tion Surplus mixers have a
very efficient bypass scheme
and function well as crys-
tal receivers. I use an
X-band mixer to monitor
small marine radars in the
harbor.
The weak detected signal
is boosted by the amplifier
shown in Fig. 3 An LM301 is
used instead of the more
common 741 because of the
lower noise output of the
LM301. The output of the
amplifier is further boosted
by Radio Shack's "Mini Am-
plifier-Speaker/' The low
current drain of the ampli-
fier makes it inviting to ob-
tain its power from the mini
amplifier, but problems with
Table 2 Selected emitter frequencies.
Internal view of preamplifier showing circuit card and bat-
tery^
73 Magazine • April, 1984 43
DCTECTO" U«ft
ALL HF BANDS !
^%
A^^^ :
^v^
TTie SUNWf DIPOLE Antenna
A brcaadband, low SWR drpole that reaify works in apart-
ments, small yards, attics, anywhere a small antenna is a
must, indoors or out you can work ANY HF BAND, in-
cluding W MHz, No gimmicks or addons, fmagine
80M in as Irttie as 24 ft J Complete kit and instructions,
plus 50 ft of coax. Easy to set up and adjust More
infbfmatjon available -just call or write.
Blacksburg Group
Box 242 Suite 500
Blacksburg, Vrrgin/a 24060
703/95 1 -9030
S67.95 postpaid (in USA.)
Money Back Guarantee
Virginia residents -^^
add 4% sales tax
to -=-W(DtMiAl
OUTPUT TO
AUOIO
AMPLIFIEI^
Fig. 3. Schematic of a 50 X audio preampUfm.
motorboating forced me to
use an independent batteiy.
The compact assembly ts
quite portable and accoirh
panies me on short outings.
Waveguides are not the
only usable fomn of crystal
receivers. For narrowband
signals, a separate antenna,
tuned circuit or cavity, and
detector might be better.
Preamplifiers, if available,
greatly enhance the overall
sensitivity.
Try something simple and
build one of these. This
might be the easiest micro-
wave construction article
yet Let me know Vi^hat you
build and how it worked,
and please remember to en-
close an SASElH
Introducing The SRT-3000
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Send For
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DGMIeLEC TROmCS, INC.
787 BRIAR LANE, BELOIT, WISCONSIN 53511 (608) 362-0410
44 73 Magazine • Aprtl. 1984
m
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RTTY CW ASCII
COMPUTER INTERFACE
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• MORE FEATURES
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73 Magazine • April, 1984 45
THE
!*•
0 TOUCH TONE*
pp-1
& PP-IK
PP-2
& PP-2K
An uttra high quality encoder for aboolute
reliability and function. Positive touch key action
with non-maHunction gold contacts, totally
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hardware. CaH or write for free cstalog, dealer's tlst and irtf ormatlon gukie.
PP-1 $55/PP*1 K, S.P.ST. Ad). Relay S62. P-3, 12 or 16 Key^for cystom
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M Series ^Detached frame for Irreg. install. Circuits available-request P-S into
AT*T
Mail
Order
^ipocgommunications
Emphasis is an Ouaffty 5 Reliabifity
% P.O Box 3435
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(213)852-1515 _,j..
NICAD MEMORY ERASE -WHAT??
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« LEQ status inciicators
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Specify VoKaga of Battery Padt{»| v^rth order*
One program modyla included - optior^l
modules $2.25 each.
$89.00 plus $4.00 Shipping
(PA Residents edd 6% ^testax)
Now Availabla-A cornmercli] version of the GMi
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COWTROL PRODUCTS UN LIMITED, INC.
P.O. Box 10, Downingtown, PA 19335
215-383-6395 ^25
J
AUSTIN.
When only
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t
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Taking the leading role in custom artfanna
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VWhatevei your antenna r»eeds, the winner
is Austin,
Call or wnte for product informal ion.
Dealer inquirteih invElpd.^
AUSTIN
CUSTOM
ANTENNA
P.O. Bo* 3S7
Sandown. NH 03873
(&03) 987-2926
m
VL-
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OWN A
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^wf'
:^\'
is CW rmporlant to you? If so,
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Write; or see your dealer for full
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46 73 Magazine • April, 1984
WE SHIP WORLDWtOE ^
lorru.
El
roRL
Your one source for all
Equipmerit!
For the best buys in town call:
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Los Pmcios Mas Bajos en Nueva
York . - .
KITTY SAYS: WE AREN0W0PEN70AYSAWEEK,
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Come to Barry *s for the best buys in town.
For Orders Oaly Please Call: 800-221-2683
ICOM<
We give you the best in ham and
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Jan KB2RV, Kitty WA2BAP,
Made K2C0N.
j
IC-R7iA, tC-751,IC-720A*IC-745JC'27A, IC-37A
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In Stock
Complete Butternut Antenna
Inventory In Stock!
ROBOT 45(X>BO0C'1 200C
Color Mod Kits
Long- rang* Wii^«(fis5
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73 Magazine * April, 1984 47
Mi^
Take a Trip to Europe
These tips from the world's top SWL make it possible.
Roger N. Fetmson
25 Orchard Lane
New Canaan Crim40
Want to visit a ski resort
in Switzerland? Lis-
ten to a concert in Vienna or
the Scots Guard's Band on
parade in London? Or go be-
hind the Iron Curtain to hear
the latest word from the
Kremlin?
You can experience alt of
these and much more by
tuning to the European
shortwave broadcasters.
With more than thirty sta-
tions daily sending out
broadcasts in English, you
have a wide variety of pro-
grams to choose from. And
most are heard easily on
even the most modest re-
ceivers here in North
America.
The major ity of these sta-
tions are stateowned and/or
operated and afl but one
are noncommercial. Some—
particularly those located in
Eastern Europe — can fill
your ears with propaganda,
but even some of these
broadcasters can offer good
programs to listen to.
Others, like the BBC from
London, Radio Netherlands^
and the Swiss Broadcasting
Corporation, produce a mul-
titude of excellent programs
every week with practically
no poli treat undertones.
The programs you bear from West Germany emanate from
this brand-new Broadcasting Center of Deutsche Welle in
Cologne,
48 73 Magazine * April, 1984
so many stations
and programs to choose
from, you should easily be
able to discover some of
particular interest to you.
Are you interested in pro-
grams giving the latest DX
news? There are some good
ones coming out of Europe
every week, The best is
probably from Radio Neth-
erlands, where every Thurs-
day night they broadcast the
popular Media Network,
The producer, Jonathan
Marks, talks with a network
of correspondents in various
parts of the world, examin-
ing developments in the
electronic media on both
the technical and the pro-
gramming side. In addition
to reporting changes in
broadcasting frequencies by
stations all over the world,
Media Network does an ex-
cellent job of keeping listen-
ers informed about new re-
ceivers, antennas, and other
equipment for the short-
wave enthusiast Hear this
on 9 590 or 6.165 MHz at
0230 GMT and 9715 and
6.165 MHz at 0530 GMT
Fridays.
Another excellent DX pro-
gram comes from Switzer-
land—The Shortwave Mer-
rY-Go-Round. This features
the "two Bobs," Bob Thom-
ann and Bob Zannotti. This
team answers letters with
technical questions, reports
on new developments in an-
tennas and receivers, and
carries on lively discussions
about the state of the art.
This program is on twice
each month — on the 2nd
and 4th Saturdays. Hear it at
1315 CMT on 21370 or
25 780 MHz
Radio Sweden Interna-
tional brings you another
fine DX program, Sweden
Calling DXers. This is on
every Tuesday and Wednes-
day and gives you a whole
list of new or changing fre-
quencies for stations all
over the world. It is one of
the best for keeping your
"where to tune to" list up to
date. Hear it Tuesdays at
1415 GMT on 21.61 5 MHz or
at 2315 GMT on 9.695 and
11.705 MHz, and on
Wednesdays at 0245 CMT
on 9.695 and 11.705 MHz.
Radio Sofia from Bulgaria
is the one broadcaster from
behind the Iron Curtain that
is worthwhile listening to for
its DX program. It is particu-
larly good for radio ama-
teurs, giving club news from
around the world and hold-
ing contests. You can hear it
on Mondays at 0045 GMT
on 9 700 MHz.
There are some nine or
ten other DX programs com-
ing out of Europe, but at this
writing, the ones mentioned
above are by far the best.
Belgium has a nice little pro-
gram on Mondays at {)045
CMT on 1 1 .695 or 9,870, and
Austria has an excellent pro-
gram on Sunday mornings at
1230 CMT on 21 .615 MHz
The Spanish Foreign Ra-
dio from Madrid broadcasts
a number of frequency
changes and other DX mat-
ters on Mondays at 0050 on
11.880. Reception is usually
excellent here in North
America. And Radio Prague
from Czechoslovakia has a
DX show that features news
and information for radio
amateurs. It is very elemen-
tary, however, and most lis-
teners won't gain much
knowledge from its usual
fare. The program is on Fri-
days at 0135 GMT, on 5.930
or 9.630 MHz,
World and local news are
popular with experienced
European shortwave broad-
cast listeners. Almost every
station broadcasts news,
usually at the start of their
ADDRESSES OF EUROPEAN SW BROADCASTERS FOR USE
IF YOU WAKT QSL CARDS OR PROGRAM INFORMATION.
Albania
Great Britain
Poland
Radio Tirana
BBC (British Broadcasting
Radio Polonia
Ruga Ismail Qemal)
Corporation)
Komitet do Spraw Radia 1
Tirana
Box 76, Bush House
Telewlzjl
Austria
London WC2B 4PH
ul Woronicza 17, 00-950
1. ■. I
■
Austrian Radio
Gre#c«
Warszawa
!
Short-Wave Service
Voice of Greece
Portugal
A-1136
PO Box 19
E)cternal Relations
Vienna
Aghia Paraskevi, Attlkis
Av, Engl Duarte Pacheco, 5
Belgium
Athens
1000 Usboa
Romania
BRT
Hungary
Radio Bucharest
PO Box 26
Radio Budapest
PO Box 1-111
(I
!
6-100
Brody Sandor 5*7
Bucuresti
!,
Brussels
H-1800
Bulgaria
Budapest
Spain
Radio Naclonal De Espana, SA
Radio Sofia
Italy
Apartado 150,039
BuigarJan Dragan Cankov 4
Radiotelevlslone Itallana
Madrid 24
1421 Sofia 21
Viale Maszini 14
Sweden
.^K L k 1 "
00195 Rome
Radio Sweden International
Czeclioslovakia
Radio Prague
12099 Vinohradska 12
Luxembourg
Radio Luxembourg
Villa Louvigny
S-105 10
Stockholm
Praha 2
Switzerlend
r 1 '□1 m &
Pare Municipal
Swiss Radio International
Finland
Matta
Giacomeltistrasse 1
Radio Finiand
Xandir Malta
CH 3000
PO Box 528
PO Box 2
Bern 15
Helsinki 10
Valletta
U.S.S.R.
Radio Moscow
Franc©
Radio France Internationale
PO Box 9516
Monaco
TWR Monaco
PO Box 141
Pyatnitskaja ylltza 25 ,
Moscow
Paris 16
Monte Carlo
Radio Kiev
Radio Center
Germany (West)
Netherlands
Kiev
Deutsche Welle
Radio Netherlands
Ukraine
Postfach 100444
PO Box 222
Vatican
D-5000
1200 JG
Vatican Radio
Koln 1
Hiiversum
Vatican City
Federal Republic of Germany
Norway
Rome
Germany (East)
Radio Norway
Yugoslavia
Radio Berlin International
Postboks 6701
External Broadcasting
160 Berlin
SL Olavs PI.
2 Hildendarskaa
German Democratic Republic
Oslo
Beograd
programs, Some attempt to
cover the world while others
tend to stay strictly with
news of their own countries
or sections of Europe.
The leader in news pro-
grams, by a wide margin, is
the British Broadcasting
Corporation (BBC), They
broadcast more than 250
news programs a day from
their London headquarters.
News is fed to their editors
from BBC correspondents
located all over the world,
and from their world-fa-
mous Monitoring Service
which provides round4he-
clock reports on what for-
eign broadcasters are saying
over the air. This service is
so popular that the BBC
sells it to subscribers— other
foreign broadcasters, gov-
ernments, news agencies,
etc.
You can hear world news
in English from the BBC 16
times a day. It is broadcast
on the hour except for the
GMT hours of 0100, 1000,
1 200, 1 400, 1 500, 1 900, 21 00,
and 2200. If you are interest-
ed in local Great Britain
news, listen daily at 0009,
0309, 1109, and 1809 GMT,
and, on weekends, also at
0709 CMT.
The BBC has many other
news-related and special-
news programs such as Brit-
ish Press Review, Financial
News. etc. A BBC buff could
spend 24 hours a day listen-
ing to their programs, many
of them about current
affairs.
The other European sta-
tions that broadcast world
news are West Germany, Ra-
dio Netherlands, Swiss Ra-
dio, Spanish Foreign Radio,
Radio Portugal, Belgium,
Austria, and a whole slew of
Iron Curtain broadcasters.
Few people would bother to
tune to these stations for
73 Magazine • April, 1984 4&
These modem broadcasting fadlities of Radio Netherlands at Hilversum, Holland, bring you
some of the best EngHsh-language programs from Europe.
their world news alone as,
for the most part, they are
not in the same league as
the BBC. There are, howev-
er, occasions when it does
pay to tune to one of these
countries. Those would be
when particular news events
take place in that country or
area: earthquakes, revolu-
tions, invasions, big fires,
etc. This is when shortwave
listening really comes into
its own. You can get the
story firsthand and often
before the international wire
services get it to your local
AM radio or TV newscasters.
Some European short-
wave stations skip world
news entirely and stick to re-
porting localized news. The
Scandinavian broadcasters
are good examples. Rather
than try to compete with the
BBC for world news report-
ing. Radio Sweden broad-
casts news only about that
country. The Norwegians
and Finns do likewise. (The
Danes do not broadcast any
English language programs,
so I have no idea how they
report the newsj
You can, of course, get lo-
cal news from the stations
that also broadcast world
news, but often, as is the
case with the BBC, it comes
in separate and distinct pro-
§0 73 Magazifte • April, ig&4
grams such as the daily
''News About Britain" and
the weekly ''Letter from
London" programs.
Listeners to Europe gener-
ally either concentrate on a
few select stations or on cer-
tain types of programs that
appear on a number of dif-
ferent stations. It all de-
pends on the listener's back-
ground or interests. If family
ties are to a certain country
or if travel or being sta-
tioned there during time in
the service generates inter-
est, these may be reasons for
listening. Other listeners
stumble onto certain sta-
tions as they tune around
the frequencies and find
that certain programs grow
on them.
Most of the European sta-
tions try to broadcast to the
US in so-called "prime
time " This is the period be-
tween 0000 GMT and 0430
GMT. This is to catch the
maximum number of listen-
ers in their evening hours.
Many stations will have two
broadcasts of the same pro-
gram, one at the earlier hour
to catch East Coast listeners
and the other at the later
time to pick up the West
Coast,
There are exceptions, like
Radio Finland, which directs
its broadcasts to North
America only in the morn-
ings. And some of the ''pow-
erhouses" like Radio Mos-
cow and the BBC can be
heard at almost any time,
A recent survey among
shortwave listeners indicat-
ed their favorite broadcast-
ers. The question simply
asked, "What is your favor-
ite shortwave broadcast sta-
tion?" The results, in order
of popularity, were as fol*
lows for European stations:
1)BBC
2) Radio Netherlands
3) Swiss Radio
4) Deutsche Welle
(W. Germany)
5) Spanish Radio
6) Austrian Radio
7) Radio Moscow
8) Radio Finland
9) Vatican Radio
1 0) Radio Sweden
11} Radio France
International
Your choice may be dif-
ferent. If you haven't lis-
tened to European broad-
casters lately, here in alpha-
betical order are brief out-
lines of what you can expect
to hear from each. See table
for best frequencies and
times of broadcasts,
m ALBANIA (Radio Tirana)
—Unless you have some
special interest in this coun-
try, this station is not likely
to become one of your fa-
vorites- Mostly political
discussions.
• AUSTRIA (Austrian Radio)
— One of the better stations
to listen to. You can hear it
every night with news fol-
lowed by a feature program.
Additionally, Mondays are
for answers to listeners' let-
ters, Tuesdays are for sports,
Fridays have music, and
Sundays feature tourist at-
tractions. This station is
presently upgrading its
transmitting equipment and
should be easier to receive
in the months ahead.
mBELCIUM (BRT)-Has
the usual news programs
first and then various
features, many dealing with
the European Common
Market which is head-
quartered in Brussels. You
can hear their DX program
on Mondays at 0100 GMT.
m BULGARIA (Radio Sofia)
— Their best program is their
DX news on Mondays at
0045 GMT The rest is pretty
much "party line'' discus-
stons of politics.
m CZECHOSLOVAKIA (Ra-
dio Prague)— Many listeners
feel that this is the best of
the Iron Curtain broadcast-
ers. While it has its share of
political discussions, it also
has a number of interesting
shows that are free from
that taint
m FINLAND (Radio Finland)
— This is one you catch in
the morning hours, and re-
ception is usually good.
They start with news about
Scandinavia called The
Northern Report and then
switch over to various fea-
ture programs, including
pop music.
• FRANCE (Radio France In-
ternational]—You can hear
this one only in the early af-
ternoon hours, and then you
are listening to their broad-
cast to Africa — the only pro-
gram they offer in the En-
glish language. Much of
their programming is devot-
ed to listeners' interests in
Africa, such as Third World
countries. Rumors persist
that RFI will increase Erv
glish programming, but so
far this is all they offer.
'•£ GERMANY (Radio Ber-
lin International}— A typical
"Iron Curtain" country
broadcaster Lots of news,
all with political implica-
tions.
• W. GERMANY (Deutsche
Welle}^ Excellent news
broadcasts and interesting
current-events discussions.
If you like music, listen on
Saturday evenings. Want to
learn German? They have a
language course on Sun-
days.
m GREAT BRITAIN (BBC)^
Besides news and current
events, this station offers a
whole slew of other pro-
grams including both jazz
and concert music, short
stories, and dramas. One of
their most popular programs
originates here in the US
where Alistair Cooke tapes
his Lettef from America.
There is something for ev-
eryone during the 24 hours
of broadcasting by this
station,
• GREECE (Voice of Greece)
— Probably will be of in-
terest only to those with spe-
cial ties to the country or
area. Can be interesting
when one of the frequent
quarrels with Turkey comes
up or Cyprus erupts.
m HUNGARY (Radio Buda-
pest)^ Sometimes, but rK>t
often, you can hear an inter-
esting program. I would
rank it about in the middle
as far as Iron Curtain SW
broadcasters go,
• /MLyrR/4/j-lfyouarea
lover of music, this is the sta-
tion for you. They have op-
era, Italian folk music, and
"pops/' Also, programs on
other aspects of Italian cul-
ture and life. One of the bet-
ter European stations,
m LUXEMBOURG (RTL)~
This is a rare one, a commer-
cial station that you can
hear from Europe. It beams
its programs to London, and
you can hear commercials
like those on a US AM or FM
station. The programs are all
"mod'' music.
m MALTA (Xandif Matta)-
This little station is heard
only once a week, on Satur*
days, and at an impossible
hour for most of us here in
North America (0700-0800
GMT). Not much to recom-
mend, but if you can't
sleep some Friday night
give it a try.
m MONACO (TWR Monte
Car/oJ— Another one with
very late hours for North
American listeners This is a
religious station and the pro-
grams are a(l in that mode*
• NETHERLANDS (Radio
Netherlands)— Many fine
programs to hear on this
popular European station.
On Sundays, host Tom
Meyer has the Happy Sta-
tion show. Mondays feature
life in Holland. Tuesdays is
Shortwave Feedback which
answers listeners' letters. On
Wednesdays listen to Dutch
Spot on a magazine-format
program about events in
Holland. Thursday is
devoted to that very popu-
lar DX program, Media Net-
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73 Magazine • April, 1984 53
work. Friday features Opin-
ion and discusses some of
the views of the Dutch press.
Saturday is a light program
with talk and music; it is
pleasant listening all the
way.
• NORWAY [Radio Nor-
way}—Jhh is one you have
to catch on Sundays since
that is the only time they
broadcast. Some good pro-
grams for people interested
in traveling there some day
and also interested in good
music,
m POLAND (Radio Potonia)
—Not the best of reception
for most of its programs. But
then the programs aren't
anything to write home
about, anyway.
• PORTUGAL (Radio Portu-
ga /J— Their first program
isn't on until 0300 which
makes it pretty late for East
Coast listeners. While their
programs are not particular-
ly earth-shattering, it is a
pleasant station to listen to
and most programs are non-
political
• ROMANIA (Radio Bucha-
rest}—Has some interesting
programs. DX Mailbag is on
Wednesdays, and other DX
programs are on Mondays
and Fridays. Tuesdays they
have a very interesting Tour-
ist News program that
makes you want to visit the
country. Interested in stamp
collecting? Tune in on Sun-
days for a special program
on this hobby.
• SPAIN (Spanish Foreign
RadioJ— Another one of the
top European broadcasters
providing good listening on
most nights. Reception is
consistently good, too. Their
DX program is on Mondays
at 0050 GMT.
• SWEDEN (Radio Sweden)
— Another good one from
Europe. Aside from their DX
program, already men-
tioned, they have a very fine
program on the weekend
called Saturday fronn
Stockholm,
• SWITZERLAND (SRH-
One of the most popular of
all from Europe. While their
weekday programs, primari-
ly news and background, are
good, their weekend pro-
grams are superior On the
second and fourth Satur-
days, listen to their popular
DX programs— among the
best on the air. On Sundays
they have a new program
called Balance Sheet This is
about Swiss business. Don't
think, however, that it is dry
statistical reporting. Instead,
it is a very lively description
of Swiss industry. Recently,
for example, they had a very
interesting program on the
Swiss chocolate industry.
Another one brought us up
to date on clocks and
watches,
• USSR (Radio Moscow and
Radio Kiev}— Many people
listen to Radio Moscow just
to hear their viewpoint on
wodd affairs, US diplomatic
steps, etc. One of their most
popular programs is called
Listeners' Forum and you
can hear this on Sundays at
0010, Right after this comes
Russian by Radio, if you
have any interest in learning
to speak their language. An-
other good program is
Round about the USSR,
heard on Tuesdays and Sat-
urdays at 0210 and 0510,
Radio Kiev is preferred by
many people over Radio
Moscow. Weekdays provide
the usual news followed by
feature programs— most po-
litical. They have a DX pro-
gram on Wednesdays which
is pretty good, but perhaps
their best program is on Sun-
days when you can hear Mu-
sic horn the Ukraine.
• VATICAN (Vatican Radio)
—You can hear it every eve-
ning, even though it is on for
only 16 minutes. Programs
express Vatican opinions on
current events and other
matters.
• YtJCOSMVM (Radio Yu-
goslavia)—Slnctly news.
and all handpicked for polit-
ical implications.
So there you have it.
There is a wonderful choice
of programs from Europe in
English just waiting for you
to tune in. Most are easily
heard and offer you enter-
tainment, education and/or
enlightenment. With your
shortwave receiver, you can
travel to Europe every
day ■
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47000 4 (Jig, 5 5.BS l.M
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Syttatnt eawc till
l4Btoul0u4t fti HI' ^Jtl-
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■litCUlDe SHIPPING CHARGES
tlOO fJnt^HO -4*00
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I^
Hf Eqtupmem Rffylar SALE
IC-740* 9 band 200w PEPicvr w/micS 1099.00 349"
*FREE PS*740 Internal Power Supply &
S50 Factory Rebate until gone!
1*5*740 IfTternal power suppl^..,.. 159.00 149**
•EX'24i Mariner unit ....^ 20.00
* * i ± w w
39.00
50.00
59.50
4?. 50
96 50
96 50
159.00 144'*
39-00
39.50
19.50
89«
*EX-242 FMumt......
*EX-243 Electronic heyer unit
*fL45 boo Hz CW filter (1st fF)
•FL'54 270 Hz CW filter (1st IF)....
•PL 52 A 500 Hz CW filter {2nd IF)
•FL53A 250 Hz CW (liter (2nd if)
•rL44A SSB filter (2nd IF)
Sli-5 8 Pin electrel desfc microptione
HM-lO Scanning mobile mtcrophone
liB-12 Mobile mount....
*Opfions ^ho ior tC-745 tisfe<i befovv
IC-730 8 band 200w PEP Kcvr w/m!C$S29.00 599"
Fi-3Q SSB filter (passband tuning) 59.50
FL-44A SSB filter (2nd IF).. 159.00 144'^
F^45 500 Hz CW tJlter 59.50
EM95 Marlterunit......... 39.00
EX-202 LDA interface: 730/2KL/AH-1 27.50
ESE^ZOa 150 Hz CW audio fiUer 39 OO
EX-ZQS Transverter switching unit 29.00
SII-5 Spinelectretriesfcmicfophone 39 00
HIi'lO Scanning mobile inicroplione 39 50
MB-S MotHle mount 19.50
IC-720A 9-t»nd xcvr/.l-3D MHzrcvr $ 1349 00 B95«*
FL'32 500 Hz CW filter 59.50
FL-34 5.2 kHz AM filler 49.50
SW'5 8 pinelectretdeskmicropfione 39.00
M6'5 I^Dbile mount ,,,. 19 50
IC-745 9'bsnEl xcvr w/.l-30 Mhi re vr $999.00 899^^
PS-35 Internal powei supply . . 16000144'^
CF5-455lt5 2 8 kHr wide SS8 filler IBA
Hi 12 Hand micropbOil€.. ,.-.-- 39-50
SH-6 Desk microphonf .,.. .,- 39.00
*5ee IC-74Q fol abovf^ fnr ath^r opt torn f*)
IC-751 9band Jtcwf/.l 30MH;fcvr $1399.00
PS-3S internal power supply....... 160.00
FL52A 500 Hz CW filter ... ., 96 50
FL53A ZSOHrCWfiitef..,. ^50
FL-33 AM fitter, 31,50
FL'70 2.8 Kt\i wfde SSB fitter 46.50
HM42 Hand micfopfione *.. 39.50
SM-6 Desk microphone 39.00
RC'IO External treQuency controller 35.00
Cli'$4 H# stabtlity reference ictal 56.00
Options: 720/730, 740/745/751 ReguJar
PS-15 20A externa! power supply..,,, $149 00
EX'144 Adaptor lor CF1/PS15.... 6.50
CF-1 Cooling fan for PS- 15..^.....* 45.00
PS'20 20A switcfimg ps w/ speaker ... 229.00
1229
g9«
SALE
134«
199«
ICOM
Opiion^ - contifiui^d
CC-1 Adapt, cable; HF radio/PS20
CF-l Cooling fan for PS'20
EX-310 Votce syntfi: 745. 751
SP-3 External base station speaker , .,
S pea iter/ Pfi one patcfi - specify radio
BC-lOA Memory back-up ,
EX-2 Relay boi witb marker
AMOO lOOwBbandautoniaticanttwfief
AT' 500 500w9-band automate ant tuner
IIMOO Mar^ual antenna tuner ....
AN'l 5 band mobile antenna w/tuner
PS-30 Systems p/s w/cord, 6-pin plyg
OPC Optional cord, specify 2 or 4'pin
GC-4 World cloc^ . ,
IC-2KI w/ps 160' 15m solid state amp
VHf/UHf baie muf^i- modes
IC-251A* 2m FM/SSe/CWtransceJver
*$50 Factory Rebate
Regular
lO.OQ
45,00
39,50
4950
139.00
8.50
34.00
349,00
44900
24900
289.00
259.95
550
99.95
Regular
1795,00
SALE
129«
314**
259^^
233"
94^^
SAIE
1299
Regulir SALE
$749 00 545»*
until gone!
IC<551D 80 Watt £m tfansceiver......
PS 20 20A switcbmg ps w/speaker
EX- 106 FM option........,...,., .. .
QC-lOA Memory back-up .H........
SM-2 Electret desk micropf^one ....
IC-27iH lOOw 2m FM/SSfi/GW jtcvr
PS-35 Internal power supply
IC-271A 2Sw 2rTJ FM/SSB/CW J(Cvr,„
AG- 20 2m pfeamphfier ,
10^47 lA lOw 43a450 SSB/CW/FM icw
EX-310 Voice synthesi?er ,....
PS-25 Internal power supply ._
EX-310 Voice syntf^esizer
HM-12 Hand microphone
SM-6 Desk micropfione
VHF/VHF mobile mukl-modes
IC'290H 25w2FnSSB/FMxcvr,nPmic
IC 4S0A lOw 430-440 SSB/FM/GWxcvr
VHf/UHF/}J GHz FM
IC-22U lOw 2m FM non-digital tm
fX'199 Remote frequency selector
IC'25A 25«.2m.|rnieds.up'dnTTPmic
IC*25H as above, but 45w.. (Speciatl)
BU-IH Memory backup ...........
$699 00
229.00
125.00
8.50
390D
TBA
16000
699.00
5695
799 00
3995
99,00
39-00
39.50
39,00
54900
64900
Regular
299.00
35.00
35900
3B900
3830
5391.
199«
112**
144«
629*^
71f*»
89»5
489*^
579«
SALE
249»^
319»*
339«
Umiied Offer! Get a FREE BU-IH Memory
back-up with your purchase of an IC-25H.
IC-27A 25w 2m mobile transceiver....
EX- 388 Voice synthesizer ...........
IC-45A lOw 440 FM itcvr. HP mic ....
AG-1 15 db 440 Mhz preamplifier
EX- 270 CTCSS encoder .*,•.,...
BU-1 Memory back-up,.,. .*.*..
RP 3010 lOw 440 Mb? FM repeater
IC^ 120 Iw L2 GHi FM transceiver ....
RP-1210 lOw 1.2 GHz FM repeater....
Cabinet for RP 1210 or RP-3010
6fn portable
IC^SOS 3/lOw 6m port. SS8/CW xcvr
BP-iO Internal Nicad battery pack
8P 15 ACcfiarger
EX'24S FM unit
LC-10 Leather case..,
SP-4 Remote speaker.
!-#*■>■*'■
■ r-h >«■*■■■*■ *''«■ VWVPi^Vi*^^'
369,00 329«
TBA
399 00 359«
89.00 79'^
39.00
38 50
999 00 899*^
499.00 449"
1199.00
249.00
Regular SALE
$449 00 399^*
79.50
12 50
49 50
34 95
24 95
Harrd-hetd Transceivers
Dffuit moilels Regular SALE
IC'02A lor 2 meters $ 319 00 ISr^
IC-02AT w/DTMF 349.00 314"
IC44A for 440 MHz TBA
IC 04AT w/DTMF TBA
Standard models
IC-2A for 2 meters $
IC'2AT iritliTTP ......
IC-3A for 220 MHz.,.
tC-3AT wtfiTTP......
tC-4A tor 440 MHz, „
IC-4AT with TTP .,...,
Regular SALE
239 50 214"
269 50 219'^
269.95 234*^
299J5 239»*
269.95 234»*
299J5 23r*
At I t-.s) }ries for Deluxe modeh Regular
BP-7 800mah/!3 2V Nicad Pak ■ use BP-35 67.50
BP-fi 80Omati/3 4V Nicad Pak - use BP-35... 62.50
BC'35 Drop m desk charger ^ all batteries.... 69 00
BC 160 Wall cfiarger BP7/BPa....*i,** lOOQ
Acce%'>ones (or both modek Regular
BC 25U Entra wall cftarger for BP2. ......... I 10 00
BC'30 Drop m Cftarger - BP2/eP3/6P4/BP5 69 00
BP-2 425mafi/7.2V Hm6 Pak - use BC30 39 50
BP-3 Extfa Sid 250 m8h/8.4V Nicad Pak..-, 29 50
BP-4 Alkalme battery case .,.,.... 12.50
BP 5 425mah/108V Nicad Pak ^ use 8C3D 4950
CP'l Cigarette lighter plug/cord ■ BP3.. 9 50
OC 1 DC operation pak for standard models 1750
LC-2AT Leather case tor standard models 34 95
HM9 Speaker microphone ,..^*-,... 34.50"
HSIO/HSIOSB Boom mic headset/iwitchboat 39 00
HP-IOSA Vojt unit for HSIQ. -.«.«- TBA
iUl 2m2.3win/10ivoutsmplifter.....SAiE 79,95
liL-25 2m 23m in 20w out amplifier .,., SALE 179.95
3A n»# Optional TT Pad - 2A/3A/4A 39 50
SS-32li Commspec 32tone encoder. _*,...... 2995
Marine modef
M-12 12 ch Marine Handheld SPECIAL 269 95
Shortwave recetverit-
R-71A 100 Khz- 30 Mhz digital receiver
R-70 100 Khi-30 Mhz digital receiver
EX-257 FM unit..*
IC-7072 Transceive interface, 720A
FL-44A SSB filter (2nd IF)
FL'63 250 Hz CW fitter (ist If]
SP-3 Eiternal speaker . — ,.
EX- 299 (CK-70) i2v DC option
MB- 12 Mot>iie mount.
■*****V9'¥ *^*!
Regylar SALE
$799.00 699^^
749.00 599*^
38.00
112.50
159.00 144"
48.30
4950
9.95
19.50
MastefCofd
V
HOURS: Mon. thru Fri. 9-5:30; Sat 9-3
Milwaukee WATS lioe 1-800-558 0411 answered
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73 Magazine • Aprils 1984 55
Wit Ham C, Clomnger. jr. K30F
4409 duckthom Court
RocJtvi7/e MD 10853
Four BandS; One Whip
Quadruple your mobile operating pleasure,
please, but don't blame us.
Did you ever want to
change bands while
operating mobile but didn't
want to stop in the rain to
change resonators? Now
you can change bands with-
out a thought about your
mobile antenna. How about
a bandwidth as much as
one megahertz [see Fig. 8X
with swr of no more than
1.5:1? You can build this mo-
bile antenna for a fraction of
the cost oi a commercial
mobile antenna The materi-
als are readily available and
are not costly,
A Look at the Basics
The six-foot mast is con-
structed from Va" copper
water pipe. The overall
length is not critical, but sig-
nal reception will suffer at
anything much less than a
five-foot mast length. If you
own a Hustler or similar
mast you already have the
first part of your new multi-
band mobile antenna.
Mu It i banding is obtained
by the use of multiple LC cir-
cuits—one for each band
desired. A typical mobile an-
tenna has resonators (LC cir-
cuits) with an adjustable
whip. The adjustable whip is
actually the C of the reso-
nant LC circuit. You might
i^%
Fig. 1. Top-ioaded mobile
antenna.
P'^'^^l-x
A
Fig, 2. Resonator positioned
at 90* (vertica! polarization
retained).
think of such a mobile an-
tenna as shown in Fig, 1,
Adjusting the whip
changes the C and raises or
lowers the resonant frequen-
cy, A tip: In general* a
greater amount of capaci-
tance wHI result in a greater
bandwidth. These mobile
antennas are "top-ioaded,"
i.e., the LC circuit is at the
top of the antenna and, for
all practical purposes, the
only part ot the antenna that
radiates is that portion be-
low the resonator That is
the reason you should make
the mast as long as is practi-
cal. Since the whip is ba-
sically C, why stick it up in
the air where it will just give
your antenna increased abil-
ity to reach all those nearby
objects — trees, carports.
etc.? You can actually place
a typical resonator at a 90**
angle to the mast and prob-
ably notice no difference
in performance, although
tuning may thange slightly.
This couid present an eye
ha^a^d or you might even
spear a bird Let's look at
this change as shown in
Fig. 2.
Fig. J. Multihand antenna
setup.
73 Magazine * Apr! M 984
LOCK
iOLT HEAD WAS PUT IN
DRILL 4ND NEADTURNEE
WITH ^IIIDER 50 IT WOi/
FIT 4NSIDt NIPPLE —
1/2* COPnn PtPC
COPPER COUPLER
DRILL S/S* HQL€
m iilPPLE
BRASS NIPPLE
3 /A i. 2* eR4S^ OR
STAINLESS KUJ
-3/a I 24 $TWNl€SS bolt
1— P^«" BRASS
BRAZLNG ROD
Fig. 4. MasNo-fnabile attachment.
Capacitance does not
have to come in the form of
a whip. Two wires in the
shape of a V form a capaci
tor proportional to the area
within the V. The V is easy to
adjust (change C). In fact. I
used exactly this method in
my initial experiments It
doesn't work too well for
aclual mobile use because
the V is not rigid during vehi-
cle motion and the vibration
of the V causes fairly wide
and constant changes in
resonance.
Now that I had decided
to place the LC in a horf-
zontal position, I also decid-
ed to multiband the antenna
by using more than one LC
circuit. The configuration
now becomes that shown in
Fig. 3.
I am currently using four
LC circuits on my mobile an-
tenna, but you can use one,
two, three, four, or more. I
haven't tried five yet, but
that's one of the next steps.
The LC for the lowest fre-
quency should be at the top
of the mast with the next
higher frequency below that
and so on.
Mechanical Construction
The idea for the mast
came from an article in 73
JWagaz/ne (February, 1979, p,
42). I used non-ferrous ma-
terials to avoid any rust
problems. The mast itself is
a six4oot length of Vi " cop-
per water pipe The details
of the fitting which attaches
the mast to your mobile
mount are shown in Fig. 4, I
used a brass end cap
through which 1 drilled a
3/8" hole for the 3/8" x 24
stainless steel bolt. The
brass end cap is consider-
ably stronger than the cop-
per end cap used in the 73
Magazine article However,
it does require that the head
of the bolt be reduced to al-
low it to tit in the inner di-
ameter of the brass end cap.
I simply chucked the 3/8" x
24 bolt in my 3/8" electric
drill and used my shop
grinder on the bolt head
while letting the drill rotate
the bolt for a nice even
"nitK hining," The end cap is
assembled with a bronze or
stainless steel lock washer
and a brass or stainless steel
nut. If you have any difficul-
ty in finding a stainless steel
bolt, you might try a local
boat or marine dealer
The end cap is assembled
to the mast with an ordinary
copper sleeve and soldered
with a propane torch Do a
good job here because there
is a lot of force at the base
of the mast, I use a rigid
mount and do not tie or guy
my antenna. Now we close
the end of the mast to keep
out water I soldered a flat
piece of copper to the end
of the mast.
LC Construction
I used some spare trap
covers from my Cushcraft
HF antenna for the support-
ing structure for the induc-
tor and capacitor These
trap covers are thin and do
not offer much wind resis-
tance as the wind flows
through them. They are prob-
ably a phenolic material,
-STAINLESS
MOSI CLAMP
HOt^LOW COtL R>RW
THAP COVE RSI I i/Z' OlA.
1—1/2 OF PIPE COUPLER
(5AW£Q m HALFi
fig, 5. Detaih of mounting bracket
which is very suitable for an
inductor form.
The part which kept me
from building the antenna
for over a year (I love to pro-
crastinate) was deciding
how to fasten the LC circuits
to the mast, Fig, 5 and l^hoto
A show the construction de-
tails of the mounting
bracket. I cut a copper
sleeve in half longitudinally
and brazed copper tabs to
the half coupling. Copper
for the tabs was obtained by
splitting a short length of
copper pipe, opening it up,
and flattening it with a ham-
mer. (I had four feet of cop-
per pipe left after cutting six
feet off for the mast, so the
material was handy) The
tabs were bent 90*^ and a
piece of V4"' copper tubing
was brazed between the 90*^
tabs so that the inductor
form would not be crushed
when attaching it to the
bracket Brass nuts, 6" x 32,
were soldered to the top and
bottom of the bracket You
might want to use one long
screw to attach the whole
assembly and not be both-
ered with the brass nuts.
A word about brazing the
copper parts; The high heat
anneals the copper. It
becomes soft and I have had
one bracket fail due to the
vibration. It lasted over
eight months and over
20,000 miles The TS-meter
LC was made with #12 cop-
per wire and was quite
heavy, You might solder or
silver solder your bracket or
find an even better method
of attaching the LC assem-
bly to the mast.
I have made inductors us-
ing #12. #18, and #20 wire
The #12 wire is quite heavy
for a 20-meter LC circuit and
probably impractical for a
40-meter LC circuit. The #20
wire gets warm when using a
steady carrier but has
caused no problem with
SSB If you run a kilowatt
mobile, the #12 wire should
do just fine.
The capacitance was add-
ed by using 1/16' brass weld-
ing rods I chose the modi-
fied rhombic because it did
Photo A. Disassembled mounting bracket-
73 Magazine • April, 1984 57
24 m
Photo B. Cnd<iip meter position.
not have a sharp end as
would a V and should avoid
some static problems. I had
hoped to adjust the C by
bending the rhombic (in-
creasing or decreasing its
area], 1 found that vibration
and vehicle motion caused
erratic changes in reso-
nance, so I added the adjust-
ment spanner to the center
of the rhombic. This allows
easy adjustment of the reso*
nant frequency.
Detefmining LC Values
If you like to experiment
by trial and error, you'll fove
this. I spent many hours re-
moving one turn at time,
varying capacitance, and
trying to find where the LC
was resonant. I would be
looking for a 15-meter or
20-meter resonance and
would alt of a sudden find
myself in the IOmeter
range. This is not the best
58 73 Magazine « April, 1964
way to start, although you
will probably have to use
this cut and try method for
the 10-meter LC
I found that I could use
my Heathkit ® grip-dip oscil-
lator (gdo) to find the res-
onant frequency of the LC.
The secret is to put a pickup
coil at the base of the anten-
na and insert the gdo coil in-
side the coil (see Photo B).
The Heathkit gdo is a handy
piece of equipment but
hardly a laboratory -grade in-
strument I first found a res-
onant frequency of 14.2
MHz. so 1 connected the an-
tenna to the transmitter and
checked swr It was not reso-
nant anywhere in the 20-
meter band! Suspecting
something funny, I used the
same pickup coil and con-
nected it to my frequency
counter and, since a gdo is
actually a signal generator,
the counter showed that the
lOm
'fi*J*
4Qn
Om
WATER PIPE Oft
OTHER MAST
&-e FEET NldH
LOOP FOR
CfilO Dip
«niD DlPUtTEft
U^€ AS CLOSE MS
POSSIiLe TO
ANTEI^HA Ft CD MMIfT
fig. 6. Grid-dip meter posi-
tioning.
indicated 14 2 MHz was ac-
tually 13.8 MHz. It was con-
venient that the error was on
the low side because I had
to remove only one turn to
raise the frequency of the
LC circuit (or decrease ca-
pacitance, which would not
be as desirable as it would
reduce bandwidth). You
don't need a frequency
counter to check your gdo.
Just use a short antenna on
your HF rig and sweep the
frequency with the gdo until
CW«CfTAH»CE-
TTST SCTl^P
in
2.0
iM
l.Z
\\]
40m
f.O.
d.i J L ii.i..A.I J
72 723 7 3
FREQUCMCY
FREOUEMCY
1.4
f Z
p w
mm
1 C L 1 I ..J— 14
211 tl.A >-£l.4B
IM tl-4
2&0
2910
r^/
Fig 8. Typica! swr and band-
width, fa J 40m swr iapprOK.
25 kHz @ 15 or /ess swr| lb]
20m swr (approx. 1 50 kHz @
1,5 or less swr/. /cj 15m swr
tappro)i, 300 kHz @ 1.5 or
less swrl id] 10m swr lap-
proK. tJ MHz @ L5 or less
swr).
you hear its signal on your
HF receiverThfS is an easy
method to calibrate or com-
pensate your gdo.
CHANGE SPP^AD T«
ADJUST RESdhtAI^CE
FIK*L *L' AMD 'W' TO SUIT
6 - 32
BRAS 5 nvTs
4-SZ BWASS S^CftEW
CUT NtAO OfF
OfllLL l/l*' HOLE
Af40 SOLDER fiRASS ROO
FOB SPACER-
Fig. 7. Resonance adiustment assembly Inductance— ar\y
diameter, any wire size (to suit power level), number of turns
to suit frequency.
1*19/32"*Dtoitietar Inductor Forms
Band # Turns
L X W
#12Wrre
20m 32
ID" 2<t/6^^
15m 16
11-1/4" 1-3/8"
10m 11
9-1/4" M/8"
#20 Wire
40m 55
14-1/4" 1-1/2"
20m 22-1/2
Addftionai data using #20 wire
92 turns = 5.5 MHz
83 turns ^ 5.9 MHz
67 turns = 6.6 MHz
62 turns - 6.8 MHz
59 turns = 7,1 MHz
55 turns = 7.25 MHz
38.5 turns = 11 MHz
13-1/4" 1-1/2^'
Note: L and W are the length and width of the rhombic (C).
Table T. Inductor winding data.
As previously mentioned,
I used a V configuration
tPhoto C) for the initial ca-
pacitance as it couid be eas-
ily changed to adjust the res-
onant frequency. Work on
one LC circuit at a time
Table 1 gives some dimen-
sions which are intended to
be a guide and give you a
place from which to start.
Differences in form diame-
ter, wire size, and materials
will require that you find
your own right combination.
Weatherproof
Your LC assembly must
be weatherproof. I learned
from experience what a lit-
tle rain will do to the reso-
nant frequency I guess I just
figured out why commercial
antennas use trap covers!
My first attempt at weath-
erproof ing was by dipping
the LC assembly in polyure-
thane varnish. This lowers
the resonant frequency
about 500 kHz and is heavy.
I have used epoxy resin, the
type used to make fiberglass
repairs, with good results.
There is no appreciable fre-
quency change; it is tough,
medium in weight, easy to
apply (pipe cleaners make
excellent disposable paint
brushes), and cures in about
30 minutes.
My preferred method is to
put some silicone seal at the
end of the LC assembly and
enclose the inductor in heat-
shrink tubing (obtained sur-
plus or at a hamfest, in case
you don't know how much a
0fSa9 U^l of Aii¥0f1istfs Oil A>9t S30
piece of new Z^-diameter
heat-shrink tubing costs!).
Assembly and Adiustment
When you have com-
pleted the desired number
of LC assemblies, they are
attached using stainless
steel worm-type hose
clamps. The LC assemblies
should be positioned fore
and aft very carefully to
minimize wind resistance,
They should be carefully
aligned or you may have
one big rudder and a very
*'mobile" antenna. I have
used care in alignment and
have watched the antenna
at highway speeds — it does
not whip around. Proper po-
sitioning may actually cre-
ate a stabilizing effect.
Fig. 6 shows the position-
ing I am presently using.
There is some interaction
between the LC assemblies,
and "four in a row" caused
some swr problems, par-
ticularly on 15 meters.
Adjust each LC circuit to
the frequency you desire-
Start with the highest fre-
quency first (10 meters) and
adjust each until you have
adjusted the LC circuit of
your lowest band.
More Thoughts
You donl have to make a
multiband antenna. You
may make an LC assembly
for only one band. It might
be used on a four-foot mast
when height is a considera-
tion such as on a motor
Photo C Resonator test assembly.
home or tractor-trailer You
might combine two or more
LC circuits on a single induc-
tor form. You might use a
circle instead of a rhombic
for capacitance. You might
leave the circle or rhombic
open at the end and adjust
the spread with a movable
insulator. You might use a
ferrite core to reduce the
size of the inductor You
might use the LC assemblies
for a temporary or space*
restricted base antenna
(with proper radials or
counterpoise). You might
build a small beam or rotat-
ing shortened dipole, You
might
Thanks to Bo Owen
K4QKH, senior staff engi-
neer at Teledyne Avionics in
Charlottesville, Virginia,
for the fundamentals and
basic ideas.
CU on 10 ov 15 or
20 or 40 or. . ■
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73 Magazine • April, 1984 S9
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IS
The Conlog Solution
Whafs the key to winning contests? Put an Atari
and this program at the helm of your station and find out
Charles D. Moore NSATD
PSC#2Box3Q00
EimGndorf AK 99504
This program enables a
radio operator to keep a
more accurate contest !og.
It fits quite handily into a
16K Atari 400/800, yet will
save and compare up to 750
call signs. The information
can be saved or recalled
to from disk or cassette and
output to the screen or a
printer A callsign can be
compared with up to 750
others in slightly less than
one second.
I never really intended to
write this program. But the
rest of you hackers out there
wilt recognize the symp-
toms. At the request of a
friend, I tried to translate a
short program written in
Microsoft Basic to Atari
Basic. But, after adding a lit-
tle bit here and a ''Hey, this
would be nice" there, it grew
into the present monster.
Well, maybe not a monster,
but certainly more than I
intended.
As usual, the hardest part
of translating to Atari Basic
is the string handling. In
62 73 Magazine • April, 1S84
Atari Basic, strings cannot
be directly dimensioned in-
to arrays. Instead, DIM A$
(1000) sets aside 1000 spaces
for one long string. While in
some ways not being able to
dimension a string array is
more ditficult, having a
single long string is in other
ways very fast and control-
lable. I made a single string
9000 characters long and
sort of partitioned it off into
segments of 12 characters
each (12 * 750= 9000) By
taking, for example, the
seventh callsign and multi-
plying it by 12, the 84th
through 95th characters in
A$ can be accessed by
A$(84,95). In other words, for
N = 7, A$(N*12,NM2 + 11),
The subroutine to search
CALLS, the string that holds
all the caltsigns, is a
machine-language subrou-
tine loaded into page six
by line 445. The subroutine
searches the length of
CALLS for a match to the
current entry using X =
USR(XX). This is accom-
plished in lines 160 through
170. The variable GOOD is
used to count the number
of good contacts. I used
GRAPHICS MODE 2 be-
cause the letters were bigger
and I could throw in a little
color without using up room
needed for string space by
taking advantage of the ad-
ditional colors available in
MODE 2 with inverse tetters,
lowercase letters, and in-
verse lowercase letters The
sound is simple, but 1 found
that anything more elabo-
rate tended to slow down
the program a great deaL If
a callsign is good (it has not
been encountered before), a
high tone is sounded. A bad
callsign wilt result in a low
tone. This way the operator
cannot tell if an entry is
good without looking at the
screen.
Operating Coniog
First of all, type in the pro-
gram. It helps, believe me.
Hopefully, upon RUN, the
screen will display the num-
ber of stations worked, zero
at th[s point. In the text win-
dow, two lines of informa*
tion are displayed in inverse
video. The first merely re-
minds you that no more
than 12 characters may be
made on each entry; the pro-
gram will ignore any extra.
The second line gives the
functions. To access these
instead of a callsign, type:
SCREEN for output to the
screen, PRINTER for an out-
put to the printer, or MENU
for saving or loading in-
formation. The output to the
screen is pretty quick but
may be stopped and restart-
ed by CNTL 1 at any time.
The output to the printer is
one callsign per line because
I was running out of program
space. Now you are ready to
enter a callsign. Upon typing
one in and RETURN, the pro-
gram will print the callsign in
the box and then search the
string CALLS for a duplica-
tion A message, GOOD or
WORKED, will be printed
below the callsign in the box.
If at any time you desire
to save or load information,
use MENU and follow the
questions you will be asked.
First, you will be asked if
you are using disk or cas-
sette Just press the first let-
ter, D or C If you are using
disk, you will be asked for a
file name. Follow the gener-
al guidelines for a file name
given in the Atari Basic ref-
erence manual. Next, a
message SAVE LOAD QUIT
will be printed. When you
press S or L, you will be
asked to ready the device
you are using. Q will return
to the callsign entry portion.
Now, if you operate on a
band and want to change
10
15
20
25
30
J5
40
45
SO
93
&0
65
70
15
eo
65
90
95
100
105
UO
lis
120
125
130
135
140
145
150
155
160
165
170
175
lao
185
190
1^5
200
205
210
215
220
225
230
235
240
245
250
255
260
265
270
275
280
295
290
295
300
305
310
315
320
325
330
335
340
3^5
350
355
360
365
370
375
300
3S5
390
395
400
405
410
415
420
425
430
435
440
445
450
455
460
4&5
470
475
4ao
405
490
495
500
505
510
7 -SCBEEM
70
PRINTER ME^ftJ*
65
TUEH 5O0
REK CONTEST L0G^ChAries Moore M5ATP
CRAPHiCS 2
GOSUB 445:GOat^0
MM CAU4t^lO}.e*(12},TEST|U2KHOLI^(12KFILEfa4KO$(14)
FOB ^^1 TO 40jCALU<Z,ZJ = * •aHBCT 2
TftAP 655CIjOSE tl
POSITION 0,2s? «6l*infJUt callsigr*i"i
POSITION 1,5!? ifej-********* *•••••••" I
POSITION l,6i? »6|"* »*j
POSITION 1,7*? #6»"* *"|
POSITION l.Sr? t6rw**»*******«»***»»«;
PnS IT ION Q , 0 1 ? *e ^ '* WOSKE D= " r GOOD
T *• "i
IF GDOD^D THEN CALL$=" '^ iC$=""
IF GO0D=75a THFJ^ 255
7 **maximum entryi 12 char*
INPUT C^slF LEN(C$)*0 THEM
HOLPiri rLEWt C$ j )=»C|U ,LEN(C| ) J
POSlTIQif 3,6t? •^i*
POSITION 3^7t? t^i- •)
7 • -1
POSITION 3p6
7 «6iCJs
IF C$^-SCREK<r THEN 335
IF C$=-?CElrfU- THEN 255
IF C$="PEINTEH* THEN 415
IF OOOD=0 THEN GOSUB 250= GOTO
eCSUB ISSsCOTO 65
CKLEN^CU + Ut" -
LY»LEIsr{ CALL$ J i UCsLEN(C$ ) t POKE 207 ,LX-1
h-ly-ij:-i+3
A3U5K{1664,ADB(CALL$U) )^ADR(C|3 |B}
IF A^O THEN 190
f*05tTlOK 3,7i7 #6> ♦'WbrKeD'* j J S"230iGOTO 240
ir H01J>f (1,12 ^-CAU.$ ( LEN( CALLI ) -I I , t£N{ CALL| J >
POSITION 3^,7*? #6j"GociD! J-}
£-50
? " -I -ADO TO LIST {Y/NS-i:OPEH •! ,4,0, "K* " tSO«€D 0,122,14,1
GET »l,T!CLOSE •!*? ■ "tSODKB 0*0>0*Q!lF C3IBt(TN'Y* THEH 220
IF CH«${TH*K* THEH B5
GOTO ZOO
es-ll^GOOO*-!
CALL|{ CS, CS^ I 1 ) -HOLDf ( 1 , 1 2 }
FOB Z^l TO 50i50tlKD 0*S#lO, lOi NEXT ZiSOUND 0,0,0,0
fiertiRN
CAU4il-12)=H0LD$U.i2)iGOTO 503
GRAPHICS Os CLOSE *liTRAP 255
GOTO 2m
? "INPUT FILE NAME cxi 'BAND10^"i7
INPUT FILElilF LEM{ FILE* 3=0 THtN 2&5
RETURN
OPEN #l,4,0,*Ki*
7 " DISK Oft CASS- J GET #1,7
IF Z=6S TKEh" GQSUfl 2fe5-D*i 1 ,2 J-»Di "iGOTO 510
IF 2±^6T THEtf D|U i2H"C;* (GOTO 3iO
COIfO 255
7 - -;? - SAVE LOAO QtllT';GET *1,2
IF Z^ai THEN GltAPHlCS 2:GOrO 35
ir ^31 THEN CLOSE tliGOStIB 435iOP^ tlrQrO^MiGOlt) 375
IE Z^ 76 ''then close tlsGOSUB 43SiOP^ #l,4iOj DfiGOTO 400
GOTO 255
If COQB=0 THEN CBAFHICS 2 i GOTO 35
Ca-i5R=0
GRAPHICS OsFOS Z>0 TO G0OO-ltC3»l3*^-H
C=C+liIF C=2 THEJ^ a«=H+liC=OtIF Hi>2 3 THEN R=0
TEST$=CALLJ ( CS t CS+ 11 J s POSITION C* 20+4 , K
? TEST$:NEXT Z
7 CALL? { LEN f CALL} ) - 1 1 , LEN ( CALL$ ) j
FOR Z=l TO lOOOtJ^EXT Z: GRAPHICS 2 1 GOTO 35
IT GOOD^O THE*J 7 * NOTHING TQ SAVE* i FOR Z=l TO lOOOiNEXT ZiGOTO
PRINT #l,GaO0
FOR 2=0 TO GO0D'liCS=i2*2+I
TESTS=CALl4(CS,CS*ll)i? »1 j TEST S i NEXT Z
TESTf=CALL${LEI*{CALU|)'lliLEH(CAU4Hi? ♦IfTEST* iCWJSE tl^mM
GOOl^Os INPUT »1, GOOD; FOR 2^0 TO GOOD iC^l 2*2*1
IHPilT #1 M TESTI 1 CAIXI ( CS » CS+ 1 1 J -TESTf (1,12}
WBCf ZsGSAPHICS IiOCfTQ 35
OPEN #l,S,O,-Pi-|F0ll Z=0 TO COOI>-1 fCS=lZ*Z*l
TEST J= CALL* { CS , CS-*- 1 1 J i ? »1 r TESTI t NEXT Z
? »hCALL|(LEN{ CAIXI) '11 rLEHiGALLin
CLOSE #ltGRAFHICS 2:G0TO 35
35
? « -I? ♦•PREPARE DISK/CASSETTE'*!? i? ♦'I'HESS REtlJiRN*
INFlfT TESTIS RETURN
FOE 1=1664 TO 1 7 55 1 READ A i POKE I, At NEXT 1 1 RETURN
DATA 104. I04r 133,204, 104p 133.203, 104, 133
206,104,133,205,104,141,222,6,104
I41,22I,6,1&9, 1,133,212, 169,0, 133
213, 160, 255r 200, 177, 203, 209, 205
240 , 4D, 24 , 1 &5 , 203 « 1 05 , 1 , 113 * 203
1^5,204,105,0, 133,204,24, 165,212
105,1,133,212,165,213,105.0,133
213,205. 222,6t20S,2I6, 165,212, 205
221,6, 20a. 209,240.7, 152,197, 207, 208
204,240,6,169,0,113,212,133,213,96
POSITION 5,7t? *6i''l*oaicBcl"| jS=230t<3OTO 240
S* 150 1 GOQD=CO00*li POSITION 5,7i? «6? "GcmD* j sCOTO 240
G|(l»LEN(FXLE|}*3>«FILE|(IjLE}l(FIL£^}):Gmtl 310
DATA
DATA
DATA
D*TA
DATA
DATA
DATA
DATA
DATA
Program listing.
bands for a while because
conditions change, you can
dump the information to
disk or cassette and easily
start again later by calling
up prior call signs by file
name. This can lead to a few
t^S9€ Ust i^f Adv^isars on page f30
less headaches and
proved eyesight.
im-
Notes
Unfortunately, there was
very little room left for re-
marks, so they are rather
WHAT IS SELECTIVE CALLING ?
Definitian: Silences your radio until you are
cc^ed
Adi^anfase; Chotter-jree radio monitoring.
SCC'l Selective Call Cantroller Features
TouchTone® decoder
Three programmable
call codes
TouchTone® encoder
16 -button keypad
Auto dialer — ten
16 -digit numbers
LED status indicators
Accessory relay
Mobile mounting
bracket
Ideal for RACES and
radio clubs
■TouchTore * a r«six^«T«d rTademark
of AT&T
For complete information and pricing contact:
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i^l9«
Sparse in the listing If you
are using disk, you of course
have more than IbK, so it
would be easy to expand the
number of entries. When
you save the information, be
sure you have plenty of
room, as 750 entries takes
about 75 sectors on a disk
and a correspondingly great
amount of cassette space.
This program is designed
as a help for contest logging,
but it could be used to check
for duplicate entries for just
about anything. With minor
effort, the string partitions
could be shortened or
lengthened. Likewise, the
graphics could easily be
changed to fit a specific ap-
plication. The substring
search would only need to
be changed so that the new
length of the substring b
used for comparison,
I hope this program will
make all the users of other
than Atari Basic jealous. It
runs quickly and looks nice.
With the small blend of ma-
chine language, the program
makes a nice addition to the
ham's computer librar\^ If
you really mess up and
break the program, you can
restart it by CR.2:COTO 35
and nothing will be lost or
affected. It you have any
comments, questions, or
(hopefully) improvements,
please let me know Til
answer/comment on any-
thing with an SASE. Also, if
you would Itkeacopy of this
program, just send a blank
disk or cassette with a
stamped, self -ad dressed
mailer and $3 00 to PSC
#2 Box 3000, Elmendorf AK
99504.
Credit Department
I learned the technique
used for the substring search
from a very good article by
E. C. Smith in the August,
1982, issue of Compute
magazine. My Basic version
of the same type of search
took about 13 seconds to
compare 750 entries. ■
73 Magazine • April, 1984 63
Spenser Whipple, /f.
c/o73
Ishmod's Journal
What happened in 1963 finally surfaced in 1983,
Was he a fool?
It all started out inno
cently enough. Planning
a DXpedition to an area
that was thought to be in
the control of one of the
Balkan States. But what a
story. I had agreed with Ish-
mod that the story would
not be told until he was
gone. He believed that the
telling of his story would
provide him with a great
deal of money and power
and he wanted nothing but
\
7
^ C
0
i-i
^urm^.
■**'«^
c
>i
Map page from the Ishmod lournai The map is hand-drawn
and centers around the Bay of Bengal and the tiny speck of
land that was to be the DXpedition's destination. Water
damage has obliterated the coordinates of the island and
other critical parts of the puzzle,
64 73 Magazine • April J 984
to be left alone.
It began in early July in
1967, My wife and I had
spent a relaxing holiday on
Capri. On our way back to
Athens she wanted to do
some more shopping, so we
looked for a locker at the
train station to temporarily
store some of our packages.
When I opened it, a crum*
pled paper bag was in it.
Curious as to its contents, f
looked inside. A strangely
familiar sequence of letters
and numbers caught my
eye on the front of an old
leather- bound notebook —
7&ir^ Minder, A/avi ^aJt^Pt/jpoor^^
All eouiprndfi-^ Aas^ hccn checked rW
checked aau^mm U/r UiUi hav^ cn^H^h
iced -for pcrmpS ^O <ia!yB. ^
a p€.ihncif-dtr^n^inGi^sr^
t^rLci^^iismf fo4tnc^ 44^ as ky ^^^
'Mlc^ w/// have TUJ0 c^mfy.
fhc north
I
Another loose page from the journal. These entries were
made the night before tshmod and his friends were ferried
to the island.
what turned out to be what
I would fater call the
Ishmod Journal
Unaware of its historic im-
portance, I tucked the rag-
ged notebook under my
arm, figuring I would take a
quick look at it while my
wife made still another of
her forays into the local
shops. So, when I did look at
the cover again, it dawned
on me why the faded legend
on the cover seemed famil-
iar. It read S7Z2B. That
could well be an amateur-
radio call sign, although I
had no idea to which coun-
try it might have belonged.
Settling under an olive tree,
I began to read. When my
wife came back about 40
minutes later, she thought 1
was crazy from too much
sun. I was babbling about
someone named Ishmod
and that the world had to
know about him. So this is
Ishmod's story, at least as
well as I could put it to-
gether. I say that because
there still are some areas
that can't be accurately put
together.
Though the handwriting
was poor and some of the
pages were damaged from
moisture, I think I figured
out most of it. I do wonder,
though, because most of it
if I interpreted it correctly,
is almost too much to be-
lieve. Hams around the
world have had some won-
derful and disastrous DXpe-
ditions, but this one takes
the cake. And through an in-
credibly intricate string of
events, the story has re-
mained hidden all these
years, A novel could be
based on the travels of the
journal itself.
It seemed that Ishmod
Kaduk S7Z2B, an amateur-
radio operator from the In-
dian state of Sikkim, had
gathered a group of fellow
hams from two neighboring
vitfages to share in his
dream of putting a new pre-
fix on the air. Ishmod had
intended to use a barren
rocky footprint of land
about 70 miles off the coast
of India in the Bay of
Bengal. The exact location
is hard to determine as this
information was on one of
the pages damaged by
water, but it appeared to be
southeast of Chilka Lake,
which is about 200 air miles
from Calcutta, down the
eastern coast of India.
Apparently, Ishmod was
an experienced sailor, hav-
ing grown up in Chatrapur,
a small village near Chilka
Lake and the sea. He had
spent his boyhood there un-
til he went off to the univer-
sity at Delhi. This much was
clear.
One summer after his
next to last exams in what
was to lead him to the
equivalent of an electrical
engineering degree, he had
packed his small sturdy sail-
boat with enough provi-
sions for a week and was
planning a relaxing cruise in
the familiar bay. Three days
out, he saw something
ahead in the water. There
was no land indicated on
any of his charts, but there
it was. Using a sextant, he
noted his position and re-
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• Trigger Bandwidtfi 30 Mtiz
HFI>5
DERRT, N;H. 03O3a
WAMNBU HILL [603 J 434-5 371
sumed his vacation from his
studies.
When he returned to
school in Delhi, he spent
Sonne time in the great li-
braries and government rec-
ord buildings looking for
some reference to the small
island he had found the pre-
vious summer. Having grown
up in that area and sailed
there all his life, he could
not recall any mention of
the land from the sailors he
used to talk with down on
the dock near his village.
Eventually, he did find an
old document at the Indian
Registry of Vessels that
warned ship captains of the
menace of a reported shoal
at about the location he had
seen the rocky island. The
document also noted that
"landing rights thereon" had
been claimed over a hundred
years ago by a Serbo-Croa-
tion prince through some
special diplomatic agree-
ment. Although claimed by
the prince, the landfall had
not become the legal territo-
ry of any Goyntry. Ishmod
could not believe what he
read. The following summer
he planned to have his
DXpedition. And this was the
beginning of the adventure
chronicled in the Ishmod
Journal.
Late in the evening on
June 24, 1963, Ishmod and
four other hams sat around
a small table on the dock
at Chatrapur, double-check-
ing their equipment lists.
They had pooled their mon-
ey and chartered the only
boat large enough to ferry
their equipment and provi-
sions to the rocky island
that was to be home for the
next six days. Little did they
know then that they were
about to make history. They
were to be the first to
observe a phenomenon that
defied the laws of physics
and electromagnetism. The
rocks of the island ex-
hibited the incredible ca-
pacity to alter the infundib-
Continued on page 224
RTTY TO DAY
«
MODERN GUIDE TO AMATEUR RADIOTELETYPE
.:"i-AAls?
RTTYtoiw
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•RTTY TODAY"— the qnly up-tcndAte
handbook on RTTY avaiFabEe, covering all
phases of radto-teletype. Answers many
questions asked about amateur RTTY. Ex-
tensive &eclions fully cover the home
computer for RTTY use^
Authored by Dave lngrarr» K4TWJf a
noted authority on RTTY. Written (n a
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RTTY TODAY is fully Illustrated with
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'RTTY TODAY"— Table of Contents
Chap, 1 The EKCiting World of Amateur
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Chap. 2 Operating Parameters and
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Chap. 3 Straight Talk on Home Com-
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Chap. 4 RTTY Systems for Home Com-
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Chap. S RTTY Converters You Can
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Chap. 7 New Mini-RTTY Systems
Chap. 8 Fascinating RTTY Outside the
Amateur Bards Press— Military
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Chap. 9 Fre^juency List of Commercial
Press Services
Chap. 10 Secrecy and Other Codes
Used \n Radioteletype
Chap. 11 Tables of Abbreviattons Used
in RTTY
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7$ Magazine • April, 1984 65
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HV-BAIN HO-2S 10-20M DUAD ,,,..,. ^^34. OO
HV-E3AtN &A-B& &n 6 ELJTCMT BEAA. .««,.. «90*00
HY-OAIK SDDa tO-&Of1 TRAP DOUBLET. ,*,,« ,07,^00
INNER6PACE 20 AMP PtSHEP SUPPLY. ,,,.**** ,91 ,O0
INNERSPACE 20 AMP METERED POWER SUPPLY, 121 .OO
KENWOOD BT~1 DESK CHARGER FOR TR-'240O. , . 72. 00
SWAN HFM[200 HF MDBl LE SWR/NATTTCTER, . , « . 37. 30
TRAC TE133 ELECTRONIC KEYER 41.93
TRAC TE2e4 MEMORY ELECTRONIC KEYER. .. 4 - -^7,30
2 rETER MG^ILE ANTENNAS
AVANTI API! I. 30 1/2 WAVE "(W BLAGS " . , 29 , 93
CUSHCRAFT AM&-147 MAONET MOUNT. ...,,,.. .27.93
CUSHCRAFT ATS- 147 THUhr MOUNT...,. 27,93
HUSTLER
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2 METER
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C8-144 3/8 WAVE 3. 2DB BAIN. . ..27,93
CK-144 3/B IMVE 3)8 OAIN* , . • « .«9«9S
IFIERS
MJ
MIRABE
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M]
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TOKYO H
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IBH-POl£R H-30V 2 IN 30 OUT 39 . 95
IQH^-POHER MJB2V lO IN BO O^. ... 139.95
tSH-POWER H-lfcOV 10 IN 160 OUT.. 30^. 93
|»4-POwER l4.l*0v2tS 23 i« lAO OUT279,v3
HF/10M/4iM RADIOS
NCB 10/160M.SaB/CW,4 fEM. 3 WAY SCAN. .. .BBS. 00
TENTEC AR0P&Y lOOW. BBB/CW. lO-^Ofl ,^,.510.00
TENTEC CORSAIR SODW-SSB/CW, lO-liOM. . . . .999.00
TENTEC OMNI -A 200Wp B9B/C*lg 10-160rt 7^9. 9$
AZDEN PCS-4B00 IQMIfM MOB. .lOW. 16 MEn^.269.9S
AZOEN PCS-4300 *M^FM HOB. ^ low, 16 NEM, , , 279, 95
Amateur
Communkotiofis
CODAvstlabto
Hours: B:30 a.m. to SM p.m. Monday thru Fridty
9:00 a.m. to 2:00 p.m. Siturday - CST
PrlcBs subject to change without notiea.
^— CWJLFrtANKWCSQZUORJOEKASROO
FOR QUOTES ON OTHER RELATED PRODUCTS
FOeORMUlH
Amateur
Equlpmefit,
Accessories
& Antennas.
ExpCMl Anywhere
2317 Vance Jackson Rd.
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(Toll free nunfiber 800-531*5405)
aOtivougr; t0plirt30meiera Dijftperf orrns ■■ d- ancJ
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lQiBnd& cofninii soan Heighir 26 ttf? Q fn9i»fs, guyv^
not mquiritd in maai utsmiatHsmi
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vwii* tOf our FREE CATALOG'
N
ELECTRONICS
405 E. Market St. Lockhart. TX 76644
66 73 Magazine • April, 1984
COUUD
THE
KEYS TO YOUR FUTURE
Unlock all the potential of your
Commodore 64 and VlC-20* with
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Here's a system-specific magazine written with
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I ^_^^
I
•ELECTOR
300 WATT ANTENNA TUNER HAS SWR/WATTMETER, ANTENNA SWITCH, BALUN-
MATCHES EVERYTHING FROM 1 J to 30 MHz.
MFJ'tftstftst salllnq ttinar pacNs In plantv of niw fBaturei!
• Naw Styling] Brushed aluminum front. Ail metal cabinet.
• Now SWI^/Wattmatarl More accurate. Switch selectable
300/30 watt ranges. Read forward/reflected power.
• Naw Antenna Switchl Front panel mounted. Select 2 coax
lines, direct or through tuner, random wire/balanced line or
tuner bypass for dummy load
• Nowairwound Induttor! Larger more efficient 12 position air-
wound inductor gives lower losses and more watts out. Run up
to 3O0 waTTs RF power output Matches everything from tS to
30 MHz: dipoles. inverted vee, rar^dom wires, verticals, mobile
wtiips. beams, balanced arnJ coax lines^ ByilHn 4:1 balun for
t)alanced tines. !QOOV capacitor spacing. Black. 1tx3x7 inct>es.
Wofks with all solid stale or i\M rigs. Easy to use. anywhere.
MFI VEBSA TUNEB a
•1#
MODEL tkiF4,t4ii3
r
^«l«f •«iO
MFJ-MIO
NEW
FBA TUBES
RTTY/ASCII/CW COMPUTER
INTERFACE mfj-i 224 $99.95
•.•isiS.ffJf.
^mmm
%m^ and receive computflrlzad RTTY/ASCil/
DW with nearly any panonal computer (VIC-20.
Apple, TFtS-eOC, Atari. TI-99. CommcxJore 64.
etc ). Use Kantronics or most other RTTY/CW
software. Copies both mark and space, any shift
Pficiuding 170. 425. 850 Hz) am] any spe^ (5-too
WPM RTTY/CW. 300 baud ASCII). Sharp e pole
active filter for CW and 170 Hz shift. Sends 170,
B50 Hz shift. Nornoai /Reverse switch eliminates
retun^ng. Automatic noise iimiter. Kantroflics
compatible socket plus exclusive general purpose
socket. 8xr/4x6 m. 12-15 VDC or 110 VAC with
adapter. MFJ^1312. SSJ6
RX NOISE
BRIDGE
Maximize
your antenna
parformanca! $59*95 MFJ-202B
Tells whether to shorten or lengthen antenna tor
minimum SWR. Measure resonant frequency,
radiatiof^ resistance and reactan<£.
Mew Featufts: individually calibrated resistance
scale, expanded capacitance range (±150 pf).
Built-in range extender for measuremeols bt*
yond scale readings MOO MHz, Comprehensive
manual. Use 9 V battafy. 2x4x4 \n.
INDOOR TUNED ACTIVE
ANTENNA
''World OrabtHir'' rivals or exceedi riceptlen .
of Duttlde long wirail Unique tuned Active
Antenna minimizes intermod, improves select-
ivity, reduces noise outside tuned band, even
functions as preselector with external antennas.
Covers oi-30 MHz, Telescoping antenna
Tune. Band, Gain,
On-oif bypass controls.
tcixS in.Uses 9V
battery. 9-18 VDC or
no VAC with adapter,
MFJ-13t2, S9.95 5^3.30 HFi^lOEO
CQNVEJITIII
jm
POUCE/FIRE/WEATHER
2 IVI HANDHELD CONVERTER
Turn your tyntheifzed scanning $39,95
2 matar handheld Into a hot Police/ f » mfj
Flre/Weither band scanner! J 1 -31 3
144-148 MHz handiields
receive Police/ Fire on 154-
158 MHz with direct fre-
quency readout, Hear
NOAA maritime coastal
plus more on 160-164 MHz,
Converter mounts between
hand^teld and rubber duclfy.
Feedthru allows simultaneous
scanning of both 2 meters
and Police/Fife bands. No
missed calls. Crystal controlled. Bypass/Oft
switch allows transmitting (up to 5 watts) Use
AAA dattery^ 2V4xl VixlVz in. BNC connectors
MFJ/BENCHERKEYER
COMBO
MFJ-422
#33p30
The Dett ol
lE) CW worlds-
a deluxe MFJ Keyer in a com pacfTon figuration
that fits right on the Bencher iambic padd!e!
MFJ Keyer - small In size, big in features, Curtis
8044 IC, adjustabCe welghl am] tone, front panel
volume and speed controls (8-50 WPM) Built-
in dot-dast! memories. Speaker sidetone, and
pieh button selection of semi-automat+c/tune
or automatic modes Solid state keying Bencher
paddle is fully ad]usiaple, heavy steel base with
non-skid feet. Uses 9 V battery or 110 VAC with
optional adapter, MFJ-1305. $9,95.
VHF SWR/WATTMETER
Lowcott MFj-ei2 $29.95
VHF SWR/
Wattmeterl
Read SWR I - ^ ^1^
(14 to 170 MHz) I ^ 'iiVjl
and forward/ I '- 9^
reflected power
at 2 meters Has 30 and 300 watts scales. Also
read relative field strength. 4x2x3 in.
■,ilalMiH
*«* •««<:■
■fflf
1 KW DUMMY LOAD „, „^
MFJ-250 $34,95
Tune up tail, avtand -^^^Jj^^^mt^
life of final I, reduce ^^^5^5^^^
QRMI Rated IKW CW ^\ ffff M^.m*
or 2KW PEP for 10 min- M
utes, Half rating for 20 I
minutes, continLiOusat ,
200 W CW. 400 W PEP
VSWR under t,2to30
MHz. 1.5 to 300 MHz,
Oil contains no PCS.
50 ohm non-mdu€tive resistor. Safety vent.
Carrying handie. r/zxev* in.
24/12 HOUR CLOCK/ ID TIMER
MFJ-1Q3
Switch 10 1%
hour GMT or
1Z hour format!
Battery backup
maintains time during power outage. ID timer
alerts every 9 minutes after reset. Switchable
seconds readout. Elapsed timer. Just start clock
from zero and note time of event up to 24 hours.
Bright blue ,6" digits. Alarm with snooze
function. Synchronizable with WWV. lock
function prevents mis-setting. Power out. alarm
on indicatcrs. Black. 5x2x3 in 110 VAC. 60 Hz.
DUALTUNABLESSB/CW
^^^^^^ MFJ 752i $89-95
3:53.--
• • o o
Dual fllten give unmatched performance!
The primary filter lets you peak, notch, low
pass or high pass with extra steep skirts.
Auxiliary filter gives 70 db notch. 40 Hz peak.
Both filters tune from 300 to 3000 Hz with
variable bandwidth trom 40 Hz to nearly flat.
Constant output as bandwidth is varied: linear
frequency control. Switchable noise limlter for
impulse noise. Simulated stereo sound for CW
lets ears and mind reject QRM . Inputs for 2 rigs.
Plugs Into phone jack. Two watts (or speaker.
Off bypasses filter, 9-18 VDC or 1 10 VAC witfi
optional adapter. MFJ'1312. $9.95.
ORDER AN¥ PRODUCT FROM MFJ AND TRY IT*NO
OeUGATION IF NOT DEUGHTED, RETURN WITH*
tN 30 PAYS FOfI PROMPT REFUND (LESS SHIPPING)
■ One year uiwandtUmiil guarantee • Made In USA.
• Add $4.00 each shipping/handNng « Cillof wrila
for trie atalog, ovtr 100 products.
MFJ ENTERPRISES, mC, ^^
80X 494, MfttfitippI SUti^ MS 39762
TO OROER OR FOR YOUR NEAREST
DEALER, CALL TOLL FREE
800-647-1800. Call 601 323-5869
in Miss, and outside continental USA
Telex 53-4590 MFJ STKV
66 73 Magaim^ • April, 1984
MFJ RTTY / ASCII / AMTOR / CW
RTTY/ACSII/AMTOR/CW
INTERFACE
CARTRIDGE
FOR
VIC-20/C-64
Moit verittlli RTTY/ HP, ^m^
ASCIl/AMTOR/CW fnlir- #i!*m qr
fm cartrfdgt ivaHabie for ^ RQ "^
V I C * 20 and C ommodof e *#*#
64. Gives you more feamres, more por^irmaiieet
more vafu€ for yoor moriBy man any other iniertace
GsiTJdgfi avaiiaote.
Simfl InterftM eartridgs works for b^th V1C-20 and
Comrnooof e 64 Plugs into user's pod.
ClwoM \rm wttte viHtt^ €l RTTY/ASCff/CW.
ffven AMTOR sotTware. Vou are not married to {me
0n-board sattware package. (J&a MFJ, Kantronics,
AEA plus most other software eartridQe. tape or disk.
850 Hi ind 170 Hz shifts m receive ind transmit.
HBt m»rh snd tpsct mitputi for scope tuning.
Normal/Revene twiteli eliminates retjning.
Tryi dual chinnal mark tnil aiMce ictlvt ffltars and
automatic threshold correction gives good copy when
one tone Is obliterated by QRM or selective fading.
Eiiy, poilttve tuiilng with twin LED Indicators,
Narrow WQ Hi sctive CW filter. Automatic PTT.
Eiar Z2&6 sine generator for AFSK output.
ShJflldad XCVR AFSK/FTT intirTici citsJe provid-
ed Plus or minus GW keyed output. FSK ouT.
Powartd liY campHtar (few mAj^no power adapter
to buy or extra wire to dangle or p4ck iip/radiate RFL
Glaii apQxy fC B . ^ymmimi eficiosure . 472x4^2x1 ".
MFJ INTERFACE plus MFJ
SOFTWARE CARTRIDGE
for VIC^20 or Cpmiiiedort S4.
MFJ-1Z28 PLUS MFJ-tZtSO
or MF4-12S1 for one low price
99 »5
Save $20.00
SOFTWARE CARTRIDGE FOR
VIC-20/ C-64 MFJ-1ZS0/MFM2ST
PowirtuI MFJ «Oftwari $ AQ 95
cartridge for VIC-20 (M FJ- ^^^^
1250. S49.^)aiMl Comnrtodore 64 (MFJ 1251.149.95),
Plugs into expansion port Deveto^ t>y MFJ.
Ftaturei RTTY/ASCif/CW sand and receive, splFt
screen display, type ahead buffer, message ^jorts,
status displiy, automatic CW speed tracking, paraitej
printer comfKitlUIFty plus much more.
SUPER RTTY FILTER
39
95
MFt CC?MFUTtH mTVMPM^ fUt**
^^'^
«* -• #:
SM^.'-A-:!, t-
Super RTTY
filter greatly
Improves copy under
crowded, fading and weak signal conditions. Improves
ittf fiTTY receiving system, B pofe bandpass active
filter for 170 Hz shift {2125/2296 Hz mark/space). 200
or 400 Hr i^nd widths. Automatic no^se tlmiter . Audio
m, speaker out jades. On/off /bypass switch. "ON"
LED. 12 VDC or 110 VAC with optional AC adapter.
MFj^iaiZ. IBM. :^4xl Inch aluminum caUrwt,
GENERAL PURPOSE RTTY/ ASCII/
AMTOR/CW COMPUTER INTERFACE
Lets ymM send and recetve computerizBd RTTY /ASCI I /AMTOR/CW. Cupies
ail shifts and all speeds. Copies on both mark and space. Sharp 8 pole active
filter for 170 Hz shift and CW. Plugs between your rig and VIC-20, Apple,
TRS-80C, Atari, TI-SS, ComnHKlore 64 or most other personal computers.
Uses MFJf Kantronics software and most other RTTY/CW software.
JtK/
•
«
em
neem OrilT«
cm
MFI RTTY CW
COMFUTEP tKTERr ACE
#
m'4-*o*
•
MFJ Software plus MFJ Interfaca for VIC-20/C-64
Software rartridge alone, $4995. Order MFJ'12S0/MFJ-1224. jm0^^^ qe
fof VIC-211, MFJ-1Z51/MFJ-1224 for Commodore 54. ' T VH
IncludDS cable to Intertaeo MFJ-1224 to ViC-20 or C-64. ' ^v
MFJ-1224
99
New MFJ-1224 RnY/ASCIJ/AMTOn/CW Com-
puter tnterface lets you use your personal computer
as a computerized full featured RTTY/ ASCII/
Af^^TOR/CW station for sending and receiving. Plugs
between rig and V1C-20, Apple, TRS-flOC. Atari ,
Th90. Commodore 64 and most ottiers.
Utt MFJ (tse MFJ-1250/12S1 bilow) svttware for
VlC-20. Commodore &4 and Kantronics for Apple.
TRS-aoc, Alan, TI-99 and most other software ftM-
RHY/ASCI [/AMTOR/CW.
Eity. potittM tufklfH) with twin LED Indicators.
CepY iflf tnift (170,4^,850 Mz and ai^ mm shifts)
and any speed (5-100 WPM RHY/CW and up to 300
baud ASCIi).
Copiii on i»tli mfrfc ind tptci, net mark only or
space only, to improve copy under adverse conditions.
Sharp 8 pole 1TQ Hz ihift/CW actt¥i flfter gives
good copy under crowded, tadlrrg and weak signal
conditions. Automatic noise ilmlter suppress static
crashes for tetter copy.
Normil/Revene iwltcli eliminates retunlng. +250
VDC loop output drives RTTV maclilne. Speaker |ack.
Autamitlc tr»cklng copies drifting signal
Exer 2206 line genentor gives phase continuous
AFSK tones. Standard 2125 Hz mark and 2295/2975
Hz space Micropfione line; AFSK out, AFSK ground,
PTT out and PTT ground.
FSK ktylfio output. Plus and minus CW keyiriQ.
CW transmit LED. External CW key jack.
Kimronid tompjtibli todett.
Exclyifvi Qifieni p^jrpott sodnt allows interlac-
ing to nearly any persofiai osmputer with most appro-
priate software. Available TTL lines: RTTY demod
out, CW demod out CW-ID Input, +5 VDC, ground.
All signal lines are buffered and can be inverted
using an Internal DIP switch.
Uta Gallo toftwan wittt Appit, RAK with VIC-20,
Clay Abrams with TflS^SOC. N4EU with TRS*80 Iff,
iV. Some computers with some software may require
some external components.
Mftal ^Mmt. Brushed alum, front. Bxmx6 In.
12-15 VDC or 110 VAC with adapter, MFJ-1312.J9-95.
MFJ-1223. mm, R1-233 fHiptir hr MN-11i4.
MFJ-1226
CW INTERFACE CARTRIDGE
FOR VIC-20/ C-64
High ptrformtnci CW
Intiffica cartridge. Gives
excetient performance
ynder weak. crowcM* notsy
conditions. Works for both VIC-20 and CcMnmodore
64. Plugs Into user's port.
4 poll too Hz bindwl{tt1i ^ettve fitter. 800 Hz
center frequency. 3 pole acUva iowpass post detection
filter. Exclusive automatic tracking comparator.
Plui and mlnui CW keving. Audio In, speaker out
Jacks. Powered by computer.
Includes Basic llttinQ of CW transmit /receive pro-
gram. Available on cassette Upe. MFJ-1Z52 (VIC-20)
or MFJ-1253(C-64}.K95and on software cartridge,
MFJ-1 254 (VIC-20) or MFJ^1 255 (C-64). $19.95,
¥oii an alto use MFJ-1ZSQ (VIC- 0) or MFJ^1251
(C-64). $49.95 each, RnY/ASCII/CW software cart-
ridge. Or use Kantronics. AEA and others.
Aln copy RTTY witti single tone detedioit.
UNIVERSAL SWL RECEIVE
ONLY COMPUTER INTERFACE
FOR RTTY/ ASCII /AMTOR/CW
MFJ-tm
r
Mf J-1E25 plui MFJ-1250
or MFJ-1ZS1 $99 J5.
Ute your
personal computer
and Dommunications
receiver to receive commercial, military and amateur
RTTY/ASCI I /AMTOR/CW traffic.
Plug* between receiver tncf VIC-Z0, Apple, TRS-
80C. Atari, Tl-99, Commodore 64 and most other
personal computers. Requires appropriate software,
Uie MFJ(iee thit ad), Kantronics, AEA and most
other RTTY/ASCII/AMTOR/CW software.
Capiat all tNftt and ilf ipa«^. Twin LED indicators
makes tuning easy, positive. Formal/Reverse switch
eliminates tuning for Inverted RTTY. Speaker out
jack, includes cable to Interface MFJ-1224 to VIC-20
or Commodofe 64 4^1x1 /ix4y« Inches. 12-15 VDC or
110 VAC with optional ^tapter. MFi-1312. 19.95.
Omin AKY PflODUCT FROM MFJ AND TRY IT-NO
OiUGATION. IF NOT DiUQKTED. RETURN WITH-
IN 30 DAYS FOR PRO MFT RE FUND (LESS SHI PPINQ).
• One year unevmtttlwial guarantae • Made in USA.
» Add ROO each shipping /handling • Callerwrtia
far fraa catalog, ovtr 100 preductt.
MFJ ENTEHPBISES, IKC, ^9
Box 494, MIstltslppi State, MS 39762
TO ORDER OR FOR TOUR NEAREST
DEALER, CALL TOa-FREE
BOO 647-ISOO. Call 601-323-58^
In Mfss, ano outsfde continental USA
Tei#)( 53-4590 MFJ STKV
See List of Advert t'sBrs on page 130
73 Magazine • April, 1984 69
f Dale WiTiiams K3PUR
S592 S. Moore Street
Littleton CO 80127
The Terminal Terminal Unit
Build this variable-shih TU.
Its performance will knock you dead.
Following the advent of
the affordable home
computer, increased inter-
est in RTTY operation was
generated in the amateur
communitv. The benefits of
being able to do away with
the noisy printer and use
video displays for received
and transmitted data moved
this mode of operation into
the electronic age Since
computers are not normally
designed to perform RTTY
operations unaided, special-
ized hardware interfaces be-
tween receiver/demodulator
and transmitter, as well as
software to control them,
were required. Aside from
those specialized or dedi-
cated systems for RTTY now
available from manufactur-
ers such as Hat, Robot and
DCM, hardware/software is
commercially available for
the popular Radio Shack
TRS^O/ Apple/* and the
Pet* * * computer systems to
provide this added capabil-
ity to the ham station.
For RTT^ Baudot opera-
tion, the requirements of the
'TRS-80 is a registered tradfr
mark of Tandy Corp.
* *
Apple is a registered trade-
mark of Apple, Inc.
** p
Pet is a registered trademark
of Commodore Business Ma-
chines.
demodulator/terminal unit
(TU) for computer operation
have changed very little
from the days of the Model
15 printer and current loop
driver/relay. The input signal
is still provided by the re-
ceiver audio, filtered and
conditioned by the TU, and
output as either an "on" or
"off level depending upon
the mark or space frequen-
cies. However, while the
output for the Teletype®
prmter was required to be a
20 or 60*milliamp current
driver for the mechanical
system, the computer re-
quires only a plus-five-volt
(1) or zero-volt (0) level.
Over the years, many '1m-
Photo A, Terminal unit fronl-panet lay out
TO 73 Magazine • Aprilj984
proved" TU designs were
produced to overcome the
effects of signal fading, in-
terference, noise, etc. The
variation of mark and space
shift, that is, the separation
between these frequencies,
required different filters to
be incorporated in the TU to
be able to copy the desired
signals Similarly, in order to
copy different speeds, switch-
able-speed filters were re-
quired. Amateurs have al-
most universally standard-
ized on the 170-Hz shift for
better noise immunity and
on 60 words per minute,
since most surplus printers
are equipped for this speed.
With the approval by the
FCC of ASCII operation on
the ham bands, new re-
quirements were necessary
to enable amateur use of
this new mode. Many
surplus ASCII machines are
available, but not too many
amateurs desire to purchase
and maintain two machines
to be able to operate both
Baudot and ASCII. Addition*
ally, ASCII operation is au-
thorized on the HF bands to
28 MHz at speeds of 110 and
300 baud. These speeds are
approximately ^J and 4.6
times faster than 60 words
per minute, respectively,
thus affecting TU filter pa-
rameters for reliable copy.
In originating design re-
quirements for a TU ori-
ented to computer opera-
tion, a number of tradeoffs
must be considered. First,
we must decide whether we
will be satisfied with copy-
ing only amateur 170Hz-
shift signals as opposed to
the older 850-Hz-shift and
commercial RTTY stations,
such as news service at
425-Hz shift. The trade-off
incorporated into the
described design provides
an input bandpass filter to
allow reliable copy of the
1 70-Hz shift and the capabil-
ity to switch this filter out of
the circuit to pass wider
shifts. Differing shifts mean
different mark and/or space
frequencies which lead to
the requirement for multi-
ple filters. This problem is
solved by using active filters
and designing the space fil-
ter with a center frequency
which can be varied by
front-panel control over the
shift range desired. For addi-
tional selectivity on wide-
shift signals, an available re-
ceiver filter may be used to
perform the function of the
switched-out bandpass unit,
Second, we must deter-
mine the amount of sophisti-
cation or ''bells and whis-
tles'' we desire to add. The
incorporation of a limiter
circuit is a basic require-
ment for accommodating
signal fading. However, the
capability of switching out
the limiter or changing its
parameters for AM-type sig-
nals or interference thresh-
olding should also be avail-
able and is included in the
design. Since this TU is also
used to copy CW signals
with a TRS-80, a threshold
control is provided to allow
the level of the desired
signal above interference to
be set with or without the
limiter in the circuit.
Active filters are sensitive
to increases in signal level
over the design amplitude
and distortion in the desired
response will occur if this
parameter is not considered,
Therefore, a single transistor
stage has been included
which adjusts the signal
level when the limiter is
switched out of the circuit
Photo B. Terminal unit rear-panel jack arrangement
and precludes overdriving
the mark and space filter
through the use of clipping
diodes in the base circuit
Fig, 1 shows the circuit per-
formance for varying input-
signal levels with the limiter
switched in and out.
Filter response/width is a
function of signal intelli-
gence bandwidth versus
noise and interference. The-
oretically, a filter of band-
width ''n" should be able to
pass ''2n'' bits of intelli-
gence However this figure
does not take into account
noise, fading, and interfer-
ence. Naturally, we v^ould
like to have the narrowest
filter response which will
cut off all interference on
either side of the desired sig-
nal, but one wide enough to
preclude having to retune
for drifting transmitter oscil-
lators.
The input bandpass filter
used in this design can be
tuned by the circuit-board
trimmers for a bandwidth gf
160 Hz with the values
shown. This is wide enough
to pass 170-Hz-shift mark
and space signals without
any problems at both
60-word-per-minute Baudot
and 110-baud ASCII, How-
ever, at 300 baud, with the
input filter tuned for maxi-
mum amplitude at 2210-Hz
center frequency (f^X the fil-
ter response drops off rather
sharply, decreasing the
mark/space intelligence
bandwidth [as shown in
Fig^D^
In order to provide a good
recovery capability for
300-baud signals, the input
filter is slightly detuned, as
described later, to widen the
3<IB Width. The LM3900 op
amp used for the active fil-
ters is a Norton amplifier It
differs from the common
741 op-amp series in that it is
a current-differencing de-
vice. The main consequence
of this difference is that it
makes the amplifier a lovv-
impedahce device as op-
posed to the high-imped-
ance 741, Further informa-
tion on the LM.3900 is avail-
able from National Semicon-
ductor Corporation in their
AN72-15 Application Note.
With the values shown
and careful alignment, the
2295-Hz mark filter achieves
Sensitivity
0.1 volts p-p
Input filter width, 3 dB
170 Hz (adjustabte)
Space fitter width, 3 dB
85 Hz (adjustab e on panel
from 1700-2700 Hz fo)
Mark filter width, 3 dB
85 Hz. 2295 Hz fo
Shift reception
100-600 Hz wrth botii mark
and space filters in use;
adjustable from panel
Adjacent-channel filter
rejection
20 dB
Dynamic range (limiter out)
>3QdB
Minimum threshold
separation
0.2 vofts
Output
5 volts (1) or 0 volts (0) on i
space or mark
' Supply voltage
+ 12.5voits
Current drain, space on
100 mA; add 100 mA for
relays
7ab/e t. Terminal unit specifications.
73 Magazine • April, 1984 71
Photo C internal view, AFSK board at top right
a 3-dB bandwidth of 85 Hz
This value is about optimum
for any of the RTTY modes
encountered in the HF
bands. The space filter is
that part of the design which
provides the capability for
copying different frequency
shifts and varying bandwidth
signals. Front-panel controls
allow the operator to tune
the filter for a 3-d B width of
85 Hz at the nominal 170+lz
shift frequency of 2125 Hz
or tune the center frequency
over a wide range of values
to accommodate other fre-
quency shifts.
With the component val-
ues shown, the old shift of
850 Hz cannot be tuned.
This was considered an un-
necessary requirement that
would have lowered the Q
and response of the filter.
Obviously, the wider shifts
can be implemented, if de-
sired, by switching in differ-
ent component values.
Although the specifica-
tions in Table 1 indicate that
100 Hz is the lowest fre-
quency shift copyable, the
TU will copy smaller shifts,
depending only on adjacent
channel interference and
fading. As shown in Fig, 1,
the skirts of the mark and
space filters are not steep
enough to provide more
than 20<1B rejection at fre-
quency shifts of less than
100 Hz, but if the only signal
in the passband is the de-
sired one and feedthrough
in the adjacent filter is not
72 73 Magazine • April, 1984
excessive, smaller shifts are
possible.
At my QTH, the TU is in-
terfaced to my TRS-80 com-
puter through a Macro-
tronics M80 unit, Only the
space frequency is required
for copy. However, this is
not an advantage w^hich al-
lows only one channel of the
RTTY signal to be processed
from receiver to computer
Rather, if such a scheme is
attempted on other than a
clear FM channel, noise and
interference will cause er-
ratic copy and an amount of
"garbage'' which is directly
proportional to the speed of
the desired signal versus
ihat of the noise/interfer-
ence., This anomaly occurs
due to the fact that, in a
single-channel system which
reacts only to the space sig*
nal level, when the desired
signal IS not there (normal
mark condition! a time span
is open to receive any type
of interference which might
simulate a space signal.
This problem can be mini-
mized by clocking the de-
sired signal only, but cannot
be completely eliminated
due to the variation which
must be allowed for pulse
timing. Therefore, the sim-
plest method of precluding
the occurrence is to process
the mark signal in the normal
manner in the TU and use its
detected level to keep the
output from switching in the
absence of a space signal.
Of course, this method is
not valid for copying CW us-
ing the space frequency fil-
ter. In this mode, we rely on
the threshold control to set
the switching circuit input to
react to the desired signal
level only, while the mark
channel is switched off. Al-
though the design allows the
separation of desired and
undesired signal levels to be
within 0-2 volts of each
other, the desired signal
must always be the stronger
for reliable copy.
The facility for reversing
mark and space filter out-
puts for AFSK operation is
included in the design; a
Flesher FS-I AFSK oscillator
board is installed in the TU
cabinet for transmitting in
this mode on FM.
Circuit Description
Audio input for the TU is
obtained from the receiver
speaker jack, as shown in
Fig. 3. A jack on the rear
panel allows the connection
of a speaker which can be
turned off via a front-panel
switch. Transformer Tl con-
verts the 4/80hm audio
input to a 500/600Ohm im-
pedance signal which is con-
trolled in amplitude by a
front-panel-mounted 5k pot
and switched either to a
phone-patch jack or the
RTTY/TU position for the de-
modulator. The 8.2k-Ohm
resistor precludes loading
down the U1 filter input,
while the back^o-back diodes
ensure that the input signal
will be clipped at a level
which precludes overdriving
Ul
Relay K1 allows filter Ul
to be switched out of the cir-
cuit to enable copying wide-
shift signals outside of UVs
passband. Bandpass filter
Ul consists of a 2-pole con-
figuration tuned to a center
frequency (fg) of 2210 Hz.
Trimmers R1 and R2 allow
the tuning of the filter poles,
while the overall Q and gain
of the circuit are controlled
by the 27k-Ohm feedback
resistors. The response with
this filter, as shown in Fig. 1,
sets the overall bandpass ca-
pabilities of the TU. Test
point TP1 provides a con-
venient monitoring point for
the output of the bandpass
filter.
Limiter U2 captures the
strongest signal provided at
its input and maintains the
output level of that signal
despite a decrease in signal
strength caused by fading or
adjacent signal ''pulling/'
The operation of the limiter
circuit for varying signal
levels is depicted in Fig. 2.
Trimmer R3 sets the offset
voltage on pins 2 and 3 to
plus six volts, while the
390kOhm feedback resistor
controls the gain and sym-
metry of the limiter. The
output of U2 is a symmetri-
cal square wave monitored
via TP2.
Relay K2 allows the lim-
iter to be switched out of the
circuit for better reception
of AM/CW-type signals.
Transistor stage Q1 main-
tains the signal level to the
mark/space filters when U2
is switched out and clipping
diodes in the base circuit en-
sure that the signal level
does not reach a point at
which the filters will be
overdriven. When relay K2 is
activated, relay K3 also
switches input resistors to
the mark/space filters to
maintain appropriate signal
level.
The mark and space fil-
ters. U3 and U4, operate
similarly to bandpass filter
Ul. The mark frequency of
2295 Hz is set by trimmers
R4 and R5. while the space
filter frequency of 2125 Hz
(or other shift frequency] is
set by two pots located on
the front panel. The output
of these filters is a sine wave
which can be monitored at
TP3 and TP4.
Relay K4 allows the mark
and space filter outputs into
the detectors to be switched
for AFSK or reverse-shift op-
eration. The detectors con-
vert the sine waves from the
filters to a doubled dc level
and filter the remaining ac
to ground. Test points 5 and
6 provide a means of mont-
toring the detector output
voltage and ensuring that
II
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both mark and space signals
are equal in level. The
diodes in the base circuit of
Q2 and Q4 prevent any in-
teraction between the de-
tectors and transistors, while
57 deactivates the mark out-
put for CW or space-only
operation,
Pot R9 is mounted on the
front panel and sets the
threshold level to Q4, which
in turn determines at what
point output transistor Q8
will switch to "on." This ca-
pability precludes triggering
on interference or signals of
the same frequency as that
of the desired signal but
tower in level. When S7 is in
the open position, Q2 can-
not receive the necessary
bias to drive mark indicator
Q3 into conduction or turn
Q4 off, preventing an out-
put. Thus, any interference
in the mark channel during
CW or space-only operation
will not affect copy.
When driven ''on" by the
detected space signal, Q4
draws current and applies
approximately 4.5 volts on
the emitter. This voltage and
available current then turn
on Q6 (to give an LED indi-
cation of space) and Q7,
which drives Q8 to the on
state, switching the high in-
put from the Macrotronics
M80 interface key terminal
to ground.
Construction
The TU circuitry was fab-
ricated using a Radio Shack
prototype board (which has
solder pads for each hole)
and point-to-point wiring.
This is a time-consuming pro-
cess requiring careful atten-
tion to detail to prevent
shorts. However, this proce-
dure was adapted in lieu of
the hassle of designing a
printed-circuit pattern and
to allow ease in circuit mod-
ification between breadboard
and final-design stages.
Almost all parts are avail-
able through local Radio
Shack stores; the part num-
bers listed are Radio Shack
numbers. Major exceptions
are the power-supply trans-
former and the AFSK gener-
74 73 Magazine • April, 1984
LIM^TEfi OUT
LlMITER 1N
OUTPUT SWITCH POINTS
_L
_L
X
3 4 &
AUDIO [VOLTS RMS]
fi
Fig. 1. Circuit performance curves.
ator board. The power-sup-
ply design is not shown since
any supply of 500 milliamps
or better will work. A regu-
lated voltage is necessary to
ensure constant filter pa-
rameters; this requirement is
easily accomplished via a
12-volt 1-Watt zener diode.
Although Radio Shack
stocks 12-volt transformers,
these units are not enclosed
in a metal shield. The metal
case is necessary to prevent
coupling of the ac field into
the audio lines and circuit of
the TU. Appropriate trans-
formers are available from a
number of supply houses
such as Circuit Specialists
or froin local consumer
electronics repair shops
which handle Japanese
equipment from Panasonic^
Pioneer, etc.
Vernier dials or lO-turn
pots were considered for the
space-filter tuning controls
but not irtpprpprated due to
the increase in cost over the
last year. However, good-
quality pots are necessary
to preclude dead spots or
dropouts when tuning. The
FS-1 AFSK oscillator board is
available from Flesher Cor-
poration, PO Box 976,
Topeka KS 66601, with con-
nector, for $37.50.
Circuit-board wiring is not
critical, with the exception
that components such as ca-
pacitors, which are located
in each mark/space channel,
should not be placed in close
proximity to each other (to
prevent adjacent-channel
signal pickup). Those capaci-
tors which function as fre-
quency-determining compo-
nents in the filter circuits
should be of mylarT^"^^ or
polyester construction while
others may be of the disk
type.
Resistors are quarter-
Watt, five percent, for mini-
mum board-space require^
ments. Sockets are used for
all integrated circuits, but
transistors are soldered di-
rectly to the board, Intra-
cabinet wiring for audio
lines should be shielded and
the power-supply ac wiring
kept away from other ca-
bles. The DIP relays should
have a dab of contact ce-
ment applied to each side
where the relay touches the
socket to ensure that vibra^
tion does not cause them to
rise out of the sockets.
The Radio Shack Mode!
270-253 cabinet provides
just enough front-to-back
space to mount the proto-
type board and connector
on the bottom of the chas-
sis. There is space on either
side of the board for the
power supply and input-
audio transformer. The
AFSK board is mounted
above the TU board with
Gbflhectdr brackets made
from thin aluminum stock
and anchored by two of the
front-panel switches and an
L-b racket support from the
rear panel. Intracabinet wir-
ing is shown in Fig. 4,
Power-supply wiring
should be done first in the
enclosure, followed by the
TU-board connector wiring.
Installation of the switches,
pots, and jacks is then com-
pleted, followed by installa-
tion and wiring of the AFSK
board/connector. The space-
filter tuning pots are mount-
ed in the front panel so that
the left and right controls
both have maximum fre-
quency setting at a marking
between the two. Wiring to
the pots must be reversed
on each to allow the left to
operate in a clockwise direc-
tion for maximum frequen-
cy while the right pot is
moved in a counterclock-
wise direction for the same
frequency. Decals or trans-
fers should be applied to the
front panel to indicate scale
marks around the control
knobs.
Alignment
After the normal checks
for solder bridges and
power-bus shorts, alignment
can begin. None of the
switches needs to be con-
nected for calibration, but a
shorting wire should be con-
nected across the S7 diode if
it is mounted on the board.
Use temporary connections
to the LEDs, which will be
panel-mounted later. As a
signal source, an audio sig-
nal generator is required. If
that piece of test equipment
is not part of your inventory,
you might consider building
a breadboard variable audio
generator using a function-
generator integrated circuit
or a 555 timer chip.
Another option is to use
the calibrator on your trans-
ceiver and adjust the beat
note to provide the nacesi-
sary audio output In any
case, a frequency counter is
required to ensure that what
you see is what you get. The
fifters are extremely narrow
and any alignment which is
off the desired frequency
will produce tower gain, dis-
tortion, and undesirable op-
erational characteristics.
An oscilloscope is helpful
in tracing the signal and con-
firming relative waveshapes
and amplitude. However,
the Q of the filters, which
makes precise tuning/align-
ment essential, precludes
the use of the scope for
monitoring maximum filter
response while calibrating.
A VOM/VTVM with a dB
scale is much simpler to use
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Telex 78r 2022452
WSf
4
for this function, After
coupling via a 0.1-uF
capacitor from the ap-
pitcable test point, the
meter will show the change
in signal level as the filler is
aligned to the input frequen-
cy Anv oscillation or false
response will exhibit a
higher-than-normal swing of
the VOM needle and should
be monitored by the
oscilloscope-
As a first step in the align-
ment procedure, adiust R3
for plus six volts at pins 2
and 3 of limiter U2. Next at-
tach an input signal source
of 2210 Hz to the input and
couple (via a 0.1 -uF capaci-
tor) the output of filter Ul
from TFI to the VOM/VTVM
which has been set to the
10*volt scale- Adjust Rl and
R2 until the meter indicates
maximum output at this fre-
quency* The i-dB band-
width will now be approxi-
mately 160 Hz
If you do not desire to
copy anything other than
170-Hz shift in Baudot or
110-baud ASCII, the re*
sponse of the filter is fine.
However, if you desire to
use the filter for 300-baud
ASCII, you may wish U^ m-
tune the bandwidth to in-
crease the width and noise
characteristics. This may be
accomplished by alternate-
ly changing the frequency of
the input signal from 2125
Hz to 2295 Hz and adjusting
Rl and R2 for a meter read-
ing 3 dB below the maxi-
mum value obtained at 2210
Hz. Repeat this procedure
until the meter reading at
both the mark and space fre-
quency is equaL
As you change the input
frequency from the tower to
the higher frequency, you
will notice that maximum
gain is still at 2210 Hz, show-
ing that the response has not
been degraded but only wid-
ened at the 3-dB point via
stagger tuning. Note that
this adjustment will not af-
fect the capability of the
bandpass filter to accept on-
ly 170'Hz-or-less shifted
signals.
If a scope is available,
76 7B Magazine • April, 1964
BANDPASS
15
ie IT 10 19
to Mi
FnEQUENCYIHixtOO)
Fig. 2. Active filter response.
check the output of the lim-
iter, which should appear as
a square wave of equal
pulse widths. A check of the
filter outputs should show a
sine wave without distor-
tion Once the input signal
has been set to the timiter
capture level, which is
matched to the limiting ef-
fect of the diodes across the
input and the gain of Ul,
there, should be no notice-
able change in output am-
plitude for further increases
in signal level.
Bandpass filter U3 is
aligned at 2295 Hz in a man*
ner similar to that accom-
plished at Ul, Use TP3. a
0,1 -uF capacitor, and adjust
R4 and R5 for maximum me-
ter indication. No further
tuning for widening the re-
sponse of this filter is
required.
Bandpass filter U4 is
aligned during operation
from the front panel by pots
R6 and R7. After wiring the
pots and connecting the
leads to the circuit-board
connector, ensure that a fre-
quency range of 1800-2150
Hz can be covered and that
when both pots are set to the
same frequency, the output
level is approximately the
same as that provided by U3
at its center frequency.
During the alignment pro-
cedure, the appropriate indi-
cator LEDs should have
lighted as the filters were
tuned. If all is well to this
point, continue the align-
ment Otherwise, go back
and determine where the
problem exists.
Set the input frequency
for 2295 Hz and attach the
meter leads across TP5 with
the meter set to read 5,5
volts dc- Record the indicat-
ed value. Now, move the
meter leads to TP6 and
ground and change the in-
put frequency to 2125 Hz.
Adjust the front -pane I filter
controls for maximum me-
ter indication and note the
value. If the two readings
are not the same, adjust R8
and repeat the procedure.
Note that equal output of
the detectors is mainly de-
pendent upon the alignment
of Ul to pass equally both
frequencies and the align-
ment and gain of U3 and U4.
Since the mark and space
voltages drive different
parts of the circuit after de-
tection, you should check to
ensure that both LEDs light
with the same level of input
signal Set the signal genera-
tor for 2125 Hz, tune the
space filter for maximum
output/LED brightness with
the FSK/CW/AFSK/Reverse
switch in the FSK position,
and lower the generator lev-
el until the LED is just light-
ed, ff the FSK switch is not
yet wired into the circuit,
the relay will still be in this
position, unactivated. Now
put the switch in the Reverse
position, or apply 1 2 volts to
the relay lead for K4, and
note the brightness of the
mark LED. If the mark and
space LEDs do not light at
the same level, adjust R8 un-
til they do.
Depending on whether
you have used the mark or
space signal to provide a
high or low output, the ap-
propriate LED should illumi-
nate when that signal is ap-
plied to the input The out-
put should measure either
4 5 volts at the "1 " jack or al- '
most zero at the '0" jack |
Check the front -panel „
switches to ensure that they
all work, activating the re-
lays or switching the appro-
priate parts of the circuit in
or out. A continuity check
with the VOM of the out-
put/input jacks on the rear
panel will prevent surprises
after the cover is attached.
Operation
After a complete bench
check and filter alignment,
you are ready to place the
TU on line and connect all
the interfacing cables On-
line tests should start with
reception of various RTTV
signals to allow you to be^
come familiar with the op-
eration of the TU\ Some ap-
prehension was originally
felt during the design phase
about the ability to tune a
signal into the mark chan-
nel before tuning the space
filter. Operation of the
completed unit has shown
that this is not really a con-
cern and that the procedure
is quickly learned. I had
also previously installed a
1-mA meter on the original
space output LED of the
Macrotronics M80 inter-
face, which helps in the
fine-tuning of the space fil-
ter and displays the actual
level of the switching signal
from the TU.'
For normal RTTY opera-
tion, with all fitters and the
limiter in operation, the
audio-level control on the
receiver need only be set in
the low range, 2 or below,
for a front-panel scale of 1
to 10. The level control on
the TU will then provide sat-
isfactory copy for an S9 sig-
nal when set about one-third
of the way into its range. It is
important to ensure that the
IIV . 11
ml]
«Hh
SANTEC
ST-142
rt fiCUUU
Ml
M?
M3
SCAN
3
CD
Fl
E
M4
M5
M6
A
HOCE)
M7
MS
M9
,,^MK^^^^ ,^H|^BMait .^B^V^^k. .^^^^^^Sh
qCbJCDCe]
M0 OS M/MW
SET
^^a
LOCK
P
OFt- Ol4
ii>x Dpx rnEO etK
I Ml
orr OM
I n 1 1 L • 1 1 ' =-J ' •
FOR 1 44 VHI^ 220 VHF & 440 UHF
SANTEC Handhelds just got a little smarter, with new com-
putcf-control software designed by U.S Hams who are afso
professional programmers Horn SANTEC Handhelds, which
were Ihe first to offer you varactor diode tuning in a hand
held, first to offer you thick-film technofogy, first to provide
35Wasa selectable handheld cation and first to give you the
time of day on a handheld read-out, have made another user-
friendly leap forward in the logical progression of computer-
controlled handhelds.
Now three SANTEC Handhelds can lock out selected memory
channels from the memory scan, allowing you to check your
favonte frequencies much faster, without interruption from
less commonly used ones or from unprogrammed memory
channels. SANTEC Handheld s new operating programs now
allow you to store variable offset values in all 10 user-written
memory channels; and, as always with SANTEC Har^dheids,
your stored offset automatically comes back when you select
a channel through the memory mode, and the plus or minus
indication shows on the LCD display.
Other new features are the provision in Memory 9 for split
memory offset operation, for those really unusual offset situa-
tions, and the capacity for hardware storage of a special PL
tone for each memory channel (requires an optional
encoder, available December, 1983X The new SANTEC Ha\}&
helds will also accept the keyboard input of ail frequencies as
either short, fast 4>dlgit numbers or the familiar a^digit ver-
sions: your SANTEC Handheld is smart enough to know what
you want, either way
The handhelds with the most now have more for you Don't
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Handheld today!
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"" ^' .. , -^ ine nrw Hdlc a* the art m fYonaneki traRsce t^r
(§)"
THE HANDHELD TRANSCE[VERS
Am 'Aiit&tl
'*k^\iQii&aK U4t)t(;i.i IX* ^f}^)^ ^Ai^iiiM ik^l
Tbe Smaite* Handhckte, ctodewisc ffDm upper icftr 51-142 VHF Trweceivcf;
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Strap. 5T-MC Mobile ChafSCf- MS- SOS Remote Speaker, ST-500B3
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to
PHONE
UKBP FILTER 2£iOHi
AUDIO
Fig. J. Terminat unit sche-
matic. T1: 8-Ohm primary,
600-Ohm secondary, or
273-1380. U1, U3, U4: quad
op amp 276-1 71 3, U2: 741 op
amp 276-007. Q7; 2030
276-2030. Q2^Q7: 2N2222
276-1617. Q8: 2N1305
276-2007. K1^K4: 12-V DIP re-
lay 275-213. LEDs: jumbo
276-021. AH front-panel pots
have linear taper; all others
are miniature trimmers.
input level is great enough
to place the signal in the up-
per portion of the limiter
curve for reliable copy on
fading signals.
The threshold control is
nprmally ieft in the extreme
counterclockwise position
unless it is being used to pre-
vent triggering of an interfer-
ing lower-level signal. Once
the space filter controls are
$et to the approximate shift
value by the front-panel
markings, the signal can be
78 73 Magazine • Apr! 1,1984
.1 (ON BOARW
^"l" ON SPACE
+5V FROM
UQO TU IW
flV ON SPACE
tuned to give an indication
on the mark LED. If correct-
ly tuned, the meter on the
M80 will show no deflection
if there is no space signal.
Depending on how close the
original settings on the
space filter controls were,
the space LED may flicker
or light with a corresponding
M80 meter deflection. The
tuning of the first and then
second space-filter pole
controls will display an
equal mark/space LED in-
tensity and maximum space
signal on the meter.
Printer or CRT copy
should also be evident.
Switching to AFSK/Reverse
should reverse the mark/
And you can see it — in color — again and again
when you own the N2NY Ham IVIasterTapes.
Ever see a cap discharge in slow motion? You will on
Ham MasterTapes. Ham MasterTapes can perform the
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Finally a step-by-step course in Ham Radio Theory
is available on color videotape. The Larry Home N2NY
Ham MasterTapes video course is a unique, effective
teaching technique expertly produced by New York's
leading professionals in studio and field videotape,
n Video Graphics highlight important details.
n Carefully worked-out demonstrations on video avoid
the problem of getting complex gadgets to work on
command in front of a class.
n Working examples of every ham
radio component, device, or system
covered in the FCC guide can be
clearly understood.
The N2NY Ham MasterTapes give you a basic
grasp of concepts that build theory background — not
only for passing the FCC tests, but for understanding
electronics.
*^iGi
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THE N2NY HAM RADIO COURSE ON VIDEOTAPE
The hobby has long needed better, clearer, high-
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These six-hour tapes cover completely all the ma-
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Theory and operations, and include the new 200-ques-
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Only $199.95, Order direct and specify Beta or VHS
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at
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0 1983 N2MY productions, Inc.
TO HF TRANSMITTER
M80 fliLAY
Hl-l LO-I HC COM
+ 12 IV *■
TO weo
FSW/t*
space LED indication and
meter response and print
garbage The only differ-
Fig. 4. Cabinet wiring.
ence in receiving AFSK, as
opposed to FSK, with the
function switch in the AFSK/
Reverse position is that you
are now receiving the
2125-Hz signal on the mark
Parts Ust
Part No.
Description
276-153
Plug-in circuit board
276^1551
44-plo card^edge connector
273-1380
Audio output transformer
EM 28
115/12*volt transformer
276-1713
LM3900 quad op amp
276-007
741 op amp
276^2007
2N1305 transistor
276-2030
2N305 transistor
276-161?
2N222 transistor
273-213
12'V subminiature DIP relay
276-021
Jumbo LEDs
276-060
LED holder
276-563
12- V, VW zener
270-253
Enclosure
276*1995
B-pin DIP socket
276-1999
14-pin DIP socket
275^24
SPST toggle switch
27S«25
SPOT toggle switch
E2469
2'position, 6'pole rotary switch
276-1123
1N270/1N34 diodes
276-1122
1N91 4 diodes
272^1029
220-yF (150-uF) electrolytic
276-1101
Rectifier diodes
271-210
500k pot (place 270k fixed
resistor across for 200k)
271-226
500-Ohm trimmer
271-1714
5k pot
FSrI
AFSK board/kit
M1143
AFSK board connector
Miscellaneous fixed resistors
Miscellaneous capacitors
274392
Knobs
274-346
Phono jacks
73 Magazine •
April, 1964
Source
Price
Radio Shack
$ 3.69
Radio Shack
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LED. This is due to the fact
that AFSK mark and space
frequencies are reversed for
VHF operation. Therefore,
the tuning of the filter con-
trots must be monitored on,
the mark LED and the first
tuning (if not channehzed
FM) done on the space LED
and M80 meter. It is easiest
to tune in the normal man-
ner and then switch to AFSK.
For CW or AM signals on
HF (such as AFSK), vo<J m^V
find that switching the limit*
er out of the circuit will pro-
vide better reception when
noise or interference is pres-
ent. When this is done, the
input level should be adjust*
ed to maintain a reliable
switching point and com-
pensate for the hold-in range
of the switched-out iimiter.
The same level adjustment
should be made when
switching out the bandpass
filter to copy shifts wider
than 170 Hz.
Referring to Fig. 4, the
FSK/CW'AFSK transmit
function switch makes all
connections for the selected
mode. The relay on the M80
interface board is activated
by the computer in trcinsmit,
but all relay contacts are
brought to the TU for the ap-
propriate mode connec-
tions. In AFSK, the relay con-
tacts are connected directly
to the transmitter vfo.^ In
AFSK, the relay contacts are
connected to provide a
mark/space keying input to
the Flesher AFSK board.
The CW output of the
M80 interface is connected
to the ID input of the Flesher
board through a switching
transistor which precludes
transmitting theCW ID tone
at the same time as the mark
tone. When the transmit
function switch is in the
AFSK positioa the mark
tone is on and a 2125+12 sig-
nal is sent to the transmitter
The AFSK board has the ca-
pability of supplying either
850" or 170-Hz shift Since
only 170-Hz shift is used at
my QTH, the 170-Hz posi-
tion is hard^vired on the
AFSK board connector
Specifications: (40M-4)
FREQUENCY ..... 7.0-7.3 MHz
20dB
FEED IMP-: 50 ohms
ELEMEOT' LENGTH: - ... 46 a
BOOM JLENGTH: 42 ft.
WINBLOAD: ••,,,,.,. 12 sq, ft.
GAIN: 7^dBd
KLM
electronksj Inc.
Full Line Pefformance
The Mbi^dimS prfonxiflHee 01 IHe Wor
Class KLM 40M-4 is used by many DX*ers as
a "Standard of Comparison" in Competitive
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Obviously, not everyone needs this troe of
Awesome performance, but its nice to know
that the same performance proven design
theory and qusility construction have been
carried over into our full line of qi
antennas for all h-equency ranges.
Specifications: (20M-'.,
BANDWrniH: . . . 13.9-14.4 MHz
#SWK: 1.5:1
%B.. 35 dB
FEED IMP.: 50 ohms
ELEMENT LENGTH: .... 37 ft.
BOOM LENGTH: 57 ft.
WINDLOA0: 12.8 sq. ft.
vmm}
Speciicatioiis: (15M-6)
BAISIBWTDTH: . . , 21 .0-21 .5 MI^
.^ySWH:... .....<. ..1,5:1
F/B: .....30dB
FEED IMF.: ..:m ohms
ELEMENT LENGTH: , . * . 25 ft
BOOM LENGTH; 36 ft.
WINDLOAD:, , 8 J sq. ft*
GAIN: ,^^^m^.. 10 J dBd
BANDWIDTH:. . , 10.1-10,150 MHz
VSWR:, L5:l
F/B. ...... 20 dB
FEED IMP.: . - - 50 ohms uiibah
ELEMENT LENGTH: .... 35'6^*
BOOM LENGTH; , . , 24*3''
^^^'"^mBlimm 7 sq. ft:
'AIM;
Fy :.i5: ; ; ■•■ ■--ia'vr
And there's more!
See your local dealer or write to KIM, ElectronicSt
RO. Box 816, Morgan HiU, CA 95037,
(7-2/10-30^7LPA)
BANDWIDTH: ,,7,2/10 30 MHz
VSWR: ..2:1 typical
F/B: ;. 10/15
FEED IMR: 50 ohm unbal
ELEMENT LENGTH: .... 46 ft
BOOM LENGTH , 42 ft
"" NDLOAIK^.^ 12 sq. iL
^^^^V7 dBd typical
■>■ ■ v-'lR ■■:■ <--:':>:^ ■« !:i i-r^RX^gfia- MMMggMBEi ■■; yy.
80M IN 24 FT!
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Put a broad bandwidth BOM d/pole in 24 ft with the
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Ask for FREE antenna companson sheer
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Virginia resident >^
add 4% sales tax n
Most rigs will take the low-Z
output of the AFSK board,
but both the levels are
brought out to the rear
panel for use as required.
The FM/'HF switch selects
both the audio and push-to-
talk relay line from the
desired transmitter. When
using the M80 interface unit
with the M800 software, a
PIT module is provided
which automatically ac-
tivates the transmitter The
M80 PTT output is the con-
trol line which is switched in
the TU.
lor CW operation, the
CW/Space Only switch is
used to inactivate the mark
circuitry in the TU. Only the
space LED is used for tuning
with the filter controls, to
provide maximum M80 me-
ter deflection. The threshold
control can be used to set
the switching level to pre-
vent lower-level adjacent-
signal interference. In CW
transmit, the transmit func-
tion switch connects the CW
output of the Mao through
the TU switch to the trans-
mitter key input This same
connection is made for FSK.
Operation has been both
gratifying and educationaL
It is interesting to watch the
independent fading of mark
versus space signals, as
shown by LED brightness
and M80 meter deflection.
The only other evidence of
poor copy occurs when the
signal of interest fades while
a background signal, which
was not heard before, in*
creases in strength and cap-
tures the limiter. Good copy
has been obtained on low-
level signals which arc not
strong enough to provide an
LED indication. ■
References
^.Speciatized Commumcations
Techniques, ARRL.
Z "Active Banrfpass Filter for
RTTVr Nat Slinnette W4AYV.
ham Radio, April, 1979.
3. "Welcome to the 'SOs/' R
Dale WMIiams KSPUR, 73, July,
1980.
800-882-1343
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TS-e30S (Choice of SOOcy CW Filter or SP'230>
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FV-707OM
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In San Diego P.O. Box 1762
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Call (714) 463-1886
Mnn.-Sitl.: 10:00 d.m. tu 5:00 p.m
S2 73 Magazine • April, 1984
Ci^
1 11 1 . i i 1 PI 1
^m
Our new HD-3030 Computer Interface Termina
takes you around the world on RTTY and CW
PERFORMANCE
The HD-3030. a computer and
software are all you need for uni-
versal RTTY Baudot. ASCII, and
Morse Code communication. The
HD-3030 provides reliable decod-
ing of RTTY signals up 1o 300 baud
in 170Hz, •425Hz and '850Hz
hightone shifts while crystal-
generated AFSK tones provide
superb stability for transmit. Inter-
national Morse code can be cop-
ied up to 100 words per minute. A
built-in loop supply is included for
hard copy with earlier teletype-
writers when a computer is not
available.
CONVENIENCE
Front-panel push buttons allow
finger-tip control of all HD-3030
functions while complete com-
mand information is instantly
relayed by LED status indicators.
VERSATILITY
The HD-3030 is RS-232 and TTL
computer compatible, offering a
full complement of rear-panel con-
nections for greater versatility The
HD-3030 keys any transmitter -
AFSK. FSK, positive or negative
key line, tube type or solid state. It
even has a provision for scope
mark and space output.
There's more for the Ham at Heath.
See our complete line includmg computers, SS-9000 computer
conlroJIable transceiver and SS8 CW RTTY active audio filter.
Order toll-free MasterCard and Visa: 800*253-0570.
Outstanding quality. Superb per-
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Interface Ternninat - then simply
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*Oplional accessories includG Ibe HD 3030-2
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Write today: Heath
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Or visit your local
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•nil
"'U^its o^ Vemechfiolog/ Eftctforvics Corporafion m ttie US
AM-44D
Wheeling and Dealing
with Preamps
For a switch, from the remote hills of
West Virginia comes a great antenna idea.
Robert E. flrossman W8PMS
175 Oakmont Hilh
Wheeling WV 26003
An Qverall view of the completed preannp.
ftlAS METWORK
C*PS
"mOuSH LINE
*S0tCN0lf> COULD
GO MERE
;0Z39
^.>'^— 30E19
After many years of 2-
meter FM operation, I
found myself increasingly
interested in SSB operation
on the lower portion of the
band. After spending an
evening in the shack with
Don WB8ZTV and hearing
for myself the potential of
SSB and CW operation, I
was soon the proud owner
of a brand new all-mode rig.
The old n -element verti-
caliy-polarized beam soon
went to its storage place
(holding up tomato plants)
and a homemade 6-element
horizontal took its place on
the tower. Local FM opera*
tion was unaffected by this
change, and contacts out to
75-125 miles were possible
with the 10-Watt output of
the all-mode rig.
J
S0239
fiELAT CONTACT
OLASS FE£0 ttimjS
r
PCQ 0^
M
IB n di
^^ ^
CROUNOtNG
CONTACT
PREAMP INPUT
Fig, 7, The approximate method of fabricating the doubte-sided printed circuit board base
and shielding of the preamp. The shields are covered with copper foil 'lids'" that are
soldered to the edges of the shield enclosures. The drawing also shows the mechanical
details of the switching contacts.
M 73 Magazine • April, 1984
A 4CX250 amplifier that
provided around 300 Watts
output in linear or Class C
had been around for a while
and this enabled occasional
contacts in the range of
150-200 miles. Before any-
one scoffs at the limits, let
me remind them that this
area of West Virginia is
quite hilly and that 1 live
well below the tops of
the surrounding aforemen-
tioned geographic features;
hence, I felt reasonably
pleased with the perfor-
mance of my equipment.
My only problem was lis-
tening to Don run his week-
ly SWOT net and realizing
that I didn't hear half of the
stations that he was rou-
tinely conversing with week
after week. Now. don't get
me wrong, I fully realized
that he had a superior loca-
tion, stacked 8d-element su-
per whjzbangs. and an an-
tenna-mounted GaAsFET
preamp, so I decided that
my first proiect would be to
try putting together a re-
spectable preamp to mount
at the antenna.
After researching several
articles on preamp con-
struction, it became appar-
ent that one of the major
problems and least dis-
cussed chores associated
with remote devices such as
this was switching the pre-
amp in and out of the trans-
mission line during use.
ALL ITEMS ARE
GUARANTEED OR SALES
PRFCE REFUNDED.
PRICES F.O.B.
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PRICES SUBJECT TO
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inside Texas 1-713-331-2235
Phillystran HPTG 6700 ..... 69e/ft.
Potting Compound 12,95
Ends 7.95
Alpha Delta,.,,,,,. 10% OFF UST
HeJI Sound..,.,,.,. 10% OFF LIST
AMECO Preamps ... 10% OFF LfST
FoxTango Sherwood 10% OFF UST
Tokyo fTighpower HC400L
tuner ,.,..,.. ,119.00
ETO-Alpha CALL FOR
UP TO MINUTE QUOTE
Anteco 5/8 wave 2nn
Magnet Antenna , 25.00
Amphenol 2900 Bnc Male
UHF Female Adapter NT . . , . 4.00
Yaesy NC1A charger ft 207Ra6.00
Robot 1200c high resolution
color SSTV ....... 1139.00
450c color SSTV 789.00
800c/600ch RTTV/CW .... 789.00
400c kit. ..469.00
800c kit...... 155.00
BIRD 43 6t etements ..... STOCK
We Take Special Orders
Collins
KWM2 S/iine crystals . . 12.00 ea.
CaJIbOOkS 1982 DX 5.00
Callbooks 1963 DX, . . . , 9.00 ea.
Limited quantity
WM NY£ MB4-2 Tuner W Balun
3KW , 399.00
|^g*5 , _ .479.00
MB1*2 Baiun l66 watt' " ' 'iSSioO
Coox-Sealp QSL holders . 2.00 ea.
73 Code Tapes STOCK
New Whites Radio Log 4.95
1964 World Radio
J\/ Handbook ,1 7.50
Universal Electr, ARRL TAB, SAIVIS.
Rider. ORR. Gilfer STOCK
ARRL Ham Radio.
Yaesu Logs STOCK
GE 6146B 9.95
Trippltte PR25 regulated
20 amp, . , . , . .99.00
PR35 regulated 30 amp 169.95
Belden S235 300 ohm Kw
Twinlead 20^ /ft,
EiMAC 3-500Z , . 99.00
Spragiie 500PF/3OKV
doorknob 1 6.00
NEW Viewstar Amps
PT1000A 1 kw linear
rugged constructioa utilizes
3-5U0Z ,,.,.,. 829.00 less tube
with EIMAC 3-^6002 929.00
PT2500A 2.5 k amplitier
3-5002 ,..,.. 1295 00 less lube
with 2 ea. EIMAC 3-500Z 1495.00
Drake Closeout
Accessories .,,..,... DISCOUNT
RV7.... 150.00
550 ,,...379.00
160M CW KW input trans . . 295.00
Kenwood TS-530SPREAL BUY-CAU
Cushcratt Proline distributor CALL
Benctrer STl BY1 42.00 ea.
ST2, BY2 .,.,,,, 54.00 ea.
Big Ham Clock 2 LCD Clocks
1 2/24 or 24/24 format , . , , 25.00
MADISON USED CORNER
All guaranfeeci 90 days, items may t>e used for full
trad© against new equipment for 6 months after
purcinase. Return before 15 days, sales price
refunded.
YAESU F101ZD , . 500.00
F901DM ., ,...,,.. 600.00
DRAKE TR7/PS7/NB/Fflters 1000.00
COLLINS KWM2/AC , , , 500.00
KENWOOD TS820S .500.00
TS520/TS520S 400.00 ea.
TS830S ,650.00
EIMAC 3CX2500 250.00
4-1000 150.00
Antenna Tuner waterproof 200vv',
roller inductor , . , 100.00
Call forFost Moving Items/Spectal Orders in Used &9arl
ANTENNAS
Rohn 25G, 45G, 55G, accessories . . . . , CALL
FK2546 foldover PREPAID 799.00
HYGAIN HG52SS PREPAID 949.00
TH7DXS......,,.,,, , 429.00
Explorer 14 . , . , . . . * . v. '. 289.00
HAM 4 199,00
V ^W -fe 1^11 II I-I- + I **i-***** kmttltimiHtmmi-T v7 ■ W%#
Hygain Accessories prepaid with Tower if
ordered/sliipped together.
BELDEN COAX
8214 RG-8 Foam , . , 40<
9258 RG-8X , 19*
8267 RG213 Mil « 49*
8448 8 Wire Rotor , . 27*
8000 14GA-standard antenna wire . . 12*/ft.
NEW 9913 Solid Center Coax.
Foil — Braid Shield . . . . , 42*/ff.
9914 , , , 42*/ff.
9915 HD Solid Center 2.30/tt,
KLM 2m 13LBA , CALL
l\ I W^4/~A 14^4 l**<t-*<^**t<* it ■■«! >ll4<1-i-4 t-ll iJsJr fUU
r\ P \^^^/^V \ * i l--kB«'fl.l«1 11 I I i II ^ t + + -k-l-i-l F II- "m T hk/U
420-470-18C ,.,.,.. CALL
Cushcraft Oscar Package 149.00
ATS-1 Turnstile 25.00
Alliance HD73 99.00
Dowkey Reray560 Series STOCK
B&W AV25 , 90.00
Radiol kit 19.00
B&W Dipofes STOCK
Cushcraft A3 , .219.00
Trlex Wr-51 , (FOB CA) 969,00
AEA Hotrod 16,00
Butternut Hf6V . . , , , 125,00
Hustler 6BTV 129.00
Amprienol PL259 siiverpiote 1.25
4400 NMALE-S0239 6.00
82-61 NMALE , 3.00
Alpha Delta 10% OFF
Q5-QRM 75m Broadband Coax Dfpofe 69.00
40m 59 OD
Madison Repoir
All Brands, Resonobie Rates. 5 Servsce Techs.
SUPRLUS GOODIES
All Fully Guoranteed
TCG 2.5A/1000 PIV Epoxy diode 29* ea.
$19.00/100
456 KHZ IF Transformer , , 49*
telay 2 PDI Enctosed. 12VDC/10A 5.00
Platemeter 50OMA/2-1/2" Square 10.00
5A.RF 15,00
a3000VDC ,.....,.,.,... .10.00
0-1ADC 9.95
Simpson 0-150VAC 4" square 10.00
Sprague 1000PF/500V feedthnj 1.95
CDE 001/20KV Axial end 1 .95
RG14 (40' max(mum) 50*/ft.
RG9 B/U 38' max 50*/ft.
VHF/UHF
Kenwood TR7950 , , . GREAT BUY
TW4000A ,..,,., BARGAiN-CALL
KDK 2033
new FM , , , $289.00
R726R-Oscar . . TTTT'. ....,.,.._,,., 699.00
1 * 4 H I
■*■ A- h -k
. . 95.00
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, 250,00
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.699.00
Satellite unit , , .
430 module .
Filters. Tones available
Santec ST142
ST144
it^ m t ^^^nr ■■■■■■ ■■ ■■ LI h H
ST7T ..,..,.,.,..
ST440up , . .
Tokyo Highpower HL30V
HL82V
■ ■ L^>i^4^ T Kb>i!i4lllriiriria^v
HL10 160V
HL25 160V , .
HL90U ,
FT290/790 Oscar , , .
KENWOOD TR2500 CALL
YAESU F208RA 259.00
TENTEC 2591 269.00
SANTEC ST142 299,00
HF
TS930S . . . . , BEST BUY
Fr980 Great Receive 1299.00
TS430S , . MOBILE BARGAIN
R757GX 749.00
Everrylhing Included Except the Ai^tomobJIel
F77 Mobile DXCC 519.00.AVMIC
Signal One Milspec 5995.00
Coll for Description/ Litorotur©
Cairad Meter 3-15aviHZ 2 meter 2P.95
FROM THE COMPUTER STORE:
AEA CPI/MBA Text, V1C20 or COIVtM64 CALL
, . . CALL
10% OFF
. . 29.95
NEW MICROPATCH MP20 or IV1P64
KANTRONICS. A£A Software . .
IBM Software ASCII/RTTV-disc .
Microamtor Patch '^
model MAP-64 ,....,. SI 29.95
This is fine Iqwest priced AMaTOR HARDWARE/
SOFTWARE unit avoflabte in the world today.
MAP-64/2 MBATEXT . Amtor Text
RTTY/CW/ASCI 1 /AMTOR
suggested price 1 99 95 CALL
MFJ 1224 , , . 79,95
MFJ 1224 /H 1250 or 1251 Software . . . 119.00
AEA TRS60 Mod 3 Software STOCK
AEA
A/iiance
AipTiQ Delta
AfTiphenoi
bt.sld6r-i Bugc-atch&r ETO-Aip^ia
BLitternut Af^tenrsas Fir'ico
Bird Benchet Fox Fongo
CL^shcraft LXiwkey Gilfer
CDE Draks .G£ Tubes
iRt
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Consumers Wire
1-800-231-3057
MamKeyer Kacihonics Kar^wood ivtiiage Nye
Rac?io Callbook
Rtder
Robol
Itonn
Rockw^EI-CoJIir'^ Sor^tec
Tenlec TAB Sufpius
teie3< Tripiett SAMS
TCG Sigr'ial One Vsbfoptex
Trjex Sprague WiTOG
Yaesu
A detailed view of the input contacts of the preamp. Tfie
glass feedthfoughs are visible, and the method of attaching
the relay contacts to the feedthroughs can be seen.
Some details of the output end of the preamp. The relay
contacts and the mounting of the solenoid are seen. The
copper foil covers of the preamp shields are not in place.
Being a peculiar type of
person that hates to cut and
strip coax for BNC connec-
tors, I felt that there had to
be another means of switch-
ing a device like a preamp
without the need for multi-
tudes of ^/i-wave cables
and 2 BNC-type relays.
What could be simpler than
making the whole PC board
(containing the preamp cir-
cuits) switch back and forth
with a solenoid?
After several attempts, the
mechanical layout shown in
Fig. 1 was produced. The rf
circuit does not represent
the state-of-the-art in VHF rf
amplifiers, but it does serve
to illustrate the concept
With the addition of a few
more contact strips, it
would be possible to ei-
ther ground the input and
output of the preamp dur-
ing transmission or switch
them to ground through
50-Ohm resistors. The latter
method seems to be the
manner of choice when us-
ing CaAsFETs,
The preamp is switched
out of the transmission line
until the solenoid is ener-
gized. Power for the pre-
amp is now supplied sepa-
rately through an extra pair
of wires in the antenna ro-
tor cable. A 24-volt-dc sup-
86 73 Magazine * April, 1984
ply is used, and an LM317
adjustable voltage regula-
tor is now inside the pre-
amp box. Remember to in-
clude the bypass capacitors
on the regulator input and
output. The solenoid is also
shunted with a IN 4004 di-
ode to protect against the
voltage spike produced
when the magnetic field
collapses on turn-off.
Isolation of the preamp
circuit during transmission
is at least as good as some
of the VHF BNC relays and
could be increased by phys-
ically increasing the spac-
ing between contacts. The
design routes the rf path
during transmission to the
underside of the double-
sided PC board where it
fonns an air-insulated trough-
line between the PC board
and the diecast box. Grant-
ed, there would be other
ways to improve the im-
pedance bump that this
arrangement produces, but
it is no worse than the aver-
age swr indicator.
I plan to eventually dedi-
cate an MGF-1400 CaAsFET
to the MRF-901's role, but it
did provide a wealth of ex-
perience in rf amplifier de-
sign at a low cost. The orig-
inal circuit (Fig. 2) proved
to be extremely unstable,
even with several changes
of transistors, and the cir-
cuit of Fig. 3 eventually
evolved. It was much easier
to tame while still providing
usable gain. The instability
is a function of the device
and only means that the
MRF-901 is really a poor
choice for a 2-meter rf
preamp. Anyone who would
like to check out that state-
ment is referred to an article
by B. H. Krauss WA2GFP, in
the December, 1981, issue
of QEX.
Construction
The circuit is mounted in-
side a diecast metal box ap-
proximately 45'' x 2.5'' X
y (Hammond 1590B). Input
and output connectors
shown are SO-239, but BNC-
or N-types are easily substi-
tuted. A fine saw is used to
cut a slit in the center pin of
the connector in order to
mount the fixed contactor
(salvaged from a 5-Amp
DPDT relay). The saw
blades are available from
X-acto® and can be found
in any hobby or hardware
store.
The feedthrough connec-
tors are an item I picked up
in a flea market and are
1
ca — 1
I 1
1 '
J2
1 ^
LI
4T0
L Jl
cr
l-io
/7>
/rf
*00
/77
Ifb
(sOOpF SOOpF)
,01
330
100
H *• -i/VV — 9-^ *■
JM400fl
SOLENOID
^"^ ] -^
:.oi
Lr -ei #20 !l/4iiT. DIA. kSm. L0PH5
fn
35V
TANT
LM3J7
£70
fff
SOOpF
I
-*»+£4V
m m
5SV
TAMTALUM
f /g. 2. The original circuit diagram. The MRF-901 proved to
be very unstable in this configuration.
I COM tC-730
AM Of These "Goodies" And Many More At Super Savings.
Come See Us Or Call 1-800-241-2027.
Bret's 2-Way Radio
Sales & Service
2508 Atfanta Street
Smyrna, Georgia 30080
Belmont Hills Shopping Center
(404) 432-8006
Music City Ham Shacic
413 S. Gallatin Road
Madison, Tennessee 37115
(615) 865-21 89
F & IVI Electronics
3520 Rockingham Road
Greensboro, North Carolina 27407
(91 9) 299-3437
73 Magazine • April, 1934 87
LI
1
HRF-SOl
I
I
1
42
I ^^Cf >7*(r f 1'
SO0»F
)
/w
rtz
/^
IFB
^ ^
:.of
iOLEMOID
I Fa
E
r^
(
soopr
*24V
i
soopf)
^
M4
1000
SCT
Vet
+flV
Ul ■ IT LINK #2B t/i in Dl^
La* BT *£0 1/4 m, DIA. l/£i(» LONG TAP J TURN
L3' ST #20 k« In. 0\A, J/?lfi. LON& TAP | TUflN
CI - tOp-^ PIS'TOIM TFIIIMMER
C2»i-l2pF CERAMIC TRlMWEfl
FB>FEnmT£ BEAD
JI,j2»S0-2J^ COAX COMNECTOB
R2, n4 •^QXV TO SK^ELEt
^
TA«T
LMStT
270
; +
JW
■10
lev
TANT
r
TANtfli,U(M
Fig, 3. The //na/ circuit that was used in this version. It is rea-
sonably stable once the initial tune-up is completed. It is
much more narrow-banded than the originaL
glass tnsutated. They repre-
sent the only parts that
might have to be specially
fabricated and might be
substituted by using brass
rod epoxied in the center of
brass grommets. These are
available anyplace that
sells sewing supplies. The
silver contacts for the relay
end should be soldered to
the rod before trying to fill
in the epoxy resin. I made
loads of these for feed-
through use years ago, and
they can be made by stick-
ing the rod into a wax block
(paraffin canner's wax), cen*
tering the grommet and fill-
ing in the center of the
grommet with epoxy on a
small screwdriver blade.
The PC board is mount*
ed on a pair of brass rails
that act as guides during
the mechanical shifting. A
springy piece of finger stock
maintains a good ground
contact on the underside of
the PC board during opera-
tion. Teflon® blocks are at-
tached to the side rails and
are used to hold the PC
board- Any method that will
pennit good electrical con-
tact with freedom of motion
should suffice.
The solenoid used rs a
Ledex #12180133-REV A. It
just surfaced in the junk box;
hov^ever ft is possible to
modify any screw-mounted
solenoid to perform the task
of pushing the PC board into
its preamp position. There is
sufficient spring tension to
return the PC board to the
neutral, or transmit, position
when power is removed from
the solenoid Radio Shack is
currently selling a 12-volt
solenoid that should be
usable.
A final construction tip is
to drill and tap a hole on the
end of the diecast box that
will allow you to run a VS-20
screw into the shielding to
manually switch the pre-
amp to receive position
during tune-up.
I would not recommend
trying to use the Hammond
box out in the weather. It is
not waterproof, and the sol-
enoid, having a steel anna-
ture, will probably rust and
freeze up if used where it
can get wet The whofe as-
sembly should be packaged
inside a weatherproof en-
closure of metal or plastic if
it is mounted at the anten-
na. ■
r/
f y
^
v^^^
SATiUIII CONTROl CMLI
3 TYPES AVAILABLE! 11
AVAILABLE
IN 250*500 1000
FT. ROLLS
OR BY THE FOOT
TYPE 1
(General Purposd)
1 — RG59/U96%
Copper Braid
5@ 22'Gauge
2@ 22*Gauge
Shielded plus
Tinned Copper
Drain Wire
2@ 18-Gauge
TYPE 2
(MTI)
1 — RG59/U96%
Copper Braid
2@ 12-Gauge
3 @ 18-Gauge
3® aO-Gauge
Stiielded plus
Tinned Copper
Drain Wire
22*Gauge Shielded
plus Tinned Copper
Drain Wire
TYPE 3
(IntersaU
-RG59/U96%
Copper Braid
@ 12 Gauge
@ 18'Gauge
@ 22'Gauge
Shielded plus
Ttnned Copper
Drain Wire
Designed for easy, one-step installation^ providing the
required cables for most earth station equipment ... all
in a direct burial jacket.
Only Nema! offers the quality construction RG59/U
copper shieldmg made to mil spec JAN 0-17, 12-gauge
conductors, tinned copper drain wires, and a true direct
burial jacket.
• COMPLETE
MULTlCONDUGTOR
LINE
* PRICING
AVAILABLE FOR
ALL QUANTITIES
NEMAL ElECTRONICS, INC.
12240 N.E. 14th AVE., NO. MIAMI, FL 33161 ^''
Telephone: (305) 893-3924
* Also available: Complete line of coaxial and multi-conductor
cables, top-quality connectors and SMATV equipment Cables to meet
FflANCHISED DISTRIBUTOR KINGS CONNECTORS AUTHORIZED AMPHENOL PlSTRieUTOR ^^e£QuiftEMEN^^^
* Cati or write tor compete dealer pricing
• WE'LL e£ GLAD TO
CUT ANY OF OUR
88 73 Magazine * Aprii, 1984
I
NO RADIAL
Ttie B3 half wavelenglh design eliminates the
nd rftdial system requlr&d by other ver
Heals. Optimum cytrent dtstribytion gives
ore efficiency and law angle radiation tor DX
ommunlcations*
R3 brings high performance antenna features
to those living in apartments, condominiums
or on smalt city lots. £ven if you have plenty of
space, R3*s combination of neat appearance
and DX capability make it Ideal for your sta-
tion. The R3 Includes an integral turner to give
a perfect match across 10, 15, and 20 meters.
The remote tuning feature allows easy finger-
tip control as you operate your station.
R3 is a comptete antenna system ready to in-
stall In virtually any location from ground level
to roof top.
FEATURES
3 dB Gain, ref V^Awhlp
No Radials
360° Coverage
integral Tuner with
Remote Control Console and Indicator
24 Volts To Tuner
110 Of 220 Volt Operation
75 ft (22.9m) Control Cable Included
Only 22ft (6.7m) High
1 sq ft C09 sq m) Space
Self Supporting
Stainless Steel Hardware
Mount: Sleeve Type Fits Pipe Up To
1¥* ln(4.5Gm)dia
Can Be Easily Stored and Set Up For
Porta bie or Temporary Operation
Add up the features— you *tt find that you can
have ALL OF THIS PERFORMANCE without
the need to buy tower, rotator and associated
hardware. H9 IS MHOTHEn f^ROOUCT
CHEATED fOn THE ENJOYMENT Of tOUR
HOBBY BY THE WOULD HEHOWHED
CUSHCRMFT ENQIHBEBmQ OemON TEAM.
t^iAt
CORPORATION
4
THE ANTENNA COMPANY
48 Perimeter Road, PO. Box 4680
Manchester. NH 03108 USA i
TELEPHONE 603-627-7877
TEL£X 953-050 CUSHSIG MAN ^
AVAILABLE THROUGH DEALERS WORLDWIDE j
^Stf0 Usi of A^twemsers on pag^ t30
73 Magazine • April, 1984 89
Hl-Q BALUN
For dipoles. yagis. inverted
vees and doubtets
Replaces center insulator
Puts power in arttennd
Bfoadbanded 3-40 MHz.
Smatt, lightweight and
weatherproof
1:1 Impedance ratto
Fof fiill legal power and more
Helps eliminate TVl
With SO 239 connector
Buift-in DC ground helps
protect against iightning
Only $14.95
D*
•J
^
Hl-Q
Paiun
Hl-Q ANTENNA CENTER INSULATOR
9^^
m
f^^F
Small, rugged, light-
weight, weatherproof
Replaces center insulator
Handles full legal power
and mofe
With SO 239 connector
$6.95
THE ALL-BANDER DIPOLE
^^
THE E>EHFECT MATCH rOft
ANTf NNA TUNERS WITH
A Bjt^LANCED OUTPUT
Comptelely factory assembled ready to use
Heavy 14 {7/22J gauge stranded copper antenna
wire to survive those severe storms
Center fed with 1CK) feel of fow loss PVC covered
450 ohm balanced transmission line
mciudes center ifisuJator with arr eye hook for
center support
Includes custom molded insutators molded ot top
quality material with hsgti dielectric qualiMes and
excellent wealherability
Complete installation instructions included
Overall length 135 feet, less when erected as an
inverted vee or sloper
Handles 2 kw PEP & covers 160 through 10 meters
May be trimmed to fit small city iots
Only $29.95
DIPOLES
MODEL
BANDS
LEHGTH
PBiCE
DipoJes
0-80
BQ/75
13Q
S31,9S
D40
40nS
66
mm
E>20
20
33
27^
o-ts
15
22
26 95
D to
ia
16'
25.95
Shortened dipolts
SD80
80/75
90*
35 95
SD-40
40
45*
33.95
Parallel dipoles
PD-eoio
80.40,20.10/15
130'
43.95
PD-4010
40.20.10/15
66'
37,95
PD-e04Q
80.40/15
130'
39,95
PD'402O
40,20/15
66'
33,95
Dipole shorieners
S-80
— only, same as
inaluded in
SD models
80^75
$13,95/pr.
S-40
40
12,95/Df
All aniennas are complete with a HI Q Balun, No. 14 antenna
A te. insulators. 100' nylon antenna sypporl fope (SO models
cfijy 50 ), rated tor tuil legal power Antennas may be used as
an inverted V and may atso be used by MARS of SWLs.
Antenna acces»ori«s — available wiih antenna ordefs
Nylon guy rope. 450 lb. lest. 100 f^ei &4.4g
Mo I ded Dog t>ofie T y p e a n te nn a « n sula t of s 1 . OOf pr .
SO-239 coa ic con n ec tor s .55
No. 14 7/22 Slianded t^ard drawn CQpper antenna wire ,0&1t
ALL PRICES ARE UPS PAID CONHNffJtAL USA
MvBifatitB at vow tBvartfw ulster ^r Qf^er direct ffof*^
Van Gorden Engineering
P.O. Box 21305 * South Euclid. Ohio 44121
O^aler Inquiries InvJIed
EVERYTHING
TOR THE /
fast Dd\very\
LISTENER! T
^w j^ Jf^^^p *■ i*J|^5jL ^^j^^^
SHORTWAVE RECEIVERS
SCANNERS
LOW PRICES
PREAMPLIFIERS
ANTENNAS AND COAX
YOUR ORDER SHIPPED
WITHIN 24 HOURS!
TUNERS
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INC
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....AND MORE!
111 Wt
140 Dog Branch Road
Brasstown, NC 28902
704-837-9200
CALL TODAY FOR YOUR FREE CATALOG!
Toll-free 1-800-438-8155 -^
TRiONYX fNC MANUFACTURER OF ELECTRONJC TEST
I COMPLETE SYSTEMS
BUILT ANTENNA
AND VARIA6LE TUNER
OPERATES ON TV
CHANNELS 2 THRU 6
O
$59.95
m
O
o
O
I
3
m
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ALL SYSTEMS INCLUDES DETAILED INSTRUCTiON
DOWN CONVERTER
BOARD & PARTS KIT
9.95
** MICROWAVE
CO
ANTENNA KIT....
$9.95
E^DOWN CONV KIT,„.. S9.95
gpOWER SUPPLY KIT S9.95
.. S6.95
^CASINET
O
.q#V^»A'4Hkl *'»*■■
$36.80
VARIABLE POWER SUPPLY
BOARD & PARTS KIT
9.95
o
O
C
%
2
to
ALUMINUM CABINET
ALL HOLES PRE -PUNCHED ^
$6.95 9
t(0
ALL RG59 U COAX CABLES ^
COME WITH CONNECTOR
ATTACHED
100 FT _
75 FT„.
50 FT ...
Si 5.95
$13.95
3 FT „ ..S2.50
O
Q
lONUKiLc
6219 COFFMAN RD.
INDIANAPOLISt in 46268
•^W PHONE OR MAIL
(317) 291 7280
291 2995
ViSA
O
Q ADD £3,50 FOR SHtPPmO
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00 73 Magazine • April, 1984
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INTERNATIONAL
Each month, 73 brings you
ham radio news from around the
world in this cotfectton of re-
ports from our foreign corre-
spondents, we present the lat-
est news in OX, contests, and
events, as weti as keep you
abreast of tfm technicai
achievements of hams in other
countries.
if you would tike to contribute
to your country's column, write
to your country*s correspondent
or to 73; Amateur Radio's
Tectinicai Journal, Pine Street,
Peterborough NH 03458, USA,
Attn: Jack Burnett.
AUSTRALIA
Jtm Joyce VKSYJ
44 Wren Sfra^
Afipna 3019, Victoria
Ansffsim
It has been cJ aimed that r>o tvw rvatioa's
pMpie are mom ai4Ka kn all «ay& than Aua-
tialians and New Zeainndora- Coosfdeftng
our (xxTtmon haritaQe, it Is «>ot surprising
Iftal there *efe mo^o* tn ihe late 19CX)s lo
m^e N^w Zi&aland anotNar slate of Austm-
Ha, but tf>e plans were eventually dropped
Wfelh Hew Zealand bemg cioser to the
aastem states of Au&tralia than our own
Wes! AustraHan cHy Of Forth and with, up
Ljntl4 latety, no travel restrictions between
our two countries (e.g., passports, healthi
certiftcatas, etc.), It Is no wonder we have a
unique relationship with our Kiwi {as we
eafllhefn} nelyhborm.
Wtttt ttie In miral the ai^nual VKZL-
Oe^ania oontest Itas a special sJgnirteanoe
10 JMth of us in further cefhentihg our ciose
relationship ^a amatetir radtai Sponaofed
toiFTtly t3y ttie WlA and NZART on alterna-
tive years, ttiis oonleBt aims at attracting
ovefseas participation looking for contacts
In those areas.
This year there should be a good change
of picking up e rare one with Warrick
ZLilAFi-t from Kermadec, If he gets the time
with his work load— and also if he gels his
amateur gear fixed. At the present time, he
is waiting fof an aJr drop of either another
rtg or parts to rapiir his own gear. Warrick
also has beeri hrnrd using oofnmerdal
maitna goar, operating oti both 40 and 80
meters, the fnequencifls being 3074^38^
and 7774.
David VKOCK la operating from Mac-
quafie istand^; with an SL^det} bonus of a ^it-
fheter beac^on In operation from this loca-
tion, VKiJGL should be active from Mawson
with an interest in both HF and VHF.
I cannot guarantee that these stations
will be on frequency during this contest^ but
with most of the South Pacific is^lands hav>
ing at least one or two Australian or New
Zeiaiand antaieurs aa residerits, the chance
ol picking up a new <xifi is quite QOOsL
This contest is tieid on tiie ffrst and third
weekends in Oclober each year, w^th phone
on Iho iirst weeMnd and CW Ofi the thinj.
92 73 hSagazine * April, 1984
The contest lasts for the full 43 hours each
weekend.
We in VK have lately beefi given exterv
sions to our frequenclea of operation, two
of whioh should be of interes-t to DX opera-
tors^ cofisideilng the downturn In the sun^
spot cycle. We now can opo'atA on 40 me-
ters from 7000 to 7300, ar\a we have a DX
window of 3795 to 3800 ort 80 meiers.
When listening, please don't fofget that
Our Novice operators can operate only on
10 meters up lo 28600, on 15 meters up to
21 2O0, and 60 motors up to 3825, With only
30 Waits PEP output allowod, you wilt
have to f listen real hard to hear them, with
the bend conditions of late.
Any queries regarding VK contests In
the 1981-1954 period should be directed
to our Federal Awards Manager. Reg
Dwyer VK1BR, PO Bok £36, Jamison, Aus-
tralian Capital Terrilory 2614, Australia.
Good luck In the contest!
BRAZIL
Gefson Ris$in PYlAPS
POBojf 1277B, Copac^bana
20000 fiio ^9 Janeifo, fU
Brazil
RR SYMPOSIUM
Sponsored by the Brazilian Amateur
Radio League (LABRE) and the National
Telecommunications Department (PEN-
TEL), the symposium was held in the city
of POflO Alegre, the first such trying to
sol we RFl problems between the radio op-
erators and the sound listeners, The most
important factories of sound equlpmeni
in Brazil were represented, among them,
Ptiilco/Hitachi, Sharp, Telefunken, Sanyo,
anKl Evadin.
Accordir^} to Brazilian iaws, the partlcJ-
pania igrMd that Ri^i should always tie
oonsidered as due to the sound equip-
ment, and all complaints must be met by
the (aciofies. Thla decision made the
radio operators happy, and it was a big
step toward solving also ttie TV I p>roblem,
wt^n sometimes It is due to the TV maiUH
facturers.
WOf^LO CDMMUNICAnONS
YEAR STAMP
To commemorate World Communica-
lions Year, the Brazilian Post issued a
special stamp. A must for collectors, the
stamp shows the domestic Srazillan
seteJIite and is printed In offset, In blue
and orange over phiosphorescent gummed
paper. If you are interested in the special
stamp, you may request il from: Divisao
Central Filateli{;a, Edificio^Sede, EOT,
SBN. Coniunto 3. Bloco A, 20^ aiidar,
?D0Q2 Brasilia, DF, Brazil.
144-MH; E^PEDOIOm
During the last weekend of Juno. 1964|
will be neid the Third 144'MI-I2 Expedi-
tions, an event which brings together Bra-
xlilan operators fnteresied in propagation
ejtporiences on the two-meter band. The
expedltloners reach the top of the higher
hills with their equipment— generetors,
antenna arrays, etc., doing their tiest to
make long-distance QSQs. Last year, Irt
spite of poor weatrier conditions, more
thaii 1,500 l^ig^istar»c« QSOs were
made tay aoout fifty expedltiofiers.
DMS AWARD
Sponsored by IJ^BRE in l!>e state of
Mato Grosso do Sut, the QMS Award is
available to all licensed amateurs for con-
firmed contacts with PT9 stations as
follow^: South American countries: 10
contacts; other countries; 6 contactSn
DSOs must have been made after Febru-
ary 2; 1978, on any amateur band and any
mode. No QSLs; send GCR list of PT9 sla^
tions worked (call, dale. time, band, mode,
and report) and 15 IRCs fof mailing eit^
penses to DMS Managar, PO Box 08,
79100 Campo Grande, MS. Brazil.
SAO PAULO A/Z AWARD
Sponsored by the Brazilian Amateur
Radio League of ttve Stale of Sao Paulo
CLABRE-SP), the Sao Paulo Ml Award is
available to ail licensed amateurs for con-
firmed contacts with 28 stations located
In the state of Sao Paulo {PY2} which have
all 26 different letters, conside/ing on-
ly the last letter of each call. Example:
PV2XXA, PY2XXB. .P¥2AAy, PY3A6Z
Contacts must have tseen made attet
August t, 1977, on any amateur band. On*
iy two-way C^ mode. No QSLs- send GCR
list of stations worked (call, tfate, time,
band, mode, and report) and 15 tRCs for
mailing exper^ses to lABRE-SAQ PAULO,
GBTS&n PY1APS and hrs wife, mritft PY1XBT, s/fd tfmit twin daugArers. NstAShs and
Tatisna.
Diretoria de Cor^ursos e Diplomas, PO
Box 22. 01000 Sao Paulo, SP. Brazil.
I 1 ^^^
FRANCE
Claude GueeFIDGY '
f1 Rua Emiia L^bicha
28100 Dreux
France
FRENCH USTENERS (FE)
For two years new Frafich SWLs have
not been receivir»g official licenses. As a
matter of fact, before tfie CB legalization
and during the big growth of CB, many
CBers asked for ttiis FE call (free of
chargeh this way getting the official OK
for their antennas^ Neict year, it Is likely
they will be issued again, nevertheless
with, probably, two alterations: an annual
charge (why not!), and no official OK for
an antenna. So, till tn«n, don't be afraid to
receive so^ne French SWL OSLs with calls
like R£F. URC. Of eventually, FEM. instead
0( the official FE, In fact there are prov*-
aiofml '*calfs" issued by different ham
associations tassociation code numbefaji
7(K:M 3 and
In 1984, a new band plan will be used for
a maritime radio-navigation system called
Syledis. Frenct^ hams living near coasts
and harbors are rather worried; I hey have
to share the 430- 434 -MHz pad exactly in
the new UHF repeater's band. Some years
ago» this pari was unused. Fortunately.
Sytedis is known as a very excellent sya-
tem. and QRM could be weak. Well wait
and see...
COLUMBIM. ST&g. W5LFU AMD
EUROPEAN SPAQELAS
For this eveni, the French broadcast
station Europe t, thanks to its scientific
reporter Alt»en Ducrocq, had the bright
idea to light up the Greer>wlch meridian
(and also partly the Paris meridian) when
I he shuttle crossed this I ine, for the begin-
ning of this mission. This was done with
hundreds of headlights along about a
180-mile line! The center (La Fieche air-
port) was marked by a fiery cross, Thanks
to ciear skies, the shuttle's passengers
should have seen this winking!
WSL^L was fteard by many hams here.,
ifid many fioped to receive the first space
EXPEDtTION fItlMORS IN 1S>84
FD Ciipperton with W and F08 hams,
and YVO.
SOME FRENCH OVERSEAS AWARDS
The usual conditions apply to these
awards. Sent certified iog extracts onty.
QSLS are not required.
1) PO: Tahiti— b contacts with fOB sta-
lloos; fee: 12 iBCs; manager RkjIo Club
Oceanien. BP 374 Papeete.
2^ FK: Nou¥aiia Ca/edanie— 8 contacf s
with FKS stations; fee: 12 IRCs; managin
Guy Francois FK8DH. Villa 55 Toot out a.
3) FP: Saint Pierre Bt Miqi/efon—lwo
classes: phone. 3 contacts with FP sta
tions, and CW, 2 contacts with FP sia-
tions; fee: 3 IRCs; contact after January 1^
1981. manager: Henry Ufltte FP8HL, BP
1 107. 975O0 St, Pierre et Miquelon,
4) FY: Guy anna— B contacis with F¥
stations; fee Is ^ IRCs; manager: Christian
Lolt FY7AN. Cite Rebard. BP 746. 97305
Cayenne. (Note: in Fref>ch Guiana there is
a 50,035^Hz beacon call: FY7THF (100
Watts, GP aniennaj; Send reports lo
FY7AZ, BP toot Cayenne.]!
5j Diploma de& Ameriques Fran-
caisfrs— CertltJed contacts (after January
1, 1966J with 2 FPSs, 2 FG7s, 2 FY7s. and 1
FM7 or FS7; tor Asian or Oceanian stA-
ttons, Ofiiy of\6 (Qfitac! i^ r^uifed; Fee: ItO
inCs, manager A1«k D^meuies VE2AFC,
2SZ5 1^ Flech« Sainte Foy. Quebec G1V
Ijg, Canada.
^1^
^P^
GREAT BRITAIN
Jeff M^ynara G4EJA
W Ctiurchfiefds
Widnes WAS 9RP
Cheshire
England
THE UK SCENE
8y the time you read thia. the night of
W5LFL in CQfumbfa wiil be some months
old and wlli have entered the reaim of ham
folKlore, However, aa I write this piece, the
shutiia has barely landed and I guess the
comptrters are still warm.
You might be wandering wtiy 1 hiave
choean even to men i ton the project krvow-
tng it will iae so long before this is ^n print, t
am <k>iDg ao becauea I feel that thefe is a
lesson to be learned and a message to be
refmated ioydly to all hams. The message
^s, of coiifse. do not Is! us have another
ham in ^pace.
Please donl give up readin^j in diSQuel
at this poini, thinking I am a head-in-the-
^^and n'lefchanl against progress and in-
novattofi. Fa? from it; I do like to see new
act i VI lies, new ventures, and new lech-
no^OQ^. I also think ihe entire shuttle pro-
gram is a msfvfltous tribute to American
technologlcai krtow-how. and W5LFL ts
my new hero.
Why then, the antipathy towards any
lurlher auch missions? Well, this ts targe-
ty because. I am sorry to say. WSLFL's trip
brought out a side of amateur radio I
wouJd not wish to see again, i will explain
this, but flrit some backgrounds
There has been keen fnterest in the
United Kingdom In the ham-lnspace pro-
gram since II was first mooted about
some time ago. When r^ASA gave tenta-
tive approval there was considerable ac-
livtty. The RSGB magazine. na<fio Com-
munication, Qu thread the proposals as did
the AMSATAiK newsletter. O&car News.
With ttie shuttle flight quite dose.
Radio Communication featured a long ar-
tlc*e {^scribrng the proposed operating
method and sugg«stirij| likely times of
One 0/ the test entennas^
spscec/aK visl^bMity in the UK. Oscat
News featured more detailed information
on the orbital parameters expected. As
the time of taunch drew closer, the Sun^
day morntng news bulletins from RSGB
(on 2 meters and 60 meters} gave very
comprehensive coverage of the final
plans for operating and the expected
launch program, AMSAT-UK nets on 80m
and on OSCAR 10 talked of itttle else but
the shuttle program^ and much time was
spent swa|>ping orbital prediction pro-
grams and planning strategy.
Ttve R&GB set up a telephone-answ^M-
Irlig m^cNne giving up-to-theHminyte infcM-
mation. (So popular was this, that I ended
up cailir^g WestUrA In Califorma a^tef try-
ing unsuccessfully for two days to get
through to RSGB.) The Sunday morning
newscasts became daily, with bulletins
each evening at 1 700 iocal 1 1 me on 80m for
the duration of the mission. AMSAT-UK of
course was having a ffeid day with nets
and special news sheets (even Radio
Communication for December carried a
loose insert with the latest orbital predic-
tions).
So you would eiCpect everyone to know
what to expect and to know what to do, 1
was active for five ot the projected over-
passes of the UK- l did not hear W&l^U
but I did hear enouph to susi>ect that he
woutd not wish to have had any QSOs with
UK stations. Firsts there were the i^ds who
oanu read, c^idn't read, or Just did not be
lleve what they were given by the f^SGB.
Galling on the downlink was the favorite
of course — even l>y some GSs wh^se call-
Signs indicate that they have held a II-
coitse for at Jeast 15 years {and are pre-
AumNably. therefore, of mature years).
lids a 1513 invented their own brand of
bTi'sfi shorty snappy calls to minimize up-
Itnk occupancy: CQ CQ CQ W5LfL—a.f¥l
CO CQ CQ Oolumb^a, and €0 CQ CO Ca4-
timbia. Wis is Gei^? i^tting from Puddfe-
hampton in. . . ali of which was enough to
occupy ttie entire pass, ryever mind the
one-minute listening period. Mind you,
stations were heard catling Co/4/mNt up
to one tiour before the computed (and
much ptibticrzed) AOS tirne^.
One couid^ perhaps, forgive the atM^e-
mentione«l operators for just enthusiasm.
But what of the foHowing —
• running RTTY (RYs) on one of the uplink
frequencies
• publiciy stating thai 146.550 (the down>
lln4c) ia for everybody's use, and csiilng CO
• responding with foul language to a po>
lite request to move from the downlink fre-
quency
• telling listeners that the mission Is "all-
ly" end threatening to jam If heard
e boasting of running enough power to
drown every other UK station
I might have heard more, hut I gave up
tisten^ng. I did no! think hams anywhere
could behave so badly, but to hear it in En-
gland was very sad.
I salute the shuttle program and Or. Gar^
flott, but please don^ givei him a fig again.
IE
GREECE
Manas Darkadakis SV7IW
FO 00* 23051
Ath&ns mw
Gt&ece
With AMSATs new tslrd, OSCAR 10, the
need for a good UHF antenna ia a must for
some body who wants to work wlih li. So,
many amateurs in Greece, after I he suc-
cessful departure of the satellite, were
thinkmg of what antenna Ihey should put
on. Since Greece doesnl otfer many
choices for buying goods like that, many
of us make our own antennas, bul there
STB r>ot suitable instruments to test them.
So, one day while on a round table on a
lOCftf ehaiinei on two meters, SV1PH
pfoml&ed to bring a very accurate pOw#
meter in order to test ttie homemade an^
t
i#/r 10 right: SVfOE, SVlfU, SV1E}C. SV1IW, SVIDM, amS SVfHM.
Left to rtghf (sTantSfng}: SV1DS, SVIDH, SV7DC, 5VtAH, SV7R/, andSVlRC; SifuaWog:
SV1BL SVTOf, SVfRL and SVliW.
73 Magazine • Aprils 1984 93
tonnas along wttti some commafclal
ones. too.
The antertoa party was orfpnizdd *wy
fwM^ and aixHil tofi days latef on » beauli-
ftit Sunday moming* more than 25< 5V
hams were gatherad in Spat a. a place
some 10 mi las east ot Athens. This place
i9 a verY lar^e area Iree from obslacles of
any kind, as Ihe new Internal lonal Airport
of Athens will be th^re,
In the transmitting position, an FT 7ftOR
UHF transceiver was put with a 23-81-
emeni Fracaro anrenna on a 2(^rciot ntasr.
On ttie other end. 200 feet apart, the HP-
432 A power meter was ready with all the
antennas ur^<d«r lest.
' The measur ement $ for Ihe ant ennas drft
In Rg. 1 Note Ihai all of them were put cm
a similar 20-foot mast just hhe the trartS'
mittir>g anienna. As you can see. tof soine
of the home-brewers things are not an
easy, while on the other har^d a few have
made very ^ocxj copies of some popuim
antennas such as the Jaybeam Para-
beam,
Finally, besides all ot these measure-
ments^ it was a very pieasant Sunday
morning; the weather helped a lot for
at>oij! 25 people to meet and have fun
playing amateur radiol
Antenfwi
Id^lemerrt F9FT
2T-elemefit F9FT
fia-tiemenl Jayt>eam'3 Mtillitwvn
1&e4emenl Quagi (homemade fii>m SVlRt)
17-elemen| Parabeam (t^orrventade from
SV1RCJ
19-eleniBnt F9FT (homemade from SVILY)
23-elemenl Fracaro
13-element K2fllW (homemade from SV1LY)
Clifn
Front
Front
lianufac>
totedi
to side
tumr'*
L
R
gain
ia.r
22
ts
15
le
14
20
17
12
IS
15,2
21
11
13
18J
10j5
4
n
14
15
125
15
11
13
14J
8.6
23
22
22
IB
SM
2G
22
22
—
B3
17
13
t3
^—
Fig. t
ISRAEL
Ron Gang 4Z4MK
Kibbutz Urim
N^gev Mobif» Post Office
aS^^O /free/
THi MASADA EXPiOmON
**Masada? You'll never be able to gel a
signal out from il^e^e down tsry the Dead
That was the kind of reaction received
by Dani 4Z4GU and Adam 4XeiY when
they tet it be known (hat they were orga-
nizing an amateiir-radio expedition to thts
aiHiient forlfess.
The e^ent— the 19^3 Scouts' Interrw-
tionai JamtMxee On The Air, the place—
Masada, a tortress dating back to the time
of Chrtat situated on a rock plateau
overlooking the Dead Sea, the lowest spot
on ttie face of tfie Earth. Dani end Adam,
leading six membefs of tfw Tel Aviv Sea
Scoyts" radio Club, ventured out to this
forebod'fng spo^ sel up 4Z4HS/Masada,
and dispelled toe once and for all the mytfi
that Ihis area la an rf trap!
A few words abnul the histmy of Ma-
sada; Situated In the parched Judaean
desert, hovering 1,4^ feet over the Dead
5ea^ stand the remains of this stronghold
built by King Herod around the ^ear zero.
Containing vast food stores and a ctever-
ly-engineered system of drainage canals
and cisterns to catch every valuable rairv
drop, King Herod designed this pEace to
tie both his wintsf palace and a ptace of
rafuge from nis many en^nies, both rea]
and imagined. Perched on top of sheef
roek ditf Jt was easily defensibie.
A few generations later, with the Jewish
rebellion against the Rornan Empire, Ma^
sada was the site of ttie last stand of the
Zealots. Jeruaalem fell to the legions ol
Emperor Titus in 70 AD, and Masada's de-
fenders hefd oul under siege lor Ihiree
more years. Painstakingly building e mas-
sive embankment up to the top of the pi a*
teau, the Romans were able to brin^ their
catapults and ba tiering rams to the walls
of Masada. When they reached the top
and entefed, they found Itiat tfw defend-
ers had taken their own fiv^ rather tfian
tall into captivity. This closed the last
chapter of Israel's mdependence In arv
dent times
Today, Masada has become a kir^J of
nalmnal shrine. EKcavated by arGheolo^
gists, many ol Its ruins have been recc>n«
strutted to give an idea of what It was
once II Ke, A few years ago, a cable car was
ins tat led to ease the visitor's aacent up
the rock face.
Armed with a T5<S30, gasolme genera-
tor, storage battery, a twenty-foot mast
and assorted di poles* the group trom the
Sea Scouts rnade their way from Te* Aviv
to the Dead Sea m the Great Bift Valley.
Unloading the g«ar from the cable car, the
?7»e Tet Atflr Sea Scot/fs on tfm if §83 Scouts' ffttwnatkmaf Jamboree Cvt The Air. at llaaatfa, overfookfng the Dead Sea. (Photos by Dan Sfmhrn 4Z4QU.)
04 73 Magazine • April, 1984
Owen Garriott Will Be At The ARRL National
ni Whi I lniini[TAV/1li
COME TO THE HOTEL PENTA IN NEW YORK on July 20 22, 1984,
for the ARRL National. Register now for the special convention room
rate of S56.00 per couple, per night, and along with the convention's
fantastic parties, technical and operating seminars, League com-
mittee meetings^ banquet, DX gatherings and nrianufacturers'
disptays, you and your family can enjoy all there is to do in
New Vori<, the cultural capital of the world!
FOR A TRULY »OUT OF THIS WORLD" EXPERIENCE weD be
celebrating both the 15th Anniversary of man's first moon landing
AND the first off -world amateur radio operation during the STS-9
Spacelab-1 mission. Our special guest will be astronaut DR. OWEN
GARRIOTT, W5LFL, first ham to operate from space! You can meet
W5LFL in person, at the Moon Landing Anniversary Party on Friday
evening^ July 20th^ AND hear him speak at the Banquet on Saturday
evening, July 21 st.
IMACINE, THE MOST IMPORTANT ARRL NATIONAL EVER
HELD... AND YOU CAN BE THERE! Register now to assure your
room and banquet reservatrons. For detailed information and
registration forms, SASE to Mike Troy, AJl J, R.R. 4-Box 19C,
Pound Ridge, NY 10576. ^^^^
HARC
m&^'
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73 Magazine • April, 1984 95
setting up of trie station went without a
fittch and it looked like clear sailing
»hea<L
Suddenly a sandsiorrn b4ew iFp frofn tfm
Juda^an d^^rt The scouts wete forced
10 mtreat intq a focijnstructed bulldir>§,
arvd when they got back on the air they
found that they w«fie in wftat ha^d once
been King Herod's bedrodml
The tweftty-metef ttajid wat in ^xxi
itMpe and good, c^ea/ signal a were pour-
log in from Europe and Africa, with weaker
ones being heard from Oceania and the
Aniericaa. In tfie finest tradition of the
Jambofee On The Air, Dan I and Adam's
SGouls were making contact with their
counterparts around the world, exchang-
ing their names and ages, f^any pages of
the log were filled, and the group fait the
voniure to be a huge success,
Masada will t>e on the sir again! Oani
has Invited me to a similar expedition he
Is ptvining with the Sea Scouts. So, in Qc-
tober, 1984, keep ymjr sar? open for
4X4HS^3£ada?
JAPAN
Roy Waits W9PQN
Tomig&ya Grani:t-$Oh 2-1^-5 Tomigaya
Shibi/ya-Ka
Tokyo 157
QUESTIONS MOSTOFTEH
ASKED ABOUT JAPA^*
Throughout ttte years as a resident h&re
in Ja{?an. i have been asked rrmny ques-
tiOAs about ham radio in trii$ countiy.
such as regulations. statistic:aJ informa-
tion, eic^K as well as many nort^Tajtwe-
tatad items. Here are some of the most-of-
tafvasked questior^s along with the aiv
awers, which I thought migm be interest-
ing. This also might possibiy be savirtg of
my time so that I don't have to answer the
same quest lens mere than onceT
0/ Wd* many Jepa/iese hsms sr&
tfiGre?
A: There are 1,080.000 operators and
576,000 stations at the present time.
0, Why this ^iffer&nt& b^iwe^n Qpem-
ton anrf stations?
At In Japan, iht ofMvator's license
(good for life} and the statioo license ^
years) are separate.
0: it fooks like a lot of Ofmratof^ cfonY
ftav9» station. RJght?
A; Righi. Many aie high-school and unk
ver»ity students who cofifirtpa ttieir operat-
ing to the school club statioft arfd have
rvevnr applied for their own station li-
censes. Also. In Japan son>e farnllles have
i '1 amity club calls ign;* which aU f amity
members with an operator's permit may
use. Another factor Is that since the oper-
ator's license is lifetime, the big numt>6r
doesn't reflect those who hav^ lost Inter-
est In ham radio.
O: StrtQ^ there a/e so m&ny hams in Ja-
pan, i am ^urprisac^ that ttte DX CaHbook
fists so few. Why is that?
fie Simply t)ecause r^ one has taken the
time lo translate the Japanese callt»Do4;
Into English. tT>e Japanese calls and ad-
dress^ listed tn itw American DX Csif-
bO0k have apparently either tM«n sent in
by thii Japanese ham himselt or sent In by
an American ham frfand Incidentally, the
Japanese ham call book Is enormous— as
you woulis expect. It contains l fiOO pages,
weighs over 4 pourvds, and costs approx-
imately S27,00. And, as stated at>ove, It la
Sfitlraiy in Japanesa.
0: tarn a US cftfien pianning to be in Ja-
pan for a month. Can I operate?
96 73 Magazine • April, 1984
A: As of the date of this writing there is
no reciprocal agreement yet, but you
couJd postHlly operate a dub slatiorL The
problem is that it takes from two weeks to
a rrKHTtth to obtain pefmission to operate,
assuming that you firxt a cluti willing to
lend you its callsign. The Tokyo interna-
tJonat Amateur Radk» Association (TlAnA)i
might t>e able to help you. Just call 5SS-
2236 alter you arrive in Japan.
0: ts repeater op^atian parmitted tit
Japan?
A: Yes, on 435 and 144 MHz, sinca ^^&Z
0: How attout phone patcha$?
A; Not allowed.
Q: How about fax. ftTTY, and sfow-scan
TV?
A; Yes, they are allowed.
0: What are the power iimitationa?
A: The two Novice classes are limited to
10 Watts output; Second class Is tOO
Watts: and First class generally Is 500
Watts arifK>ugh Rrst class is actually
Opon-ervied, applications being consid-
sfsd on a case-by-case basis. For in-
stance, I kfKvw of one Japariesa ham wtio
runs 13 kW lefiaily. In Japanctse law, no
distirkction la made between amateur and
commercial regulations. The power limits
gi^en above appiy to (he HF bands. On
VHF and higher, the limitation is SO Watts
output,
Q; / undarstanif that the Japanese have
another code in addition tQ th^ Morse
coda.
A; Yes, It Is called "wabun" and bs one
of the requirements to obtain a first-class
licensa. When a Japanese operator lis-
tens to wabun he writes down Japanese
tetters on the paper, not English. When
you first listen to wabun it sounds like or-
dinary Morse until you come to some
""new" characters— I tke four dashes, for
Instinct.
Q; Has any Arnerfcan ewf pa99ad tfm
Jmpan»B€ amgt^ur-radio test?
A: As tar as ts known, no non-Japanese
has ever sat for the First-lass exam,
which would include a wal?un exam But
on the other hand, several Americans and
others have passed the "denwaKyu" or
Novice no-code exam. We believe that the
first non^apanese ham to pass the Japa-
nese Novice test was Nor mart Smith
G3HF0 In 1970 while he was working for
the British embassy here In Tokyo. Since
that time several Americans hav^e taken
and passed the test, and more recently a
Mew Ze a lander, Keith Wilk^nsbn ZL2BJR.
passed the Second-cFass tast^ Definitely
a first!
O: So f assume that tttose who paas the
t9St can get a catisign amt goontha air.
A; No. ttwy cannot 3 At this wfiting. only
Japanese citizens can feceive a station li-
cer^e am) caftsign. Pass I r^ the test gives
ofve only an operaior's ttc^nsa. which you
could obtain by showing your ham license
from your own courtt ry If you happen to be
American, German, Irish, or Fmnlsh. ^So
why bother with the Japanese test?] You
still need to find a club station to operate.
But that may all be behind us by the time
you read this, as we soon may have a full
reciprocal agreement with Japan.
Q: it is pretty weii i^rrown that the Japa-
rrese aro ganerai/y iaw-a tiding c^fkens,
so Pasad on that in format ton t wouttf as-
some that IherB are not many viaiatians
with tegat^ to amateur-mdio op^ratofs in
Japan, is that right?
A: Tt\ere are sonw probiems^ I am told
(fiai many First-class operators apply fof
tow power to escape a station inspect Ion,
then operate with 2 kW or moce. Also,
thete la a lot of repeater Jamming. 13ellber^
ate Jamming, apparently. Also, we often
observe out of -band operation on the
40-meter band, which seems to be deliber-
ate as the opefators use fake or comical
call signs. The percentage of bad apples Is
probably very low, but the repeater lam-
ming has really gotten out of hand. We are
told ttiat English-speaking hams are spe*
dal targets for these |ammers. This
seems to tw tru6^ We also have hMfd
siftgtng. dirty talk, and sex tapes on 2 me-
tefs from time to lirrte. (Some people civeer
them on.) then, too, ther« was a p€obiefn
when Owen Garrlott orbitted this part of
Ihe wo#td, t>ringing the iammefs oul In
force. Japanese country -style enka"
music was heard on one of the downlink
frequencies, ruining it for everyone, ft was
a lot of fun. Generally, Japanese hams
have a good reputation on the DX bands
and are known for their good manners and
good operating techniques^
O.' Who i^ the presideni of the JARL?
A: Shozo Ha ra JA1AM Is the president
of the JAAL He Is 57 years old and has
been JARL president lor 14 years.
O; Can f save money by tx/ying a rig in
Jap&n and fringing it home?
A: Yes, If you hand<arry it with you. Bui
be sure the rig you buy f^as an English
manual, Itiat the warranty is good In your
country back hnm*, tMt It has taps for
110/120 volts, and in the case of a 2-met«r
rig. thai It covers the entire band and not
fust 144 arvd 145 f Japan fr«quenci«d)^ fncJ-
dentally, since the compantes want to •
lot of tfouble to set up dealerships in the
US and other countries, thay prefer that
you buy In your own country through
those deaiers.
Q: i'd Ki^e to stay in a Japanese inn,
catied "ryoHan," In Tokyo, Can you recom^
mend one to m&?
A: We're not Iri the travel business, and
since we live here we don't need to look
for a ryokan in Tokyo to stay in, tnit I un^
derstand thefe are some inns in Tokyo
that caief to toreignefs. T?ie information
clee4c at the N«w Toicyo Inteniatlonal Air^
port can provide you with tnformatioa In-
ctdentally^ the Japanese twt t>aihs are
very good fof arttuitis sufferers like my-
self. Outside of Tokyo at the various m-
softs you can Find many beautiful inns
that you might anfoy. Generally, supper
and bfeakfast are included in the price,
which ranges from S40 to S3D0 a night, per
person I
0: fs Engiish understood widaiy in Ja-
pan?
A: No, not really. You wlU have no prob-
lems at international hotels and restaur
rants, but outside of that youVe on your
own.
Or What Qfm ptttce of advice woufd you
gh/e to a person coming to Japan as a
t^H/rist^
A. Bring large bucKets of money I Prh»s
are high hersv
LIBERIA
Brother Dona rd Steft^s, C- S^ C-
BL2AUWB8HFY
Brothers of the Hoiy Cross
St Patrick High &choat
POBoxIQQS
Monrovia
f^pabiic Qt Uberta
How wou^d you like to know aJI t^ ama-
teurs in the United States?
Welt, In Uberla ihe amateurs all know
each other. When a new call is heard on
the ajr, all iht hams want to know wtio he
is^ wtiere f>e llves^ wtiene he came from,
and what he is doing In Uberia, It Is not urv
like many small communities in the
States. There Is one exception, though.
Here the new amateur is always welcome
and any doubts will be erased on his first
contact
The country, Efom Its northwestern tip
lo its southeailwty point, runs about
three hundred miles, and It is alx>ut tr>e
same diagonally from southwest to norlh-
^st. But in araa^ the country, roughly rec-
tartguiai, is t^ite a bit smaller. Ut>eria Is
dJvkfsd into nine cotfnties. Ttie most
densely populated is Montserrado tEL2) in
which ts found Monrovia, the capital city
and the greater part of the Rrestor^ Rub-
ber Fiantation. More than half of the hams
In Liberia operate from Montsefrado
County, so many of the amateur operators
around the world get the idea that Liberia
ts EL2 land. Moai of the radio amateurs In
Liberia are expatriates, and In the Monro*
via area most of them are either American
or German. The Americans are associated
with the embassy, with the Voice of /^ner-
lea. or with ttie administrative offices of
vanot^ Ameiican government activities.
Also, a number of Americans are engaged
tn fioapita] and dispensary work and in od-
ucatlon. Thie Germans, for the most part,
are engineers,
Ntmba County fELS) has seven ama-
teurs and all Of ifiem are missionaries.
Bong County {£L7> has four amateurs.
They are engineers operating an irorwjre
mine. Grand Gape 1EL9) has four amateurs
who are mlssLonarles Grand Basse {ELi)
had two One of them has left, so In that
county the count Is down to one. Sinoe
{EL3^ has none. Maryland County (EL4)
has one. Lofa County (ELS) has four.
Grand Gedah ^ELB) has one, and all of
these are missionaries.
Some of the missionaries up and down
Ubena use comdmafcial-type flxed-tre^
quency radios lor ihei^ tnisine^s commu-
nications and use tt« amateur radio to
ke«p in toucn with theJr fiiends both in U^
beria and In their hametancfs. Commune
cation in this country is difficult or nonex^
Istervi except fo^ the radio, in the outlying
areas there is eitf>er no electrical poorer at
all or it is supplied for a few hours a day.
Radios in those areas are operated on bat-
tery power.
The problem of building amateuf radio
among the natives becomes mora under-
standable^ The missionaries must supply
the Instrjctibn and the equipment, other-
wise little is going to happen in this area.
Area club stations seem to be the answer
and It is In this direction that present ef-
forts are going.
It would be an Intei^estlng project to
contact all the amateurs in Uberia. There
are less than a hundred. Perhaps one of
these years, tfie LHAA (Liberia Radio Ama*
teur Assocfation) will Issue an award for
such an aocompllshrrkent. Wouldn't it be
nice to have a beautiful caftificate on the
wall of your shack statirfg that you have
contacted every ham in Liberia^
MExrco
Mark K, Toutfiart XEtKMT
Aparladb Postal 42-048
06470
Mexico^ D.F-
NEW tOMFti TO 3M FM UNK!
t was recently informed by William Al-
zaga Ch. XE2WAU here in MeitJco City,
that a new link from 10m FM to 2m FM la
b^ing irkstalled and used thmugh tl>e Sat^
el lite Radio Qlub repeater (147.030/
147.630) so that locaf hams can operate
Continued on page 153
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73 Magazine • April, 1984 97
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73 Magazine • Aprfl, 1984 99
David A. Smith W8YZ
530 Holiywood Drive
Monroe Ml 48W1
How to Have a
Sunny Field Day
When Michigan hams turned to solar power, they got more
than they asked for. Does success mean anything?
Our club. The Monroe
County Radio Com-
munications Association, has
always earned the natu-
ral-power bonus points at
Field Day by hand-cranking
a generator and using the
power produced to operate
a 5-Watt CW QRP rig. Be-
lieve me, it takes real con-
centration on the handles
when the operator keys
down to adjust the antenna
tuner.
Well, to a radio ham who
is always looking for a better
way to improve a station, it
seemed that there had to be
a better way to earn the bo-
nus points. 1 had seen a dem-
Battery box, charge controller, and sohr panel with (from left
to right) Paul DeNapoli WD8AHO, lee Loose KD8DA, Dave
Smith W8YZ, and Ron Loveland KA8RNE.
100 73 Magazine • April, 1984
onstration of photovoltaic
power at a local hamfest
and it sure seemed like a
better way to go.
We contacted Mr. Paul
DeNapoli WD8AHO, the
Communications Director
for The En con Corporation
(27600 Schoolcraft Road, Li-
vonia Ml 48150, [31 3^523-
1850). Paul was glad for the
opportunity to demonstrate
his company's products. To
our surprise, he told us to
plan on running at least one
solid-state rig of the 200^
Watt class for the entire pe-
riod on equipment that he
would loan us for demon-
stration purposes. We ex-
pected only to run a hand-
held on 2 meters for five
contacts*
We took Paul at his word.
One of our members sup-
plied an I com IC-740 for the
project This station was to
be operated on both 80-me-
ter phone and CW with ca-
pability for other bands as
well We planned to use it
around the clock.
The equipment provided
by Encon was four Exide re-
newable-energy, deep-cycle,
6-volt batteries connected in
series parallel, 12 V dc @
370-Ah storage, an Encon
charge controller, and three
Encon solar panels each
measuring 17 by 42 inches.
The latter were mounted on
an aluminum framework
and pointed south under
Paul's direction. We expect-
ed to need to rotate the
framework to follow the
sun, but Paul explained that
this was not needed.
We started Field-Day op-
eration using the mad-scram-
ble technique which permits
27 hours of operation The
solar installation proved to
be easier to set up than a gas
generator, Paul brought the
whole installation to our site
in the back of a compact au-
tomobile. All that was need-
ed was to make several
connections to the rig and
batteries with #10 copper
wire and aim the panels
south.
We were quickly able to
make the needed 5 contacts
for the natural-power bonus
points, Everything was work-
ing fine and we continued to
operate the station full bore
on both phone and CW.
The charge controller sui>
plied by Encon had a battery
voltnneter as well as a sepa-
rate charge and discharge
ammeter The voltage re-
mained at a steady 13.4
volts white the charge indi-
cator indicated between 1
and 6 Amperes to charge.
This was due to the periodic
cloud coverage. Under full
sun, we had 6.6 Amps. The
output ammeter fluctuated
wildly between 1 and 20
Amperes while we were op-
erating!
The station was on the air
all night and of course there
was no charge current to
the batteries. The voltage
dropped to 12,6 volts. Thfs
was quickly recovered, how-
ever, with the batteries top-
ping off at full charge by 10
am. The charging current
from the panel array was 6,6
Amperes.
It became clear at this
point that the three panels
and batteries were large
enough to run at least one
more rig. We had failed to
consider how low the full-
current duty cycle is with
solid-state amateur gear,
even during a contest
Considering the advan-
tages of solar power for
Field Day, one must think
beyond multipliers and bo-
nus points- For example,
there were a couple of times
when the solar station was
the only station operating,
once because of a break-
down of a generator when a
spark plug fouled and an-
other time when there was a
fuel-line blockage. It was
clear that the solar installa-
tion is far superior for
emergency applications. Al-
so, there was no ignition
noise to contend with when
the generator failed. The
"ears'' on the solar station
got even better.
This demonstration of am-
ateur radio was well covered
t^Sse List of Aiivertfsers on page 1$0
by the press with all area
papers giving it attention.
The county's general-cov-
erage paper, The Monroe
Evening News, did a half-
page photo story on our
Field Day with particular
emphasis on the solar-power
aspect This publicity got a
lot of attention for our hob-
by and provided many op-
portunities for the club
members to explain to their
friends the hobby with its
unique emergency capa-
bilities.
One response is most in-
teresting. The local power
company contacted the
club and offered to ''do
whatever is needed/' in-
cluding setting poles and
transformers free of charge
and providing free power,
for any future field activities
of the club. They wish to em-
phasize the dependability of
commercial power.
In Michigan, users pay a
penalty for "excess use" of
electricity. Consumption be-
yond 810 kwh is charged at a
rate of 14? a kwh. This
means that any optional use
of electricity such as am-
ateur radio must be consid-
ered to cost the penalty rate.
Nearly every ham I know
has a part of his electrical
consumption in the "excess"
category; any home applica-
tion of photovoltaics must
take into account ham oper-
ating at the penalty rate
Also, hams who are es-
pecially interested in emer-
gency preparedness would
do well to'' consider the
potential of photovoltaic
power for their home sta-
tions. After all, a widespread
outage of commercial pow-
er would have no effect on
an operational photovoltaic
system, while the demands
upon a ham who was need-
ed to send health and wel-
fare traffic might well in-
clude cleaning spark plugs
and gas lines of infrequently
used equipment before the
traffic could be sent Clear-
ly, there is an advantage in
using something that works
every day of the year, ■
View of charge controller and battery box.
.3
70
V SW R LESS THAM 1 .5:1
CONTROL LEADS «
f YEAR WARRAMrr •
CONTACT i
PANO 8CH. Fl.. 3»660
aOS-TSS'-tOlQa TLX ei43&9
X .■: : A'
liHiHiiiili
73 Magazme * April, 1984 101
L B. Cebtk W4RNi
5105 Hohton Hilk Road
Knoxvitte TN 37914
Painless Op-Amp Filter Design
Custom applications can be easy, just follow this
step-by-step guide to a perfect triple op^mp filter.
The triple op-amp audio
fitter has become a stan-
dard, not only in amateur
circles but in commercial
design as well Easy to de-
sign and nearly foolproof in
construction, the various
configurations of this filter
have found their way into a
large percentage of existing
ham shacks, either hidden
within a transceiver or sit-
ting on the speaker as an
audio adjunct. Numerous
small companies offer post-
receiver audio units using
from one to eight f i Iter units.
Even though popular; op-
amp filters seem to confuse
most ham builders. Despite
the low cost of parts, few
hams build their own. A sim-
ple but effective single filter
with a bandpass of between
100 and 200 Hertz would
cost about $1000 for parts,
excluding the case and pow-
er supply, which together
might double the cost. This
is a small investment in
selectivity, considering what
one might learn in the pro-
cess. Still, there are few
takers.
Part of the problem stems
from the volume of material
that has been written about
triple op-amp filters. There
are at least three semi<lis-
tinct configurations of these
filters, but only two dif-
ferent models. However, be-
cause designers recast sche-
matic diagrams in different
ways, the average ham
comes to believe there may
be dozens of models. Going
even further, different
designers choose different
circuit values without ex-
plaining their choices: the
variations seem to grow
without limit and without
any clear sense. The avail-
able books on filter design
uri
mire the ham builder in the-
oretical design math while
simultaneously claiming
simplicity. There is some
necessary malh to designing
a personally -satisfying triple
op-amp filter, but it is
straightforward hand-calcu-
lator stuff.
For the CW buff, most of
the existing designs have
limitations. Many are fixed-
frequency units allowing no
tuning to please the ear. The
units that permit tuning tend
to cover 300 to over 3000
Hz, a fine range for the 5SB
fan who can use high- and
lowisass capabilities built
into the filter, but ex-
traneous for CW. A filter
that covers a span ranging
from 300 to 400 Hz at the
bottom to perhaps 1200 Hz
at the top would reach two
goals. First, the filter would
cover the main receiver
passband for CW, which
runs (depending upon pref-
erence) from 400 to 800 Hz
wide. Second, the filter
would spread its narrower
tuning range across the filter
frequency dial, permitting
the operator to find more
easily the desired signal.
Unfortunately, most home-
brew designers have merely
guessed their way into a
tuning range.
There is a very direct and
easy-toTollow procedure for
designing triple op-amp fil-
ters in the ham shack. Not
only will the procedure en-
sure a filter that works, but
also it will allow the builder
to refine the filter's tuning
range to his desires. The fol-
lowing notes present a pro*
cedure used to design sever-
al dozens of different filters
for experimental, evalua-
tive, and operational use,
and those who have tried
the procedure claim they
mrw
Eq^IT
Fig. 1. The t^sic bi-quad fitter.
102 73 Magazine • AprlM984
Fig. 2 A basic state-variable filter (--SVf).
have finally made a filter
that works and that they
like. The procedyre even in-
cludes steps that show how
to let a hand calculator do
most of the work.
Some Op-Amp Basics
There are many triple op-
amp filter designs but only
two fairly distinct types. Un-
fortunately, the history of
op-amp filter terminology
has obscured the subject
Originally, the mathemati-
cal methods of designing fil-
ters gave rise to the name
"bi-quad" as a label for all
designs. Newer derivations
yielded the name "state-
variable fitter/' For some,
these names refer only to
the design methods; for oth-
ers, they refer to circuit con-
figurations. At the risk of
arousing the wrath of some
professional designers, let's
follow the latter course.
The bi<]uad (or B-Q) ap*
pears in Fig. 1. Note that the
input op amp is an in-
tegrator; as is the third op
amp. (Theory aside, an in-
tegrator circuit is little more
than an op amp whose feed-
back is provided by a
capacitor rather than a
resistor.) The middle op amp
is an inverter, and we take
our bandpass output from
this stage. Feedback from
the first and third stages is
fed back to the first stage in-
put By controlling the
amount of feedback from
one of these stages, the first,
we control both the gain and
the Q or selectivity of the
filter. The components
marked RF1, CF1, RF2, and
CF2 control the frequency
of the filter.
Fig. 2 shows the other tri-
ple op-amp filter design. The
state-variable filter (or
— SVF, with the minus sign
to be explained very soon)
also consists of two inte-
grators, but this time in posi-
tions two and three, with a
summing amplifier as the in-
put stage. Feedback from
the integrators combines
with the input signal at the
inverting or negative input
of the first op amp We con-
trol the gain and Q of the
filter by the ratio of resistors
R4 and R5, and we set the
frequency by the compo-
nents marked to correspond
to those in the B-Q filter.
Bandpass output comes
from the middle stage, this
time an integrator Unlike
the B<3 filter, the -SVF
design provides high^ass
and low-pass outputs, but at
different signal levels than
the bandpass output.
The -SVF filter has a
near tw in which we can call
the +SVF. Fig. 3 shows the
configuration. The major
difference between the
SVFs is that this version
feeds the input signal to the
non-inverting or positive in-
put of the summing op amp.
(The reason for the labels
+ SVF and -SVF should
now be clear J Gain and Q
feedback also return to this
pin, now being controlled by
the ratio of R4 to R1.
Although this filter belongs
in the SVF family, some of
its components require
slightly different values
from its brother, and the
gain vs. Q characteristics
will differ. Otherwise, it
works perfectly well.
The B-Q and SVF filters
have different properties
that, for various needs
around the shack, give one
advantages over the other
First, both SVF filters will
have a constant Q and gain
throughout their tuning
ranges. This means that the
bandwidth, when measured
in Hertz, will increase as the
filter frequency increases. In
contrast, the B<J filter has a
constant bandwidth in Hertz,
but consequently increases
in Q and gain with frequen-
cy. For fixed-frequency
filters, this phenomenon is
meaningless, but for tunable
filters, it is important The
constant output of the SVF
designs makes follow-up
amplification simple. How-
ever, every SVF section [i.e.,
three op-amp filter) requires
a dual potentiometer to
change RFl and RF2 to-
gether.
The B-Q filter is tunable in
the same way but may also
be tuned by changing just
RFl Since, like virtually all
other filter sections, these
filters will ring if the Q is
very high, we can cascade
two lower Q B-Q sections
for a sharper bandpass using
only one dual pot. Dual pots
are hard enough to find;
four-section pots in audio
(log) taper are nearly impos-
sible to come by, being
either inaccessible or very
expensive (which amounts
to the same thing for most
of us). A newer variety of op
amp, the operational trans-
conductance amplifier
(OTA), promises to relieve
us of these problems, but
few practical ham designs
using the device have yet to
appear.
Notice that there is no
clear winner in the contest
between the B-Q and the
SVF filters. Rather, we must
design around their limita-
tions. For example, we can
overcome the gain change
of the B-Q filter by making
the Q resistor, R4, variable,
or by following the filter
with a limiting amplifier
such as the one in Fig. 4 This
is the W4MLE variable-com-
pression version of the
N6WA Audio Elixir (See 73
for September, 1979, p. 116.
and November, 1982, p. 32.)
Until OTAs become more
common, there is no way to
solve the multiple-pot prob-
lem of cascaded SVFs; how-
ever, for most work on CW;
a single-section, moderate<J
filter requiring just one dual
pot Will do wonders. A Q of
20 theoretically yields a
half-power bandwidth of
just 30 Hz at WO-Hz center
frequency. Even allowing
for low-precision compo-
nents, we do not need exces-
sively high Q filters to en-
hance CW. In practice, de-
sign Qs in the range of 1 5 to
20 will yield -6 dB (half-
voltage) band widths in the
lOO-tO'120+lz range for a
600-Hz center frequency.
Designing Your Filter
In Fig. 1 through Fig. 3,
components having com-
parable duties have the
same designation. For all de-
signs, the frequency -deter-
mining components are the
same although differently
placed. R2 and R3 provide
feedback and can be treated
as alike in all three cases. In
the —SVF design, R1 equals
the feedback resistors, while
in the +SVF version, it will
be half their value. In the
B-Q, the input resistor can
equal the feedback resistors
iw • — v^ ■
EiOyT
COliPfES3M3li L£Vf L
*f OUTPUT LCVEL
01- ZN3^8»9 OR EQUIV
Fig. 3. A basic state-variable filter (+ SVF}
Fig. 4. A limiter/compressor tor postfilter amplifying.
73 Magazine • Aprti, 1934 103
^1
Filter Type
State-Variabid
Inverting Input
State-Variable
Non^lnveiiing Input
Bi-Quad
Schematic
Fig. 2
Fig. 3
Fig.1
Frequency
F^ = 1/2piRA
Fc = 1i2piRA
Fc = 1/2piRjCf
Frequency'determining
resistors
RF1=RF2
RF1=:RF2
RF1=RF2
Frequency-determining
capacitors
CF1 = CF2
CF1 = CF2
CF1 = CF2
Bias resistors
R1 - R2 - R3
R2 = R3 = 2R1
R1 = R2 = R3
Q-determining resistors
R4-R5{3Q-1)
R4 = R1(2Q-1)
R4 = R1Q
Q
Q = (R4 + R5)/3R5
Q = (R4 + R1)/2R1
Q=R4/R1
Gam (A^ = B^^^^IE^^)
A,-Q
A^ = 2Q
A, = Q
Non-inverting input
bias resistors
N/A
Fig. 6, Norton amplifier
configuration only
m = R5 = 2Rf
N/A
Fig. 5. A comparison of filter design relationships.
orvary sonnewhatfronn their
value according to the
needs of the Q relationship.
Only in the — SVF design
does Q leave the input resis-
tor unaffected, being deter-
nr^ined by the relationship
between R4 and R5. In the
other designs, the input re-
sistor will be a con^promise
(if needed) between the dic-
tates of Q and the desired
situation of having the input
resistor correctly related to
the feedback resistors.
This discussion may make
designing a filter appear dif-
ficult. In fact, design is quite
easy if done according to a
straightforward procedure.
Taken step by step, the pro-
cedure almost ensures satis-
fying success. Let's start
with some basic relation-
ships, as shown in Fig. 5.
This table reveals where
the differences between de-
signs will occur Calculating
R4 will be slightly different
for each case. Notice that
the +SVF filter has twice
the gain of the other de-
signs for a given Q. This may
or may not be an advantage.
For a filter inserted between
the detector and audio am-
plifier of a receiver, the dou-
bled gain with a low-leVel
input can be useful. For
post-receiver use with nor-
mal speaker input to the
filter, the lower gain of the
— SVF and B-Q designs may
be more than we need In all
cases, we should have a
means of varying the input
level.
Aside from these points,
design of the three-filter ver-
sions will be nearly identi-
cal. The first step is to think
about the ICs we will Use.
The LM324 is perhaps stan-
dard for both single- and
dual-voltage supply applica-
tions. Its current require-
ments are relatively small
and it is easy to handle. The
TL084 is an FET input ver-
sion with an identical pin-
out; its current requirements
are even less. The 3900 Nor-
ton amplifier also is popular
in single-voltage designs,
but its biasing is different
Fig. 6 shows the basic con-
figuration of the +SVF
design with Norton biasing.
Notice the additional for-
mula that sets the values of
P Rl
OL>T
the bias resistors to the non-
inverting positive op-amp in-
puts. Otherwise, our work
will be the same as for
regular op amps.
Much of the available lit-
erature on filters is still writ-
ten in terms of the relatively
high current 741 op amp.
Hence, about the highest
value shown for feedback
resistors is 10k. in fact, 10k
should be about the mini-
mum value for Rl, R2, and
R3. Something approaching
100k is more appropriate, al-
though we will not freeze
that value at this point. In-
stead, we will start by select-
ing an op amp and the de-
sired frequency range.
This differs from textbook
procedures, but for good
reasons. First, the ham
builder ordinarily has access
to components with 5% or
10% tolerances rather than
the 1 % and .1% tolerances
commercial designers pre-
fer. Consequently, absolute
peak performance from
ham models of op-amp fil-
ters is not possible. Very
good performance is possi-
ble and practical. Since we
will aim at good though
imperfect performance, we
can take a few liberties with
absolute precision at some
points to gain better preci-
sion at points more impor-
tant to hams.
Second, one of the most
evident shortcomings of
home-brew filter designs is
the fact that tuning controls
for frequency and Q rarely
cover the most desirable
ranges. The techniques for
designing filters are easy,
but almost never described.
Third, the current crop of
op amps available for fil-
ter work is very forgiving
when we compare the pre-
cise operating level to over-
all filter performance.
Hence, we can set our own
priorities when establishing
a design procedure. In fact,
feel free to modify the fol-
lowing procedure to suit
personal needs and desires.
While the procedure in-
volves twelve individual
steps, they cover only three
areas of concern: setting the
frequency or tuning range of
the filter, ensuring correct
feedback, and setting the se-
lectivity and gain of the fil-
ter. With a few reservations
noted in the procedure steps,
these are almost indepen-
dent design operations. To
make the procedure more
thoroughly clear, let's step
through it, working an exam-
ple as we go along.
Twelve-Step Filter Design
Step 1. Select an op amp.
Effj« — v^Ai-^4
iC\. ICa. [C3-3/4 LM3900
° EQUt
/f7
Fig. 6. A +SVF filter using the 3900 Norton amplifier.
104 73 Magazine * April, 19S4
Fig. 7. Setting up the 324 for filter design.
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73 Magazine * April, 1904 105
In this case, let's use the re-
liable LM324,
Step 2. Select a circuit.
We can start with the — SVF
of Fig. 2 and later see what
happens when we convert
the design to the other cir-
cuits.
Si^p 3. Choose a power
supply^ In this example, we
have chosen a single 12-volt
source. This forces us to pro-
vide a voltage divider to
feed the positive input lines
that we would directly
ground if we used a dual
supply Fig. 7 shows the ba-
sic configuration of our cir-
cuit, with the 324 pins and
power connections drawn in
Step 4. Choose a frequen-
cy range For CW, let's try
300 to 1200 Hz,
Step 5. Find the center fre-
quency, F^. This is our first
calculation. Let k be the ra-
tio of the highest (Fhi) and
lowest (F|p) frequencies of
our chosen range. Then:
k =Fhi/F|o = 1200/300 = 4.
The square root of k is 2
(and let's call this ks). If we
have not made a mistake,
then Fc = FhAs = F|oks =
1200/2 = 300 X 2 = 600 Hz.
This is the design center
of our filter. Since the filter
is tunable, let's next turn to
the task of being sure it
tunes exactly the range we
want it to tune.
Step 6. Choose a dual pot
to tune the filter. This is a
practical decision. Since we
have already said that we
would like to keep the feed-
back resistors well above
10k and hopefully near
100k, a dual 500k pot would
be nice. Dual 100k audio-ta-
per pots may be more acces-
sible, so let's see what hap-
pens if we use this value.
Sfep 7. Calculate Rh, and
Rjo. !n order to limit the tun-
ing range to specific values
(e.g., 300 to 1 200 Hz), we will
need a fixed resistor and a
pot in series to make up each
of the trequencv<ontrolling
resistors. Rkj will be the need-
ed resistance when the fre-
quency is the lowest, and Rio
will be the resistance at the
highest frequency.
We know something
106 73 Magazine • Aprn,1984
about these values, even
though we have not yet se-
lected a capacitor. First, we
know that their difference
will be 100k, the value of the
pot. Hence, Rhi^Rb^^OOk.
We also know that Rhi =
4R|q, since the ratio of low
to high frequency is 4:1,
(Note: If we hold the capaci-
tance constant, as we will
do with a fixed-value unit,
the frequency and resis-
tance will vary inversely
with each other, i.e., Fhi/Fjo
Knowing the two relation-
ships between the highest
and lowest resistances lets
us substitute and solve for
Rlo Since the ratio of the re-
sistances is 4:1, then Rhr^
4R|o. In the difference for-
mula, we now can say that
^Rb-Rlo^lOOk, or 3R|o =
100k. Dividing 100k by 3, we
get Rio = 33Jk, Since the
highest resistance is 100k
higher, Rf^j = 133 3k As a
check, we can use the other
original formula and let R^, =
4Rio^4x333k = 1332k
I have carried out the cal-
culation to more precision
than we can possibly get
with real components to
show how good the method
is. In fact, since real pots are
often shy of 100k by as
much as 10%, it is wise to
have a pot in hand before
working out a design The
decimal places might get
long, but rounding to the
nearest whole number for
resistors and keeping k and
ks to no more than two deci-
mal places will give perfect-
ly good design accuracy
We now know the fixed
series resistor for RF1 and
RF2 will be 33k. with the
look pot making up the rest
of the resistance. If we dis-
cover that our dual pot does
not track and can determine
by how much it is off, we
might make one of the two
fitted resistors a 50k trimmer
pot. (Adjustment of trim-
mers in the frequency<leter-
mining circuits of a filter is
best done with the circuit
wired but the op amp out of
its socket, using a precise
ohmmeter. Accurate adjust-
ment with the circuit in
operation requires a scope
with frequency-scanning ca-
pability. Output-level read-
ings taken on an ac; audio
voltmeter can be mis-
leading.)
Step 8. Calculate capaci-
tors CF1 and CF2. At all fre-
quencies, the resistance will
equal the capacitive reac-
tance. Hence, the standard
formula for calculating ca-
pacitance from frequency
and reactance becomes CF1
= CF2-1/2piFRt. In this
case, start with either end of
the tuning range For the ex-
ample, use 300 Hz, where
the resistance is 133k. If
your calculator has a 1/X
key, you can just multiply
all the denominator num-
bers together and then hit
the inverse key. The answer
is likely to appear in expo-
nential notation. For exam-
ple, Cf = 1/(2 X 3.14 X 300 X
133,0001= 3.99X10''.
We need to convert this
to either microfarads (10*^
or picofarads (10'^T to see
what capacitors we should
purchase 3990-pF or 04^JF
capacitors will do the job.
We can parallel some 5%
polystyrene capacitors to hit
4000 pF fairly closely. Given
the fact that we can rarely
buy the exact value that the
formula says we need, we
should design the frequency
range of the filter with an ex-
tra 5% on either end to
allow for the slight range
shift our approximations
will produce.
We can check our work
by calculating the two fre*
quency-determining capaci-
tors from the other end of
the range. This time, Cf — 1/
(2X3.14X1200X33,000) =
4,02 XI 0"', or about 4000 pF
again Because we used pi to
only two decimal places and
dropped the last 300 Ohms
off the resistance values, the
answers diverge by about
1%, well within the 5%
component tolerance. Note
that had we used the 500k
pot we considered at the be-
ginning of the example, our
capacitors would be about
one-fifth the present value.
Some builders have difficul-
ty obtaining 5% capacitors
in the higher values and may
want to use Ihe larger pot in
order to combine it with ca-
pacitors in the 800-pF range
Step 9. Calculate the resis-
tance at the center frequen-
cy, ^c- Since the resistance
at center frequency will
equal the reactive capaci-
tance, Rfc-1/2piFcCf = 1/
(2X3.14X600X4X10"') =
66,348 Ohms. This is the re-
sistance value of the fre-
quency-determining resis-
tors at the design center of
the fitter. We will use this
figure in a very broad way to
determine the remaining re-
sistors in the filter Most fil-
ter-design manuals scale a
filter from an initial assump-
tion of equal value resistors
throughout as much of the
design as possible On this
assumption, R1 through R3
should equal the center-fre-
quency resistance, and R5
should approximate it, if
possible Similar assump-
tions apply to the other filter
designs, with adjustments
for values that must differ.
In practice, using compo-
nents readily accessible to
amateurs, the assumption is
not very important as long
as filter resistor values fall
within the range that per-
mits the op amps to per-
form well Values from TOk
to look have been used
with no specifically notice-
able change of perfor-
mance. As a rule of thumb,
try to let the feedback resis-
tors fall within a 2 to 1 or 3
to 1 ratio of the center-fre-
quency resistance.
Step 10. Determine the
feedback and input resis-
tors, R1 through R3. On the
basis of the previous calcu-
lation and discussion, 68k
resistors appear to be the
closest value to the calcu-
lated center-frequency re-
sistance. In practice, 100k
resistors do not change the
filter performance. What is
important is to use the
same value for all three.
Since 100k is a nice round
value found in most ham
junk boxes, let's use it No-
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UM of Adwefffsms on page 13€
73 Magazine • April, 1984 107
ft 3
noon
4 ^hM
^
CFI
-41-1
TH
J5k idOK
Trx>
— •£0UT
Fig a A itxed-Q -SVf tUtef.
c IDOK
*E0UT
/ft
^W
Fig. ft A variable^} - SVf filter.
tice that, like many ham
building decisions, the
grounds for our choice have
little relationship to theory.
If our value does not work
for some reason, we have
another value to try.
Step 17. Select a value for
Q and choose the Q-deter-
mining resistors, R4 and R5
Since both resistors affect-
ing Q and gain are indepen-
dent of the input resistor, we
have more latitude in choos-
ing values than with the oth-
er two designs. For CW fil*
ters, there is rarely a need
for a Q greater than 25, and
the range of 10 to 20 will
generally produce sufficient
selectivity without ringing.
For greater selectivity, we
should use identical succes-
sive filters which will give us
a steeper bandwidth curve
and greater ultimate rejec-
tion on unwanted signals, As
a rule of thumb, using 5%
and 10% components, I an-
ticipate that the half-voltage
(—6 dB) bandwidth will ap-
proximate 3Fc/Q' ^bout
50% wider than theory indi-
cates. For the SVF filters,
bandwidth in Hz will vary di-
rectly with frequency. Thus,
if i choose a 100-Hz band*
width for the 600-Hz center
frequency, it will vary from
50 Hz at the 300+1 z end of
the range to 200 Hz at the
1200-Hz upper end of the
tuning range If this band-
width is acceptable, then
Q = 3Fc/BWtc = (3 X 600)/100
=18. Lefs see what hap-
pens if we use this figure.
From the formulas gov-
eming the —SVF filter, R4 =
R5{3Q— 1). For our case,
3Q-1=(3X18)-1=53,
and R4 = 53R5. If we let R4
108 ?3 Magazine * April, 1984
= 100k, then R5 = 53 meg-
ohms; use either 4. /-meg-
ohm or 5.1 -megohm stan-
dard resistor values. In fact,
we can change the values
proportionately by factors
of ten without disrupting fil-
ter performance Values of
10k and 510k work well and
may be easier to find. A rule
of thumb is to let R4 be the
highest easy-to-find value
that permits R5 (or R1 in the
other two designs) to ap-
proach its proper theoretic
relationship to the other re-
sistors. However, other con-
siderations may enter into
the final selection. Fig. 8
shows our completed fixed-
Q design.
One major consideration
is whether we wish to be
able to vary the Q of the fil-
ter and thereby to broaden
or narrow the bandwidth
over some useful range. For
example, we might wish to
have a Q ranging from 10 to
20 for this design At Q =10,
the resistor ratio (3Q^1)
will be 29, and at Q - 20, the
ratio will be 59. Suppose
that we have a 500k pot we
wish to use to vary the Q.
Since we will not vary the Q
to nothing, we will need a se-
ries resistor with the pot to
make up R4 We know that
the value of R4 at Q = 20
will be the series resistor R^
+ 500k, the highest value of
the pot. At Q- 10, R4will be
just R5, the value of the fixed
IN-
i^H
iff
FlLTEft
(SVF Dfi a-Qs
ftl
lOK
series resistor. At the higher
Q, R5=(R5 + 500,000)/59,
while at the lower Q, R5 —
Rs/29, We can solve for the
series resistor by letting RJ
29 =^(R, + 500,0001/59. Cross
multiplying, we get SOR^^
29X500.000, or R^ =
1.450,000/30 = 483.333
Ohms. This is the series resis-
tor to go with the 500k pot
for R4 R5 = R^29 = 483333/
29 = 16,667 Ohms. (As a
check, R5 = (483,333 +
5OO,00Q)/59 = 16.667.) We
can choose a 15k or 18k re-
sistor for R5 and a 470k or
51 Ok resistor for R^ respec-
tively. Exactness will not
matter too much here since
we will tune the control for
best reception rather than
for some specific value of
Q. Fig. 9 displays our com-
pleted variable-Q design.
Step 12. Consider the
gain. This step does not re-
quire special calculations,
but it does bring the matter
of gain to your attention. For
the ^SVF design, gain will
equal Q. If you design a
fixed-Q filter, you can ac-
commodate the filter gain
with preceding and succeed-
ing level controls, as shown
in Fig, 10. Set the input-level
control so that the strongest
signal will not drive the filter
■J I — '^ —
4 -en
spnn
fig. TO. Fiiter input- and
output-!evel controls.
Fig, IT. A simple post4ilter
amplifier for speaker or
phones.
to clipping. A scope will
show this as a sharply flat-
tened sine wave. Since the
voltage gain will be consid-
erable, the filter may drive
the succeeding stage too
hard, causing distortion in
the amplifier feeding the
speaker or phones. We can
kill the unwanted voltage
with another trimmer set to
hold the amplifier relatively
distortionless at full volume.
If the filter has a variable-
Q control, then its gain will
also vary To avoid the need
for constant volume-control
adjustments, the compres-
sion amplifier shown in Fig.
4 should follow the filter
and precede the output am-
plifier. With the values
shown for the compression
circuit, a normal CW signal
will leave the speaker quiet
between dots and dashes.
The circuit needs no input-
setting pot, and the output-
level control serves the
same function as the filter-
output control in Fig. 10.
These 12 steps complete
the design phase of the
work. The next step is to
breadboard a model, verify
its operation, and finally
construct a permanent ver-
sion complete with case and
power source Robbing pow-
ef from the receiver and in-
stalling the filter in either
the receiver cabinet (espe-
cially if inserted between
the detector and audio
stages) or the speaker cabi-
net {along with an audio
amplifier such as the LM386
circuit shown in Fig. 11) is
one popular way to handle
final construction. However,
to avoid cabinet and circuit
modifications, you may
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»^33
Sire List Qf Advertfser^ on page 130
73 Magazine • April, 1964 109
wish to make the filter a self-
contained unit
Additional Procedures —
+ SVF and B^ Designs
The first t'ight steps of the
procedures just outlined are
identical for all three filter
designs. Nothing changes
until Step 10, selection of
the input resistor, where we
have only a minor modifica-
tion for the + SVF fitter. R1
should be half the value of
either R2 or R3 if we wish to
have the relationship of Q
and gain follow the formu-
las given with Fig, 5. Other
ratios are possible, although
the input resistor should not
be greater than the feed-
back resistors. The gain will
change but remain constant
across the tuning range.
Let's look more closely ^t
the final steps of the proce-
dure, customizing them for
each particular design. First,
the bi-quad filter:
Step 11: B-Q. Select a val-
ue for Q, and choose the
Q-determining resistors. In
the B<J design, the input re-
sistor, R1. interacts with R4
to determine Q and gain.
Having selected an input re-
sistor, R4=QR1. Selecting
Q follows the same guide-
lines given for the — SVF de-
sign, with the proviso that Q
will vary across the tuning
range, since bandwidth in
Hertz is constant. Using our
— 6-dB (half -voltage point)
rule of thumb, we can
design with the formula
Q = 3F^/BW, where BW is
the desired bandwidth in
Hertz. If we wish about 100
Hz, then Q = (3 X 600)/100
= 18. RV = 18R1 = 18 X
100k = 18 megohms, a
usable value. However, with
very little change in perfor-
mance, we can reduce both
Rl and R4 as long as we
keep them in the proper
ratio. Fig. 12 shows the full
results of our design work.
We can vary the Q and
consequently the bandpass
of B<J filters. We need only
make R4 variable Suppose
we wish to vary the Q be-
tween about 10 and 20, If Rl
is look, then R4 needs to be
1 megohm for a Q of 1 0 and
2 megohms for a Q of 20,
We can use a one-meg fixed
resistor in series with a one-
meg pot for R4, and the
problem is solved. Fig. 13
shows the changes neces-
sary for variable Q
Step 12: B-Q. Consider the
gain. Variable Q plus the
natural gain variability of
the B-Q filter makes a com-
pression amplifier almost
mandatory. However, the
10040-1 compression capa-
bility of the audio elixir cir-
cuit will more than cover
the situation. The natural
gain variability of a fixed
B-Q filter with the 300-to-
1200-Hz tuning range is
about 4 to 1, while Q vari-
ability expands the total
range to 40 to 1, well within
the amplifier's capabilities
and with room to spare for
audio signal strength vari-
ations.
The B-Q filter has one
special property not shared
by either SVF design. You
can tune the B-Q using only
RF1 , leaving RF2 fixed for Fc-
The variable resistor, how-
ever, will change frequency
only with the square root of
the resistance change,
meaning that the pot will
have to have a much wider
range to cover the chosen
frequency range. Since the
frequency limits in the ex-
ample are 2Fc and Fc/2, the
resistance range must be
Rf J4 and 4Rfc In this design,
Rfc = 66,348 Ohms. The low-
est resistance (for the high-
est frequency) will be
66,348/4=16,587, while the
highest resistance (for the
lowest frequency) will be
66,348X4 = 265392. The
difference is 248,805. A 250k
pot in series with a 15k fixed
resistor will form a satisfac-
tory RF1, An audio taper or
reverse log pot is mandatory
in this application, since
even with a log pot the fre-
quency will compress at one
end of the scale.
In this example, we were
fortunate to wind up with a
required value close to an
existing potentiometer
value. For designing a single
pot B-Q filter from scratch,
we can begin at Step 6,
choosing a pot to tune the
filter Lets select a 500k pot
and see what happens.
Step 7: B-Q, single pot
Calculate Rhi and Riq. Since
frequency will vary as the
square root of resistance
changes, the total resistance
change will be k\ where k is
the frequency ratio. Since
k = 4 (1200/300 Hz), k^==16.
Rhi=16Rio. We also know
that Riii^Rjo + 500k. Now
we can solve for Rjq: 16Rto =
Rjo + 500,000. or R|o =
500,000/15=33,333 Ohms,
This is the value of the fixed-
series resistor. R\^^ — 33,333
+ 500,000 = 533.333 Ohms,
As a check, 533,333/16=^
33,333 Ohms.
The resistance at center
frequency (and fixed fre-
quency-determining resistor
RF2) will be Rh,/4=4R|o =
533,333/4 = 33,333X4 =
133,333 Ohms. We can use
look and 33k resistors in se-
ries or use the nearest stan-
dard value.
Step 8: B*Q, single pot.
Calculate capacitors CF1
and CF2. This calculation
uses the same procedure as
in the —SVF filter. Since re-
sistance and capacitive re-
actance are the same at the
center frequency (and we
must use F^ for this calcula-
tion). Cf^1/2piFcRF2^1/
(2X314X600X133,333) =
1.99X10"* This is about
2000 pF, an obtainable
value in polystyrene ca-
pacitors.
Determine the remaining
values for the filter in the or-
dinary way, 100k feedback
and input resistors appear to
be in order, since they vary
only a little from the value
of RF2. Considerations of Q
and gain will be identical to
those for the dual -pot hi-
quad design. Fig- 14 shows
our new filter.
The SVF fitters always re-
quire dual pots. Therefore,
the only difference between
the -hSVF fitter and the
— SVF design concerns Q
and gain.
Step 11: +SVF. Select a
value for Q, and choose the
Q-determining resistors Q
selection for the -f SVF is
Rl
A
KKW
S3ff lOOlC
RFI
1O0K
"TT
/ff
I5K
I H PiU 1 1
CFl
40D0pF
3h
324 pt^^
5£4
^OUT
lO^F
/ff
114
m m
tf KXDiff
RFl
CF*
4000^
-Jl —
+ I2V
4
:iSK
PIN 4
i ^ PIN fi
m
324
IQ^F
lOOK
4 -VwSr-
113
^
1/4
1Z%
33M 10 OK
^QUT
F/g. 12. A fixed-Q B-Q filter,
110 73M3gBiine • April, 1984
fig. 13, A variabh^i B-Q filter.
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73 Magazine • April, 1964 111
ni
- K>OK
ti2v
HFI
%
ISTI
►-Fifc*
Jfr
^
ftF2
^dUT
;*Q*F
fig. 74. A single-pot tunable variable-Q B-Q filter.
identical to that for the
— SVF design. We must
make mental note that gain
will double Q if we follow
recommended resistor rela-
tionships. Let Q=18. R4 =
R1 t2Q-1). If we use 100k
resistors for feedback, the
R1 is 50k. Many designs use
200k values for R2 and R3, in
whrch case, R1 =100k. Let's
use this latter value for our
design. For a Q of 1 8, 2Q - 1
= 35. and therefore R4 =
100k X 35 = 3,5 megohms.
3.3 megohms would work
welL For a variable Q of, say,
10 to 20, the maximum resis-
tance value of R4 would be
39R1 and the minimum val-
ue would be 19R1, R4 will
range from a series resistor
value of R^ to R^ + pot,
where pot is the potent iom-
eter value we select. Let's
try a 2-megohm pot. Then
R1 =R^19 at low Q and (R5
H-2,0O0,0O0)/39 at high Q.
Solving for R^, we get R5 =
38.000.000/20 = 1.9 meg-
ohms. R4 thus becomes a
1 9-megohm fixed resistor in
series with a 2-megohm pot.
R1 = R4/(2Q - 1 )= 3.9 meg-
ohms/39 =1.9 megohms/1 9 =
100k, a desirable value.
Step 12: +5Vf, Consider
the gain. The gain of this
+ SVF filter, shown in Fig.
1 5. ranges from 20 to 40. de-
pending upon the variable
Q. Again, following this de-
sign with a compression am-
plifier is a must for easy use.
Construction and Results
All of the designs shown
in the examples have been
breadboarded to confirm
that they will work. In fact,
R3
aootc
HZ
ZOOH
Rl
BSK iOOk
CFI
4O0OpF
*i2V
4;^ * ;; tj *p^
WT
m
Fig. 15. A variable-Q -^SVF filter
they all work even when
some non-frequency-de-
termining components vary
by 20% from the design val-
ues, Fig. 16 charts the test re-
sults. (Always test a design
on a breadboard before wir-
ing a final version. If nothing
else, the breadboard tesi
will turn up bad compo-
nents. More important, ad-
justing the design to more
precisely meet your needs is
much simpler on a bread*
board.)
Construction of the final
model can take any form.
Perf board and printed cir-
cuit board peform equally
well Layout is not critical
with the LM324. The TL084
requires some care to pre-
vent inadvertent coupling, a
more serious concern with
the very high impedance in-
puts to each section. One
easy way to overcome the
problem is to avoid com-
pressing the components in-
to too small a space. Spread-
ing the fixed components at
the IC corners in a radial pat-
tern tends to prevent un-
wanted coupling and makes
component replacement
simpler Beyond this, con-
struction is left to individual
ingenuity.
Part of the construction
ease stems from the low Q
of these filters. Most practi-
cal filter article^ ^Till man-
age to repeat the virtually
useless fact that these de-
signs are good to a Q of 500
At normal CW audio, the
bandwidth would be just
over 1 Hz, and the filter
would ring for a week with
just one receiver electron
pop, if it was not already os-
cillating. With normal com-
ponents, practical Qs of 5 to
25 ensure good stability and
Figure
niter
Tuning Range
Bandwidth
Q
8
- SVF,
HxedQ
330-1250 Hz
25-100 Hz
26
9
-SVF,
variable Q
330-1250 Hz
40-75 Hz at
(at FJ
16
12
BO,
fixed Q
330-1250 Hz
30 Hz
35
13
B-Q,
330-1250 Hz
30 He at Qhi
36
variable 0
50 Hz at Q,o
(atFd
21
14
B-Q.
350-1330 Hz
55 Hz at Qh[
18
single pot,
1 40 Hz at Q|o
7.3
vartable Q
(at FJ
15
+ SVF,
340-1260 Hz
40 Hz at 0,11
32
variable Q
75 Hz at Q,ft
17
Qutpiit Voltage Ratio
I.O81I Ff|i»F|(j
2.5:1 Q|ii:0|o
1.4i1 FfijiFjo
2:1 Qh.:Qto
2.8:1 total change
due to both F and Q
2.6:1 total change
due to both F and Q
Notes; *AII filters except
polystyfene capacitors. **
1.6:1 total ctiange
due to both F and Q
(in passband) at R4
the single-pot B-Q used 3900-pF; 5% polystyrene capacitors. The single-pot B-
In any of the fiJters, raise or lower Q by raising or lowering R4, the O deterniining
Notes
3900 pR 5% C*;
reduce R4 from 51 Ok to
330k' '
Reduce fixed-series
Q resistor from 470k to
330k
Reduce R4 from 1.8
megohms to <820k
Reduce fixed series
Q fesisiof from 1
megohm to 470k
awopF. 10% Ct;
increase fixed tuning
resistor from 33k to
>47k to adjust tuning
range
Reduce fixed series
Q resistor from 19 meg-
ohms to <1 megohm
Q model used aoOO-pF, 10%
resistor.
Fig. 76. Test fesults and comments on the s/x sample filters.
112 73 Magazine • April, 1984
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p^S^i U%t Qf Adv»rTi&0ft on pfl^ 130
73 Magazine • Apri], 1984 113
r
WORK THE U.H.F. BANDS
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easy adjustment for ham au-
dio filters. Using 5% and
10% tolerance components
(or bridge-matched 20%
components), Q will be
slightly less than theory pre-
dicts but more than ade-
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The purpose of outlining
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the rules of thumb will likely
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IS a tuii 8 MH/ Jor ton^ier graphics 2?id cokn Re-
quKEs 13 i VDC reg @' 70 ma lo mw outpul pak^
Tuned wiin cryitii 9h 439 25 434 ot 4^6 ^5 Mtl;
TVC-? *TV Dewncoflvirter , . S49 00 ppd.
St'ipiifie i* ■ " "^ " "^ ■ mfnef
dip out Vt . . • , ... ■ . Q^m-
ifud QonnftcLs b^tweeri UHF artr&rcia arid TV %ei Qy{-
put cttairneis 2 or J Vdficap tiiutT 420 lo 450 UHj
P's^quire^ t? tfi ia vfK! ■m ?5 n-d
Extra sensitive TVC ZL wilH NE&4g35 pradmp
i^dBNFf J59,CI0ppcl,
Supsr^ensrliVB TVC 2G vrilli GaAs Fet ^t&amji { 5 dfi
NF) ant mount . $79 QO ppd.
FMA5 AudJo Subcarrier Qenfitator , $29,00 ppd,
Puu uuOjij tin ^au« camera ^mn juil as bt-Mflcasl doest
at 4.5 MHi Puts out 1 V p-p to dfivfi TXA5 Requires
iimlmut l^tD&OOilaml t?to 18 VDC @ 2b m
Works wnn any u^fismittfj with S MHi vMSea tAm-
PA5 10 Watt ATV Hww Amplitier $39.00 ppd
The PA5 HfiVi put oui TO wafts PWS powi^ an sync i:
*l*tn dftYCn wirh W!: ine TXA5 e«ir«r 50 oftrrs
in Ana out phii tonGw a:rj iar rh$ whole b^ndi with good
'm^T'iiy tat co^r i$]d sDuno ftequHes \2 fl VDC reg (§
Let P.C. put you on the air and SAVE!
All four modules —
Complete System price $248.00
SAVE SSXn over price if purctiased individually
Cat! or write tor our corriplstQ catalog of spealfiGations, stallori setup d^agramSp
arid optional accessories which Includes antennas, modulators, test generators,
cameras and much, muth more. See Ch. 14 1983 ARRL Handbook
TERMS: VtSA or MASTERCARD by Telephone or maii. or checl< or money order by
mall AH prices are delivered in USA Charge ardors normally shipped within 24
ftours Personal chectUm u SI c fear tirst
S«e You at Dayton. (81 8) 4474566
P.C. ELECTRONICS 2S22PaxsonUne
Tom W60RG Maryann WB6YSS
Arcadia, California 91006
114 73 Magazine • April, 1384
HAM HELP
W» i/tf fitppf tQ provide Htm H0tp fist-
ings tr99, wi 9 sp^c^avsilBbie btsis. Wv
am not happy wft»n wb ha\fe to iako tima
from ofhar duties to dociphar cryptic
ftotas scfawiad Ufagitty en dog-aarad
po^tCsrds and odd-sUed scraps ot paper.
Pioase type 0f print youf raQUBSt (naAtlyf),
dcui>fa spaced, on an 3Vm "x 71" sha9t ot
p$p0f and u&e upper- &nd iowerca&a iat-
fars wfiare appropriate. Also, pie^sa maka
a "f " fook like a "V not an "C ^^'c^
ccuid ba atf "aC* & an '"aya," and so on,
Hmrd as it fttay ba tQ befmva, wa ara fict fia-
miiiar with avmy pi9c^ of aqmpmartt mafh
ufactutad Off Earth tot the taat 50 yaar^*
Thanks toe youf coopetatioti.
Wanted: bfo transceiver For a Hamfnar-
tund SF«0(MX 1 am 4fi2B {R274G/FRR 650^,
part ni^mbor 31^60-1. Also li«w a box of
Oi>its foe Nationat RAO^ w^idi I wiN donate
lo th« first iaker.
Peter Doherty WI UO
PO B4^x 261
Port Townsend WA sases
About 2& years ago, Ernefson {{ believe}
came out with a portable radio powered by
battefles and/or a built-in solar cell. They
only rna£^ a few. fl wonder why?) It worked
weU wjtfi both sun and aniftclai llQhi- I
would like Ihe naine and address of the
nia/iufacturaf since I wani one of these old
rad»o&
O, tL Estrada
1g6S-4eiti Av«L
San Fr«nd«co CA »41^
RF TRANSISTORS
FRESH STOCK - NOT SURPLUS
I need he*p on Itie Galaxy fHy-Gain) R-S30
so3 id-si ate general-coverage receivef. TlW
pha&e-tock osciiaior is not working. I need
any inforrrraUon on parts sources, aligji-
ment/t roubles hooting data, or individuals
who can rspaJr. 11 anyone wants to start an
R-530 club or newsletter or knows of sameg
contact me.
P!H
MHF4ia
MRF421
MHF4541
IIRF4SCIA
MRF45S
iMRF4S4
WRF4S4A
PiH
WtF40«
iinF422
WflF433
MRF435
MHf449
iffif449A
Type
2-3tt MHt
Ne! MaichyP^ Pffi Net
|ie.O€ $39 01} Mflf4SS n3.50
37 M S^BM MRF4$5A 13.50
12SQ 2A.IM Mn^ASB 1B.00
12.S0 2H..00 MRF4»2 20.QD
IS^.DO 33.00 S8Fa4l3 f5,00
l^.m 33.CM) SnF2T«9 15.00
ta.se 36.00 CO 2 54 5 ts.se
lft.50 9G.aO C03424 ISJW
h^ Gmn M^chad Pm^ & Quam Avatmaia
Net Pm
114^ liRF475
aa.SQ MRF47t
14.50 MRF477
4ZJW SD1407
14J» SOl4i7
14,^ $1IKt2
VHf* UHf TRMNSiSTOnS
Moum ^tmg mhj
tt} 30W 14S^17S
MPF24fl ^\ MW 14S-175
MflF24S <F| SOW 1StH75
MHFZ47 (F) 80W 130-176
hfiRF^ea m 7ow 27-50
SD1416 ^Fj BOW 13MT5
SD1477 {F) 125W 130175
SDU41 ^F| 1S0W 130-175
2NeOS1 {B) t5W 130-175
aN60S2 W 3SW 1S0-175
3MB0«3 («» 30W 130-175
jMflOM (i» 40 W 130-175
ascitis - tW 130-175
a seta it ~ sw t30-i7s
MRF641 m '5W 430-470
WRFe44 (F> aSW 430-470
MflF646 (F| 4SW 430^70
MnF«4S IF* MW 430^70
JecnnKBi Asststance and cfoss-fefetence
iftfoetrmiicn on CD. PT, WR SRP A SD P/N's.
€a0 our ingmeenng Depl (6 f 9) 744-0 72B
WE WIP SAME DAY COD. or VIS AAI.C
Mimmum Order SaO 00 Actd $360 Shipping
RF Parts Catalog Avail OEM & Quannty Discounts
ORDERS ONLY 8(X>e54'l927
Matcri/Pr
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1 320 Grand Ave, San M arcos
Calif ornia 92069 (619) 744-0728
Jim Tumet K5YZS
103 KaHa OHw
WMtahouse TX 75791
^^^w^.^^v
13313 Forest Hill Rd
Grand Ledge, Ml 48837
New Phone:
(517) 626-6044
6-10 P.M.
Sun. tKru Hiurs
SEE YOU
AT DAYTON!
LOOK FOR OUn PEOPLE IN THE
PED 4i WHITE JACKETS.
L
HAM SOFTWARE for COMMODORE M & VtC-^ (H. IH)
Tilt log BoelL a general putpose orDgfain lof ttiA^^ : <r^»y !i>i \!&t c^^ ciand. OTH i OSL SUlim). f«4iiewng A (opbonailyl
Oftfitmg OSOs t&24 ^. postpaid US;^
T>ii Cm^it likof Bf. a fui haiuffrt cofrtesi loggng^dupe cntdong aid tor the rmd-Jefei covviisfer dJI 9S. postpaid USA)
Tta 0«pv Ch&clec l>r tliose who log OSO^ by hand ^ erriar the bind onee lDrdiingeit)andllOlltaecai$ The prDgram cheda for
**«n?5jSL^^5m=^ ****^*^ "^ »N B0«»T7 TH« mirrjct.Ofl 0oo4f IS $3.50. wtBCh rs applrtatJJe
* COmptftef keeps trart ol time & Sate'
* use fl-ta ke^ to sav€. pnnt (optional RS-232. Commodore m 4045 w iui£t«:::£f^ ft/ ^ VF^
no pnnteil t display QSOs' phdenix. A2 35029
* cassetlfl. With albumi & insttuiliofl faoott
■ftTKufwl rn ihh LQg BddN fi CcnlcM I nijqpr nrtiv MiCfiOCOMPUUfl SUSlNE&S APPLICATIONS
COMPUTER OWNERS
AT LAST!
• SendiRece^ve CW with youf VIC 20. PET* ^'
Commodore 64, Man 600/400!
• RTTY for your VlC 20 and Commodore 64!
• PacKage includes program cassette, HO Gonnectof,
Hmrdwa/e Sctiamatic^ * SASE for Details.
CW- $14.95
RTTY • $16.95
Both For 926.95 SA V£!
Mi9\^^'C<mi
wmEorrESTED tu sso.oo
COMPLETE KIT TU $6000
TU CIRCUIT BOARD 510.00
ADD $2.00 SHIPPlNtS EACH ORDER
Many other Programs. Irv stock.
Amateur Accessories, Dept. 73.
6 Haiveat CI, RD7. Flomlnglon. N.J. 06822
{201} 7i2tS5l.fi:30- 10:30 PM Eflstern
We Stock The MFJ1224 CW/RTTY/ASCII Interface
rrrnte;:::: ^^
^luuii
$55 Off!
ALLIANCE
DuaZ-Speed
florofl
for HAMS
S~ 1 5 O
OSL!
' WA9XD0
)i|? L Ci*^^
^m M. V ^^ ^^ '■
1.
$20-00/1 000
ALLIANCE HO' 73 Dua/'Speed rotOf lor Medium
sized H^m antenr>as Strong aluminum construction
witti ha rden^ed■ heavy pitch steel gears & 100 ball bear-
if^gS. Rated for yp to 107 fl^ wind load area & 1000 lb
vertical (oad 4^ m/lbs starting torque Mounts m-
tower, on tow«f or mast; accepts Ih"-!^" 0,D. mast
Mates at fl) RPM for moving over a large arc or ^iow
for peaking s«fnals Aytorr}abc brake system^ large Zh'
meter, cahbfated S WN-E-S m 10* mcrements. Bad
case, brushed aluminum front panel S bezel 17 It^
Regular $154^- Sale Price $99^
Ordir direct from this ad. Sand Ch«ek or Money Order.
For prompt shipment. Call TOll FItEt and use yo^r
MASTFACARD or VISA; COD orders accepted Allow $7
for UPS shipping charges in the 48 States.
t
QUALITY QSL'S PRINTED ON
YOUR COLOR CHOICE OF
HEAVY INDEX CARD STOCK.
FAST SERVICE! SEND SASE
MostorCard
VISA*
FOR SAMPLES i ORDER INFO,
^MHORIZON PRINTING CO.
315 S. CRAIG PL.
lombard.il «oi4a
AMATEUR
ELECTRONIC SUPPLY*
4828 W. Fond du Lac Avenue
Milwaukee. Wisconsin 53216
Phone: {414) 442 4200
Wisconsin WATS: 1-000-242-5195
Nationwide WATS: 1-800-558-0411
AES Sr^ncK Stores in: Oearwater. FL *
Orlando. FL • Wickliffe, OH • Las Vegas. NV
KiiK^g^^ffnp
Sae List ot Advertisers on page 130
73 Magazine • April, 1984 115
NEiy PRODUCTS
DANISH SWITCHES ARE MADE
USER'FRIENDLY
MEC, « D4nl$l) compare situated it^ Bal-
leryp. a suCMjrti af Cop^ihagdn, Dervnark^
h&i tteen i switch m«juifacturef since
1998, yni^l rdesfitlv ct^iKdntraiina oa rotary
mtim 9wficfi6a. H rww artncKmces Itw mul-
tl|Hjrpoee UKIMEC modulaf switch f«nge
Rg. 1 allows ttw bas^e altemat»^<ilion
version of the PCSflwunHiio switcfl {the
Qtfisr ofitton being i momentaiy^akw ««r-
skw|. Hie lanovatkMi Is tfmt each ol the two
evrftches contains all rne contacts nacoe-
sary to provide five aitemativo CiOni»ci
functions; two do eoniacts two make con-
tacts, two bfeaM comacts, two mske and
two lireafc contacts, and reversed poianly,
Fpcm the potni of view of onderlng arid
stodging, ihts gh^^ the great athrantage
mat orily two types of switch need to be
hel^ in iXve- The required tuncttvi ts deter-
mined tiy Simply sefeeting ine appfopfiate
switch temiirmi witti ihe PCB tracking.
Tfie UNIMEC ts « low^srotlle ewdtcli {\0
mm high) designed tor 234'mrTV^^ PC6
mourning The nousing and key afe of
glass^eintorced polycartx»iat« (Makfolon^v
me keycap syatem is ABS (t^^ovodyr). and
the contacts, both fixed and niovtng, ate
0.006-nim sJlver-pfat^sd Ixasa. with go^d
pfat^ng available on r«c|uiest Stainless ^teei
is used for lh« momeni sprang, latch p^n,
and keyBpdng. The swilcti has a minimum
li)«!lme o4 1 million cycles. It can be posi-
tioned on the board straight or with a 180*^
twIsL Gontacl fsslstance after 1 million
cycles is t^p^cally 20 mlll^ohms and contact
bounce Is less ihan t ms.
Figs. 2 end 3 show Ihe assembly of the
finished switcti with kfKib ar>d tieiel. The
design is Intended to ha^i/e tactile appeal »
and Ihe keys, knobSn and bezels are all
available in a choica ot ten colors. In addl-
lion to the dolor-coding poSBibJlllJeSi the
UNIMEG can also tm Illuminated with up to
four LEDs on any or>e switch. The LEOo are
available In reciangulef or pinhead format.
fig, T. UNIMEC m&dul&r switcii.
In Older to make up In#<ii4dua3 switches
into a keyboard, MEC pfoduoes the Vario-
SuppOft, a MakrDton matrix system avaJl-
at>le In any cell oombtrtatlon up to 10 x 10
(Fig. 4X The suppod it provides to the
switch ensures accurate allgnmient and en<
ables the switch to be mounted on a front
panel. Pressure on ttw PCB is minimize^
and PCB mounting is. In fact* no longer
necessary.
The whole amphasjs i$ Qn maklnQ things
easy— the <}esigning, ordering, and as-
sembling—while the materials satisfy the
engineer and the emphasis on a tactile de-
sign makes the finished product easy arxj
pleasant to use.
To get the name of distributors in coun-
tries other than the US, contact MEG, PO
Box 26. DK-a750 Balbrup. Denmark. The
US distributor Is Et^Gtmnfc Components
HAM HELP
I ein looftlng for a echefrtat^c cfiagram
andtor manual for the Etectronica rntecna-
tlonal Corporation mockd 150 WF receiver.
John Vinlng
tSU A. 2nd Street Wwl
Cornwall, OnUiki
HU 1J3 Cansda
I need a copy of Ihe Kenwood phone
pet<^ PC-1A manual. Will pay for the r«prek
eviction gladly.
JUbHtS.Wflde W8JZZ
5S90 E Qalbralth Aoid
Clftdnnatt OH 45236
Wantact schematka lor fl} ^CA WCX33A
scope. 12) Radio Shack catalog no. 40-217
^ereo amp, f:i| Olson nA-l93 stereo receiv-
er, and H) Realisth; 13-1100 stereo receiver.
Adwiaa coat.
J. L Oiy»en
2D2S Sunfclet A«L
Waukesha m &3iae
I need fnstallation instructions for the
Icom AH-1 automatic mobite anteima
tuner.
Tom Ptiipps KA4CSC1
POioxS404
Ft Hood TX 7ftS44
A fdsnd of mJne in Africa asked me If 1
coii\ti ge* for liim a circuit diagram (sch^
maitc dEagram) for a HaJlicraftcrs HT-SS A
and a National KRO model STA 1»
I will f^adly pay postage and copying
oosts if anyofke c^n supply tlnesa-
Rob Harrlnglen
PO Sox 3434
Utlielon CO Htf t1
I raed service literature and m operating
mamial for a Fhden ^305A TTY Ftexwriter.
Hame your prio& Also, does arvyone ttnow
the location of the manufacturef^
Bob Somers W20 YH
411 KamlHonFUL
Glaaaboro NJ 06028
Fi§. a UNtMEC sw/fcA with kfwt *r>d
Flig. Z UMtMBC ^wifch mm tHjUon.
vm
fig. 4. The V^rh matrfx system for design-to-purpose panBf$,
Group, 2€ Worfh Ffffh Street MinneBpotls
M^f 55403; (512^73-1606, Reader Service
number 480.
NEW HAMTR0NIC5
CATALOG
HamtronicSp Inc. has announced publi-
cation of thelf new \964 malloriier catalog
fqr the VHF/UHF/OSCAR enthusiasl and
iwo-way radio shope. The 36-page two*
color cataiog teatures many new products,
Including an exparMled tine of FM repeaters
and accessories «uch as power amplifiers.
OTMF tone decoder/cont rollers, and auto^
palcrtes. Also included are the lines of FM
and AM recervers. FM iransmitters, VMF
and UHF transmitting and recetvlng corir
vertera, apace^uitle paceivefS, fi004iiHz
scanner oorrverters, prearT\ps. and ottier
products Hamtrontcs has long been noted
lor.
For youf free copy ol this attractive r^ew
cataiog. write to Hamfnxiics. tnc^ 65P Moui
/id, Hiiton NY 14468. Of l^K (71^-392^30
(For overseas mailirtg, ple^e send S2JQ0 or
4 IRCs^ Reader Service mjntum 4?9.
REGENCrS 10CHANNEL
PROGRAMMABLE SCANNER
Itogancy Eiedronica. Inc.. now offers a
l£k:hannel programmable acanner with an
araertai of advanced features— including a
JHtle extra help during pfogramfmir^. Be-
ger^ <Ihe only Amerioarvmade scanner
brandl^ haa announced the producllon of its
Z10, covering six complete VHF and UHF
freqiiency bands for access to thousands
of police, fire, public service, business,
co4Timercial, and amateur-radio frequerv
ciee and channels. Selected frequencies
from any band are easy to program into Ihe
scanner's memory; the ZIO can scan the
frequencies In its memory or search the
bands for whomever happens to be lf>era,
TheZlOcan scan its 10 channels in 2/3 of
a second. Searching its three VHF banda* it
can cover 1 MHz £200 frequer^cies in &-KH2
Increments) in at>oul 17 seconds; on Its
three UHF bar>ds, it can search 1 MH2 (80
Chanrtels in l2-5-kHz increments]! in about 6
ss^onds. An automatic priority control
cnecks any selected cnannei every two siec^
oncte and switches instantly il it's acthAk
ProgramrTMng tf>e Regency ZIO Is madt
easief bv a series ol pla^aftgua^e met-
s^es that appeal on its display. Theae
prompts identify the actkm ttiat's In pro-
cess or lequirBd next. IndMdual ctiannels
are programmed by usir>g the numeric key-
pad to enier a desired frequency or by i«lefV
tifying a desired frequency when searchtng.
A special circuit saves these entries in
meniory fer up to a week (should power f aJJ
or if the unit is transported or temporarily
stored^ it does so without batteries (the
ua«al method Ot memory protedionl to
avoid probleme associated with battery
failure from neglect.
The ZIO can pk^ up most transmtssions
in the low VHF (30-50 M^^ VHF two^TMiter
anriateur {144^148 MHz^ standard UHF
(450-470 MK:3, and extended UHF (470-512
MHz) bartds. Its teteacofring antervta ia
11i 73 Magazine • April, 1984
tlBctranlcalJy opljmized for each band, and
an anLenna lack is provktad for an opiion^t
fSGtafna) anienria.
A chftfined tockout oxctudes se4ect«d
channels from being scamod, a usefuJ foia-
ture wit«n {nierest is in monitoring sofno
limited number of channels or when « s^
(acted dwnnel becomes cmly occaskTrsaJfy
of inierest. Scanners in n&maroonm, for ax^
ample, ollen exclude finMtepartfFienl tac-
tical channels ej(cept during ma^of flraa^
A 3can<|eray featura helps keep on top
both ald^g of a convefsatlon on channels
whore call& are usual Ey met by replEes. With
scan delay selected, theZtO wajts for abcui
two seconds at the end of a transmission
(In case there's a reply) btefore II resumes
scanning; without scan deEay, scanning re-
sumes Jn at>out six-tentl^s of a sacond
When search Ing, the Z10 delays louf sec-
onds after a trarksmi&sJon tiefora resun^irig
its search. This not only aJ^o^rs lirr^ to lis-
ten lor a r«pily, but a^so provides erxx^Qh
lime to »e*«ct ttie frequency *oi pcogranv
ming into one o1 ttie t@i scanner channel
memonea— or simply to note it*e frequency
on paper
Ths human factory in the design of Itie
Regency Z10 are quite apparent, Ita «Balty>
rBBdabta (vacuum fluorescentl display has
t^g digits and a ctioice of two bright ness
levels. SMding volume and squelch controls
are easy to position accurately and easy to
mad with a glance. Its audio ampllfbr
delivers a full 1 Watt at fess than 10%
distortion, and a jack for an external
speaker is provided. The keytKjard and dls-
play are angted for ea^y legibility.
Dual power supplies are tiuilt In to permit
p|y(Hn ac operation at home or dc opera-
tion in a car or oth^ vehicle (wtiere not pro^
tl^ed by law).
IhD flt0incy 210 is UL-listed and PCO
oeitffted (Fsrt t5. Subpart Ci It measures
7b» floffsncy ItO scantm:
10^4 inches wide by 2-7/8 inclies liigh by
6-3A Inches deep.
For additional information, contact Pt»*
gency Ef&ctronics, too,, 7707 Recofds St.,
tndianapofis fN 4^26 9986; (3r7)-545^2B1.
Reader Service number 484.
SEA'S AUTOMATIC
ANTENNA COUPLER
St&phems Engineering Associates (SEA]i
has rust introduced the SEA 1612 fully auto-
mattc antenna QQupler- A stateot th&art
nucmprocessor-based coupler, itie SEA
1612 features a "learning modie'' that at-
Idws I! to ramember , ttorep and imwiodLitfr-
ly access data for Instant recall and match*
^ng the rwxt time the same frequency Is
used. On-the-spot tuning is fast accurate,
and automatic.
The 1812 activates on the first syllable of
a voice transmission and functions auto-
matically to effect optimum transoeiver-to-
antenna power transfer ow«r a fulf 1.6-to-25-
MHz frequency range Ttw matching prooe-
dure is fuEty autortiattc and require no ac-
tkNi lpy the operator other Than ttie normal
press4o-taJk function. Trie SEA 1612 does
not require setup by a tochnician and tias
viftualty no channeling limitations, pro-
vidtng an infinite numter of channets vwitli-
in hs spiecified frequency range.
The >612 witi operate with any HFiSS8
transceiver that has standard SO-Ohm out-
put. (Connections beti^raen a transceiver
and the co4>plef consist only of 50-
CMim co^ ar>d a l3.&^ott-<Sc cable. An ""An-
tanna Tuned" flag line is «lso avaiiatile to
signal the operator that the antenna ^ys-
tam has timecL A single 2Z- to 76-foot anterK
na is »il that is r^utred.
The coupler js seff^contained wittiin a
sturdy hous^rtg ol molded fibergiass with a
gaskel-sealsl wealherproof cover. For
complete details and t^itinlcat specifica-
tilons, please contact Stoph^s Engifwer-
ing Associates, inc.. 7030220m SW, Mwnt-
f^kB Terrace WA 98043: (206^771-2782.
leader Senrice numbar 47B.
SOLDERING SYSTEM HAS
OVER 270 OPTIONS
with Wahl Clipper Corporation's rww a»-
sortrnent of 15 miniature soldering irons
and 23 tips, a user can ct>oose from ov^
27Q different soideftng comtainations to
rnatch precise soldering needs.
The 15 Otyi^ miniature IronSv eacfi
weighing ^ ^n ounce or leisA, are avail at>le
for temperatures raj^ilng from S75° to BSO°
P. from 5 to 26 Watts, and irom 4.5 to 24
votis. Thar ooinpact s)2e arM iiKecise tem-
poiBtufe coaitcA make th«m useful for sol-
dering heat-sensitive components.
Tt^ irons can Ije combined with any of 23
tips ranging tn size from 1^" to 3^32" in
several choices of configuration. Tip con-
struction is nickel plated or Iron-plated cop-
per for most applications, with solid nickel,
gold-end. and bare copper alloy {NASA^ tips
available for special requirements. Tip
charges are easy arvd no lools are required.
Cooled tips simp]y slide off ar>d on.
For further IniormatiOfiH contact WaM
Cifppw Cofporsrion, Sterii/tg it 610B1;
(8t5}^2^^25 ^^<^ Service number 483.
FLESH ER CORPORATION'S
NEWTU-IZOO
The new Tll^1200 UHF/VHF mVf lenm^
nal unM from Resher Corporation fs in an-
swer to rapidty^rowlng high-speed conv
Ths SEA BUtOfTtatic antenna tjouphr.
Ttw Oryji ministum soldering system.
73 Magazine • April J 984 117
n
ft^Mi^r Cofpofstkm's fU-f2O0.
municalton needs. Th« TU-120C tBceiyes all
eaudot and ASCII raies to tZDO baixl and
IIMt Bdl 202 stajidafid tones {1200 Hz and
2200 Ht^. The Tin 200 has many apptfc^
tions for modem oommunicatJon^, includ-
ing RfTY repeater eystema. The Tin 200
pfO¥idea TLL- and FIS'2a2G<;ompatible I/O
and Includes tmnsmhter PTT output for
complete remote control. It aleo pro^des
AFSK output and RDA (recaivad data ava(3-
«bkiK
Frofit^anel controls Include onty three
puah-bi/ttop ^witcli«s to Operate: POWER
SEND, and NOf^MAUREVERSE SHIFT.
TKrw LEO indicatqrB show Xfmt Status. The
TU1200 is constnjcted with a alknetat
case for protadioa It's S-l^** W x 1<3M" H
K i" I, tnd rear-panel DS-2S lO comedors
nvilw rnstaJling and using the T\l-1200
aimple,
/miMM eittier wtrod or in kit lotm. tt>e
TU-1300 (^omes eofnpleta wlitt a mating
D&29 I/O ptyg* power soppiy. and an oper-
ator/a&sen'tily nmnuaL The TIKT200 wUi Ii^
availatxe fo# defTvery lyy Apni 30, 1984.
Tor more tnlormation and for a i^taiOQ,
wr^te the Fiesfwf Cofporatiot), PO Box 976.
Topek9 KB ^601 &^ can l^dOO-HAMRTTY.
Reader Service number 4B2.
BTTY TODAY
RTTY Tad Ay is a completely new guide to
amateur RTTY which covers all phases of
radiotalelype This new book answers
many questions asked about amareur
RTTY and olher areas such as the home
compter for RTTY use.
Authored by Dave Ingram K4TWi. a not-
ed authority on all phases ol flTTY. It's wrU-
19) iin a clear, concise manner; all material
k» mm and up-^OKJate and covers the moe)
reomlly developed RTTY eqyipmefii and
ayatteits. ftTTY Todtsy i* futly llltislrated
with pIkMOSk diagrams, FTrTY-stattorv sqI-
ups^ and equipment
K4TWJ's rmw gvide.
In a Large B'A" x 11" softbound edilkm
with an easy-to^read type style and forrrtat,
Bie book's ol0si«n chapters cx^mt. The Ex*
dtlng Wofid of Amateur RTTY, Operating
PararriBtors and Cor^cepts <3i RTTY,
Simsdht Taftc ori Home Computers and RTTY,
RTTY Systems for Home Compot&rB,
RTTY Ca«ive<r1a Yo^ Can Build. Dedicated
RTTY Teiminala af>d Systems, Mew Min^-
RTTY Systems, Fascinating RTTY Outside
the Amateur Banda f Press, Military^
Wfjather, EtcL Frequency list of Commaf-
cial Press Services, Secrecy and Other
Codes Used in Radioteietype Vlod^ and
Tables of Allbrtviations Used ii\ RTTY.
For further infomatioa or to ortter^ write
or caJJ Univerami Etectfonics, irnu ^^55
Groves Boad, Suiia 3, Cofumbtis OH 43227;
{dU)^G&4$0S. Reader Sefvice number 4d1.
RTTY LOOP
Marc I. Leavey, M.O. WA3AJR
6 Jwny Lane
PfkBSwm MD 27208
Last month I wrote a bit about a new toy
here at WA3AJR, a TR&^IOC Color Com-
puler. Based on the moat powerful a^ght*
bit mlcroprocerssor around, the Motorola
6809. this is a Fascinating compulei' which
givea huge potential at a bargain prfce.
Well, I have had a chirkce to take a
quick look at one place of RTTY software
aval fable for the CoCo— a RTTY/CW pro-
gram from Ciay Abrams Software. Clay Is
known to us eBxx mavens from way back
and has ^een one of a kernel of Ixx^ters
for iOx^t systems for many years. ThJa
looks like one fine piece o^ software,
folks- 1 will have a full review next months
tNji for those of you wti^ Just can't wait, let
me dangle a few choice tidbits. This pro-
gram w^ll receive and trgnsmri RTTY at all
common speeds, either in Murray or
ASCII and receive and transmit Mo^se at
up to 09 words per minute. It has buffers
for transmit, tape save, ar>d more. Not all
is golden. Clay, but I am impr^sedt More
about this gem^ next month.
Not to stay stuck in one CPU vein, t have
a card here from Henry KIrchmer KF4UW
in Rockledge, Florida. Henry asks, "Do
118 73 Magazine * April, 1984
yoo know if anyorke makes an Interface 1^
RTTY and CW and the software lor the
Timex^inclair 1000 or new 1500 th«l t
could use with my (transceiver?" We^l by
a stroke of serendipity^ also in the ma 1 1 ar
;ftvfid an Issue of OZX, billing Itself as 'The
Journal Cqwerlng Amateur Radio and Sin-
clair Computers— ZX^, Micro Ace,
ZX-BI, and TlmeK/Sindair 1000^500" In
the issue l received (November, 1963), arti-
cles Include several for interfacing the
TimeK/Slnclair-iype machines on RTTY
end CW, with explanatlona of ASCII and
Murray (although they call it Ssudol) code
for the com p uteri St ham. They even have a
short bibliography in the back with art^
Dies in various amateur-radio maga^lnas
related to RTTY. I am a bit disturbed, how-
ever, that while ttiey have a listing for 73:
Amaret/r Radio's T&chnicaf Joumat. ihey
do not mention this column. Oh well, I
quess somebody at QZX reads this col'
umn— ^aftet all, I did get a copy. Anyway.
Interested prospective readers might dro|>
them a line at QZX, 2025 D'Donnell Drive.
Las Cfuces, New Mexico 38001. A year's
subscription is $1 2, according to the infor-
mation received. It wouldn't hurt if you
mentioried that you read about them in
"RTTY Loop ;■ would it?
Another source of RTTY for tha
TtmeK^inclalr is Ken Carpenter KC4UQ
who makes a series of programs under the
business name of Kent rentes. Thai Is not
to be confused with Kantronics, mind
you! Well. Ken offers a series of pro*
grams, including RTTY Jranscelve pro-
grams. Morse programs, and some ama-
teur-raddo utiiittes, all designed tor the
TlmexySinclair IDOO or Sinclair ^^1. His
RTTY program, tor example, is touted as
featuring receive and transmit tHtflers,
sptit-screen disptay. multiple t>aud rates
for either Murray or ASCII modes, hard-
copy option, and mora Requirenrienls irv
clude a ccm|>ulef wHh 16K or more of
RAM, a RTTY HO port, and a terminat unit
capable of inteffacing with TTL-tevel {not
RS-2321 signals.
That \iO port Is designed around an G250
ACIA which takes care of providing a baud
Clock along with converting serial to paral-
lel and back again. Apparently, there are
also transistors provided for some degree
of isolation from oulside voltages. No men-
tkjn is made of optoi&olators or the like.
T)^3^cal prices for these items am $25 for
a tape of ttie RTTY pro-am, guaranteed to
load or il will be repilaced upon ret um, and
$70 for an assembled and tested interface
lAii^ plus pottage and handling, t have no
information on how wefl or easity this RTTY
mterf aoe operates; rnaytw some o* yow who
have played with 11 will let me know. How-
ever, It does seem as ihtough more is lie-
ooming available for tf^3 truty tow<cosi
computer.
If you tftfould nice more details, write to
Ken at his office. Kentronics, Inc., PO Bok
5Se, Vernon. Alebama 35692, Be sure to
watch the spelling of tiieir name^ arK) drop
ours, OK?
While I cannoi speak from Ihe experi*
erKie of having used the following program
myself, a letter from Jarry Welkrauch KftHZI
in North Riverside, lltlnois, speaks very hi^-
ly of a RTTY program tor the VIC-20 and
Commodore44 computers. Avaiiable from
f^^K Electronics, these pacirages future
software to turn either computer irrto a
basic RTTY terminal and sell for under
twenty dollars each. Sourxte like qune a
bargain! You have to provide a temunal unit
or some othi^ way to lufn ttie receh«r audio
into onfoff pulses and an AFSK oscilJator to
garwrate the necessary tones. If you're in-
terested, drop RAK a line at PO Box 1585^
Orange Park. Florida 32067-1585. I donn
need to prompt you as to vsriiere to tell ttiem
you read at>out them, bul let me know what
you think if you try the software.
QoJng from systems that aeem lo have a
lol written for them to the other extreme, \
have a letter hare from Philip Shulins
WD40SS in Davlona Beach. Florida. Phii
TWtes that tte Is "droo4lng with anticipa*
tion" looking for a RTTY program for his
Kaypir&2 computer. WalL Phil, as I ha^ in-
dicated hkere before, there r»ve been re^a-
hvefy few programs, or ewn program an-
nouncements, ttiat have crossed rny dosfc
for Itie IBM-type computers. If you can run a
Siiandard CP/M-type program, you may be
able to find one on a local RBSS, but othev^
wise, I am afrsKI t c^w a blank, 1 wifl keep
my eyes out, ttKHigh, and pass along any in-
formation! ! receive here to you and the fest
of the gang.
t htave a letter here from Hughie Chavis (I
can't find the envelope, so I am not exactly
sure whare h# Ig). Anyway, Hiighiie is trytng
to run a Teleeype* KSR4S Uom his TJ-g9/4A
computef by running data out of an F^232
nio(fijt«. Ha writes, niw K5R^3& is sat fof
100-wpm sefial data tra/isfef. The Joweat
l»aud rite for (tia m 9S-232 rnoduie 's 1 10
{»ud. The T1 85-232 module has a PIA port
in addition to the serial UO port. My ques-
tion 15, fKfitt do I connect the KSR-i^ to the
PS-SSi module so the printer capadlltty can
WeHt iM^a to t V9rv tiasJc pfoblem with
(sonneciiflo th«w two units togaihef« tttey
a/e not sp9akLn$} the ft^me languiioe. For-
get diaiecta^ I'm talking majo^- Ian-
gyagaa ASCit artd Murray a/e about as
ditterant as Er^llsh and Habraw. It would
not t» too hard IG conr^ect the parallel port
of theTl Inierfaca module lo a simple UART
chip (such aa iha common 1013 variety),
provide a clock circuit, and put the data out
at the correct ratQ, but Iha problem remains
that the data comlno out of the computer is
in the wronQ coda.
Let me explain. To b^ln wtlh, feali^e that
lh« "tMud'' dflsJQnatJon merety refers to
tww nviny daia t>tt$ per second are being
trajismitted. There b no nslatiort between
tl^ "tiaud rate" arxj ihe type of encoding
uaed to send tba data^ With plain old Mur-
ray code— the dne we are all familiar with
Oft RTTlf* and the Of» wWcft your KSR-36
apeeKs— one common speed is the so-
called 60 MKKds per minute. Now, not to go
Into a^l ttie math rigtit now. ea^ character
eOftSiat^ of riv« data bits, one start bit, artd
a stop tM t which IS a lad longer ttian the oth-
era. Tttis works out to 7^1 units per cttm-
acter, with each unit being one bit of 21 ma
tength- Each character thi^ taJcaa 741
times D,021 aeconds, or DJ63 seconds. Jn
one minute, there would be 368 characters;
in ofw second, 6 134 characters. Now. 6.134
Characters per second times 7.4 1 bits per
character ^remember how the units can-
cetsd out In algebra?) yields 45.45 bits per
second. Thia Is 45.45 tsaud.
Without working through all this math
agala trust me that the commonly caJled
"IQQ'wpm" spedd la about 75 baud. That'a
one problem, and we're still talking (Ive-
levU Murray code.
The Tl computer, as moat others, use®
aoven^t ASCII to communicate with (tw
outside world, ^kiw each character con-
aiats of a stan bit, s&4&y data bits, a parity
bil, and eitt>er one or two stop tiits. depend-
ing often on Ihc hardware invoh(«d. Theee
bits do not in any way, shape, or form corre-
sporkd (0 the RTTY Murray code, Wtial you
wilt fiave to do Is corwert ttie ASCII coming
out ol the computer to Murray, shift speeds,
tfwi put ilin a form that the KSR^ can
I'll let you thinK on tt>at one for a bit, and
nasct month I'll show you a few ways to ac-
complish this task. White software leciv
niques have tieen the most popular with
usars of some computers, the limited ac-
cesa to ihe TI-99i/4A's Inr^aids might well
hamper that approach, ar>d I feel that you
might be Inclined to stick with a totally out-
board approach. Let me get out the drafting
tioard and &ee what develops.
Now, a note to all of you who have tried
to cati m© on the phone over the last few
months. Please don't. Jt's not that I diaiike
your calls, but I am a physician and my
home number Is not listed ft win stay that
way for professional reasons. My office
nymtxv. or answering s^vice. has fielded a
number o* RTTY oaJIs in past month*, ar^
they dont always Know wttat to do with
thenL SOp {f you ttave a Question or would
like to offer some words to the co^unwi, Jo*
trkem down on a card or fetter and mail them
to rrw at the atjowe addre$&. tf you would
like a repfy. enclose a seJfnaddressed«
stamped envelope, and I shall try lo awwir
you as &oon as po^Jttle. { try lo schbt>le
somBth^ng down, usually at the bottom of
your letter^ and return il to you within a few
days, unless t need to hold It for Informa-
lion. pubUcatJon, or the like, I Iciva hearing
from you ail, pro and con, arx5 it la often
your Input, suggestions, and quest Ions
which make many readers write that the
rirat thing they look for when they get their
copy of 73 Is "RTTY Loop/'
CONTESTS
Robert Baker WB2GFE
15 Windsor Dr.
Atco NJ 08004
HOLIDAY INOIXIE QSO PARTY
IdOO GMT to 2300 GMT April 7
The seventh annual Holiday^n-OiKle
QSO Party will be sponsored a§ain this
year by Shreveport, Louisiana, ham-raddo
operators. Operators will be working on 40
meters, 20 meters^ ar>d 15 meters. If 1 0 me-
ters is open, we will try It from 1800Z to
1900Z
HoNday-in-Dlstie Is an annual ten^day
celebration of the Louisiana Purchase.
EXCHANBE:
RSfT) and QTH.
FREQUEt^CiES:
CW— BO kHz up from low edge of 40-,
20-. and 15-meter trends.
SSS— 7240, 14280, 21370, and ^570.
Noyice-71^ and 21 12S.
AWARDS:
Send an SASE with QBL card to IHoll-
day*ln4>iKie QSO Party, PO Box 4842.
Shrevepori LA 71104. 8^A*x11^ certlfl^
Cates will be mailed upon receipt of the
SASE and OSL card.
QRP ARCl APRfL QSO PARTY
Starts: 1200 GMT April 21
Ends: 2400 GMT April 22
Qtationa may tse worked once per band
for QSO multtf^lier credits. Participants
may operate a ma^dmum of 24 hours dur-
ing the con lest period.
c
AprF
ALENOAR
HotkSay-ln-0<itla QSO Party
Apr 21-22
OftP Amateur Radk) Club April QSO Party
Apr 28-29
Ua aaachuseHs QSO Pirry
Apr2i-29
County Huntara SSB Conl^l
A|ir 28-29
Hehretta Contest
llayS-«
Lite S|Kin$r QRP SSB Actlvtty Wftikand
WayS-e
f lorkla QSO Parly
May 19-21
Michigan QSO Party
Jiin9-10
ARAL VHP QSO Party
Jun 23-24
ARFtL Fiald Day
JutlS-IS
AS International SSTV-DX Conlaal
Aug 4-5
ARAL UHf Ci^ail
Aug 11-12
Maw Jersey OSO Parly
Aug 24»27
AS North American UHF FSTV^DX Conteat
Sep fi-S
ARRL VtHF QSO Party
Sep 15-17
Washlrigton State QSO Party
Sep 22-23
Late Summer QRP CW Activity Weekend
Oct fl-r
ARRL QSO Party— CW
Od ta'-l4
ARRL QSO Parly— Phone
Nov 3-4
ARRL Swe«patskeS"CW
New 17-18
ARRL Sweepstakei— PhOfM
0«et-2
ARRL 160-Metar Coniait
Dm: 8-9
ARRL ICMMfltsr Cofiteat
Dec 2«-Jan 1
QRP Wintef Sporta— CW
BXCHANBB:
Membefs— flS(T>, state-provlnce-coun-
try, and QRP AflCl membership number,
Nonn%emt»rs— RScn, st3tef)rovlnce^:cun'
try, and power output.
SCOfUHQ:
Each member OSO counts 5 points m^
gardleas of location, Honmember QSOs
ire 2 points with US and Canadian sta
tions. others 4 points eacht Multipliers are
as follows; 4-5 Watts output— x 2, 3-4
Watta output— X 4, 2-3 Watt* output —
X 6, 1-2 Watts oirtput^xS, and less than
1 Watt output— X 10. Entries from sta-
tions running more Ihan & Watta output
will count aa check toga only. Statksna
are eligible for the following txxius multi-
pliers: if 100% natural power (solar, wind,
«ie,} with np storage- x 2, If 100% bat-
tery power — X 1 .5.
Final score is total QSO points times tO'
tal number of states-provinc^is -countries
per t>arhd limes the power multiplier times
the bonus multiplier Cif any}.
fBEQUENClES:
1810^ 3560, 7040. 14060, 26080. 50360.
MO¥icen'ech-'3710, 7110, 21110, 2fttia
Ho 30-iTketer contacta will be counted!
AWARDS:
CerlfUcates to the higt^esi^scorlr^g sta-
tion in each state, province, or country
with 2 or more entries. Entries automati-
cally considered for annual Triple Crowna
of ORP Award. A special MILL! WATT eer*
liticate is b^ng sponsored b^ WiBSP for
NEWSLETTER OF THE MONTH
Dateline Nashville: Source of muflied guffaws amanatir^g from city sewers
confirmed, RATS J Don't panic. Music Gity, I fa only members of the Radio Ama-
teur Transmitting Society of Nashville enjoying the I at eat issue of BBt*s Tsie.
This publication Is a pleasure to read. Surrounding the obligatory meeting an^
nouncements are the exploits of Chairman Mac, Boy George^ and the ublq^ultoua
Or. Jack Byrd. Animals tiptoe across the pagas^ Seedy rodonta in thiee-piece
Bulta adorn the masthead.
Deapite the light hearted mood of Rars Ta/e, editor Wayne Renardson NZ4W
hae skillfully tempered the hilarity with genuine news stofiea, thought -provok-
ing commervtary, and scathing letters from the memberahip. Close attention to
mechanical detail rounds out a package any RAT would be proud of.
To enter your club's newsletter in 73'^ Newsletter of the Month Contest, send
11 to 70, Pin« Street, Petaffoofough NH 03458, Attn: Newsletter of the Month.
73 Magazine * April, 1984 119
the higrmst-scorir>Q silalliQfi In |he le&s-
thafi-l4Afatt category, providod Ihefe sm
two or more entries In Itial power
catagoiy.
COGS AND Em^HiES:
SapftTste log srveeis am tug^6;$i&d for
$4Cti band fof «ase o1 acorirtg. Send full
log data, ioclud^ng lull fiam«. address,
ami bands u^ed. Also send a work sneet
showmg details and tirT>e(s} off air. MaKa
sure your ca^l^ign Is wrttteri on the top
margin of ^very page sutifnltled! No log
copies will be relurnod. All entries desir-
ing re9utl:$ and scares please enclose a
buslrtess-size enveEope with return post-
agie for one ounce or an IRQ. It Is a condi-
tion o1 entry that the decision of ttie QRP
ARCI Contest Chairman is final In easfi oi
dbpute. Logs must be received by May 21
to quality- Send all logs and data to: QRP
AUCI Contest Ctialrmaiv Eugene C
Smim. Jr. KA5NLY. i16 Fairmont Drive,
Uttle Rock AR 72204,
MASSACHUSETTS QSO PARTY
Starts: 1600 GMT April 28
Ends: 2400 GMT April 2S
sponsored by the PiEgrlm Amateur
Wireless Association. A si at I on may be
worked once per band. Phone and CW are
considered separate bends. No cross-
band or repeater con tads are permitted.
Mobiles end portables may be contected
each time a county chiange takes p3ace-
EXCHANGE:
RS(F) and state, VI province, or Massa-
ctHJSMis county, liassachij setts staticsfts
alao will indioate It n^ember of PAWA.
SCOftiNQ:
M\ stations count 2 points fof eachi
completed SSQ exchange ajxl * points for
each compfeted CW exchange. Masaa-
chuseits stations then take the total OSO
points and multiply by the total number of
Massachusetts counties, states, prov-
inces, and PAW A members worked to
compute the final score. Others, multiply
the total QSO points by the total number
of Masaachu&etls count ies and PAWA
members worked. Multiplier credit for
PAWA club members worked may be
counted only Or^oa
fRBOU£NCf£S:
Phocie— 1620, 3960, 7260, 14280, 21380.
2a5dO,ar¥]50tm
CW— laiO, 3560. 7060. 7120. 14060,
21060. 21 120. 28060, and 28120. Usa of FW
simpteii is eTK^}grag«t. Plaaae u34 CW am
CW bands ontyi
AWARDS:
i^ftitlcalea wiU be awarded to 1st-.
2nd-, and 3^d-place winners In each Mas-
sachusetts county, state, and V£ prov-
ince, plus the high-scoring NovEct In each
state. A plaque will be glv^n to Ihe MasBa-
ehusetts station submitting the higheet
number of QSOs bettering the record of
1483 QSOs now held by K1QSK In the 1979
Massachusetts OSO Party.
ENTBiES:
Log^ must show date, tlrr>e, band,
mode. oallB^gnH state ar>d province
worked, and excliange RSfTy. Siibmll a
MpVtli summarv sheet atong «rith tf>e
togt^ Symmary sheet should include:
namie, call, mailing aijdress, Massachu-
aelts county, toUl QSO points, multiptiers
ctaifTtod, and lotal scorei Ait entries with
more than lOO QSOs please send a dupe
sheet. Deadline for mailir^g is May 31. For
awards and results include $0,40 postage
{no envelope). Address entries to: Ed
Peters K1KJT, 29 Greenbrier Drive, New
Bedford MA 02745.
COUNTY HUNTERS
SSB CONTEST
0001 to OaOO GMT April 26
1200 GMT April 28 to
0800 GMT April 29
1200 to 24O0 GMT April 29
Rease rM>te the two 44KMjr reaf periods.
Mobiles may be worked each time th«y
cnange counties of bands. Mobiles that
are worked again from Xfm same county
on a different b^iid count foe point credit
ooly. Mcbties that are contacted On a
county line count as one contact but 2
muEii pliers. Mobile teams count as two
contacts If both participate In the ex-
change. Fixed stations may be worked by
other fixed stations oniy once during the
contest. Repeat QSOs between fiKod sta-
tions on other bands are not permitted.
Fixed stations may be worked try mobltea
each time they change counties or bands.
Repeal cool acts bilvieen mobiles are pW'
milled provided iftev are on a differefit
band oir co«unty. MtKod-mode contacts am
permitted provided ttiat on^ siatiofi Is on
SSS. Contacts made on rtet trequencl^
Witt not be AltoMfOd for semiring In this
year's contest
EXCtiANQm
Signal report, county, and state or
country.
FREQUENCtES:
Suggested frequencies are as followar
3&20-3&40, 7220-7240, 14275-14206,
21375-21395. 28625-28650 There will be a
"mobile window'' of 10 kHz on the follow-
ing (requencies: 382&-3a35. 72^-7235,
142B0-T4290. Mobiles will be in this
10-kHz segmtnt and fixed stations are
asked to refrain from callino "CO
contest'* in the mobile window. After
working moMtos In Ihe wItkIow, fJEad sta*
tlons are raqtiosted to OSY outside the
window to work (ixed statioos In the con-
test. This will allow the rT>o<biles running
lower power a cha/tce to be neaid and
worked in tt>e contest.
SCORiNQ.'
Contact with a fixed US or Canadiart
station— 1 point- Contact with a OX sta-
tion {KL7 and KH6 count as DX)— 5 pointa.
Contact with a mobile station— 15 points.
Contact with a mobile team station— 30
points. The multiplier Is the total number
of US counties plus Canadian stations
worked. The final score is this multiplier
times the total QSO poifits.
AWARDS:
MARAC plaques to ttte hlgheat^corlng
fixed US or Canadian station^ DX station,
mobile team, and top 2 motNle staiions.
Certificates lo tiw top 10 fixed, mob^te
leam^ arKt mobile stations in itie US aiKi
Canada, and to the tiigheat-scorirkg ata-
i ion in each PX country.
ENTRIES:
Logs must show date and time^ station
worked, reports exchanged, county, state,
band, d aimed QSO points (1, 5, IS, or 30),
and each new multiplier must be num-
bered. Logs and summary sheets are free
for a #10 SASE or SA£ and appropriate
fRCs. Wfite to; Jo*in Ferguson WHOWS,
3820 Stonewall Ct., Independence MO
6405$. Atl entries must be received by
June 15 to t)e eUf^ble for aw^nls. DX en-
trtes should use Air mail. Winners will be
armounced at the 19S4 ffKlependent Coun-
ty Hunters Gonventkm during July, ar¥] Ln
the MARAC N^wsletmr.
HELVETIA CONTEST
Starts: 1300 GMT April 2S
EiKls:13OOGMTApnt20
Use all bands, 1.B to 28 MHz, on CW or
phone. Each atatiion can be worked once
per bar^d regardless of mode.
EXCHANGE:
RS(0 plus three~1l0ure serial numt>er
starting at OOt. Swiss stations will also
give their Z4etter canton.
SCOfUNG:
Each contact with art HB siali<»i courtIs
3 points- The multiplier ^s thte sum of
Swiss cantons woriied o>n each band, 26
maximum per band- Fina^ score is tfie sum
of QSO points multiplied by ftie sum of
cantons worked on eact^ band.
ENTRIES AND A WARDS:
Certificates will be given to Ihe hi^ghest
scorer in each country. USA and Canadian
call area are considered as separate coun-
tries. Entries with more than 1 log sheet
must have QSOs separated per band. A
multiplier checklist Is appreciated. Use a
summary sheet as usual and indicate call,
name^ address, single or multi -operator,
numtier of QSOs« poinis ar»d multipliers
per band, plus total final score. Atso in-
Clwfe station description, power output,
and declaration that rules oi the contest
and license regulatlofts f^ve tieen ob-
sen^ed, liigs must be postmarked not
later tfvan 30 days itter ttie (^>ntest and
sent to: Gody Sialder HBSZY, Tellenholl,
CH-6045 Meooen. Swlt2efiand. Canton ab-
bieviations are: ZH. 8E. LO, UR, SZ, OW,
NW. GL. 2G, FR. SO. BS. BL SH. AR At,
SS, Ga AG, TG, Tl, VO, VS. NE, GE, JU-
H26 AWARD:
This award Is for contacts made after
January 1. 197&. Send a list and OSL for
each of the 2S cantons worked to: Kurt
Rindschedler HB9MX. Sirahleggwsg 2B,
CH-B4{!0 Winterthur. Switzerland.
Chad hams VP2ML
Box 4881
Santa Rosa CA 95402
THE WONDROUS WWV
What one station do hams listen to
more tttan any otfwr? WWV probably has
the lock on that slattstlc. WWV has twen
pnoviding time and froquaicy Information
(o amateurs and ottiers ^ot more tfian 60
yfMTi^ Let's tiave a dose look at tf>e sta-
tion and how WWV can imfirafMe fom
DXin^
Rrst, you trave to heat Ihie station. Al-
rrtt^t every modem amateur rig ftas a sep-
arate position on the bands witch to re-
ceive WWV, usually on tO MHjl Simply
connect an antenna, switch to the WWV
position^ and tune to the appropriate fre-
quency. Note that WWV transmits in AM,
so use Ihe AM position on your receiver or
turn off the bfo.
The first thing you will hear IS a steady
500^ or 800-Hz tone, Interrupted every sec-
ond by a "tick" or pulse. At lf\e end of
each minute, the tone stops and a voice
gives the time in C^oordinated Universal
Tlme(UTC), Tt>e next minute begins with a
longer tone of 1000 Hz, The staff of this
longer tone is ttie en act start of the minute
just identified by ttie vo^ce announce-
ment In othier wofda, you hear "At the
torve ?7 hours, 19 minutes Goordinaled
UniversaLl Time. . . .Beep." The time is ex-
odty 1713 UTC at the start of ifie beep.
RrotabJy the first thing a DXet will do
when 11 sterling to WWV is to reset his or
her watch and radio^haclc cfock. Every
OXer Should have at least one feasonabty
accurate clock set to UTC. Since you can
purchase a digital watch or small, stick-on
clock lor less than five dollars, there is
really no excuse not to fiave a timepiece
dedicaied to UTC. And do you know tww
you can tetl a true OXer? His wristwatcfi is
set to UTC*
How oi^en sfKHilcl you reset your clock
or watcli? That depends on how well II
keeps time. My ancient Tyirreter clock (tfie
one with the numbers en plastic cylinders
which provided a "digltar' readout years
before liquid-crystal dispiaysj keeps such
good lime that I oniy reset it every month
or so. You can note the time you reset Ihe
clock In your log so that you can look back
to see how much time your timepiece has
gained or lost J I your clock is off by more
than one minute a day, reset it every day.
An error of only a few minutes in '^ur
log can make the ditf ererkce between coiv-
firming ihe contact and not, A DX station
might t>e makirtg as many as 6 contacts a
minute- If your time on your OSL card IS
off by only 3 minutes, your callsign mi^l
be 20^30 calls away from your claimed
lime. Tlie DX station or QSL manager may
have to search an entire log sfieet for your
calf, 6y having your tim^ accurate to the
minute, you can reduce the chances that
the DX station will not find your c^ll.
You can aiso check the tlrrke on your
shack clock after an Important contact.
Simpty tune immedtately to WWV and
note the time difference betw^m WWV
lime and your clock then criange the time
in your tog to rnatch the correct time. You
can trust WWV to tiroedcasf the corr^t
time
The Atomic Clock
L£t's have a look behind the signal and
see why you can trust the accuracy of
WWV. The time broadcast on WWV de-
rives from the clock a few miles south , in
Boulder^ Colorado. There, nestled against
the Rockies, only a lew miles from the
Gontinenia] Divide, sits NBS-6 (see Photo
A), NBS-B is the latest In a line of cesium-
beam clocks produced by the National
Bureau of Standards. These ^ium-t>eam
clocks use an aulomattc fe^back system
to produce a microwave signal of exactly
9,192j63t;770 Hz. This tr«quency is a reso
nant frequency of the eesliim atom, upon
whidi the atomic dock is based.
During thie 30 years that tbe National
Bureau of Standards has been workirn] on
atomic clocks in Soutder. ihey have prO'
duced the most accurate and stable time>
piece In the world. In fact, scientists re^
cently redefined the Intematlonal unit of
length, the meter, on the basis of the ac-
120 73 Magazine • April, 1984
PttofQ A N8S^, th^ cGsium-i>eBm 9Wmh dock at f/» Nsfio/tat BomAU of Sfamt^fiis in
BoifUfv* Coiofwdou This dock is iim most accurate timept9ce in ifm worfdf
Photo C. Engin^^ Howtrd MAChfart wit ft two of tfw thrse itientiCAf cesium-im&m docks
which ke^p the tim^ at tfm WWV ttansmitt&r sitm in fort Ct^tins,
curacy of the cesiym-l>eam clock. N8&6
(s accurale to belief than one part in ID
Irlllion. That's about one secomi In 3 mlt-
Hon yeartl
NSS-fi ia so accurate that the time it da-
term I nes Js more accurate than the
Earth'^ rotation. Since all our clocks are
based on the cesium-beam atomic Ctock
in Boulder^ it would t>e possible tot this
time 10 be "out of synch" with the raat
world. MJdrviQht wotiEd move slowly to-
ward evenmg. A far mone practical p^ob-
Fem would be that sailors navigating by
the stafi would find themselves in tlie
wfofkg piocef Scientists got around this
proMwn by agreeing lo add "leap sec-
onds" to UTC as often as needed to keep
aiemk tirrie in step with sunrises and sun-
sets. About orvce a year they add an extra
3e<poncl to {he day at midnight, to kee^ ev-
eryone on the same time scale.
But all this is down In Soulder. about 30
miles from the site of WWV, outside Fort
Col line, Colorado. What's the connection
betweer> the atomic clock in Boulder and
the WWV transmitters? Sufprtsingly,
there is no direct connection. The time
transmitted by WWV Is generated right
there at the WWV site, by smaller cesium-
beam clocks. WWV us^ three of these
Hewlett-Packard ^ommefclal-nrtodel cesi-
um clocks {«t atXHjt S25,Q00 eachK
Why ltir€« clocks? The argument is as
follows: If you have only i^ne clock, it
mi^hi thfeak down, putting you off the air.
<x It miflttt be wrong. Tt>efe would be no
way lo chick its accuracy. On the other
hand, If you had two clocks, and thoy
showed different tirnes, you wouldn't be
able to tell which one was correci. Only
With three clocks can you tell if one is in-
corfeci' M one of the three ciock$ malfunc*
tions, an operator must repair it as quick-
ly aft possible, to avoid the two-clock
problem.
Of course, these atomfc clocks keep
pretty good time all by themselves. J
welched a strip<hart recorder measure
the time variation in the WWVB clock$^
and with a full scaie of only on^ microsec-
ond, I he pen didn't even wiggle down the
c^ntvr of the chart! Even so, the timfe they
genefBle 1$ regularfy (XHtipared to thai
produced by the master atomic cfock
down ^n Boulder.
At one time they physically moved a
portat>le atomic clock from one town to
the next to make this comfiarjaon. but the
WWV Chief Engineef, John Milton ex-
WSDAV. came up with a better way usmg
Denver TV staUons. He compaies the time
a certain reference point on the TV elffnal
arrives at Boulder and at the WWV site fur-
ther north. He knows how much further
Fort Collins Is from Denver than Boulder
and can detentiine ttie extra time the ref*
erence point should take to reach his
receiver. A custom computer program
handled th6 actuaf comparison and recali-
brates the WWV atomic clocks dally.
Even without this daily check, John Mjf-
ton feels confident enough of his equ^P'
ment that he could maintain the high ac-
curacy of the WWV information. "We
know the drift rates of each clock so well
that we can keef» go^ng for months with-
out any reference standard," John says.
This drift Isn't much: about one4enth of a
microsecomJ in four htours!
Getting the Wofd Out
Of course, all tne accuracy in the world
wouHd be worthless if you had to go to Fort
Coliins to check your watch. Thanks to
WWVt however, you don*1 have to travel to
Colorado for this Information.
All the WWV signals, tones, and even
the basic carrier frequencies are derived
Trom the same cesium-beam clocks which
keep track of the time- The extremely sta-
ble SignaJ from the clock Is divided and
mixed to produce each different signal,
tick, tone, and beep. Onty the voice an-
nouncements don't come out of the ctock.
This means thai lust about eveiything you
hear on WWV {carriet ffeqtiency, tone fre^
quefkcies, etc.) hias the same high degree
of accuracy. That rnass oi cables above
the digital readout (see PnoioC} is a patch
panel for all the frequency dhwders af>d
Photo B. John Milton, chief engin&er at WWV, keeps the Ume-and-ff^v&nOy'$tAftdaref
statioft on the air. on time, and under budget
other circuits which produce the pattern
of tones and ticks on the WWV signat.
The only parts of the WAA/V signal which
are not produced by the cesium clocks are
the voice announcements of time and otiv
er factors. These voices are recorded on
ht{;h<quallty drums and added to the WVW
signal at the approprlale time. No, there
isn't anyone sitting there reading (he time
aft 24 hours.
All the WWV signals, on 2.5, 5. 10> 15,
arKJ 20 MHl are ampfitude modulated
ikUt After thie basic signal is generated
by the cJock. complete wflh lones^ etc.^ ft
leaves the lieavffy-shieid^ clock room
and go^ to the aeffes of ft amplifiers ar-
ranged in the circle arourKl the buifding.
The«« transmitters are 1 1 near amptiflfifs
which lake the low-level signal from the
Clock room and amplify it to about 10^000
Watis output! fThe ^5- and 20-MHt amps
ftin a mere 2,500 Watts.) For good rellabili^
ty. these amplifiers are 40, DOG- Watt units,
run at low power.
ReJJablllty Is a key factor a I WWV, The
total "down time" is less than 0002%!
Engineer John Milton has developed a
complete package of procedures and
equipment to ensure this fantastic reli-
ability. First, each of the three cesium
clocks has a backup battery system,
9tiouid commercial power \a\l A huge die-
set generator sits in the back of I he WWV
buMdirtg, ready to kick in at a moment'?
rtot^ce and power all the transmit tecs. And
e^ch tran^mittef has an automatic reset
feature. If the transmitter tails for wttat-
ever reason, ttw built-in system will re-
start the transmitter. If it fails again, one
of the standby transmi Iters takes o^er.
There Is a "dedicated" standby trans-
mitter for the 5-. 10-. and 15- MHz signeis.
all wired and tuned, set for automatic re-
placement. WWV monitors the attuaJ
transmitted rf, listening for any change in
signal strength.
The signals leave the WWV building
through gas-filled coaxial lines to one-
half -wavelength, vertical antenna^^ Tt^se
are simply dipoles stood on end. This
filMt a good omnidlrectionaf pattern.
Tfmm are even spare antennas: Two all-
band verticals stand ready to take over if
Ofte of the primary antennas is damaged.
WWV has achieved this e)(celieni on-
line record in spite of nriaior cutba^ts in
fuPKlina. The station had as many as 20
lueopte at onie time, monitoring the e^urp-
m«nt around the clock. Now, thanks to au-
tomated backups, the staff consists of ex-
actly three engineers and a single secre-
tary, all wo/king standard hours. The rest
of the time the entire station is deserted,
except for dozens of fuzzy brown rabbits
73 fAagaiine • April, 1984 121
and an occasional d^r. The entire annual
budget for the statiorf, tncludirg the low-
frequency WWVB, Is about $200,000, and
that includes an electricity bill of about
S6,0OQ per month!
One casualty of the budget crunch has
baen the 25'MHz signal, which was dis-
continued In 1977. It waan t taken off the
air because it cost too much to operate;
the transmitter was needed as a dedi-
cated standby for the other frequencies..
Still, WWV Is one government organtza-
tion which provides an excellent service
for a remarkably small amount of money*
(Next month well look at some of the
of/ier (nontlme) reasons to listen to WWV.
Meanwhile, tune in to 10 00000000 MHz at
13 minutes after the hour.) Don't worry;
well show how this WWV intoritiation Is
vital to successful DXtng In future col-
umns.
DEVIL'S MOUNTAIN
Chiirum-\/ena Expedition. In one of the
more unique DXpedltlons of 1984^ a group
of Venezuelan amateurs will operate from
Devil's Mountain, deep In the heart of Ven-
ezuela. Churum Vena Is better known as
Angel FalEs. At 3213 feet, It is the htghest
waterfall in the world. The waterfall
(named after [ts discoverer; James Anget)
plunges down the side of seldom-ciimbed
Devil's Mountain. The normal viewing
point tor the falls is at the bottom of the
canyon below, but at the end of March and
ear^y April, 4M5ARV^B wlH be on ail bands
from the top. Frequencies are: CW— 3710,
7010, 14010, 21110, and 28110 (Novices
take notef); SSB— 3795, 7095, 14195,
2129&, and 28595. QSL via PO Box 3636,
Caracas lOlO-A^ Venezuela.
And who is that you hear on 15-metef
SSB? VP2ML? Montserrat might not be
the rarest of DX, but I look forward to
working you the last week in March and
the first week In April. QSL via K1RH. 73,
and see you on the bands I
SOCMl
Listings in ttiis coiumn are pmvid&d tree of
c/fSfge on a space-avail sbfe ba$is^ Tt>e fat-
hwfng informatioft shoufd be mciud&d In
every announcement: sponsor, event, date,
time, fniace, city, state, afJmmsion ctisrge ^if
any), features, tsik-in frequencieSf and the
name ofwtiom to contact for funt}er informa-
tion. Announcements must be received by 73
Magazine by the first of the montfi, two
monttis prior to ti^e monffj tn wiiict^ the event
t&kespiace. Mail to Editorisi OtfiG^s, 73 Mag^
a2:lnei Pine St, Petertx^rough NM 0345&,
EVENTS ]
CHICAGO IL
APFt4
FRAMINQHAM Mk
APR 1
The Pram Ingham ARA, Inc., will hold its
annual spring ftea market on Sunday,
April lt I9fl4, beginning at 10:00 am at the
Framingham Civic League Building. 214
Concord Street |Rte. 126). downtown Fra-
mingham. Admissiofi is $200 and tables
are 910,00 (pre-reglstratlon required}.
Sellers may begin setups at B:30 am.
There will be radio equipment, computer
gear, and food inhouse. Talk-in on
147.75/15 and .5Z For more information,
contact Jon Weiner KIVVC^ 52 Overlook
Drive, Framingham MA 01701, or phone
(617>S77'7166.
TRENTON NJ
APR1
The Delaware Valley Radio Association
will hold its 12th annual flea market and
computer show on Sunday, April 1, 1964,
from 8:00 am to 4l00 pm, at the New Jersey
National Guard 1l2lh Pteld Artillery Ar-
mory, Eggerts Crossing Road, l^wrence
Township, Trenton NJ. There will tae an in-
door and outdoor flea-market area, com-
m>erclal dealers, and refreshments, Sell-
ers are asked to bring their own tables^
Talk-In on 146,52 and 146.07/,67. For ad-
vance tickets and space reservations^
p tease send an SASE to Walter L. Sharpe
KB2ZY, 140 Susan Drive, Trenton NJ
0B&3@.
The Chicago Amateur Radio Club wilt
hold an open houae on Wedne3day^ April 4,
1984, from 7:00 pm to 10:00 pm, at Edge-
brook Golf Course Field House, 610O N.
Central Avenue, Chicago IL Everyone is
welcome— especially those Interested in
learning about amateur radio and how to
obtain a license. There will tre a film shown
and live demonstrations of all aspects of
amateur-radio oommuntcations and equip-
ment. For additional information^ call {312)-
54^6622.
ftOCHESTERNH
APR?
The Great Bay Radio Association will
hold its 4th annual hamfest/flea market,
Sprlngfest 'a4, on Saturday, April 7, 1984,
from &:00 am to 3:00 pm, at the Rochester
VFW Post 1772 Hall, Pickering Road, Roch-
ester (Gonic) NH. Admission is S1.00. Food,
refreshments, and plenty of free parking
win be available. Ta1k4n on 147,57. For ad-
vance table resentalions and further infor-
mal ion, write Great Bay Radio Association,
PO Box 911. Ctover NH 03820.
SAN ANTONtO TX
APR 7
The San Antonio Area Radio Club will
hold its first annual Swapfest and Bar-8-Q
on April 7, 1984, from 7:00 am to 5:00 pm,
at Comanche Park. Talk- in on 147.36 WHe.
For more details, write Melvin Anderson,
8932 Saddle Trail, San Antonio TX 78255.
ROCHESTER MN
APR 7
The Rochester Arnateur Radio Club and
the Rochester Repeater Society will spon-
sor the 7th annual Rochester Area Ham-
fe&t on Saturday, April 7, 1984, beginning
at 8:30 am, at John Adams Junior High
School, 2535 NW 31 Street, Rochester
MN. There will be a large indoor flea
MULTI-BAND SLOPERS
160, 80, 40, 30, & 20 METERS
Outstanding DX performance of W9JNM Slopers is well knownl Nowen-
'ioy mulllbancl BIG-SIGNAL reports! Automatic bandswjtching ■ Very
low SWR *Co3x feed ■ 3kw power - Compact - FULLY ASSEMBLED
. Hang from any support 25 ft. high Or higher - Easy to instan . very
low profile ■ Com;)lete Instructions -Your personal check accepted
^BAND SLOPER- 16 0,80, 40, 30 Meters -6011 long S 48.55 trt.ppd
2 BAND SLOWER' SO & 40 Meters ■ 41 H. long $ 35.&g trt.ppd.
3-SANONQTflAP PI POLE, 160.80, &40M- 113 ft. long $ 66. po frippd
g-BANDNOTRAP OiPOLE. aO,&40M > a4ft Jong $ 49. QQ tri ppd
FOR ADDN L INFO on these and Other umque antennas.., ■■ SEND SASE
W9INN ANTENNAS
BOX 393- S MX PROSPECT, IL 60056
market for radio and electronic items ^ re-
freshments^ and plenty of free parking.
Talk-in on 146.22^.02 MHz. For further in-
formation^ contact RARC, cio W. C, Mc-
Gurk WeOYEE. 2253 Nordic Court NW,
Rochester MN 55901.
FLEIiillNQTON NJ
APR 7
The Cherryvitie Repeater Association
will sponsor the annual Flemlngton NJ
Harrifest on Saturday, April 7, 1^84, from
8:00 am to 3:00 pm. at the Hunterdon
County High Sohooi Fieid House on Route
31. General admission is $3.00. For ear!y
birds, breakfast will be available on site
from 6:30 am. Talk-in on 147.375. 147.015.
146.52, 224,12, and 444. S5, For additional
tnfonnalion or table reservations, write
BUI Inkrote K2NJ, RD 10. Sox 294, Quaker-
town-Cro1on Road, Flemlngton NJ 08822,
or call (201 pee 4080.
GREENCASTLE IN
APR 7
The Putnam County Amateur FladEo
Ciub will hold Its second Amateur Radio
and Electronics Auction on April 7, 1984.
at the Putnam County Fairgrounds. US
231, north of Qreencastle IN. Admission is
S1.00, sales commission is 5%, and there
wfkl be a $1,00 service charge on buy^
backs. Doors will open at 8:00 am and the
auction will start at 10:00 am. Bring your
equipment to be sold on consignment. AH
activities wilt be Inside and food will t^e
available, Taik-in on 147.93f,33. For more
information or a flyer, contact John Un-
derwood KSIIB^ RFD 1, Box 10, Hitmore IN
46128.
KANSAS crrv MO
APR 7-a
The PHD Amateur Radio Association,
inc., will sponsor the 1984 Missouri State
ARFIL Convention on Saturday and Sun-
day, AprJI 7-8, 1984, from 10:00 am to 5i30
pm (both days), at the Trade Ivlart SulidIng,
at the downtown Kansas City MO airport.
For both days, registration is $4.00 and
swap tables are 110.00, which includes
one registration with each table. Commer-
cial exhitiitors may set up from 7:00 pm to.
9:00 pm on Friday or 7:00 am to 10:00 am
on Saturday; swappers may set up at 9:00
on Saturday. The Saturday-night banquet
at the world-famous Gold Buffet is S10.SO.
Those desiring banquet tickets and swap
tables are urged to order in advance.
Other features will be a complete program
of forums, commercial booths, a large
fiea market, a home-brew contest, Mis-
souri-Kansas Amateur-of'the-Year and
CW Contest awards , and on Sunday, a
Missouri-Kansas Repeater Council meet-
ing, as well as OCWA and YL luncheons.
Unlimited free parking. Including RV
space {no hookups j, will t>e available.
Talk-in on 146.34/.94. For more Informa-
tion and regi St rat ions^ write PHD Amateur
Radio Association, Inc., Liberty MO 64068-
0011, or call (816^781-7313 or 452-9321, All
pre-registrations will be held at the door.
AMBOY IL
APRB
The I9th annuai Rock River ARC Hanv
test will be held on Sunday^ April 3. 1984,
beginning at 8:00 am, at the Lee County
4-H Center, one mite east of the junction
of 52 and 30. Ticket donations are 12.00
each in advance and S3.00 at the gate;
3-foot tables are $500 each. Camping
space will be available for a nominal
charge and breakfast and (unch will t>s
served. There will tie an auction of am a*
teur-reialed gear. Talk- In on .37/.97 re-
peater. For more information or advance
tickets (available until April 1, 1934) and
tables, write to Shirley Webb KA9HGZ.
618 Orchard Street, Dixon IL 61021, or
phone (815)"284-381 1.
MADISON Wl
APR a
The Madison Area Repeater Assocfa-
tion, Inc. (MARA), will hold its I2th annual
Madison Swapfest on Sunday, April fi,
1&84, at the Dane County Exposition Cen
ter Forum Building in Madison Wl. Admis-
sion is £2.50 per person In advance and
$3,00 at the door. Children twelve and
under will be admitted free. F lea-ma ritet
tables are $4.00 each in advance and £5,00
at the door. Doors will open at 5:00 am for
commercial exhibitors, 8:00 am for flea-
market sellers, and 9:00 am for the general
public. Features will include commercial
exhibitors, a ftea market, an all you-can-
eat pancake breakfast, and a barbecue
lunch. Plenty of parking space and neartiy
hotel acoommodatmns are available.
Talk In on 146.1 6/.76 {WB9AEWR|. For res-
ervations (early ones are advised) or more
information, write to MARA, PO Box 3403,
Madison Vyi 53704.
WySKEQQN Ml
APR 14
The Muskegon Area Amateur Radio
Council will hold the ARRL Michigan
State Convention and Muskeg^on Hamfest
on April 14. 1984, at the L C. Walker Are-
na, 4th ai Western, Muskegon Ml. Fea-
tures will Include Friday-evening hospital-
- ily rooms, programs covering areas of am-
ateur radio Interest, ladles' activities, and
a Saturday-evening convention dinner
program. Setups for manufacturers and
dealers will begin at 2:00 pm on April 13th.
For more Information, write Muskegon Ar-
ea Amateur Radio Council, PO Box 691,
Muskegon Ml 49443.
WELLESLEY MA
APR 14
The Wellesley Amateur Radio Society
will conduct its annual auction on Satur-
day, April 14. 1984, at the First Congrega-
tlonal Church of Wetlesley Hills, 207
Washington Street, at the intersection of
Routes 9 and 16, Wellesley MA. Doors will
open at 10:00 am and the auction will
begin at 11:00 am. Talk-in on .63/.03,
.04/.e4. and .52. For more Information,
contact Kevin P. Kelly WA1VHV, 7 Lawn^
wood Place, Charles town MA 02129.
122 73 Magazine • April, 1984
PIKES PEAK CO
APR 14-t5
Ihe Pfkfs Peak Radio Amateur Associa^
t\on will present tfie 1st annual Electronic
Exhibition and Traide Shew on Saturday
and Sur>day, A|m1I 14-15, 1S&4. iwm lOaOO
•m b> &00 pm, at a site soon lo be con-
nniieiL A tee wlir be charge at ttw door,
WelMmown equ^pmet^t manufacturefe will
present seminars on Saturday, starling ai
1:00 pin, and admb^ion will t>e free. Uve TV
and radio broadcasts will tre on during the
show, TatN-in on t4d^2 simpteic or 146.97/
JACK^N MS
APR 14*15
The Jacheon AmAteur Radio Club will
host ttie Capital City Handiest and 1384
ARRL MJsslasIpp^ State Cortventlon on
Saturday and Sunday, April 14-15, I3fi4, at
(tie Communications Workers of America
Building. (-220 at Country Club Dfive.
Hours on Saturday are 9:00 am to 5:00 pm
and on Sunday. 8:00 am to 1:30 pm. Admis-
sion is tree and Ilea markm tables are
$5.00 each. Attractions Include com me p
cial dealer exhibits, a large indoor flea
market, conceesEons. forums, and free
parking ^Including self-contained RVs).
For special tiamfest rates, contact the
Holiday Inn Southwest directly. Talk-In on
i46.te/,76. For funher information, con-
lacl Carol Kemp NASY^ 3S61 Beaumon!
Drive, Pearl MS 39206, or phone
(801)^9-7612,
Ifalt^QHNC
APR IS
The RalelQh Amateyr Radio Society will
hold lis 12tti annual hamfest end flea mar-
ket (all under cover) on Sunday. April 15,
10B4. t>eg inning at 3:00 am, at the Oratj-
triae Valley Shopping Mali, Focated at the
Intersection of US 70 west and US 1 aruj
&4 Admission 1$ $4.00 at the gate, with no
extra charge for 1ailga!efs. TatHes will tte
ev^iiatiie for rent. Features will <nclu{^ a
CW contest, a home-tirew conlesl. and
special-Interest meetfngs. Talk4n wHi be on
146.04^146.64 (W4DW) and 14a,2d/14&S6
(K4ITI_). For more information, contact
Pete Thacher N4HQZ at p19h87&4073 or
Jim Bradley WA4AOO at (919^951-2437
from &00 pm to 8:00 pm weekdays or on
weeker^ds, or wrtte RARS, PO 19127, Ra-
leigh NC 27619.
DAYTON OH
APR 27
the 15th annyaf 8*A'S'H w*1l be held
on Friday nighL Apdi 27, 1084, at the Day-
lOfi Hariw^nlion at th© Convention Center,
Main and Fifth Streets, Dayton DH. A^
mission is free and parking ts available in
iha adjacent city garage. There will l>e
sandwichas, snacks, end a COD bar, as
well as Mve entertalnmeni. For fufther \i\-\
formation, contact the Miami Valtey FMH
Association. PO Box 263, Dayton OH
45401.
DAYTON OH
APR 27
The Dayton-Clncinnatl Chapter of the
Quarter Century Wireless Association will
fKi^d its annual bar^quel during the Dayton
Hamventiofl on Friday. April 27. 1964. at
Neil's Hefttage House flestauram, 2180 S-
Olitle Drive. Dayton 0>H. Tickets are $1?.50.
The cash bar will open at B:30 pm and din-
ner will liegin at 7:30 pm. Tt^ dinner speak-
er is Dr. Jerroid Petrofsky, developer of
computerized equipmant that enables paf-
aplegics to waik.The pres^itation will tw Il-
lustrated. For more details, write Doug Hor-
nm WQPH. 186 Solfwood Drive, Dayton OH
454^. or call (StS^^^^^BSlO.
DAYTON OH
APR 27-20
The 19B4 Dayton Hamvenllofi's tnterna-
tlonal VHFAiHF Conference will be h^Fd
concurrently with the Ham vent Ion from
Friday through Sunday. ApHI 27-29. 1984.
at ttw Hara Arena end E3thSt>ition t3enter.
Dayton OH. There will Ih technical forufns
Iry acknow/iedged experts; noise-figure,
dynamic-range, and antenna ran^e mea-
Burement contests; and a hospitality sufte
with refreBhmenta. Technical papers and
presentations on VHF/UHF topics of inter-
est ^re being solicited for conslderatioa
Potential speakers Should submit I tieir re-
quests i^mmediateiy. For furttier informa-
tion, contact Jim Slltt WAflONQ. VHFflJHF
Conference Moderator, 4126 Crest Manor,
Hamilton OH 4501 1.
DAYTON OH
APR 27-29
The Dayton Am^ateur Radio Associa-
tJon, tnc., will sponsor the Dayton Hairv
wention on April 27-29, 1984, at the Hara
Arena and Exhibition Center, Dayton OH.
Admission, valid tor all three days, Is S7.50
In advance and $10.00 at the door. The
Saturday evening Grand Banquet and En-
leflalnnient Is $14.00 in advance and
S1&00 at the doo<. Harry Dannais W2H0,
ptst president of the ARRl^ will t>e the
featured speaker. Because seating is lim-
ited, eariy reserve 1 1 ona are requested.
There will be a giant flea market starting
at noon on Friday and continuing all day
Saturday and Sunday. Flea-mafket space
la $15.00 for all three days and will be sold
In advance onSy. Entrance for setups will
tw available starting Wednesday and ihe
sf>eciaJ flea market telephone is fSlS}-
223-0923 Oth^r features will include to-
rums, awards, and exhibits. For apeciaJ
motel rates and reservations, write Ham-
vention Housing, Box 1288. Dayton OH
45402; no telephone reservations will be
accepted. AOdress aM other inquiries to
Box 44. Dayton OH 45401. or pho<ie (513^
433-7720. Please semi advance registra-
tion Checks to Dayton Hamvention, Box
22&5, Dayton OH 45401.
HARTWELL GA
APR 26-29
The An(|«rson, Hart well, and Toecoe
Ha^ Clubs will sponsor the sixth anr^ual
Lake Hartwelt Hamtest on ApriF 28^29,
1984, at the Lake HartweFJ Group Camp lo-
cated on Highway 29, about 2 miles south
Of Hart well Dam. Admission, camping, and
flea-market space are alF free. Aclivities will
begin mt StOO am on Satuiday and include a
howeatioa totmiament and a left-foated
CW contBsL The oamplng area virtll be open
Friday and Saturday nights. Tal*c-ln on
146.895^295 and 146.1 9^.79. For further in-
formation, contact Carl Davis KV4T. 20S
College Avenue. Hartwell GA 30643.
niie
EAST HARTFORD CT
APR 29
seventh annual Pioneer Valley Hadio
Association (PVRA) Ftea Market will be
held on Sunday^ April 29, 19B4, from 10:00
am to 4:00 pm, at Panney HlQh School,
Forbes Street. East Hartford CT. Taik-ln on
J9/:7B. For feservatiqns arKi more Informa-
tkWK write Jon Patz KAlFYt^ 34 Whiting
t^anc. West Hartford CT06T19, or call C203J-
232€772 (evmlngslL
MMNTREE MA
APR 20
The South Shore Amateur Hadio Club of
BraJniree MA will celebrate its 53rd year in
amateur radio tiy holding an Indoof flea
market on Survlay, Apcil 29, 1984. rain or
mirm^ from 11:00 am to 4:00 pm. ai the Vik-
ing Club, 410 Qmlncy Avenue, Brain tree f^A
The entrance fee Is S 100 and 8-loot lables
are $10.00 {which includes 1 free admission
per table}. Vendors will be admitted at 9-30
am and plenty of parking will be available.
For advance lal>le reservations. ser>d a
check payabl« to the South Shote Amateur
Racfio Club to Ed Dotiefty W1 M PT. 236 W^kl-
wood Avenue, Braintree MA 02184, Aconfir-
rrration of check receipt wtii tm sent and
there will t« no cancellation refunds after
April 25. For more information, call Ed at
t517>843443t, svenlngs.
CHJCAGOiL
MAY 2
The Chicago Amateur Radio Club's Eve-
ning Mini^Hamfest will be held on Wednes
day. May 2, 1984, from 6:00 pm to 10:00 pm,
at the Edgebrook Gorf Course Field House,
6100 N. Central (tietween £ 1st on and
Devon), Oioaoo IL Admission is S1.0O and
card-tatile Sfiaces are SlOO. Refreshments
will be available. Talk-in on 14652 MHz. For
tickets, space reservations, or mone infor-
mation, send an SASE to CARC, 5631 W. In
vlng Park Road. Chicago IL G0634, or phone
(312V54&^22.
ST. DAVID AZ
MAY 4-6
Tt)e Cochise Amateur Radio Assoc! a-
lion, Inc., wJII ttoid a hamfest (upgraded
from a swapmeet) on May 4-8, 1984, in St.
David AZ. There will be a flea market and
all tallgaters are welcome. Tours planned
to Tomt^tone. tfie Bis bee lavender Pit.
and other places of imefest. Talk-in qn
.16^.76 and .52 simplex. For more details,
contact CARA. Attention: Bob Clay K87HB.
PO Sax tSSa, Stefra Vista AZ 35^38.
CEDARBURG Wl
MAYS
The Ozaukee Radio Club will sponsor
Its 6th annuat swapfeat on Saturday, May
5. 1984, from 8.-00 am to 1:00 pm. at the Cir-
cle B Recreation Center. Highway 60. Ce-
darburg Wl (located 20 mtJes north of MiF-
waukee). Admission is $2.00 In advance
and S3.00 at the door. Six-foot tables are
52.00 and eight-foot tables are S3,00. Food
and refreshments will be aval Fable. Seik
efs will be admitted at 7:00 am for table
setups. For tickets, tables, maps, ot mo«^
Inforrriation, sernl a business-si^e SASE
to 1384 Ozaukee Radio Club Swapfest, PO
Bo* 13, Port Washington Wl 53074,
COLUMBIA MO
MAY&-6
The Central Mlssoori Radio Association
will fiokl Columbia Hamfest "84 on May 6-6,
1864, at ttie Hltlon inn, 1-70 arxt Stadium
Boulevard, Columbia MO- Features will in-
clude forun^, a hospitality room, a Satur
day-night banquet, a hard-surfaced flea
market, display tables, and shultle-Ous ser-
vtce to parking ajneas and shopping centers.
Talk4n on .1&76 or 220 42/02, For boncfuet
lldkets. reseHTvations for fxJtels, fleanmafket
Spaces, Or dataier tables, and more informa-
lion, contact Ben Smith KiPGK. Route 1*
Prairie Home MO 65068, or phono {8t6H27-
5319.
GREENVILLE SC
MAY 5-fl
The Blue Ridge Arruiteur Radio Society
will sponsor the Greenville SC Hamfest on
Saturday and Sunday, May 5-6, 1964, at
the American Legion Fairgrounds, White
Horse Road, Vi mile north of 1^5, Oreen'
vitie SO. Admission Is $3.00 in advance
and $4.00 at the door. Talk-in on 146.01/
.61, For advancs tickets, write Mrs. Sue
Chlsm M4ENX. Rte, 6. 203 Lanewood
Dfive, GreenviUe SC 2i607. For fiirtt>er in-
formal ton, write Phil fyfuftfrts WD4KTG,
Hamfest Chairman, PO Box 99, Simpson-
vilJe SC 29681.
LONGtSLAND
MAYS
The Suffolk County Rac^ Ovib Indoor
and Outdoor Flea Market will tw held on
Sunday. May 6, 1984, from 8.^ am lo 3;:0d
pm, at Reputs^ic Lodge No. 1967, 585 Broad-
holFow f^ad tr^oute 110), Melvieie NY. Gen-
eral admission Is S2,00; children under 12
and wives will be admitted free. Indoor sell-
er's tables are S7.0O and outdoor space is
tSJOQ Cif¥:ludes one aiiniissiofi). There will
t>e refreshments on the premisa6 and pA&h
ty of free parking. Talk-In on 144.81^45^1
and 146.52 For additional information, con-
tact Richard Tygar AC2P at (516)^43^5956
(evenings).
SULLIVAN 11
MAY 6
Ttte Moultrie Amateur Radio Ktub will
hold its annual Sullivan IL MARK Hamfest
on May 6, T984, at the 4-H Fairgrounds, 3
mites east and 1 mile north of Sullivan on
the Cadwfiii Road. Features include cov-
ered facilities, lunch, and a free swapper's
row. Talk-tn on T46-6fi&.055 and 146^20.
For more Infonnation, contact William
Guennewig WA9WOB at (2l7)^2e&ai39
(evenings).
SANDWICH IL
MAY 6
The Kishv^uKee Radio Club of DeKalb
IL will hold its annual hamfesi on SumSay,
May 6, 1964. at !f>e Sar>dwich Fairgrounds.
Sandwich. Tidtets are S2.50 In advance
and 13.00 at the door; tables are S5,00
each, Overnight camping without hook-
ups will be aval Fab te. For more Informa-
tion, contact Howard Newqulst WA9TXW,
PO Bo» 348, Sycamore iL 60176.
CENTRAUA IL
MAY 6
The CentraMa Wireless Association,
Inc., wIM hold Its annual hamfest on Sun-
day, May 6, 19B4, at the Kaskaskfa College
Gymnasium^ 3 miles northwest of Centra-
11 » IL Admission (o the tvamfest Is free
and there will be no charge for the flea-
market and exhibit space (a limited num-
t>ef of ta&les will be issued on a fifsl-
come, first-sen/e Oasis). Doors will open at
7:0D am for flea market and exhlOit set-
ups. Food and refreshments will be avail-
able, as well as plenty of free parking.
TftUwn on 147^7/.B7 and 14652. Fof fur-
th«r Information, contact Bod Kirrg
WB90EG at |6l8>-532-6606 Of Lou Hodges
WStL at |6l8>-633^?24. or write to CWA,
inc., PO Box 1166, Centralla IL 62801.
PARAMUS NJ
MAYS
Tfie Bergen ARA will hofd a Ham Swap
'n' Sell on May 8. 1864. frofn 8iO0 am to
4:00 pm, at Bergen Community College,
400 Paramus Road. Pa ram us NJ, There
wlH be tall gating only and admission for
seliera Is t4.00 fbring your own table).
Buyers will be admlUed free Talk-in on
.70/. 19 and .52. For more informatton, con-
lac I Jim Greer KK2U. 444 Berkshire Road.
Rid^ewood NJ 07450, or phone {201H4S-
28^.
DUIIHAM NC
MAY 12
The Durham fU Association will hold
the Durham Hamfest on May 12, 1984, at
the South Square Ma^t. Durham NC Talk-
In on 147J25. For more information, write
Milan R Burger, President, DFMA, 5711
$prti>«^ Drive, Durham NC 27712.
I
73 MagBzine « April, 1S84 123
FUN!
John Edwards K12U
PO Box 73
Middle Village NY 11379
HOW HAMS VIEW
THEMSELVES
You can say orie thtng about haims:
They're «H a( alt shy. 6f *ng up an t^avie *!-
fecting our hobby, and hams., like (lo oiher
Sp«c!al4ntfirest Qrotip. are cortaln to «)(-
press ttieir views about U. Raniember Iha
Jack AfKlerson Inc^idsnt back tn tha
1970s? And what abowl no^ode? r ihink it
was no mere coincidence that iha FCC
commissi oners switched from a unani-
mous endorsement of no-code to « po^i*
Hon of unanimous disapproval within ttie
$pan of onty a few mo/ittvs. Tens of Ihou^
ssfKls of letiam fTom concerrwd amsteurt
certainty |>layed a rote^ as did the In*
lluencx of so«T>e frfends in tiigf! plac«$.
Yes, hams love to a* press thetf ¥<ews.
Af)d that's wtty wa take time out each year
to let the FUNT readership comment ofl
the day's important ham issues. One
never knows exactly what form I ha re^
sponses will take, bul there's always lots
of input.
This year, as in preivious FUN! pollsp
we're keeping some old questions In order
to keep track of developing trends in our
hobby arid adding s<»Tie new ones to keep
up with I he times. Whatevef your v^enirs,
sand your responses to PO Box 73. Middia
Village NY 1 1373. Or, if you've given up on
the US. Mule, you can Iransinlt your an-
swers electronically wla CompuServe's
Emali or HamNet. My 10 Is 70007,412. My
Source ID, If you prefer thai system, Is
TCII335.
ELEMENT l-BAQKQROUNO
n Sei^:
A) Mala
6| Fimalt
2| Ag<K
A} 15 or belO(M
B) 16-21
Q 22-3g
Q) 40-59
E) 60 or above
3) License clasa:
A) Novice
B) Tectiniclan
C) General
D) Advanced
E]f Ejctrs
4) Nun'ktMr of years ficenaed:
A^ 1 year or less
B| 1-5 fn^t^
Q 6-10 years
0) 11-20 years
Q 21 years and up
5) Do yoy have a new (poat44arch T€) call?
A) Yes
B) Mo
6} How many hourB a week do you devote
to amateur rad^o?
A) 0*1 hour
B) 2'S hours
C) 6-10 hours
P) 11-20Tiour^
E) 2i noyrs or more
%MV
ORBIT is the Official Journal for the
Radio Amateur Satellite corporation.
For a SAMPLE COPY please
send $2 to:
(AMSAT), P.O. BOX 27, Washington, DC
20047.
7) Which HF band do you u»e most?
A] fi0^7S meters
B} 40 n^ers
C) 20 meters
D) t& andtor 10 meters
6 Don't ofwrate HF
3} Which VHF4JHF band cfe you lise most?
A) & maters
B) 2 meters
C} 220 MHz
D) 420 MHz andJor up
E} Don-t operate VHF-UHF
^ Which mode do you use rnost?
A» sse
B) CW
a FM
€) other
10) How much money have you sperrt on
amateur rad^ wtthin the past year? (In-
clude QSL expenses, magazine subscrip-
tions, c4ub dues, end other incidental eN>
penses.)
A) 0-$25O
B) S251-S500
C) $501-11,000
O) SI. 001 -$2,500
£) $2,501 and up
ELEME^2— SOCIAI.
CHARACTERISTICS
11) Has srateur radio influenced your
cajraif efiokMi?
A> Greatly
B) Sornewtiat
q Not at ail
12) Should the ARRL get rid of the DXCC
Honor Roti?
A) Yes
9) No
13) Potltically, how would you define
yourself?
A) Conservativa
6) Mlddl&of-thO'road
Q Uberal
iij Should the ARRL gel fid of the OX
Century aub?
A) Yes
8» rto
151 How old were you wt>en you first b*'
came a ham?
A) 15 or below
B) 16-21
C) 22-39
Dl 40-59
E) 60 or abova
16) Should the FCC Increase the speeds
on amateur CW sn ami net ions?
A) Yes
B) No
17) Do you own a Nime compuloi?
A) Yes
B1 No
16) Do you think hamsK compared to ccfn-
puter hobbyists, are:
A) More technically ifictined In their
B) Less leclinlcally inclined in their
hobby
C) Both are about equally akllled In
their hobby
19) Do you think that home computing is
siphoning people (Including youngs tera)
away from amateur radio?
A) Yes
B) ^kJ
20) Will the volunteer exam system \f¥
crease cheating?
A^ Y^
B) No
21) Should volunteer examiners be al^
lowed to collect a fee to help defray ex-
penses?
A) Yes
B) No
^ Has ham radio hielped to make you a
better person?
A) Yes
B} No
Selling 73 w?ll
make money for
you. Consider the facts:
Fact 1; Selling 73 increases
store traffic— our dealers telt
us that 73 is one of the hottest-
selling amateur radio magazines on the
newsstands.
Fact 2: There is a direct correlation between
store traffic and sales— increase the number of
people coming through your door and you1l increase
sales
Fact 3: Fact 1 -h Fact 2 = INCREASED SALES, which
means more money for you. And that's a fact.
For information on selling 73, call 80fr 3430728 (in New
Hampshire call 1-924-9471) and speak with Ginnie
Boudrieau, our bulk sales manager Or write to her at
73, 80 Pine St., Peterborough, NH 03458.
75.
Amateur Radio's
lechnicalJournai
80 PIfve Street Ptterborough, NH 03450
800-3430728
124 73 Magazine • April, 1984
RESPONSE FORM
instructions: Bead eacli quddlton a^ mark your response try cfrcllng the appropriate fettef fvext to Itw numtMf of Ihe question.
Etement f :
DAB
2) A e C D E
3) A B C D E
4) A B C 0 E
5) A B
6) A B C D E
CftfniTiMil^
7) A B C D E
8) A B C D E
9) A B C D E
114 A B C D E
Bi^m^nt 2:
11) A B C
12? A a
13) A B C
14) A B
15) A B C D E
16) A B
17) A B
1«) A B C
19) A B
2C^ A B
21} A B
22) A B
23) A B
24) A 8
EienmntS:
25) A B
£6) A B
27) A B
2Q A B
29) A B
30) A B
31) A B
3^ A B
33) A B C D E
3D A B C D E
36) A e
36) A B
37) A B
30) A B
39!! A B C D £
40) A B
41) A B
42} A B
43t A B
45) A e C D E
49) A B Q D E
47) A B C & E
40) A B C D E
49) A B
50) A B
-
V
23) Should ham tlcQn&eis have a mmlmum
age requir^TTtent?
A) Ye$
8) No
24) StKMjEd tiam^ be subject io periodic
relesting?
A) Yes
fl) Ho
ELEMENT 3— OPERATING HABITS
25) M the users were mtrteted to d^ta
comfTiunlcatiiXi onty (rto phone or CW op-
eration), ^iwQuld you be In favor or a no-
code 220-MKz Digital-class license?
A) Yes
m No
26} Would you be In favor of a no^ode
220-MI-Lz Digital-class ticKet if il permitted
phone operalio^n in addition to data trans-
mission?
A3 Yes
B) 1^0
27) Have you ever used a personal com-
puter h connection with your amateur*
radio activities?
A) Yes
B) No
28) Is it lima to comptelelv deregulate
amateur radio hy having the FCC turn over
aH responslbtty for ham operation to ttte
amateitr communilylf
Aj Ysa
B| No
29) What ifo you think of people who view
pay4el«Hsion services with MDS con-
verters and satellUe dishes that are not
approved by tiroadcastars?
A) They're skunks
B) They're within their rights
30) Should we gel rid of, or reduce in size,
the CW subl^ands?
A) T'l^ft
B) No
31) Do you rhink DX nets have a ptace In
ham radiio?
A) Yes
B^ Ho
32) Do you thbnk nets in ger>efal tiave a
ptace in ham radto?
A) Yes
m No
33) The next lime a ham operates from
space, whicA band stiould he/stw use?
A) 2 melerB
B) 220 MHz
C) 450 MHz
D) An even higher band
E) Shouldn't bother to operate
34) if, while tuning across a band, you
heard a net called "Jammers Intematlon-
al" in progress, would you;
A) Jam it
B) Ignoi'ait
C) Complain to the FCC or some other
organization
D) Listen
^ Join II
35) tt required, could you sotfdty copy CW
at the speed at wfifdi you were licensed?
A) Yes
S) No
36) If required, could you pass the FCC
thecfv test for your license class?
A) Yes
B) No
37) Have you ever purposely operated in
an amaiaur subband you weren't licensed
louse?
A) Yes
B) No
3$) Do you ttiink ttte At^RL affects amft>
teur rwlio in a posilhre manner?
A) Yes
m No
39) Do you ever speah to foreign, non-
Engiisfh&peaking, hams in tt^r own tan»
guaga?
A J Always
B) Sometimes
C) i attempt U
D) Hara!y
E) Never
40J Do you feel yourself competent to re-
place the finals in a tube-type rig?
A) Yes
B) No
41 j Do you feel yourself competent to re*
place the finals in a transistor- type rig?
A) Yes
6) No
42) Do you solder together your own coax
connectors?
A) Yes
6) No
43) Is your antenna system mounted on
your house or a lowcf?
A) Hotise
6) Towei
44) Have you ever designed your own an-
tenna?
A) Yes
B} No
45) What do you think of contesting?
A) Great
B) Good
Q Okay
D) Don'l tilt^ it
E) Despise it
46) What do you think of DXing?
A) Gfeat
Bl Good
Q Okay
D) Don1 ttke it
E) Despise il
47) Whai do you (hrnk of repeat eftt?
A) Great
B) Good
C) Okay
D) Oon'l like them
E^ Despise them
48) What do you think of traffic hsndling?
A) Gfeat
B) Good
CI Okay
D] Don t like it
El Despise it
49) if you heard an emergency net in prog-
ress, woufd you Immediately join in and
offer your services?
A) Yea
B) No
50) Shouid all hams t« required to join
some type of national amateur-radio or-
ganization?
A) Yes
B) No
47 CFR Pail i7
[PR Deckel Ho. 03-}?; ftM-422^]
Allow ttia Use of Volunteers to Prtpnv
and Admtnlstsr Operator Examinations
In the Amstaur Radio Service and
Correction
aaENCTr Federal Communkatlons
CommiBaionH
action; Final RuLei and Cortecitoa.
ftuitMAPiY: Th\t docunent corrects FCC
niEea regAiding the use of voluntary and
uncompenaated voliinteera to prepare
and adminisier amaieur operator
exaOLUiahciiii m order to eliminate
unLntended inRonfiBtencies in the ni!e»
adopled in the Report and Order in this
proceeding,
EPFECTIV1 OATi; January 11. 1984,
FOR FUPtTHin INFOflMATfOM COKTA^lf
John ], Borkowekl Federal
Cammiinicaiiuna CommisBion,
Washington. D.C 20554. (202) 632-4964.
Effata
Id the matter ofdmendmenl of Parli 0. 1
mmI 97 of the C4itUT3JBiic:^fi'e ni[e« to aIIoiw tlliB
of votynfeert to prepare and adjninjjtef
I tar exjurLinilionA in tiic Amateu; Radio
Service {V% Dw^ket N<^, 83n-27 RM^1229),
1. Qa Septeml»er 22, ]S83, the
Conuniftiion adopted a Report and
Order. 46 PR 45653 (October 6, 1983). in
lilt ttiove captioned proceeding, tn the
Btpoft and Order, the CammiMiaii
■mended Parts 0, 1 and 97 oHts Rute* to
allow the use of vnltinteera to prepare
and administer operator examinstiona
in the Amateur R^din Service.
2. En the nties set forth in i)ie
Appendix to ihe Report and Order^
voiunteeri are given ten days from the
time ihey administer an examination to
forward candidates' applications to the
VEC (! B7.2a(hl). However, VEC's are
given only ten daye From the dale of t)ie
examination to forward candidates'
applications to tlie FCC (§ 97.519(0)).
Thii could result in a VEC having no
timfl to perform the funcdons listed in
I 97. Si 9, and was not intended. The
Com mission intended to give the VEC
adequate time to perform these
fttnctionf,
3. Al paragraph 28 of the Report and
Order, The Commission aiated: ''. . , we
have incorporaied all of the presenl
lelegraph requiremenlB and guidelines
from our present rules/* With respect lo
Iclcgraphy examine lion grading, rvo
changes were intended. However^
I 97.29 (c) in the Apper^dix imposed an
additional burden not included in the
pHitenl rules of grading on the hasii of
'^one continuous minute^-" Inciuiion of
(his new burden was not in I ended .
4. Section! 97.503 and 97,515 of the
Rules in the Appendix cro^s-reference
I 97 JO. There is no 5 97. m The a-nsft-
reference* should be debled^
^ Section ^7.2a[i][2) provides for FCC
relefiting of any person who obtained an
operator ilcensu Ihrough the vt/Iuntti^er
ixamination process. It doea net
indicate what the FCC will do if hucIj a.
person does not pass the examination.
This was an inadvertent omission.
Therefore, we are adding a new
parngraph (j) to § 97. Z& to clarify that an
«3Uiminee who fails to appear for
readmmfstraticiT) of an examination or
who faih to pass the retested
eJcamination elemenl[^) wiU hove hll/
73 Magazine • ApfiU984 12S
her Dpcratofa licence cancelled and wilt
be issued a new operator license for the
operator license dats previously held bf
the examiflee^ We are alia clnrtfyuig
that FCC reieiling applies only for
examinationi abov« the Novice Claftv.
d. AddjiHonsHy. the deTinition of the
term "Amfileur Code Credit Certificaie"
in 1 973 was inadvertently reiained.
7. Pinaliy. the wqrdja|[ of 9 d7.513
regarding where VEC's n^y coordinAte
examinAtioni is unuitenr^ooaUy
ambiguous. White th'm wording w«j
d^i^ed to permi! VBC'i to coordinate
examinations outiide of iKe regions
Esled in 1 97 507(b) jsuch as UnUed
States military bases m foreign
countries), it wis nol intended to pennit
one regional VEC to ec»eirdina1e
examinations in another rcgioo-
& Accofdiqgly» the fotlowiiig
coTTef^ion* tfv made to the Apptf^jx of
the Hep^fri and Ort^r io this pmcsading;
ItfJ fConvdMl
1. Paragfaph (aaj of ft? J is removed
and rwervtd
Z. Section 97 Z$ is smended by
revising p«ra^a|i|i^ I ) and adding a new
^■sfDtkwt:
iwfm
[i] The FCC Teserves the tt^t without
qualiEicatioa, lo:
11) AdmmiilFT eKimtnations itsdf: or
[Z] Keadmmister eKaminations i tielf
or under ihe supervision of an examiner
designated by the FCC to any p«r>on
who obtained en ciperator bcenie above
the Niivice Class ^m>ugh Ibe v olunleer
examination process.
(]] If a licensee fditi to appear fof
re administration of an examindftoa
pursuani lo parsgraph (i}(ZJ of (Mi
■ecttoiL or does not sucxesBfuOy
complete the examination elenient(sl
which are readmmislered^ the licensee't
operator license b tub I eel to
cancellatJon; in au instance of such
cancelation, the licensee will be issued
an operator license cansistertt with
completed examinution elemenls which
have not been in valid a led by nol
appearing for or falling rendmln is t ration
pf an examinotion.
3. The words "for one conlinunui
minute*' are removed from the firs I
sentence of pnragiapb |c) of S 9?.2§.
4. The crtsfl-relereniej lo ( 97.30 are
removed from § 97.503(b} and from
§87,515.
5. The first two ientfinceu of ft ff7.513
ore revised to read:
§B7.fl3 Sctiedullng of examlnalkonL
A VEC will coordinate the dates and
times for schedding exami nations (see
|fl7.Z6} throwghaut the reglon(s) it
serves. Any VEC may also ooordtnnle
the scheduling of testing opp<jftunities
outside of the regions listed in
$ g? J07(b}.
• « • i 4
G. Paragraph [c] of § 97.St9 Is revised
lo read:
m ■* # * *
{c\ Porwird the appllcatton within ten
days of its receipt frfim the eJiamlnem
Lo^ Federal ComRiintk«Hon«
Commissi otx Licensing Division. Private
Radio Bureau* Gettysburg Pennsyivania
17M5.
fSecs. 4(t} and 303 of ibe CofmnuBkiatiani Ad
of li^. mm aiMiMlecL 17 US.C. 151{iJ smt 30:1)
Secrvfoiy.
«7CFRP»rti7
IPR D«*et NOk I^M4; ¥CC 14- 1«]
Making Ackimofial Fr*qiMf>d«i
A¥tllal>^ to th« Radio Amattuf ChrU
Emargwicy Safvtca Dwrfrig Daciartd
Hatlonai Ein«fg«nci««
aacmcy: Federmi Q^mmiinicaiions
CommiBsion.
ftCnoic Final ruk*.
126 73 Magazine • April, 1084
tUMMAftv: Thia document amends the
Amataur Radio Service Rules to make
additional frequencies available to the
Radio Amateur Ovil Emergency Service
(RACES) during dedared national
emergencies- Additional RACES
frequencies are needed sin^e. even in
peace Ume. the number of RACES
frtt<|uefvcies are inadequate. The effect of
Ihia action ia lo assure ihat sufficient
RACES frequencies would be available
tf the President invokes the war
emefgeni^ powers,
tFPlCTiva date: March 26» IflM.
Federal Conmmnicatiocia
Commission^ Washington. D,C. 20554
poii RiRTMEFt mfomumom cowtact:
liastrice f- HePont. Private Radio
Bureau. Washington, D.C 20554.
List of 5^bj«ctt tfi 47 CFK Part W?
Cirtl de&nae, Defenae
communicallaQa, Radin^
Repdt and Order
fa] the msttei of smeiidnmit t^ the Amstets'
Radk) Scfvice Rules, Fart P7, la lAoke
tfJ4^*f^?i"f fracpacndes sviilsbSe tc th« ^idio
Affsitw QvCI EfflETgieQcy Service during
dedsnd lutioiial iiiisusiirtes (PR
NcLi3-524)H
Adopted Isnuary IE 19iC
Released; lanaary i^ l^M.
By Hbe Commission.
t.f>n May % 1983^ the
adopted a Notice of Pti^KMed Rtila
Making (48 PR SmtT-. Jmm% li63)
proposing to maJ^e addiuonal
frequencies available to Ibe Radio
Amaleur Civil Emergency Servica
(RACES) in the event of an emergency
which causes the President to Invoke
certain war emergency powers, pursuant
to Section 906 of the Community tions
Act of 1994^ as amended. Also proposed
were operatignal limita lions on the
additional Frequenciee so ai to provide
protecticm to the Government
Radiolocation Service , to (he
Aeronautica] Radinnavigatlon Service
and to Canadian radio itations. The
restrictionfi that limited RACES
operations to thirty days and to specifjc
geographical areas were alao proposed
lo b« deleted. Nineteen comments were
filed in this procoeding-
2. This proceeding originatAd In
response (p a request from the
Departmeol of Defense (DOD). through
the National Tekcommimj cat ions and
Information Adminiatrabon (^f^A} and
the Interdepartmental Radio AdviBury
Committee [IHACh for addiUonol
Frequencies for RACES stations during a
declared natinnal emergency. DOD had
reviewed the role of RACES in support
of civil defenae activities during a
national emergency declared by the
President and had concluded that
additional RACES hrequenciea are
needed under waf emeigeOiC^
conditions. DOD said that linco the
presently available RACES frequencies
have proven inadequate in peacetime,
ibey would be compkta^ tmsa tufa dory
in wartime. In addition^ DOD noted that
although the number of amateur radio
repeater stations have increased, they
operate on &e<q(Kndea which are not
now available to RACES Henoe. DOD
wanted the frequenciea that lepeatefi
operate on mad€ availabte to RACES
atationa. For the tame reason. DOD
asked that frequencies used by hi^
frequency (HE] nets also be m^d*
available to RACES s tatkniL Tba
deletion of the rettridkin on tlie use of
certain RACES frequencie* to the LDltiat
W days of the emei^encgr and lhe«t«fta
ivlieie they could be uwd was pmpgaed
ctecc those resthctloita are no longer
needed.
3. The comments generally supported
the prapoaal to make additional
frequencies available to RACES
stations. ' Robert N. Dymff wanted all of
* The Utc-ri3«d eoBMPwri of Tdhn A. CarroU «r*
•cnpHiMt ^Ui hflve been conttdend iiwofBi^ *■ tb*f
tttoto le Ms fftKcniiiafl,
the Amateur Radio Service frequencies
made avaHable to RACES. He also
suggested that the RACES rules should
be delete in their entirety and replaced
by a joint working amngement between
the Federal Emeigency Management
Ageni^. State Office* of Emergency
Services and local organixatlons of
amateur radio operators, The
BtiggestloRi of Mr Dymff ore so broad
ai lo exceed the scope of this
proceeding, in our Notice of Ptopoaed
Rule Making, we propoaed to maiie the
frequencies 149^14a MHi amikye for
RACES oparBtinns. Seirenl of the
commenters, however, stiggeated that
the repeater subband 144.50^14&^ MHz
be included lor RACES operation, tn thia
connection^ the American Radio Relay
League. Inc. ( ARRL) ttated that this
would makf it unnecessary for anyone
to oiler esasting equipment. especiaUy
Wpaitflra. to operate on RACES
frequencies dukng a declafad
emergefkcy^ since Amateur Radio
Kmergency Servica lARES) membeia
could switch froES ARES to RACES
immedialeiy without a shift m
equipmi«it*
4 We referr^ the matte? of inct using
the aubband 144.50-145^0 MHz to DOD
(ihrough [RAC], it ifttefposed no
obJAdian Tht^relore, since in<:lu:sion oi
Iheaa ftequencteawUl bring more
ge|ie«teii inio RACES operation and
wiU expand the potential for use of
RAC^S statioms in the hrltEi*. we wiU
include the 14*JO-H5.^ MHz pubband
tn these fmal rules. Some commenters
tuggatl^d that additional h^uendestn
the S. It). 40. and 7&'meier bands be
added for RACES operations. Thoae
frequendei wort not Included in DOO"b
original rvquesl. Therefore, we have not
induded them in these fmol rules.
5. In OUT proposal, we stated that
addltonal amateur radio frequencies in
the 10 MHje and W MHi fiequency
bands might also be considered If the
Uniled States ratified the flnal acts of
the World Admtniitralive Radio
Conference (WARC). IfiTS. Although
such rEilification took place on
Seplember %. 1963, it would not be
appropriate to include those frequencies
in Ihifl Report and Order since the
Amat<,^ur Rules have not yet been
amended to make those bandi available
for use in the Amateur Radio Service on
a regular basil.
e, We will adopt the rules as
proposed, with the inclusion of the
additional 2-meter hand frequencies,
The thirty day hmitaiion on the use of
the frequencies Is deleted since the use
of amateur frequencies for RACES
would undoubtedly be authoriited
beyond the thirty day period if an
emergency continued beyond that time.
Also, we have deleted the geographic
limits lions smce to retain them could
hinder emergency co mm uni cations
between the continental United Slates
and the Slates of Hawaii or Alaska^ or
between the continent a 1 Umted States
and US. possesiiona. Theso latter
amendments are in keeping with our
continuing afforta to eliminate
unnecessary rules and restrictions.
FinAily. necessary correctiona have been
mede to the table in | 97.1g5(b).
7* It ii ordered, that Pitrt 97 is
atiiended as set forth in the Appendix
beftto. This action is taken pursuant to
the autiiority contained in Sections 4(1)
and 309|r) of the Communi cations Act nf
1834. as ainended. Il Is further ordered,
that these rule amendmrnts shall
become effective March S8.. 1964.
gv it is further ordered that Ibe
Secretary shall cause a copy of iMi
Report and Order to be published m the
Faderal Reglater.
v. It La further ordered that this
proceeding is lermlnaied.
IQ. loformation in thts matter may be
t^talned by contactmg Maurice I^
DeponL (302) 63Z-I98i Private Radio
BureaUr Federal CDmmunicatiom
Commission. Washington. D.C 20554.
Federal QonununicAlliaiu Coromisiioll.
WHUam 1^ TricsriQi.
Appendix
PAirr 97^AMEKDEO|
Part ©7 of Chapter I of Title 47 of Iht
Code of Federal Regulations ta
amended as follows;
1. Section 97,185 is revised to read as
follows:
I f7.ft5 Fr*(|i,f*<Kl#s
[a] All of (he authorized frequencies
and emissions allocated to the Amateur
Radio Service are alsn available to the
Radio Amateur Civil Emefgency Service
OD a abared basit.
fb) tn ihs event of an emergency
which necessitates the invoking of the
Pt^dent's'War Emergency Powert
undex the proivisinns of 1 603 of the
Cammuni cations Act of 1934. as
■mmded unless otherwise modified or
directed RACES stations and amateur
radio station! participating in RAUE#d
will be limited in operation to tbe
foliowin^
FREQUENCY OH FREOUENCY BAHOS—
Continuadi
1*^
TBO-tl
T#T5-2000 .
39X-3SH}^.
7215-725$.
50 35-^73,
53,30.
BWt^V^vL/SI irniiiailBiBliK H 1 1 | I ■ m W PTP^T^WI^P^^
iBiMiMhliliait i Hi II II
IP ■ II I^Mlil lllliU
14J 50-1*5.71^
14S-t« ,._„
tX-^SO
,*M*^|MMriir|rii.ll.H — NI«iB»MM*irfHM
23BO-245C!
^•tft^rwrmmlr
[t] Umiiaiions. (1) Use of frequencies
in the band 1975-2000 kHz is subject to
the priority of the LORAN system of
radionavigation In this band and to the
geographiceL frequency^ emission, and
power limitations contained In |97,Q1
(Subpart C of this part pertaining to
Technical Standards).
(2) For use in emergency areas when
required to make initial contact with a
military unit; also, for communtcationa
with military stations on matt era
requiring coordinstion.
(3) Those station! operating in the
bands 420-450. 1?4IK>1%I0 and £34K>-2450
Have you
found
page 224
yet?
h^Hx ill ill not cause harmfii]
Interference to. sitd must tolerate any
fnttrfsrence from, the Covermnent
Radiolocation Service: and also ihe
Aeronautical RadmriBvi^atioTi Service io
the cmm of the 1240-1300 MHz band.
f4j TTtote ilations operating in the
hmnd 220-224 MHz ihalJ aof cauM
bimtifitl interfefencs to, and mu»l
tolerate any interferetice from, the
Govemment RadjolDcation Service tintU
Unumry h 1990, Additionally, the Fixed
and Mobile Services shall have equal
right of opera ti on.
(5) In Ihe band 42&-43{) MHz. no
fliDtion shall operate North of Line A*
Line A boglno el Aberdeen, WdiihJngtont
running by great circle arc to the
inlerijcctlon of 4e* R, 120' W.. J hence
along parallel 48' N., to the inlerseciion
of 95' W.. thence by great circle arc
Ihrough the louthemmost point of
DuJuth. Minn,, thence by great cir^ie arc
to 45* N.. as* Wm thence southward
a]on;g oieHdlan 85' W.. to iLi intersection
with paralkt 41 'N., thence along parallel
41*^ N^ to ita intenection with meridian
B2* W^ thence by great circle arc
throu^ the ■outhemmiiti point of
Bangor, Maine^ thence by greet circte
arc through the touthemmoet point of
Searsport. Maine* at which pomt it
tenninatee.
[6] in the band 42CM50 MH± and
within the following areaa, the peak
envelope power output of a transmitler
used in the Amftteur Radio Service ahaU
not exceed SO wutta, unless expressly
authorized by the Commiaaitin after
mutual agreement, on a case-by-caae
basis, between the Federal
Communications Commission En^ineef-
in-Charge at the applicable District
Office and the Military Area Frequency
Coordinator at the opplj cable military
base:
(i) Thofte portion! of Texai and New
Mexico bounded on the south by
latitude 31' 45 North, on the east by
longitude 104' 00" West, on the north by
latitude 34^ 3Ct North, and on the west
by longitude lUT W West:
[ii] The entire Sttite of Ftoridd
induding ihe Key Wet t area and the
areai enclosed within a 30Q-mile radiua
of Patndt Air Force Base. Florid a
(latitude 26' 21^ North, longitude SG* 43'
West), and within a 200'Tnile radius of
Eglin Air Force Base. Florida {latihide
30* 30' North, longitude se' 30 West};
(ill) The entire State of Attzona;
jiv) Those portions of California and
Nevada douth of latitude 3r 10' North,
and the areas inclosed within a SOO-mile
radiua of the Pacifjc Missile Teal Center*
Point Mug^, Califomia (latitude 34' 09*
North, longjfude lir It Weit).
(v) In the State of Mafsachtisetts
within a 160- kilometer (lOQ mile) radiua
around loc^doni at Otif Air Force Bese.
Massachusetts (latitude 41"^ 45" North,
longitude 70' 32' West).
(vil In the State of Cahfomia within a
2404iIomeIer (ISO mde) radius around
locatlona at Beale Air Force Base,
Cahfomia (latitude 39* 06' North,
longitude l2l' 2& WesI).
fvii) In die Stale of Alaska within a
ISQ-idbiiietjsr ft 00 mile) radius of Clear,
Alaska (TBtihide64' 17' North, longitude
149* ID West). (The Military Area
Frequency Coordinator for this area it
located at Ekuendorf Air Force Base«
AluslcaJ
(viil) In the Stale of North Dakota
within a leo-kilomeier (lOO mile) radius
of Concrete, North Dakota [ latitude 4fl'
43' North, longitude 97" &4' West}. [The
Military Area Frequency Coordinator for
this area can be contacted at: HQ 5AC/
SXOE. Offutt Air Force Base, Nebraska
66113.)
LETTERS
PET PEEVEp CROSS LINK
]
WtUKZ's artlcJe ("Breakthfouoh 'o Bos-
ton: The Birth of Gross linking,'' 73. Janu-
Afft 1964| provides mB witti an opportunity
to »kr a pat paave atxtut wiring diagrama
afiown as achafnatica.
A drawing such as shown In fig. 1 of
David" a article rrtay De 900d to use vvhite
wiring the unit, t>ut a "flow^t-informa-
tion'' type o< dTAwmg would totter hoJp
trie reader umSerstand what the writer is
saying.
Ttiit ii an excellent article, doing Just
what 73 does b^sl^-hfoaking now ground
Kesp op the good woric,
W. S. (Bill) Kfrmper W4KOf
Miami FL
Your commenis make se/iae, 0//^. tut to
avoid drawing two diagrams t think that a
cfrcuit dssurfptfon a fa good oid BSP (Betl
Syst&m Practices} would msko tettar
sensa. That way we need show only the
wiring diagram (most necessary}, i have
written soch a cifcuit description for the
crosstink fogic tHtx. {See beiowj
I nati&e that in mdrawiifg the eircmt you
found tfte error in ttw onginat drawing
with th9 article. Pin 9 ot RYl dbM NOT
connect to thm microphone Cir&jit as
shown txjt. instead, should connect to tfta
top of ttm ooii of fiYI, contad J 3.
Thank you ¥ery mitch tor ymtr insigfit,
mH—OavidP. Aiien WTt/XZ
CtfiCUfT DESCRtPTIOH
When connected as shown in fig. 2 artd
turned on with both rigs powered, the cir-
cuit defauita to receive mode (n both
transceivers. Signais normaiiy wouid be
hearth via externai speakers (not shown}
paratfeiing ttie externat speaker circuits
for each rig. None of tt)e LEDs wiii t>e iiiu-
mine fed.
Wtten micfophorte PIT swH<^ fa
c/oaad. ground pin t of RY3 fs grounded
through D6. opmrntkig fiY3, flY3 corftacts
4 mntS 8 cfose, /ffi/minatiftg LED2 ro indh
cafe microphone "^on" condition. PTT
gmand is pessed through normaiiy-
dosed comaas 3 and it of RYt end f^Y2,
keying ttQih transceivefs Hotmafff-
closed contacts 2 and W of f^Yt ar>d f^Y2
feed microphone audio info &oth trans-
ceivers. When the microphorw i$ re-
f eased, default receive mode Is restored
and RY3 reieaseSr
from defeutt condition^ If SX1 ta
pressed to dose contacts 7 and E and 4
and 5 {HF listen, VHF xmit}, then the
following takes place: Vqg is f^ through
normally-closed contacts 4 and 6 of RY3
through contacts f and 2 of SX1, through
normally -closed contacts 1 and 9 of flfVZ
ro ttte coii df flVS!, &nce 02 is forward-bi-
ased by Vcc through fi4. Q2 ads as a
dosed switch between emitter and coitec-
tor. providing a ground for RY2 coii. RY2
ofieraies and LEDt is iituminated. Con-
tacts 5 and 9 dose on HY2, providing
iatchiftg voltage forBYZ arHfRY2 remains
operated when SX1 returrts to rteutral
Ctosed contacts 7 and 11 of BY2 provide
keying ground tor ttte VHF rig artd closed
corttacts 6 and tO of flY2 feed Hf speaker
audio into the microphone input of the
VHF rig. C2 provides ttoiding voitage for
RY2 white contact B Is traveiiing from con-
tact 1 to co/ttact 5.
//, 3t this point, microphorte PTT switch
is ctosedf RY3 operates opening contacts
4 and 6 of RY3. thus releasing RY2, Simui-
taneous locaf keying of both rigs will fol-
low as described above.
if instead of iocat microphone PTT key-
ing, SXJ is thrown downward, then ffte fol-
lowing se<juence will happen: Closed con-
tacts 5 and 6 of SX 1 remove the forward bi-
as from 02. Thts opens ttte circuit be-
tween emitter and collector ot OZ open-
trig the ground circuit of RY2^ and RY2
drops open. By process descrfbed attove
tor operation ot RY2, RYl rtow operates
and audio is transferred from the VNf
speaker output to the HF microphone in-
put^ If SXT were pressed upwards, then
contacts 4 artd 5ofSXl would cause Q1 to
op&n the ground circuit of flfVJ, dropping
RYl as RY2 operates. Thus signals maybe
transferred from rig to rig by the iocat op-
erator by successive reverse operations
of SXT. LEOI and LED3 wilt show the cur-
rent status.
EXTRA PANE RELIEVER
I've read KCSDU's anicfe. "Instant Pano
Refier* (73, January^ 1964), and I believe a
few follow-up coowThants are needed to
roynd out the article.
KCSDU stated that one of his goals was
to produce a weatheftlQht and fn^ect^ight
assembly, Having wo^'l^ed most of my
adult life In the building-material irvdo$try,
I t>eiieve i have spotted an oversight in hit
reasoning.
Gary described an efliclent system for
makin§ a wealhflftiQht seal as iar as It
goes. However, tt^ article failed to men-
tion tha^ raising the saah breaks ti>e
weatherseal between ttw top and bottom
saahes of the wfn^Jow.
To fix this problem, samel hing haa to
besHd In between the overlapping top and
bottom sashes to seal the gap created by
separating the sashes. FIbergiass insula*
tlon or sponge rubber come to mind to do
this. If a storm window la mounted on the
prjme window, don't fofget to seal be-
tween those sashes, too. A piece of
weatherproof tape placed across the gap
should resolve the storm^sash problem.
JafiMS C. Burtoft KC3HW
Waahingtofi PA
WEST INDIES THANKS
On tsertalf of the Tr'inidad and Tobago
Amaieur Radio Socl«ty« I would like to ex-
tend our sincere thanks to you ar^ 73
magazine for the booka, magazines, and
tapes you so generously donated for wse
in our WCY exhibit. All of Ihe materials ar-
rived In good condition and In time for the
exhibition. They were atl used in our publi-
cations exhibit and helped to ilJustrate
to our visitors what a wett-organized and
well supported hobby amateur radio is.
Our exhibit was visited by several thou-
sand pefsons, many of wh>om had never
even tieard of this holidy before liie deftv
onstration radio stations made about
1000 contacts during the weeklong exhiM-
tlon on tt>e various bonds, on SSB, CW,
and RTTY The exercise turned out to be a
very successful public relations one and
we have added about 40 new associate
n^emt>ers as a direct resutt of it. Many of
ttiem have Joined the training courses
presently befng conducted in preparation
for this year's amateur-radto exam. The
materials you prcvlded have been passed
on to those responsible for the training
course, and Ihe Morse-code tapes should
prove Invaluable to our tutofs.
Once again, thank you for your support^
arid I wish you prosperity in 1984.
John L Webster ty4JW
Trinidad, West Indies
And weicome, 9Y4JW, to T3. (See the Trinh
dad and Tobago column in *73 imema'
tionat.'J—Edttot.
DX WORLD ON THE C-64
Recefved the February, 1964, Issue and
adapted the WB7RLX computer progfam
for the V 10-20 to the Oommodore 64 fPut
tha OX World on a Screen 'j. While making
the necessary chai>ges, I found a few er-
rors that others might correct v^tten typings
Une 1059— DATA omitted
Une 1068— OGEN shouid be OCEAN
Um 1037-SAUDlA ARABIA should to
SAUDi ARABIA (line 1125 has the ccMrect
speihng, but the two lir>es would not cross
ulerence).
My compliments to Gena for a very FB
program. Mine works t^autlfully on my
C-04. I've changed the screen col el's for
better contrast and formatted the s^^reen
printouts to fit the C-&4. Memory re<|uired
la 12,6K, which is no problem for the Cqrrk-
modorei
ft anyone is interested In the C^&4 pro-
gram listing, serMl n>e S2.00 plus an SAS^
a personalized tape is available for $£00 if
you irKlude your QTH's latitude and
longitude.
I towe 111 Congratulations to WE7R|Jt
and to 73!
Bubba Johnaan N4Ci
5043 Victoria AvaAue
l^harleaton SC 29406
LIMELIGHT PROBLEMS
I had to chuckie as I read your laat edito-
rial regarding the impression by otners
that your ego is suffering from overir^lul-
gencel
Ws share the problems ifKl benefits of
being in the timelight and auffoflng acnrtl-
ny by tfie pub41c. Too often our images,
proiected to that pubJic, are far dlffefent
frotn reai life.
1 am often amused by th« reaction that I
recerve when nveeijng new amateurs here
in Indianapolis. There is a sudden '^recog-
nitton*' that flashes across their faces
when they realize that the fellow standing
in froni of them, dressed In cut^ffSt a
T-shirt that touts the ioy of computerized
RTTY, and a much abused hat J a really the
"star'* they see each night on television t
ijjst making an appearance without a
three-ptece suit Is enough to prove that I
am, after all, an OK guy.
I can't count tfie times that newcomers
to my circle of friends have made the com-
ment that t am certainly a tot different in
real life than I am on television. What they
expect of me I have r^ever been able to nail
down, otfier than tr>e fact that they expect
the "image" and rwt trie real pereont
To ttwse wt>o offsf you the adfedlve of
egotistical, you may use Ihis quote— no
cturgal
Th^e are those who do^
and those who don't.
Winners achieve their dreams.
The others lusl , . .won't.
There is certainly a difference: profee^
slonai desire and inner-drlve versus ego-
11 a m^ I believe that your comments over
73 Magazine * April, 1964 127
the monltis have been composed rriDre 03
an iTitet>ded inspirationAl message for
your readers, not mare backs! apptno- So
keep up the good work. If you oan gel juat
or^ or iwo of those beer-guz2llng, televl^
sfofi addtota to reconsider their Iffeatyle,
you *tl\\ nave achieved a worthy ^oal.
For me, each new day lias to be filled
With some tangible achievement
t have the unique opporturtlly of ttaving
mosi o( the day for my persorval piirsuits
and then worfting ai the lelevtaiort station
In the evQo^ngs.
I deoldad at tfie first of the y«ar that I
was going to do more wfiting, a pleasur-
at)4e porQuit t^at I have neglected for
atXHit five yeare. My free Ume needed to
beoome mon«y talcing time.
It took ma a couple of weeks to @et orga-
nized, and Monday I sal down to research
some ideas.
I mailed a laltef to your editorial starf at
?3 this moitiing^ wilti four slory
ideas and found two mofie this after«
noon that took promising,
I had btan wtifking on a computer dala-
base thai provides a Itating of beam head-
ings for almost 600 DX, US, and Canadian
cities. After six months ol hesitation, the
program is complete, and another letter
^111 leave here this afternoon addressed
lo the "Barter *N' Buy" column, Altef all,
why enjoy the results of the labor without
atiaring it with others, at a nKJdest price?
In addfiion, I outlined quefy betters for
ttie kx^l city magazinee for four stories
and completed a much-fieeded giveaway
booklet about Indiana weather for the TV
station advertising sales learn.
By this ilme» you are pfobabty asking,
what's the point?
Tefl peop/e io quft dreaming and start
doifigf
Tell tho^ who doubt your adv^^ce to c|uil
questioning and take act^Or\. The hardest
part of achieving a dream Is the fear of
failure. Failure can at times tM a success
In itseff; ahef all, Columbus salted west to
find The East He failed in hla quest, iKit
his failure proved to be more profitab^
than his original dream!
Cheers, and thanks for Uatenihgl
Bob Foafer WB70WQ/B
wrrvTV
IndEvnapolls IN
HW^ ON 30 AT 2,1 W
t ^ust completed modifying my Heat hk it
liW-6 for 30 meters as descrlt>ed by Kerry
Holliday WA6BJH In your Decemt>er,
19^3, Issue ("A Perfect Match for the
NW-3"). I really appreciate the great job
Kerry did rsaearching and documenting
the modification.
Kerry reported thai the 30-meter output
of the rfvodified HW-a was abtout 1.2 Watts
That seemed tow since my HW4 puts out
a full 2 Watts on 40 ajfd 20. Ttie problem
turned out to be that tt>e mixer output dr-
cutt« L15/CW, doea not reach resonance
when fetuned fof 10 MHz:. As Kerry de-
scribes In step S, a peak output Is noted
when the slug is turned almost to the bot-
tom. HoweverH the rf voltage at the test
point, the emitter of 05. was only atxiuit
QM V whUe the ott>er t>ands produced tie-
Iween 1.1 V and f .5 V. Adding 6B pF kn par-
ahel with the exfaijno C&3 £>< ought the ad-
justment range of lt>e slug within reach of
to MHz, and ■ peak of about 1^ v was
noted- The rf output rose to 2J Watts, wii-
tuaUy the same as on 40 meters.
Incidentally, there Is yet another tuned
circuit at the output of the driver^ Q8. It Is a
very broad-tuned circuit, however, and no
adjustment was provided In the original
circuit. Adding more capacitance to bring
the resonant peak to 10 MHi only in-
creased the powet output by anottier O.OS
dS; clearly this is not wonh the effort!
Again, thanks to Kerry for making the
rrK>ve to 30 so easY!
Iton O^Eau Claire AC6Y
Sam* Cruz CA
S-UNITS ON A PINHEAO?
Regarding VElBZJ's "Ttwnk You. for
Ustenlng" (73, Januarv, I9ft4), he says, "(t
certainty adds a few 5 units wf^en tryfrvg to
make a QSO through the QflM."
One S unll = 4 lo B dBs; 2 S units = a
couple. A few S units would seem to be at
least 12 to I6d&s. Most S-metera react to
peek povver, not average power. Can you
have BZJ expiein how his "expander" in-
creased f>eak power by a factor of 40 or
so?
UCXill.
A^XMasaa WSV5R
NMiOfttsm LA
llMve m>t actuafff b^sfi abt9 to counf th€
S tinftsBt ihe distam statioft ami couid on-
ly go fey fhe rspofts mceiwd tfom Ihe otfi-
or stations which confirm that rny signal
Is not vopyabte without ths oomp/e*-
sorf&xpander unit turned on.
Vte ^tatsmenf concerning "a hw S
units** was tigvrBJlvefy writtm to convay
tfw point thMt tho sfgnm! d09S get en*
hanced- Since ff»fs ts 9 t^chnlcai ioum^i
and Bfttcii^, i mill not was^fs youf time and
mine in expiamtng semantics^ It wou/d be
more eniigntening if the mader experi-
fn€ffted with the unit rathm than nit-pick-
ing the literary style or choice of words oi
the article.
t am hoping that someone else wlif
build the unit and then perhaps I could
judge for my self, and from my end. the ex-
act numt>er of S units that make fhe differ-
©free. — Dennis P. Sladen V£}&2J.
DR. DIGITAL
Robert Swirsky AF2M
PO Box 122
CedarhurstNYlJSte
THE END OF AMATEUR RADIO
Nothing has prompted moire argument
among hams than the issue of noooda li<
censes. Many feel that the code require-
ment is what keeps the emateur band cM-
liisd It has bean argued tt^at tt>ecodeiathe
oniy thing ttiat keeps iaroa numbers ol "un-
desirables" off the afnaieuf bands; without
rt, we would haw chaos.
For some maso€\, many hams waivt to
make It extremeiy difficult 10 obtain a li-
cense, and a MorBe-code requirement ful-
fills this need nicely. Apparently, those thai
take this position don't seem to realize that
a large ham population is In the t»est inter-
est of amateur radio. With a large and ac-
tive tx^dy of hams ttiere could be more ama-
teur-radio^ated b^tsiness, A^o, other sv-
yices would be les^ likely to want a piece of
our aifeady<]irniiiished portioo of ^ye radio
aped rum.
In New Yorit, ttie FCC now gtves ham ex-
ams quarterly. This is hound to discourage
many people from gelling theJr tick-
ets—something aure to please those who
want to restrict the ham population. The
way I see It. this could easily cause the
amateur-radio service to disappear. As
Osirtd Byrne said: "Watch otft— you mlohl
gel iMiit you^re after,"
PACKET RADIO UPDATE
The riewest amateur-radio frontier ta
packet radio. Interest in this mode is stead-
ily growl ng^ although slowly.
A few months ago, i mentioned SLAPR
Protocol, the St. Louis Area Packet Radio
Club's newsletter. The r>ews letter la r>o
kxiger beihg pubiisbsd, and ttie gmup is t»
Ing reornanued M you am in the St LjOU^
area and want to get rnvotved in packet rw
^a ttieiT new address is:
• St. Louis Area Packet Radio ^LAPf^
q^o Spetice Branham KAdlXl, 9926 Lewis
and Clark, St. Louis MO 63136.
St. Louie Is certainly not the only area
where packel radio Is thriving, if you live
near Tucson, Vancouver, or Menio Park CA,
you will find the following groups useful:
# Tucson Amateur Packet Radio (TAFR^,
PO Box ^^88, Tticson AZ SS734.
eVanoxnier AmateiH' [>igit«ii Corrmunica'
Itena (VADCXi db Don Oliver VE7AOG, 818
Rondeau St.H Coqurtlam BC V3J 5Z3, Carv
• Pacific Packet Radio Society iTPHS), cto
Hank Megnuski KA&M, 311 Stanford Ave..
MenIo Park CA 94025.
NMROWBAND VOICE
MODULATION, REViSITED
A ffW years back, there was muc^ talk
about a ''new" mode. The Amerkan Radio
Relay Laague tfKXight this mode (which in
my opirviofl was just a fancy speech pr^
cessorli was so important that they devot^
ed a chapter to it In thelf annual Hand-
book. II never did oatch on^l suppose
NBVM went the way ol quadraphonic
sound and other similar technological
"breakthroughs."
Now that computers have entered the
ham-radio scene, there Is a iow-cost way
to have extremely nairowband voice sig-
nals transr^ttjed over the air. What's
more, this te^mlque only takes up 170 Hz
{I) ol bandwidth and Is legal in the CW por-
tions of the band.
The way to acccwnpllsh thie is to use a
phoneme speech synthesizer. One such
device is the Votfax (5CX3 Stephenson
Highway, Troy. Michigan 48084) SC4>1
speech-synthesizer IC, which la the basis
of a number of speech-synthesizer prod-
ucts (e.g., Votrax Type 'n' Talk). 01 course,
Ihefe Is a limitation— one must provide
phonetic data for the synthesizer, which
can be encoded manually or by computer.
There are a number of firms offering text-
to-speech programs for miGrocomputers.
These programs take ASCII-encoded En-
glish, and t^y folFowir^ a set ol rules, con-
vert it into the phonetic equlvaterrt.
According to the data sheet for the Vo-
trax SC-OT speech-synthesizer IC. only 70
bits per second of data are required foi^
continuous speech production. If you can
prepare whai you want to say In advance,
this provides a way to have "speech" over
extremely narrow band widths, ll would al-
so provide a way lor a visually Impaired
person to communicate with FtTTY.
As I menifoned before, a synthesizer
based around SC-Ol is programmed using
phonemes— The basic speech sounds of
English, TfwH© are 6* phonemes— this
means th^t only 6 bits need to be transmit-
ted for each sound (since any digttaf code
lis now legal, within band limitations,
there is nothing wrong with using S-htt
"words"). Votrax has symbols associated
with each phoneme to make transcription
easier. For example, "catalog" would t>e K
AE2 EH3 DT UH3 L AW2 AW2 G. and "emp-
ty'' would be EH3 EH3 M P T Y The pho-
name syrrttiola that end in a numtier (EH2,
EHS, etc) are foe vowel durations. Pfio^
nemes that end in a higher number axe lor
short^u ration vowel sounds.
WUh a bit of practice, one can encode
text into phonemes v^ quickly. A text-to-
speech programn such as the one avail-
able from MicroMInt {§17 Midway, Wood-
mere NV 1 1598) for the Apple II computer,
permits the user to simply type the text in
English and »et the computer worry atXMJt
the conversion.
Baoeivjng phonemeencoded data over
tfie air is a simple process. Just feed the
received data, through a buffer^ Into the
speech synthesizef. AIM he buffering and
controlling can be handled easily with a
short machine-language program.
Since this "mode" is not a true speech
mode. In that one must type one's trans^
mission rather than speak li. It la not
suited for CQOwsational eommunlcar
lions. An appfopriaie application would
tie for radio huiletins aryd similar one-way
communications, where the tranamitting
Station has prepared the message far In
advance.
A novel use Of this technique might tie
to have a "'sut)carrier" voice chann^ on
an FM repealer. By FSKIrvg ttie repeater's
output, a lew stations can receive the da-
ta using the discriminator output on tfieir
fU receivers. Any station using the re-
peater for conventional voice communica-
tions would not be abte to rvotice the small
frequency Shift on the repeater. Such a
subcarrier channel could be used to trans-
mit repeater-stetus Information, club bul-
letins, weather reports, etc.
Other Spe«ch^yTi|h«sis Technjques
There are a number of apeech-synthe^
sis techniqws available f*f^oneme syn-
tttesis. th« technique just described,
requires a very iow data rale (70 bps)v
Speech quality, however. Is not that good.
It Is understandable but requires a bit of
gettmg used to. (An analogy is the "mon-
key chatter" of SSB. It sounds strange to
people who have never heard SSB before,)
If one wants better speech quality,
ttvere iktm I wo choices: linear predichve
coding and speech digitizatioa Unear
predictive coding fLPC) is what Texas ifi-
slrurr«nis u««a in its "Speak and Speir
talking toys, The technique involves ait-
aiyzirrg human speech with compi/ter and
breaking it down into sound components.
To reproduce these sound data, they are
fed into a circuit which, by simulating a
human vocal tract, reconstitutes the da-
ta into fairly natural sounding speech,
Unfortunatety, lo encode UPC data, time-
conswnlr>g algorithms are needed. Be-
cause of this, the calculations are usual iy
done on mainframe computers or large
minleompulers- The encoded data take
up more room than phoneme^encoded
speech, per second.
Speech digitization Is much ike using
the computer"s memory as a tape record-
er. Speech is artaiyzed with an anaiog-to^
digital converter— samples are laken at a
rate ol 12^000 per second. The data from
128 73 Magazine • Apiil, 1964
Itie A/0 cofivQTter are stored In memory.
To recreate the sound, tbedala are played
back into a digital-to-analoQ converter,
whlcti la ci^rinected to an amplifier Digiti*
jEAlion usee a lol of memofy — 64 kitobyies
can only hold e few secomfs of speech.
The quality, tH^wever, is eMtrefT>e4y nalurel
sounding.
As you can see, there is no ''best^' way.
Eacli rDethod has distinct advantages and
disadvantages. Alier working with pho-
neme synihesi^ers fof a number of yeara, I
tend to lavor tt>em. The speech sounds
much like one would expect a oomptjter to
taik-'With a heavy monotone 'robot" ac-
cent—but consioerlng the memory effi-
ciency that a pliorieme aynthesfier offera*
it la or>e of the t>est methods arouFMJ. It's
aJao th« ofi^y method that Can provide an
unhmited vocabytary w4tho<it ext^isive
preparatiDn,
nMMiefne-eynihesUed speech can be a
useful and piaciicai part of a digilat com-
munications system. In addition to us^ng
kl as a narrowband speech technique. iH$
usefut in providing voice output on a RTTY
maitbox^ Stat ions without RTTY (or mo-
bHe atationa) can tvear what messages are
In memory. I will update sf}eech^yn thesis
lechr^ogy aa more hardware becomess
availableL
REVIEW
NOVICE GUtOE FROM BASH
Bash has doiw rl aga^n! The ail^new
Noific^ Class Amsteur Radio Ofmfwtof
6iiMe la now avail at>ie. and it's a beauty.
No, donl expect ttie old ffnat £xMm
bocii^ and don't expect to get the exact an-
swers to evefy question on the htovice ex-
amination, because ttve Guit^ is not that
kind of a boolL Thia time, due pemaps to
lh& new FCC requirements (which are
omered by the Qwth). the format Is tutori-
ai, but not pedantic or dulL II la light, easy
to road, and /i/n! Virtually ew^erylhlng the
|Hrosp«ctlv6 Novice will need to know lo
pass the theory portion of the exam la Irv
eluded.
Let's take a look at some specific fea^
lures covered by the guide, as well aa the
mechanical speclfJ cat ions. The book 4t-
seJt haa a $oft cover with a glosay ftn^
Ish In light tHue ajid btack. measurea
CmS^xV*". and weighs only a lew
ounces. . .exactly the neat^ eaay-tocarry
Size that you will find convenient lo take
with you but not so smaft tfiat It wifi be hid*
den under the piles of Ihlngs on your dealt,
tahle, or bench. Of course, you can'1 Judoe
a book by its covm, siie, or weiffht . . . you
have to look Inside.
Divided into 26 convenient chapters or
sections with such titles as "In the Begin-
nino," "The Ruiea Jewels.'* 'Zip Zap; Atjout
Ughtning;' 'Shorties," "So What Do I Say
Now?", and the 9 Ike, the Guid& tells you
neither too much nor too little, but gives
you exactly what you need to know to
pass the eKarrt.
As many of you know, the FCC has now
followed a long-tlrne practice of the FAA
with respect to exam guestlona— that la,
the questions that wtil be asked on eximlH
fiatlOfIt are published. That's right. THE
quest iorrsf So, wfiai's the tnck, you ask?
Wdl, the trick it that they choose only one
questton out of i possible ten or tvvonty In
^ich of twenty categories covering (he
Subject matter you are supposed to know.
Thsfefor^t it doesn't do any good lO
fnenrtorize specific answers to particular
questions. . you have to know the t:taslc
material. Knowing thai, you witi be able lo
answer any quest loniS asked, and that's
tile way it slioyld be^ ff you read t^ie Quid*
and understand what it t^K^ties arMi are
able to answer the practice questions,
ttien you wil^ be at>le to take tt>e Novice ex-
amination with full confidence that you
wttt pass. You'll t» able lo answer any
question In any category.
The Quiif0 provides a catch-all chaf>ter
covering many miscellaneous quest lona
that don*t fall oonvenlently into any of the
twenty categories, Dick Bash doesn't
want you to be caught by any surprise
Questions.
A very helpful chapter is "So What Do I
Say Now?** tt covers the Novice version of
mike frigh^l-^a condition that often occurs
wtien you are making your first tiaif -dozen
or ao coatacta. Ufa say you cair CO and
syddenly, magicatfy^ receive an answer-
Maybe It's a more experienced Novice on
trie oltiec end, and he seems to tie sendirtg
50 last that even your call (much less hi$
call) is barely recognizable. Before you
know iU he has signed over to you. . ^^ft^
thej'e's a great dead spot on the band,
waiting for your answer. You shaite, you
sweat, your fingers cramp, and you are
scarcely able to send your call. I^ou think.
"Oh my flosh, he's waltfng for me to aay
something, and I don't know what to aayf ''
Enter Bash, stage left, to hetp you out of
the dilemma. He gives you sample ex-
changes, things that are &aid by both
SJdes in a typical CW exchan^. You could
almost copy the Informailcsn vertutim, or
you can vary It to suit your own special
case by rnerely changmg a word or two
here and thiere. it does get you ovec those
first few critical moments wt^en every-
thing goes blaniL
There's much, much rnore^ of course, to
the Gufds, but we don't want to spoil ft lor
you tiy teHIng you everything that Dick
Bash has up his sleeve. Join in the fun.
Give the Gf//de to e Bon or daughter, a
friend, or anyone who might be thinking of
taking a Novice exam, Here^s a thought:
Maybe you will be giving the Novice ejtam
yourself to some potential hams in the
ctub or neighborhood, and you're saddled
with teaching the course. If you need a syl-
labus aiid lexi to work from, you could use
the Bash txx]4c lor this purpose, too. In
fact, t'll bet that you will find things there
that even you have forgotten. Heck, it'll
cost you only a well-spent ¥Sj96 (covei
price} from Basft Edacstioftai Services,
PO Box 21 f 5, San Leandro CA 94577.
Reader Service number 476.
JlmCrvy W1XU
71?Slan
THE COMPLBTE OXER
Few enjoyments surpass the comtort-
ablQ pleasure of settling In for an
evening's reading of a good book In a
snug and cozy environment. For best
results, the book should be Interest-
ing—whfch could mean entertainingly
written or instructive, preferably both. It
Should be fact-filled, yet eKcltinig ervough
to move the reader quickly through the ac-
tion, never permitting txxedonx Most of
an, a good tiook should fascinate tfie
reader aiKl. wt>en possible, piece him or
her right In the middle of the action. The
reacjer thien becomes immersed and Is no
longer aware of being a reader; Instead,
he becomes a participant. . .Involved in
the Story. Time loses meaning, and the
Story is all. You will find Bob Locher
WSKNI's The Comptete DKer such a book.
Written by an experienced DX chaser,
yet clear and simple enough for the begin-
ner, the ixsok tantalizes and teaches at the
same time. It recognizes that we all start
as beginriers. but, more than that, it helps
us learrt to do things ihe rigl>t way, to
avoid ttie traps and pli falls waiting to turn
a n>eophyte into a lid, until the goat ts In
Sight— tt>e DX Honor f^ll. II you're not on
your way to Honor Roll after reading and
practicing Boh s brar>d Ol DXing magic,
then it>e fault will be yours, not hia.
The Complete OXer can t)e a reference
and a guide. . .a welcome companion to
be savored at leisure. Most assuredly, It
represents a solid-^ld ireaaure trove of
information amassed by a skilled operator
during a lifetime ot DX chasing. After
reading the brief foreward and acknowl-
edgements, you are plunged into Chapter
1 , "A Night on the Bands," a foray Into the
OX jungle of twenty meters on an evening
wfien ttie band is open. YouVe there wf>en
Bob stalks — arid Oags— a rare A71 statiOfi
on Qatar. t}eatlng out tf»e r^t ot the wortd
lor this bitH^ame trophy. Thin, almost be-
fore you can recover yoyr breath, you hap-
pen upon the trail of a T56 but don't man-
age to track htm to his J'air before he disai>-
paara. Bob has managed to decipher his
wily hai>its, howevef, and you know that
next tln>e, Somalia will be yours. Th^s
chapter creates the desire to krtow morei
to t>ecome a patient and skfi^lfui hunter, so
you can go out on your own and capture
your own OX prizes, You learn that Iraten-
Ing and patience and skill mean more than
raw power, setting the stage for Chapter 2,
"Basic Listening."
The first section of the t>3ok deals with
basic and intermediate skills ar>d equips
ment. What to use, wf»ere lo II nd It, how to
use it, . a primer of great and lasting
value. TTie second section of thte book
builds upon the fUst. adding refinements
of technique, special trlcka of tlie tradep
and hkow to be a sportsman in the trveet
sense ol the word, tt teachiU you aOout
"Winning, Losing, and Ploying the
Game.'^ Finalfy^ Bo4? teaches you his
"last Secret" belore turning you ioosa on
the unsuspecting world In "Conclusion,"
you are leh with a philosophy arid a new
beginning.
Just the other day when I was talking
with Bob about his book, he asked me how
t liked it. I gave this anawer: ''I wish I had
written ^t"— the ultimate accolade. . .and
the truth. The Complete DXer is bound to
be a smash hit., so you had better get out
the checkbook right away and put (n your
ofder tKfore they^re gone. The price is
$10:95 plus SZQQ postage and handling.
VISA and Mastercard are accepted, tt's
available from tdtom Press, 8qx 593^ Deer-
ttetd it 60QJ5, Reader service nijmt)er 477.
Jim Gray W1XU
73 Stall
■202
>
1^
QUALITY SATELLITE TELEVISION RECEPTION
Designed And Engineered Especiaily For The Home
System A.
Conifer's DE-2001 features a t2' antenna, contemporary styled receiver, motorized Ani. drive, LNA,
plus all the hardware needed for a coinplete Installation, tjacked by a full-year warranty. The installa-
tion manual gives yoii over TOO pages of information and Instructions. All tills for only $2395.
Frt. CO.D.
System B.
10' mesh antenna, KLW OJyniplad receiver, 100" LNA. pdarotor I, arid 12S' of wins.
Only $1495
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-*- separately.
1
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19208 R. D. Mixe
Independence, Mo. 64057
816-795-1413
See List ot Adveftfsers on page 130
73 Magazine • April, 1984 129
To receive full informatiori from our advert is-
ers ptaasa complete ttis postage-paid card.
R.S.Na
P«9« as. Nil
P*gl R.SyNo.
PAfitt R. S. NOL
176
196
127
216
*
211
kce CkNTumiriTcat Jons, Inc. .....
Acquis Cofnm., tna ...,,.
Advance<l Computer Controli
..148
AEA/Advanced E^ecUofiic
ApplEcalJons ,....,.. 19, 53
Alden Electronics , .27
Alpha Oefta CQmmunic^ticfia, inc
Amateur Accessories. ....... .115
Amateur Communications^ Etc.
w
i . ) .'■'. i'.'. . *'■ . b ^ . . . . b J 1. H b
Amateur Electronic Supply
. 41 . .tlQ
...b...:,. b. .25.55.115
5
Amateur-Wholesale Electronic*
....75
243 Amateur-WhHOlesale Electronics
...,33
334
Amidon Associates . .
...,m
109 Analog Tech:rhalogy ......
...134
71
Applied Invention
....100
-■
AHRL Nationa] Contention
,= 95
•
Asttori Corp. ..... .
B1
228 Austin Dust orrtAmennas. .
.....4B
«
Autflif Researcli .^.-,i.
.....go
266 AzjmuthComrTiLCorp. . , .
45
«
BHCInc
.,,.135
202 B & L Ei\g\neef\ng ........
....129
11
BaH^ef & Will Eamson Joe. .
90
177 Barf^ef&WilliamsofiJnc...
.....41
305
Barry Eleciror^ka
47
476
Bash Ecf ucational Servicea
....129
152
Beflcher.lnc, ...,.*,,-»,»
. 40
BillAshby&Son..
....109
BfacksburQ Group. .
, *4.82
BHtt 5 2 Way. •...•*-...,
.-...e7
Break Camm, Systems, Inc.
,.,.109
Broadway Electronics ....
.,..135
Butternut Electronics
.66,113
462 CES, Inc
95
12
CZLaba
45
111 CeooCommunicalioosJnc ..,.60
69 Qutterf ree Modular Consoles
13 Coin InEematJooal ........... 134
14 Qommunications Cortcepts, Inc.
181 Com mun teat ions Conceiit^, Inc.
AfannBiK. ■■'■■<■■»■■■»■■ ■«■■■ lii I tf^^^
166 Communications Spec ha I lata, Inc.
.-l.T...b.. ■....., :. a. J.J .?
15 Communfcatjons Spectalista, ^nc,
* k hl4h I ■■ ri ■■ kfr-li-pl ha m i ^ ^ ^ 4 g f W
Compui&r Trader ♦ , ♦ , , 135
* ConnectSystems, Inc. ....... .37
37 Cofitempora ry Tec h noloQy , I nc .
45
25 Contrcf Products, Untimtted ... .46
141 Cushcraft Corp. ......*...... .89
DGM Electronics 44
345 Data Service 13S
Dayton Hamwent ion .......... .36
1S6 Diamond Worldwide..,...,,... 19
4^ Doppler Systems ... 107
480 Elect ronic Comporwnts Group
18 Bectronic Specialists, Inc. ..,,.60
1 35 Encomm, Inc. ...,,, .77
29 Esoteric Ervgineefing .,,,,.,,. 13S
99 Faxscan 46
23 F^eshef Corporation..* ii 109
482 Flestief Corporation ...... 117
as FoKTango Cofpof atioii ,,.,,,. ,40
143 GLB Electronics 97
352 Gfove Enterprises. . . .^^. ..,v*, . .90
31 Hal^Tronix .^ ^ . * f'^i-m-*'-*:'*-^-* ...... .Sv
101 Ham MaaterTapes ... . . .79
Ham RadioOutlet .3
33 Hamtronlcs.NY ,.158.169
479 Hamtronics.NY 116
303 Heath Company . , , , B3
184 Henry Radio 23
1^
477
36
93
122
156
82
9
48
45
54
4$
51
Horizon Printing Go. 115
Hu^tief Jnc. . .»»*... 4
IVOm . ..J. ...T. .«.,*.*■. OOW. (1,1/
Idiom Pt&ss ....... 129
IntefTiational Crystal Mlg^ Co. ... 146
JALBadloComm iCfi
John J. Me^oa, Jr.. \^vc. ...,.,.. 1 57
Jun's Electronics ...,...,. 82
/rMagazine 96
KLM Electronics 81, 147
Kantrpnics .......... .8,9^50, 151
l\^n WOOQ .1 1 I '.;.».... b . i
.CovJV,7
MCMCcmmuhicatiOns .,
...60,105
MFJ Enterprises ........
Aft AO
MHz Electronics ........
,.136-145
Madison Electronics
.......86
Magnum Distributors, Inc.
101
Microcomputer Business
Applications
..,•.,116
Micro Control Speciaities
.......IB
Microlog Corporatioa ....
51
MifageCommunicalio^is .
153
Missouri BadioCenter . 155
130
318
412
137
212
170
148
61
^4
62
484
133
500
Moler Antenna, Inc. ,...*...
Nampa Sat el I lie Systems . . .
Natiortal Cornm. Group Co
Nemal Eiectronira .
Nuts & Voits ♦ t * - 4 - - -
Orbft Magazine
PC Electronics ,,.*..*....
Parsec Commun' cat tone , . .
PipoCommL. _.........,,.
Processor Concepts
PuCrfIc Domain, Inc ....
Radio Amateur Cattbook, Inc.
Radionjt
Radio Werenouse ,,..,.*
Ramsey Etectfonic*
Regency Electronics, Inc. .
Rivendel I Associates ....
RUN Magazine . , .
73
m 1 1^4
28.29
111
134
124
114
115
.46
113
.36
149
113
..*,.107
.156.161
lie
■ F I ■ ■ H vO
.67
BOOKS, etc.
AMATEUR RADIO/ELECTRONICS TITLES
MICROCOMPUTER TITLES
Catslog f
K«m
Met
Cal«k»9i
BK73C7
Behind the Dial
S 4.96
BK7384
CT7305
5 WPM Code Tape
4.95
BK73e6
CT7306
6+ WPM Code Tape
4J95
BK7390
CT7313
13+ WPM Code Tape
4.95
BK7398
CT7320
20 + WPM Co6b Tape
AM
BK7386
Ct7325
25+ WPM Code Tape
4X
flK7404
CT7^^4
Code Tapes (any tour above)
1636
BK7400
BK7308
Contest Coo*5boo*t
5J95
CX;74001 T
BK7321
A Guide to Ham Radio
4.95
CC740012
BK7322
Hcjtitoy Cotnputers Are Hece
Z49
CC740013
BK7393
Uving on a Shoestring
7.97
BK738e
BK7312
The Magic of Ham Radio
4.95
BK7311
BK7340
The New Hobby Cksmputsfs
2.49
BK7334
BK73a3
The New Weather Satellite
B.95
BK7:^S
Handbook
BK73a2
BK7aiO
Owner Repair of Radio Equipment
7.95
BK7302
Propagatlofi Wizard's Handbook
6.95
BK7351
SSB. . .The Misunderstood Mode
5.50
BK736a
VHF Antenna Handbook
5.95
Catalog #
BX1000
SG7357
Study Guide-Novice Class
4.95
SG7358
Study Guide-Gensfal Cfass
6,95
BX1001
CT7300
Novice Study Tapes (Set of 3)
15.05
BX1002
LB73aO
Test Equip. Ub. V2— Audio Tester
1.95
LB7361
Test Equip. Lib. V3— Radio Equip.
1S5
L673ea
Test Equip. Ub. V4— IC Test Equip.
1.95
LB7365
Test Equip. Lib. VO— Vols. 2, 3, & 4
4.95
BK7315
World Repeater Atlas
2.00
Annotated BASIC Vot. 1
Annotated BASIC Vol. 2
Inside Your Computer
introduction to TRS* Data Files
Kilobaud Klassroom
Mach. Lang. Suiiroutines for CoCo
Pfog. for Electronic Circuit Design
BK7400 with Apple disk
BK7400 with IBM PC disk
BK7400 with TR&BO disk
The Selectric^ Interface
Some of the Best ham Kllotkaud
TRS-BO as a Controlief
TRS^/ZBO Assembly Lang. Ubrary
UncJef standing & Prog.
Microcomputers
SHELF BOXES
(tem
Shelf box— 1
Shelf boxes— 2-7
Shell boxes— a and up
Pegs
'PA'^^'UlU r>iT-a-i«-«-l^it^-..k ■■■■■> m VvV
SutTSCriptions ............ .35, 134
197 Sintec Company .S4
154 Slep Electronics -....,.,,_, ,1^
68 Spectrum Communicati<3ns 91
436 Spectrum I niemaiionaUr^. ...,114
Spfder Antenna ,140
473 Stephens Engineering Associates,
Inc .117
206 Surplus Sales of NE ........... 1 1 1
192 T^n" Radio Sales, Inc .97
63 The Antenna Specialists Co 13
& The Computer Journal . , 134
* The Ham Shaoft ,.......,160
305 Ttie MethenyCorp .4
104 Trionyx Industries ....,, 90
136 Tucson Amateur Packei Radio
,, ...105
203 Unicorn Bectrpriics ,,*...... 33, 39
l9e Unrffif^al AmaTetir Radio ...... .111
481 ynivGfS^ Electronics ^ 118
179 Universal El«ctrontea , .iS
tInivefBiity Microti Ems .......... 135
149 ymqueComniCorp. ...136
UrHty Eleclronics . . ... 135
* Van Gofden ErbQifwering , . . , 90
311 Vanguard Lab$ .*,-.,.,-,. 134
90 VqCom Products Gofp..., -»*,.. 107
W9fN hi Antennas -- .122
79 Wacom Products 46
483 Wafil Clipper Coqj, ........... 117
Weatcom 115
Westech Electronics. Inc. ..... 113
SO Western Radio Efecironic$ 45
tdO Western Radio Electronics . . . . 13S
' Wheeler Appl:ie<J Research Lab
Williams Radio SaEes , 46
107 Woodall & Associates ..,..,.. 134
B3 Yaeau Electronics .Cov. Ill
338 ZAssocLaies 134
Prf«
10.95
10.95
12.97
24J7
14,95
29.97
14J95
24,97
24.97
24^7
12J7
10.%
12.97
10.95
To Order
Pi1c«
2.00
1.50 ea.
1.25 ea.
SHiPPINQ AND HAN-
DUNG: $1,50 for the first
book. $100 for each addl^
tior^al book for US delrvery
and foreign surface.
S10.0O per book for for-
eign airmail. Orders pay-
able in US dollars on ly«
Complete the postage
paid card, or itemize your
order with payment or
cofnplete credit card irv
fgrmation Occlude post-
age and handling) to: WQ
Boc^s, ATTN. Retail
Sales, Rte. 101 and Bm
St., Peter1>0fOMgh, NH
03458.
130 raMagaztne • Aprit, 1984
BmER'N'BUY
73 CLASSIFIED ADVERTISING
RATES
Jniji V Idua Knon-commerc ^a I)
CoFTimercJal ...,,__,_,.
15( per word
50« per word
Prepayment by check of money order is required with your e{S. No discounts or
Gommiasiona are available. Please make your payment to 73. Bates for mulUple
insert lens are avaiiaDle on request.
ADVERTISING COPY
Advertising must pei'tain to amateur radio products or services. No special
layouts or positions are possible. All advertising copy must t>e submitted type-
written (double-spaced;^ and must include full name and address. Copy limited to
100 words, ma)(imum- Count only words in text. Address, free.
73 cannot verify advertising claims and cannot be tield responsible for claims
made by the advertiser. Uability will be limited to making any necessary correc-
tion in the next avai fable issue. 73 reserves the righlio reject any copy deemed
unsuitable.
DEADLINES
Copy must be received in Peterborough by the 5th of the second month pre-
ceding the cover date. If copy is recei^ved after the deadline, 11 will be scheduled
to run the foliowing month, unless specifically prohibited by the advertiser.
MATERIALS
Send to Advertising Department, 73, Elm Street, Peterborough NH 0345S.
WYOMING-UTAH RAf^CH LAND. 10
acres, S60 down, seo/month, FREE infor-
mation, maps, photographs. Trade equity
for ham gear, home computer, test equip-
ment-, etc. Owner— Mike Gauthier K6ICS,
&550B— Gallatin Rd., Downey CA 90240.
BNB001
MOBILE IGNITION SHtELDJNG. Free
literature. Estes Engineering, 930 Marine
Drive, Port Angeles WA 9fl3^2. BNB006
COMPUTED OWNERS! Super new IVIFJ
1224 CW/HTTY/ASCII terminal units-
Send/receive CW/HTTy/VlC-20 and Com-
modore 64 software. Full-featured, disk or
cassette. Kantronics, too. Low prices,
speedy delivery. Hundreds sold Interna-
t tonally. SASE for details and catalog of
Commodore, Atari, PET, ZX-81, Tl, TRS-BO
software and accessories. Amateur Ac-
cessories, 6 Harvest Court , RD 7, Dept.
BB, FTemington NJ 08B32. Telephone
(201>7&2-I55r, 6:30-10:30 Eastern time.
BNe0l9
COLOR COMPUTER owners— call (212>
441-2807 for FREE color computer hard-
ware and software catalog or write to
Spectrum Projects. 93-15 86 Drive, Wood-
haven NY 11421. BNB023
AZDEN SERVICE MANUALS, PCS 3000
and PCS 3O0— $5,00 eacti; PCS 4000—
5^9,00. N,P,S , 1136 Boxwood^ Jenlcintovtfn
PA 19046. BNB029
PSST* HEY, wanna make professional-
quality printed cfrcuit boards? One or
more Jn only SO minutes. Simple, inexpen^
sive, new system. Free 1984 catalog. PIN-
COR, 530 Palace, Aurora JL 60506; (312)-
696-0015. BNB036
MIHTAAY TECHNICAL MANUALS for old
and obsolete e£|uipment. 60-page catalog,
$3,00. Military Technical Manual Servicei
2266 Senas ac Ave.^ Long Beach CA 90815.
BNS045
DX HIDDEN ASSET LOOP ANTENNA. Get
on the air, comply witti no-visible-antenna
rules, from most tndoor locations. Inex-
pensive, easy-to-buHd antenna couples di-
rectly tofiO-Qtim coax; no antenna match-
er required. Omni direct ton a I with vertical,
bi-directjona! with horizontal polarization.
Vswr typically 1.2:1 at re&onanca; useful
bandwidth 3 to 5 percent of resonant fre-
quency, Plans and instructions, $12.50
postpaid, H, Stewart Designs ^ PO Box 643,
Oregon City Oft9704S, 8NB047
DftESS UP YOUR CLU8! Jackets, tee-
shirts, hats, sportshirts^ etc., wtfith your lo-
go or we'ii Custom design. Wav^Jength
Productions, 20-22 120th St.i College
Point NY 11356. BNB048
DEALERS IN SURPLUS TEST I^JSTRU-
MENTS, microwave equipment, and com-
ponents. Wanted: Late test equipment
(HP.t Tek, G.R,, Narda, etc,}, waveguide/
coax components- Immediate needs: HP,
K3&2A. R38aA, S382G. 432A, e52aA, 41 5E,
G.R. B74- and 900-serles coax ^tems^ G.R.
1633, 1863, 1B64. Request want list. Lec-
tronics, 1423 Ferry Ave., Camden NJ
06104; (609)-541-4200. BNB050
WANTED— your unused Teletype^^ re-
pair parts. High prices paidl Send SASE
for list of Teletypewriter parts and sup-
plies. TYPETRONICS, Box 8873, Fort Lau-
derdale PL 33310; {306>5a3 1340 after 9:00
pm. N4TT. BN&052
COLLINS: 325-3, 755-3B, 30L-1, more.
Also HyGain TH65DXX, rotator, tower.
Make offer, WA7WOC, (602)^67-2376,
evenings. BNB054
TS-§30S with YKBeC/YG455C filters and
SP230 speaker, 1600.00. Heat hk it SB200,
$30000- Heath kit SB-634 station monitor
console, $50.00. Heath kit SB-614 monitor
scope, $75.00. Yaesu FT'7j $275,00, Robot
400 with Sanyo video monttor and earners,
$600.0C, Radio ShacK TRS-60 Model I with
Macrotronfcs M800 RTTy program and
Flasher TU170, $400,00, Denjron Super
Tuner, $50,00. James F, Kraus^ 1100 West-
over Ln., Schaumljurg IL 60193; (312)-
894^398. BNB056
WANTCO: Old keys for my telegraph and
radiotelegraph key coJiectton. Need
pre- 1950 bugs. All models of Vlbroplex,
MartJn, Boulter^ Abernathy^ McElroy. etc.
Also need Spark keys, Boston keys, iarge
or unusuaF radiotelegraph keys, side-
swipers, cooties, homebrew, and foreign
keys. Meal McEwen K5RW, 112B Midway,
Richardson TX 75081. eNB063
BECOME ALARMINGLY SUCCESSFUL Ra-
dio amateurs quickly grasp the relatively
simple hookups of burglar alarm systems.
We can help you get started tn this ex-
citing, rewarding business. Our Buyer's
Guide lists oyer 300 manufacturers and
wholesale suppliers and we have loads of
information on how to get started in this
rapidly growing field. Information, S2.00
(redeemable). Plenty of employment-
business opportunities. Security Elec^
tronics International, ROB 1456, Grand
Rapids Ml 49501. BNB064
WE ENJOY creating ham pEaques, tro-
phies, awards. Pse QSO. Prices, shtp-
ping— low. Care— free. J & J Trophy,
Grove Street, Peterborough NH 03453;
(603) 924-7804. BNBOBS
WANTED: Pr9-1950 TV sets and otd TV
GUiDE magazines. W3CRH, Box 20-S, Ma
comb IL 61455; (309)-833^1S09. B1MB066
RETIFtING? Consider a business of your
own. Security alarm systems are easily
learned. InstailatJon in businesses and
residences js easy, enjoyable, fascinat-
ing, profitable work. Information that
could change, improve your future; $2.00
(redeemable). Security Electronics Inter-
nationa I, PO Box 1456-\/, Grand Rapids Mr
49S01. aNB067
WANTED: Military surplus radios. We
need Collins 6181, ARC-72, AflC-94, ARC-
102, RT-712/ARC 106, AflOl14, ARC-US,
ARC-116, RT^23/ARC'131 or FM622, RT-
857/ARC'134 or WJIcox B07A, ARC-159,
RT1167 or RT1168/ARC-ie4. RT-1299/
ARC-186, RT-esa/APX-ZS, APX-76, AflN^a,
ARN-S4, ARNm RTne04^APN-l7lf RT^329/
APN-171, MRC-95, 71BF-1/2, HF-105, Col-
lins antenna couplers, 490T^1, 4MT-2,
490T-9 , CU^ 1 658 A/ A RC, CU ■ 1 m2iQ RC,
490B-1. CU-12a9/ARC-l05, 4900-1, Top
dollar paid or trade for new amateur gear.
Write or phone Bill Slep, (704h524'75l9,
Step EEectronics Company, Highway 441,
Otto IMG 23763. BN8071
19&4 WIRE & CABLE prices cutJif Call or
wrEte for latest listings. Certified Com-
munications^ "The CB to 10 Meter
People,'' 4138 So. Ferris, Fremont Ml
49412: (616^924-4561. eNB073
KQ6P NOVICE EXAM KIT^M pCC no
longer supplies written test! The Novice
Exam Kit provides everything you need to
give the Novice exam including. . .Smulti-
pfe-choice written exams, . . 6 code tests
on cassette (3 tests using 5-wpm cliarac-
ters and 3 tests using IS-wpm charac-
ters),,, all FCC forms (610 and PR1035A)
. . . plus "Instructions and Helps for the Ex-
aminer." Only $5.95 (plus 11.00 slilpping)
from Spirit PubJications, 2200 Er Camino
Real Suite 107, Redwood City CA 94063.
Discount to clubs! BNB076
SAN ANTONIO, TEXAS, OTH FOR SALE.
4-2-2 with 70foot tower, etc, WeClVl, (512)-
684^129- &NB077
TI99rta flTTY. Mini -memory required.
Mark and space tones are internally gen-
erated In send mode. TU Is needed for re-
ceive-only, $17.95. Mark Schmidt, 4^61
Lark Dr., BeaJe AFB CA 95903. BNB078
'♦FOOLPROOF LOQG^NG" program de-
scribed in November, l&SS. 73 magazine
available for TRS-BO Model III. IBM PC,
and CP/M-80 computers using Microsoft
BASIC. $35.00 for diskette, manual, ppd.
'Super-Jog" written In dBASE^H source
code for almc^t any computer, $5000.
Specify disk format. Write for datatls. GRF
Computer Services, 6170 Downey Avenue,
Long Beach CA 90605. BNBQTS
COLLINS MONITOR 1012 for three 455^
kHz Inputs, $25; TS-1&6D frequency meter,
100-1 000 MHz with case, $25; TS 909 null
bridge, 10k decapot, manual, cables, her-
metic aluminum case, $25; Dolinko-Dolins
vacuum capacitors, 6-50 mmF, $18; Taffet
Q^neter, $50; Heath Q meter, $40; SB8B
Panoramic analyzer, no P.S., $25; band-
pass filters, Krohnhite 31 DAB, $60; Day-
tronics 720, $50; HP FM detector. 10-
500 MHz, $20; shipping extra. Lisatus, 116
Orton, Caidwell NJ 07006; (201^226-7943.
SNB080
ABC denotes Arson, Burglary equals
Crime. Security alarm industry really
booming. Tremendous demands. Employ-
ment-business opportunities terrific. Get
in now. ]nformati;on package, $2.00 (re-
deemabie). Security EEectronics Interna-
tionai. PC Box 1456-FR, Grand Rapids Ml
49501. BNB081
iCOH IC-730 xcvr w/mfcrophone, FL-^O
and FL^5 fitters, HM-10 scanning micro-
phone. Eiccellent condition. Complete
w/manuais and original packaging. S539.
Glen KA7IWL, (Q01)-375-4074. BNe082
WANT TO GET ON RTTY CHEAP? Klein-
schmidt page printer, reperf, and TQD.
Practical ly new with manuai, adjusted
and ready to go, $100. Cal Stiles W1JFP,
PO Box 664, Hanover NH 03755. BNB0e3
OlGtTAL DISPLAYS for FT-1013, Ta-5203,
Collins, Drake, Swan, and others. Write for
information. Grand Systems, PO Box
3377. Blaine WA 98230: (604)-530-4551.
BNB064
KV4/KP2 STATION, ST. THOMAS- Con-
test s/DX/ vacations. Singiesi^clubs. Paul
Mufi-ay WA2UZA, RD 4, Princeton NJ
08540; (201)-329-6309. BNB0S5
ATTENTION C-S4 USERS: Don't buy a log-
ging program until you've read our fact
sheet. For free information, write to Crum-
tronics, PO Box 6187, Ft Wayne IN 468%.
BNBOee
STOPI! SUPER SAVfNGSf Kenwood
R-200a, $499.50; R-1000, S409.50;
FRG-7700, S429,50; Sony 2002. £225.50;
Panasonic RF-B300, RF-S600, call 1 1
Uniden CR-2021, $209.50; Regency HX-
1000, HX-3000, MX-5000, MX-700D, in
stock— cal II! Bearcat BC-100, $288 .50;
BC-250, S249.50: BC-300. $359.60. Fre-
quency directories, cordless phones,
rotors, coax, antennas, much moreE! Free
UPS siitpping and insurance to 4S states.
25-page picture catalog. Si. 00 {refund-
able). Galaxy Electronics, Box-1202— , 67
EPer Ave., Akron OH 44309; (216)-376'2402.
9:00-5:00 pm EST. BNB0a7
ROHN TOWERS— Wholesale direct to
users. 23% to 34% discount from dealer
price. All products avallabie. Write or call
for price list Also, we are wholesale dis-
tributors for Antenna Specialists, Regen-
cy, Hy-Gain. Hill Radio, 2503 G£ Road. PO
Box 1405, Bloomington IL 61701-0687;
(309)"663-2141. BNB088
EMERGENCY COMMUNICATIONS— An
Organizational and Operational Hand-
book^ by K3PUR. A complete reference
guide for ARES/RACES and other public
service groups, as reviewed In December
'S3 QST and January 'S4 CO. $9.95 plus
$1.50 PyH to: FDW Arts, 1394 Old Qufncy
73 Magazine • April, 1984 131
Une. Roatofi VA 22090 (VA residents, am
4% tax}. BN60&d
BECeiVlftS-Motorola WWV, S35; Hanv
m«rlund HO-100A, ¥85; i^alional NG^IQO,
195; rl signal Qsnerator, 30 kfi-€0 mc. $30;
R P. aij(]lo siDHfll Q»»ratOf, S30. K&KZT,
2S5e Al«jcftnaer, Los Osos CA 93402.
BMBuOu
FOR SAL£: Kenwood TS520. SSSOOO; T»
TKO. S260iK}. E3(cetleftt condftion. Cal
Swtnson weWYJ. PO Box 1395, GraM
Vall«y CA 96945, (9ie>Z754l67.BNaOd1
flJUIHz SSe CRYSTAL RLTEHS, 6-flOle.
2i4cH; bandwldm. 1,85 shape factor, 6- to
eo<IB. New^ with hardware, specirica-
ik^r St7,S0 postp^d. 4CX250B chinv
neys, Johnson i 1 24-0 111 -001 ^ r^fiw, box^:
$5.00 postpaid, two for S9.00. Dentron
Scout CAP tranficelver, new: $300 post-
paid. Mosley CM-1 recelvef, 80-10, VGC:
S60,00 postpaid. Hammarlund SP0OO
JX-17, GC: $140.00. VW. E Delage, PO Sox
231 , Kent OH 44240. BNB092
FOR SALE: New CLBJicraft R3 half wave
vertical, $215. Tom WA1RTD,21 Bayberry,
Aclon MA 01720; {617>263r238Z BNB093
OX HEADING MAPS for Boston, NYC,
PhiUdfllplila. Banirnore, Detroit, Atlanta,
Chicdgo, Hmt Ofteans. St. Louis. Dallas,
LA. 11'x^17', $1J5 pp. 22*k34\ fS.96
pp. Specify dty. Massey. PC Box 397.
Halnfisport NJ 08030; (609}-26V2d&2.
eN6094
COMMO[>ORE fi4 CW lNSTRL>CTOfl PRO
GftAM. Q6f^9rat&& CW on TV speaker.
Random cotit^ keyboard Input, or prcnr^
GOfdwd "CW tests." Ctiaracter spe«d *n*l
^paein^ $«t IrKlep&rMtentfrv. OMtgned for
classes Ami IncreaBliH} (Ode 9peed-
(1&.00— di&k^tte or cassette (sp«cNty)-
Denn^s Olver N7BCU, 20909 S. Ferguson
Rd.. Oregon CJty OR 97045. 8NB09i5
STATE-OF'THE-AHT, rugged, tow-prollle
antenna sysl&nns Helical designs from
3.5 to 50 MHi DDRRs Irom 144 to 450
MH^. Refer to 73 magazine revi>ews in Oc-
tober and November, 1982. Co^n-Rad In-
dus tries, 25 Imson Street. Buffalo NY
14210; (7l6)-773-1445. BN8096
ANTI-STATIC DUST COVERS by Cover
Craft Corporation, Amateyr radio, conv
putera, printers, dish drives, VCRs. New or
olclar models. Over 1,000 designs in stock
and over T, 000,000 in use. Call or write (or
brochure. Birch Hill Sales, PO Box 234, P#.
teftxjrough NH 03458; (603)^924 7959.
BNeOST
FREE FREE GIFT, interested in amateur
radio, cofnputers. video? Large SASE pse
and menttofl 73 magazine. Free gift to etL
Narwld Electronics. €1 Beltot Road, Ring-
wood NJ 074a@. dN809e
FIND Otrr wt\at e^se yoy can hear on your
Qmm^<&*BTag& transcetvef or rec«lv^.
Complete infortnation on major North
American radios rstenlr^ clubs. Send 2Sc
and SASE Association of North Armnctm
Radio Clubs, 1500 Bunbtjry Oflve, Whittier
CA 90601. eNBC99
THE 8IG UST: a custorrvpfoduced com-
puter printout on bor>d papet, wiin letter-
equality pftnu showing preflxoa, locations,
beem heading, and distance to almost 600
OX, US, and Canadian locations. All pro^
duced for your location! No more guess-
ing where a country or US city Is located!
Listing is alphabetical according to DX
prefix and also by cliy Please provide
your exact latitude and longllude with
order, or we can use data based on the
closest airport, ttils printout is over 11
feat In length! $15.95 ($17.35 with deluxe
binder). The 8lg List, 10126 Catalina Drive.
Indianapolis IN 4623«, BNB100
MAGICOU ftp SPEECH PROCESSORS—
Add 6 dB of ai^erage output with genuine rf
clipping in your trar^smittef's l-f stages
Custom engineered lor Kenwood TS-IBO.
TS-t3Q, TS-430, T&^520, TS-530. T^^2Q^,
Drake T4X TR-7; Yaesu FT-102- Excel leftt
speech quaUtVi simple Installation, af-
for^Ms prices! SASE for data and cost.
Maaicom; PO B<» 6552A, B«3ievue WA
96007. BNB101
SULTRONICS otters TET anjenna sys-
tems With facto<ry tj^diup and parts- C«ll
Of write fof our compJete catalog with full
descriptions and $i>m& on the full tirve ot
TET antermas^the best! Fof fast aiKJ
friefid^ service as usual, oortiact Dan
WOaiOZor Nina N8ANU at Suftron^cs Anrv
ateur Radio, 15 Sexton Drlvit Xertia OH
45385^ (;513)^7&2700. BNB102
SULTRONICS has Hy-Gain at the lowest
prices anywhere!! TH70X— $369,96;
TH5MK2S— J303.95; new ExploreM4—
only $264,951! Limited to stock on handi
30 call or write nowM Sultronlcs Amateur
Radio, 15 Bex ton Drive, Xenia OH 45385;
(513)^76-2700, BNB103
WANTED: older tube-type amateur or gen-
eral^overage receiver In Qood condition.
Send description and asking price. Steven
0. Jones N2AMY. Bom 6685, Ithaca NY
14851. BNB1D4
MARK
DAVY CROCKETT
On April 2S, 1984, the Bryan Arr^ateur
Radio Club will run a spectal-event station
In the Crockett National Forest to cofii'
memorale tfw contTlbutlons of Davy Croc^^
ett to the fight for Texas Indapendence.
The club will operate W5RAS from 1800
UrC Saturday to OBOO UTG Sunday on
SO-2 meterfi on the phone bands. Certifi-
cate for $^1 and an SASE to QSL nianager
KASOnr, 2203 rranklln, Bryan VC 77B01,
TATER DAY
The Ma^ahall County ARA will be oper-
ating a special-event station from 1000Z
April 1 to 2400Z April 2 to commefrvorata
the I4lsl Tat«f E)ay Ceiebratiork. Opefa-
Iton will be on CW. 7120, Operation 20 km
up from Icnwer 40-lSme4er General pfvone^
bund ed>ges a rut 146.55 simplex. Certlli-
cate will be given. Ser^ QSL aAd la/oa
SASE to WG4U, Route 2, Benton ICY 42025
XWARN
X-WARN (Xenia Weather Amateur
Radio Met) ar\r40unces the planned oper-
ation of special -event radio station
WeeOZZ on Marcfi 31 and April 1. 19&4.
Our operation commemorates the rebuild*
Ing of Ihe Xenia community on the lOth
anniversary of the killer tornado of Aprli 3,
1974. Th I & triple twister damaged half of
the homes and businesses in a city of
25.000 and killed 33 persons. Amateur ra-
dio contributed immensety with emergen*
cy communications In the hours and day a
after the stomi. X-WARN was organized
subsequent to the tornado as a means of
providing prompt local weather observa-
tions during National Weather Service
atarts^
TT^e spectat event will Operate two HF
transceivers from 1500 to 6300 tJTC on
Salufday and 1500 to 2300 UTC on Sun-
day, Frequencies wtJI bte SSB 7.275,
1 4^75, BnH 21^75 ( ± 10 kHz), We will also
have a third rig on S-meter FM' 146,52 Sim^
p4e]e or the X-WAHN repeater 147.165/765.
PlflS8« send QSL and SASE to N8QYS ip^r
Csttfbook] for special commemoraiive QSL
ARBOR DAY
A special-events station will be operat-
ing from the Neb^'asita Stale Artior Lodge»
former rmme ol J. Slsftlng Morton Ifound*
er of Arbor Day), m Netiraska City, Nebras-
ka, during the annual Arbor Day celebfai-
XkOKU Ttiis station^ in addition to ottier
club-member stations, will be operating In
the Genera! portion of the phone and CW
bartds on 60 through 10 meters from 2400
UTC April 27 lo 0600 UTC April 29. In addi^
iJofK oth& ciutHt>ember stauons wilt be
operating from their own OTHs Irom 2400
hours UTC April 23 10 08O0 nou/s UTC
April 29. All amateurs oofitactir>o tfiis sta-
tiori^ KiTIK. or any other cluiHtiambef sta-
tions durir^g these times will be iill||0lle to
receive an ArtxM Day comm«moraiivs cer-
tlffcaie ftom the N^s^aska City Amateur
Radio Clubu f^ease send one dollar and a
business-size self-address^ envelope to
John K. Nlhart KAliOKl. 7731 Holdredge.
Uncoln NE 66505.
H/IM HELP
1 have recently purchased a Radio Shack
TR&BO rrwdef 100 and would like to kncm if
tfi<ere is any ttam software available for it
commeffctally. I am particularly Intartalwl
in any CW sefKi^rec^ive and FTTTY software
»nd would appreciate having Itw names of
«ny companies ttiat might hai« such
Systems,
CALL LONG DISTANCE ON 2 METERS
Only TO watts drive will de*rver 75 watts
of RF power on 2M SSB. FM, ot CW. It is
biased Cla^ AB for linear operation. The
current drain Is 8-9 amps at
13.6 Vdc, It comes in a well
constmcted, rngged case
with an overs i zed heat sink
to keep it cool It has a sen-
sitive C.O.R. circuitry,
reliable SO-239 RF connec-
tors, and an amplifiar
IN/OUT switch. The max-
imym power input is 15
Our products are backed by prompt fac-
tory service and technical assistance. To
become familiar with our other fine pro-
ducts in the amateur radio
martcet^ call or wrrle for our
free product and small parts
catalog.
Mode* 875
Kit $109.95
Wired & Tested $129.95
watts.
IQDmnnunication
I Concepts Ina
CCI
Information about software for other
compiit^^ that run Basic would even be
h^^ful, as I think that I cou^ld adapt it for ihe
rttadellOO.
DavkS C. Eanee MAZI
46ee Dnjsilla Lm
iMon flouoi LA 70000
I want someone to ha«t a sked witfi rrie
to increase my CW spaed Mi^t use key^
boanf and start al ^ wpm For mora info^
call 004>9e3-2t57.
Varrftirfc IQCSY
RL 2, &QK 388X
own WV 28505
I would like to hear fr%im anyone who has
modifications to put the Ten-Tec Omnt on
lO-rrketer FM.
Stephen J. O^Mallay N2CLE
140-26 Poplar Ave,
Rushing NV 11 3SS
I need a service manuat or achematic or
copy of same foe a Yaesu FM FT-202R
handle-talkie Also need crystals for 2
meters or charger.
Cyril T. Wo«f WATiOV
S. 5507 Marstutl Road
Spokane WA 98204
132 73 Magazine * April, 1984
•S* •!• O^^*^ 'S^^S'^&^^S* ^*&^4••*•4♦*J' *S**2* »y *J*^4**C* C*^* •***J* ^»i* ^*^ •^^^h^tjt ^ttjit'i **4f^ 1^4^
MM HELP
I want a program for a Commodore 64
where I can put in iriy latitude and longitude
and the other station's latitude/tongitude
and get the other station's distance In
miles.
I have tried converting programs fof this
written for the Radio Shack models 1 and 3,
Heath, and He wfell- Packard 9845 and can-
not get any to run. Also, one written for the
VlC-20 didn1 work either.
Gaiy i^ayne KE6CZ
1347 E Dakota
Fresno CA 03704
i need the schematic and op&rating man-
ual for the Knight TR-106 6-nieter trans-
oeiver wUh the model V-107 remote vfa Any
hdp wiJI b^ appreciated.
P. J. Mlhuln KAanZL
70 Clay St.
Manlstae Ml 49660
I have a HalElcrafters SR-150 transceiver
and need a replacement rf switching relay,
Halilcrafters part numt>er 021-000651. It's a
3-pole, double-throw miniature manufac-
tured by Jayco. A used but operable relay
woufcT be fine. Would also t^e interested In
an SR-150 that someone is willing to "part
out."
Larry Kaja WA9RW0
4001 H. Holstef
Tucson AZ 65749
I would appr^late hearing from anyt)Ody
who operates 10 through 20 meters from a
travel trailer, I need to know the type of an-
tenna being used and tK>w It Is mounted.
James L. L^herty KA6CMD
laOS Bahia
San Mateo CA 94403
I need a schematic and operation man-
ual fof DuMont 274 scope. I will gladly pay
copying costs and postage.
Rolwrl A. Johnson N7CFX
633 E. Gwinn Pt
SeattteWA96ia2
I would like to hear f nsm anyone who has
converted any Motorola UHF Motracs
064 LKT or LI54LHT units to the 440 ama-
teur band. Areas of most concern are the
osctiiator and the front-end cavities.
RUfrion L Kasekamp KK3L
PO Boat 222
Eltefslls MD 21529
I am looking for a sefvice manual for a
Pace BI-SIOO UHF FM 6H:?hannel business-
band rig artd a Lafayette Micro PI 00 UHF
tunabie receiver. J will pay for copying and
mailing charges.
S. May
PO Box 2S5
SImcoe, Ontario N3Y 4L1
Canada
mE LUTES
Apr
May
Aroateui
Sate
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Reference t
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SLEP SPECIALS
TEN TEC
525DAHQOSY(1DIGrrAL10t¥10W,3SB/CWa.&^MHZ
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2!60 DELUXE POWER SUPPLY 115/220 VAC 13.5 VOC 18 AWP WUH SPEAKER
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WE ACCEPT MJC. VISA, OR CHECK. ADD UPS SHIPPING. SAVE MONEY BY ORDERING TODAY AT
THESE LOW DISCOUNT PRICES. MA^LOR PHONE a ILL SLEP 704-5247519.
Slop Fleet ranics compamf
P.O. BOX 100, HWY. 441
OTTO, NORTH CAROLINA 28763
— ^' T %"* 1
p^154
♦
t
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•I*
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73 Magazine • April, 1984 133
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" COMPUTER
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UNIQUE CGMMUNiCATIONS, INC.
la^ E Longvrew. P Q. Bon 5234
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t^See Li&t of Advertisers on page }3Q
73 Magazine • April, 1984 135
PK.
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EimC «aO,000D^7I um SIOOO and 30306
9000 Ofid SKB06 only.
(Tliese are all new not used J LMlEd &£Dly.
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GENEVA CALCULATOR WATCH
This attractive vatch has the following modes:
Konaal Time Setting,
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Featured in Black Plastic
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or Featured in Stainless Steel
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SILICON DIODES
FEED THRU SOLDER RF CAPACTORS
MR751
lOOvdc
6 Amp 3
10/$5.0Q
100/$38,00
470pf +-20%
MR510
lOOOvdc
3Ainps
iO/S3,75
100/524.00
HEP 170
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2 Amps
20/$2.00
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ISAmps
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10/ $15.00
1000/$ 100. 00
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2 5 Amps
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IK213BA
600vdc
60Atnps
$5.00
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lOOOpf/.OOluf
+-10^
DSaS-04C
400vdc
SOAmps
$10,00
10/ $80.00
IN3269
eOOvdc
160AiQp3
$15.00
10/SJ20.00
4/Sl.OO or 100/$20,00 or
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300vdc
250Anips
$20.00
10/$175<OO
1000/S150.00
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SKTRZOK
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IN 4 US
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2708 1024x1
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$2.00 each
FAIRCHILD
AlH
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$4.00 each
25 For $25.00
or 100 For
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27L32/25L32
$10.00 each
BEaLETT PACKAHS HlCROWAVE OIODES
tH57n
IS 57 12
m6263
5082-2835
5082-28Q3
C50S2-2800)
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Quad Hatched
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11
II
II
ii
II
n
II
n
II
II
II
If
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to
10
iO
10
ID
for
for
for
for
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SIO.OO
S 5.00
SIO.OO
for $40.00
For Information call: (602) 242-3037
Toll Free Number
800-528-01 80
(For orders only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
(fM*9|z eleetroi|ie§
'All parts may be new or
surplus, and parts may bt
&ubsiituied mlh comparable parts
if we a/e out of stocii of an itefn."
i
136 73 Magazine • April. 1984
"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 300HHZ
6.5dB Max. 1 to SOMHz
8.5dB Max. .2 to 300MHz
same as above
8.5dB Max. 50 to 300MHz
.3dB T^p.
$21.00
WITH DATA SHEET
NEC (NIPPON ELECTRIC CO. LTD.
NF Min F=2GH2 d8 2.4 Typ.
dB 3.4 Typ.
dB 4.3 Typ.
NE57835/2SC2150 Microwave Transistor
F=3GHz
F=4GHz
MAG F=2GHz
F=3GHz
F=4GHz
dB 12 Typ.
dB 9 Typ.
dB 6.5 Typ.
$5.30
Ft Gain Bandwidth Product at Vce=8v, Ic=10ma. GHz 4 Min. 6 Typ.
Vcbo 25v Vceo Uv Vebo 3v Ic SOma. Pt. 250niw
UNELCO RF Power and Linear Anplifier Capacitors
These are the famous capacitors used by all the RF Power and Linear Ain^lifier
maniifacCurerSj and described in the ¥F Data Book.
5pf
lOpf
18pf
5.1pf
12pf
22pf
6.8pf
13pf
25pf
7pf
lApf
27pf
8.2pf
15pf
27.5pf
30pf
32pf
33pf
34pf
AOpf
43pf
51pf
60pf
80pf
82pf
lOOpf
llOpf
120pf
130pf
lAOpf
200pf 1 to
220pf 11 to
470pf 51 up
500pf
lOObpf
lOpcs
5 Opes
pes
$1.00 ea
$ .90 ea
$ .80 ea
NIPPON ELECTRIC COMPANY TUNNEL DIODES
Peak Pt. Current ma.
Valley Pt. Current ma.
Peak Pt. Voltage mv.
Projected Peak Pt. Voltage mv.
Series Res. Ohms
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Valley Pt. Voltage mv.
IP
Iv
Vp
Vpp Vf
rS
Ct
VV
MODEL 1S2199
9min. lOTyp. Umax.
1.2Typ. l.Bmax.
95Typ, 120max.
= Ip 480niin, 550Typ. 630max
2 . 5Ty p . 4max .
1.7Typ. 2max.
370Typ.
1S220O * '^
9min. lOTyp. Umax.
1.2Typ, l.Smax.
75Typ. 90max.
440niin. 520Typ. 600max.
2Typ. 3niax.
5Typ. 8max.
350Typ.
FftlRCHILD / DUMONT Oscilloscope Probes Model 4290B
Input Impedance 10 meg., Input Capacity 6.5 to 12pf . , Division Ratio (Volts/Oiv Factor)
10:1, Cable Length 4Ft. , Frequency Range Over lOOMHz.
These Probes will work on all Tektronix, Hewlett Packard, and other Oscilloscopes.
PRICE $45.00
- — ■ ■
MOTOROLA RF DATA BOOK
Listsall Motorola RF Transistors / RF Power Amplifiers, Varactor Diodes and much much
more.
PRICE $7.50
For InlormatJon call: (602) 242-3037
Toll Free Number
800-528-01 80
(For orclert only)
Q^^^^T, electraqics
"All parts may be new or
surpluSr a.nd paft& may bt
^tstif uted with comparable parts
if we are out ot stock ol an item."
PRICES SUBJECT TO CHANGE WflHOUT NOTICE
I
73 Magazine * April, 1984 137
^
RF TRANSISTORS, MICROWAVE DIODES
■m^
ISKS
Toll Free Number
e00-52S-0180
(For orders only)
TYPE
pfuo:
TSfPE
micE
Tf^
PRICE
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$25.00
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2.30
QFXS^
2.50
MfW20e3-1.5
42.50
FWlfifiE
vm
2!35090
13*80
SFXa5
2.50
MRt-^OS
16.10
PT4176D
FUH
2WG108
3.45
BFxee
2.50
MKfZ12
16.10
I^41B6B
POft
2N5109
1-7C
HF'XSS
1.00
mF22^
13,25
trm209
POR
2N516Q
3.45
BTOl
2.50
HRR324
15.50
P'lva20gC/5645
PCH
2N5177
21.rtV
HFi'ie
2.50
mFA3i
10.92
PTH=w;
24.60
2N5179
1.04
BBY19
2,50
IIRF232
12.07
PT15/U
7.50
2jti^lB
56,00
HFi'^g
2.50
mFA'Al
12.fi5
PM577
POR
2l5aS3
3.45
iitvyo
1.00
IDIF237
3.15
Fr4590
PC3R
2re589
9.77
61^57
15.24
mg?23B
13 m
P14612
KJH
2Ki5P0
10,92
H^BaC3
15,24
mfzm
17.25
FPt«X«
PGH
13.80
0^9303
22,21
MBF345
35,65
Pr4G40
POR
SM)637
J5.50
HLVSTA
8.94
ieF247
3r>.6D
FT4&42
POR
2HS641
1^.42
IViVftRCS
13.06
IS&304
43.45
l»r^632
4.70
ae642
14.03
B094C
21. Tl
IRt30e
33.81
1^749
PCft
215643
la.so
BO^l
10.00
10^^14
28.52
FTBRS?
RJK
216645
13.80
BE^56aC/CF
30.00
I^F315
28.flfi
mw/m
RK
2N5d4a
?0.70
015B-617
25.00
lfIF316
KB
nS730
POR
2|fi651
u.os
C4005
20,00
IKF317
a^.94
PTRfilO
RJH
2(@e9i
1ft no
ansa9
20.00
imt'420
?f>.nf>
PIB534
PCR
22^764
27.00
CIi21fl8
18.00
IIRF421
36.80
PrS609
FGR
2*E5a36
3.45
aiP545
25.00
mf'\2^
41.40
P^r8633
POR
2N5842/»lia07
3.45
L"il3005
100.00
MRF427
17.25
prft6.T9
PCR
35849
20.00
Dexcel GaAa li;!"
MIlF42a
46.00
P18659
POR
2K5913
3,^
DXT*150LA-Pl00l'
49.30
MRF433
ia.07
HH679
put
2N591£
36,00
PiijitELi GaAa WT
MRF-149/A
12.65
pra7oe
PPR
:>DI5922
ID. 00
ISX52WF
58,00
Mltl'^150/A
14.37
ym70&
POR
Klfifl23
25,00
Qinp,90A
2.50
MRF453/A
18.40
PTB727
29.00
2H5941
23.00
lihJ^/fi
4.95
1WF454/A
20.12
F1X731
vm
2NS042
40.0n
HEPS3002
11.40
MRF4d5/A
16,00
PIB742
WAQ
:^N»S144
10.35
mPS30O3
30,00
IIBR58
20,70
Pr8787
HJH
2>^945
11 50
HB3S3005
10.00
IIRF463
25.00
Pr97B3
16,50
2tm4e
14.40
^P^0Q6
19.90
MSF472
1.00
m^im
32.70
2N6O0Q
10,35
aSiS30O7
25.00
jept75
3.10
PI9790
56, m
2NB0S1
12.07
HS'SSOIO
n.34
mewm
2.00
PT319S2
KH
SNSoee
12.65
Hewlett E^dERTd
IHF477
14.95
poidss
vm
2ivn3
13.25
Hti:i22C4
L12.Q0
ieF492
23.00
pmnR3
POR
?mnm
15.00
35i£dlK
38.00
WffSQQ
1.04
PnCBBAO
pm
mmm
11.00
368266
32.00
lffiF503
6.00
ECA
^6005
12,00
35iVii¥.
32.00
IHF504
7.00
40t»l
5,00
a»R«w
16,10
35831E'H31
30.00
1«F508
5,00
4(^/1^
10.00
2N6C07
20.70
35831E
30.00
MFSll
10.^
40fiitt0
4.62
2N&1Q6
21.00
X^A^F
50.00
l«EF515
2.00
40^^
10.00
2N6136
21.35
35SSTF:
50.00
\m^i7
2.00
40282
a^.oo
2Nei06
40.24
35S53E
71.30
lilFb59
2.05
4(^30
2.80
2N6201
50.00
35S54t,
75,00
mF&^
20.00
40292
13,05
2NB^04
1.50
35S6t>E
44.00
mtmu
25.00
40294
2.50
2Ne^5g
18.00
HKTR3101
7.00
Mhi<!B23
g.65
40341
21.00
2N6567
10,06
iiX'IH310a
a. 75
MnJB29
3.45
4Q60S
2.48
2N6680
ao.oo
lffi:TE5101
30,00
klliFB44
27.60
40894
1.00
liiL7U3
3.00
IDi'ilflalM
6a, 00
SiffiFS46
29,90
40977
10.00
2a:?56A
7.50
Hjcmeios
31,00
fc!IU>il6
15.00
62aOQA
60,00
s^'Tm
2.80
KJCIWBIOB
33.00
lffiFB23
20.00
R07M
25.00
2SC101fi
1.00
J310
.70
imFSOl O) Lead
i,nn
6E37a9
25.00
29nC>t2
12.00
•mm
mP^l (4) Lead
2.00
Hmo
25.00
RsnnTo
2.50
JCSOUO
10.00
IIIF^04
2-TO
S50-12
25.00
2SCIZ3&
2.50
«IO@(Xki
25.00
Wf911
3.00
S;«I06
5.00
23C12S1
12.00
JtiMMS
25.00
IIRF9t51
2.30
K«I31
5.00
29CtJUb
2.90
licjtorola Ca^n.
ltff8004
2,10
S:!A3S^
5.00
S&Cl.JO^
5.50
ini^i
8,50
IB26ir
PUR
dC^l3S23
5.0Q
25n424
2.80
mi:^.
11.95
asaTso-is
725,00
pfticE CN fajijiaagr - pqr
''All parts may b€ new Or
surplus, mid parts may be
substituted with ccmparatile parts
Lf we at'e out o1 stock of an Mm"
For Information call: (602) 242-3037
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
JVI^l|z electrolytes
1 38 73 Magazine * A pr 1 1 , 1 9S4
GaAs, TUNNEL DIODES, ETC.
TYPE
pprc^
'nCUSQN CSF
SU345
$ 5.00
SM45
5.a>
mnnm
15.00
anood
15.00
s>ija»-3
15.00
aJioi2
e,90
SD1012-3
9; 30
a>1012-9
&,m
SD1013-3
13.50
331013^7
13.50
SDiai4
LI. 00
SDlOH-fi
11.00
SU1016
15.00
SD1O10«5
15. DO
SSIOIBhmI
15.00
aJ101&-6
15,00
SD1018-7
13.00
a>ioiB-La
15.00
SIIQ20-S
10.00
aniQBB
15.00
SJ1030-2
12.00
S0XO43
12.00
SDlfK3-l
10,00
SP10I5
3,7S
aJlOS0-l
2,00
S310G3
4.00
ano65
4.7S
SD1068
15.00
SD1074*2
IS. 00
aDl074-4
28.00
aU074^
28,00
911036
20«00
a>MK7-l
4,00
anor7T-6
4.00
SO107B-6
24,00
SOlOBO-8
6,00
SDt06D-9
3,00
SDLW4
&.0O
5011167
l&*O0
93Ke9^
15.00
soioes
15.00
a)uoo
5.00
^llD©
IB. 00
S>in5-2
a. 00
3DU1^3
a, 00
S5111S-7
a, 50
smxm
5.00
amis
22,00
* B F "mA:^. .
_. flS -
I^
PRICE
IVPE
SBflllff
S 5,00
ail278-5
mu24
50.00
S>12Sl-2
a>ii2T
3.50
SI1283
SKiiaa
14,00
301289^1
saiaa-i
14*00
SD129D-^
S51154-1
3.00
3D1290-7
SD1135
S,00
ajiaoo
soiiae
13,00
a>1301-7
SD1136-2
15.00
SI1305
^1143- J
12.00
WlMfT
mttl43-3
17,00
3n3X
S)l 144^1
3.00
snail
^1144»
15.00
Sm317
auu^T
IS.QQ
331335
a^iise
10.00
SDi>l5-6
s}ii«ie
21.00
301365-1
SD1200
1.50
a>136&-5
2)1201-2
10.00
511375
amoc
DO, 00
§01375^
S>1212-11
4.00
331379
SD1212-12
4.00
5Di:ift0^1
.^1212*1©
4,00
SDi;«iCt-3
SU1214-7
S.OO
331380-7
SU214-U
5.00
SD1405
S>1210
12,00
a>i«e
^l2ld-4
15.00
muio
S?121&-5
15.00
ffln4l0^3
SJ^W-B
15.00
SDM13-1
S]t220
e.oo
a^Hie
SPEIS^O-?
8,00
331422-2
331222^
16,00
an42d
Sni222-H
7,50
an423-2
a>l3S4-lO
18.00
3>1429^3
S11225
16.00
an42d-5
SD122B-8
PO?
331430
SD^29-7
13.00
331430^2
S0l2S9-ie
13.00
331434-5
3D123I
4.00
331434-9
^124&-8
15.00
3^1438
3^244-1
14*00
SD1441
SH262
12.00
Sn442
an263
15.00
^1444
331263-1
15.00
SD1444^
aDl272
13,00
SD1450-1
an2?2-2
15.00
SD1451
331272-4
15.00
SD1451^
an27B
20.00
3314S2
311278^1
IB. 00
SD1452-2
TYPE
FRIGE
MICE
918.00
B.OO
10.00
15.00
15.00
15.00
3.00
3.00
3.00
3.00
3.00
1.00
10.00
3.00
5,00
2.50
2.50
7.50
7. SO
15.00
1.00
l.OO
1.00
40,00
la.qo
22.00
21.00
18,00
50,00
S4.Q0
33.00
15.00
15.00
15.00
12.00
16,00
30.00
30.00
%.oo
91,00
15,00
e,oo
e.oo
2B,00
Ifi.OO
16,00
30,00
30.00
le Gau Gross fleferencs Host RF Transi;atQr^, DIck^s, Hybrid Modules And Any Other Type Of Semioonductor.
* UlQtlES nUT CAHftI KR, HICROHfAVE ,PIN , SQUnin' . lUNNEL, VAFWCTOft, GUNN ) *
331453-1
S4^,Q0
aDl454-l
48.00
ail477
48.00
a>147B
21,00
mx4m
60. 00
mum
1.50
331484-5
1,50
SD14ftl-6
1,50
SDl4a4"7
1.50
spi4aa
3e.do
801488^1
^.00
an48B^7
27.00
S>148S-^
28,00
a;l400-l
39,00
331520-2
13. GO
331522-^
33,00
331528-1
34,00
33lSaS-3
34,00
S>153&-2
3S.0O
S3I53&-1
41,00
33X545
34,00
331561
7&.00
SF4557 MSL,
25.00
SSOOm RCA
5.00
aOlTT HCA
15,00
3ISr7l4 Hot.
2.50
^lF75d lt>t.
3e.oo
SRF1018 mu
s.oo
SHr2147 lot.
22,00
mF2356 iHot,
38.00
SRF2378 Mot.
16.00
SBTTSm Hoc.
40,00
srsmimA,
25.00
SRraSST UK.
20,00
ttiBam tcA
15,00
TISWe/MBFBSe
3.35
TP312
2.50
TP1014 IWI
5.00
1F1028 Ittl
15.00
oi-arranuM/
■tZS-mS Mnt.GKTTB
. 65.00
TXVJ2201 M.P.
450.00
62803 »CA
100,00
TA7205/2S5921
80.00
TA74e7/2*©92)0
73.00
TA7995/2NS3S7
150,00
Sf30S2 mi.
IS. 00
iepti9
8.05
sjm
3 3.40
mziD
4.00
L'CIK
5,80
1M^
3.40
1K23CB
4.00
imsw
10.00
1W76
26.00
1K78B
26,00
iin4e
e,€o
1IM15G
15,00
1}«31
10,00
1IG930
15.00
LN3713
IS, 00
Uf3717
14,00
1N3747
21.00
1N4812B
d.oo
liei42A/B
4.25
Iiei4fi4/B
4. 25
11^53
3.75
1^713
5.00
1^200
15.00
A2XXiai Aertech
50.00
BL181 Qamc
5.00
Di23:m Alptm
nm
I&047C AlplK
VOR
£££6158-98 Alpte
vm
GC3 691-89 CiiZ
31.35
QC2542-^6 (312
37.40
HP9Q62-D112
14.20
HP5082'43375
POR
iff5fle2-102&
pce
W>50fi2-Z303
5,^
lffQO^-2800
1.00
llP50e2-3039
6.70
HPB082-3379
1,50
tl>S082-8013
PCft
IU475
FCit
ttA4t7e6
ton
IIM363&
POR
Mumoo
3.05
MA47SD2
IIGIB
S 3.40
iKiim
$ 3.40
L^IC
S 3.40
UQIIK
4,00
1N21QI
6.00
miiMF
5.00
USllQ
5,80
1J^2
5.00
WS3fk
10.00
USSC
3,40
imxR
3,40
V&3D
4,95
lN231ffi
5,00
11425
7,50
IJQfiAR
18.00
li©9
10,00
IH32
20.00
iNsrjA
55,50
IN76R
26.00
IH78
25.00
iX?BA
30.00
INTSO
28,00
urmm
28.00
jxim
38.00
imsofi
18,00
1M15
4.00
u*4iac
4.00
WtXSi
5,00
IMlfiE
e.oo
lli446
10.00
1NB33
10.00
ll»50
4,00
1N1064
2.00
uesss
15.00
m3^40
15.00
1N3712
11.00
110714
11. OO
IN3715
16.00
1N3716
10.00
1II3718
10.00
IN3721
14.00
1N3733
10.00
1N438S
20.00
IN4396
15.00
1N47S5
11.00
lim39A/B
4.^
11B14QA/B
4.25
1IB141A/B
4.25
l]^l43A/6
4.25
1J&144A/B
4.25
1%145A/B
4.S
L*5147A/B
4.^
L^ol48A/B
4.25
imim
5.50
1IB465
7.65
UB711
1.00
1N5711 JAN
2.00
lie7ti7
2,00
UCSBS
1.00
1E2199
15,00
1S2206/9
1.00
aB1087/4aRa6B553
S5.00
803020
66,00
WJICSB
1.00
BBi06G
l.OO
a>4/4JFBH G.E.
15,00
affi514AB C.U,
PCR
P1060 Mrtm
Ptit
D1159 Alpha
PQR
DiaOO Alpha
PGR
M30S Alpha
FOR
ll«d87U Alpha
PCB
D6J47D Alpat
PCK
D&503 Alftm
FOR
IBS08 Alpha
POR
»f36022 Alpha
TOL
IlDB4eQlA AUiha
POR
19^0064 Crem
POR
0Cl50fl-a9 QU
31,35
0C1607^0 (IE
31.33
oca53i^8s as
37,40
OC3208-40 CHZ
37.40
0C170'1-1 GHZ
50,00
I{P3:)&14A-|P1
135,00
Hl%082'^0241
75.60
HP50eS-0253
105.00
IffS082-0320
58.00
WSOa2^386
POR
^5082-0401
poa
»>50e2-O138
POR
»>eoe2-i332
FC£
E|i50e2-2254
PCM
n>90^'Z3Qa
10,70
Iff5£362-26S€
FOR
S^5062-2711
23.15
llPS0e2-2727
POR
»>5O62-2805
4.45
HP5062-2835
l.OO
S>5062-23S4
PCtL
WS082-3040
3e.oo
HF6082^3080
2.00
HP5082-31S8
l.OO
HP50a2-6459
POR
HP50B2-&462
POR
HP5DB2-6a8a
pen
lff^082-8323
POR
K3A Kkmtpon
7.00
MA450A
POR
KM0006
POR
MA^i 141^7
fOR
IIA41?^
f(»
l£^13004
48.00
MM3S6S
POR
liM3G22
PGR
ttf45im
27.00
1IA47CH4
nn
IIA47Q31
25. SO
I1IM7202
30.80
MM 7771
POR
HA47B3&*
POR
IM9108
37.95
UA43558
POR
liAa6731
125.00
• an smoi aiANt^ miu- so call if if the p/wt yod need is not lisieo .•»•«•.•♦♦*.••••.••••••••••••••»»«••***•"••••**•
For Inlonnation calf: (602) 242-3037
Toll Free Number
800-528-0180
(For orders only)
"All pans may b« new or
surplus, anCi parls may he
substilul^ wHh comparable parts
If we are out of stock of art Item,**
Q^^i\x electroi)ic$
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine • April, 1984 13fl
COAXIAL BELAY SVXICHES SPm*
Electronic Specially Co ^ /Raven Electronics
Fart i 23K28 Part # SU-Ol
26Vdc Type N Connector, DC to I GHst.
FSN 598S-5S6-96a3
$49. 00
Asp hen ol
Fart # 3 Ifr-I 0102-9
115¥ac Type 6NC DC to 3 GHz.
$29.99
Fart f 300-11182
120Vac Type BNC DC to 4 GHz,
FSN 5985-543-1225
$39,99
FXR
?art f 300-11173
12QVair Type BNC Same
FSN 5995- 5i> 3- 1850
$39,99
mC To Banana Plug Coax Cable RG-5S 36 Inch pr BNC to H Coax Cable llG-58 36 Inch.
S7.99 or 2 For $13.99 or 10 For 150,00
$8*99 or 2 For $15,99 or 10 For $60.00
SOLID STATE RELAYS
P&B Model ECTiDB7Z
PRICE EACH $5*00
Diglsig, Inc, Model ECS-215
PRICE EACH S7.50
Grig«by/ Barton Model GB740D
PRICE EACH $7.50
3vdc turn en
5vdc ttim on
IZOvac concaci at 7araps or 20aiips on a
10^'x 10"x ,124 aluminum* Heatalnk with
all Icon grease .
24Dvac contact I4antpe or 40amps on a
10**K I0**x .124 aiutolnum. Heatsink with
silicon grease.
140vac contact at J 5ainps or 40amp3 on a
10"x 10"3C .124 aluminum. Beatslnk with
silicon grease.
NOTE: *** tte^s nsay be substituted vith other brands or equivalent model numbers, ***
Svdc turn on
(^Vf^
For tnlonnation call: (602) 242-3037
elect roqiGjki
"All parts may be new or
surplus, and parts may be
sul}«^titutecl wimcofTiparable parts
it we are out oi slock of an ilem "
Toll Fr«« Number
000-528*01 80
(For ardtr* only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
140 73 Magazine • April, 1964
RECALL PHCME MEHORY TELEPHONE tflTH 24 HOMBER AtTTQ. DIALER
The Recall Phone Telephone employs the latest state of art
cannnimicAtlons eechriology.lt Is a coixtbinatioit telephone
aod automatic dialer thet uses premlust-quallty ,flolLd>stjite
(lirciiitry to assure hlgh-rel lability performance in personal
or buainesfi applications* $49*99
AflOS ALPHA RAPID BQMDtKG GLUE
Super Glue fCE-4a6 high strength
rapid bonding adhesive. Alplia
Cyanoai:rylate*Set--Tli»e 20 to 40
sec. t0.7fl.o2. (20g;m<)
$2.00
TOUCH TONE PAO
This pad contains all the electronics to
produce standard touch^^tone tones i Nev
with data.
MHfl
>
$9.99 or 10/589.99
HTTSUHI UHF/VHF VARACTOR TUKER MODEL UVElA
Perfect for those unscraiobler projects.
New irith data*
S19.99 or 10/5149,99
IHTBGRATCD CIRCUIT-
MC1372P
MCI35BP
MCr350P
MC1330A1P
MC1310P
MC1496P
LM565N
LM380N14
LMi889N
NE564K
KE56iM
Color TV Video Hodulator Circuit-
IF Amp. ,Limicer,FM Detector, Audio Driver, Electronic Attenuator
IF Amplifier
Low Level Video Detector
FH Stereo Demodulator
Balanced Modulator /Demodulator
Phase Locked Loop
2l^att Audio Power Amplifier
TV Video Modulator
Phase Locked Loop
Phase Locked Loop
1 CO 10
tlup
4.42
S2-93
5.00
4.00
l.SO
1,25
1*50
1, 15
4.29
3.30
1.50
1.25
2.50
2.00
1.5&
1.25
5.00
4.00
10.00
8.00
10.00
8.00
FERRA.NTI ELECTROHICS AM RADIO RELi:lv£R fflJDEl ZN414 tSPTEGHATED CIRCUIT^
Features:
1*2 10 1^6 volt operating range., Less thim 0,5iBS current consuaptioti. l^OICHz t<» 3MHz
Frequency range* ,E9^ to Assesable ^no alignment necessary. Effective and variable AGC action.,
WHl drive an earphone direct. Excellent audio <}ualltyi. , Typical power gain of 72dB*|IO-ld
package. Vlth data. S2. 99 or 10 For S2A. 99
NT CAD RECHARGEABLE BATTERIES
AA Battery Pack of 6 These are Factory
New* $5,00
SUB C Pack of 10 2*5Amp/Hr* $10.00
Gates Rechargeable Battery Packs
12vdc at 2*5Aiiip/Hr.
12vdc at 5Amp/Hr,
$11.99
$15.99
z electroi|}Ci
"'AM pafis may b« new or
fturplus, and parts may be
suDsiituted w^lh comparable parts
It wa are out of slock o1 an Uem"
MOTOROLA MRF559 RF TRANSISTOR
hfe 30nin 90typ ZOQrax.
ft 300CtTtiz
gain Sdb min 9.5typ at SZOrtiz
13* typ at 512itiz
output power .5watts at 12.5vdc
at 87QTtiz.
$2,05 or 10/$a5.00
For informatton call: (602) 242 3037
Toll Free Number
800-528-0180
(Far ord«rt only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine * April, 1984 141
^M
"SOCKETS AND CHIMNEYS"
EIMAC TUBE SOCKETS AM) CHIMN^EYS
^t-R!— iPHHi
SKliO
SK300A
SK40G
SK406
SKAie
SK500
SK600
SK602
SK606
SK607
SKBIO
SK620
SK626
SK630
SK636B
SK640
5K700
SK7HA
SK740
SK770
SKeOOA
SK80&
SKBIQ
SK900
5K906
SKUZO
SKli90
Socket
Socket For 4CX5000A,R, J, 4CX10,OOOD, 4CX15,O00A,J
Socket For 4-l25A,250A,AOOA,400C,4PR125A,400A,A-500A,5-500A
Chimney For 4-250A,400A,400C,4PR40QA
Chliroey For 3-4D0Z
Socket For 4-1000A/4PR10QOA/B
Socket For 4CX2 50B.BC,FG,R.4CX350A,F,FJ
Sockec For 4GX250B,BC,FG,R,4CX35OA,F,FJ
Chimney For 4CX230B»BC,FG,R,4CX330A,F,FJ
Socket For 4CX600JjJA
Socket For 4CX60QJ , JA
Socket For 4CX600J^JA
Chimney For 4CX600J,JA
Socket For 4CX6aaJ,JA
Chimney For 4CX600J,JA
Socket For 4CX600J»JA
Chimney For 4CX600J , JA
Socket For 4CX300A,Y,4CX125C,F
Socket For 4CX30€A,T,4CKi25CtF
Socket For 4CX300A,T,4CX125C,F
Socket For 4CX300A,Y,4CX125C»F
Sockec For 4CX1000A,4CX1500B
Chimney For 4CXiOOOA,4CX1500B
Socket For 4CXia00A,4CXl500fl
Socket For 4X50OA
Chimney For 4XICM}A
Socket For 5CX3(H>OA
Socket For 4CV8000A
SPOR
$520.00
260.00
74.00
36,00
390.00
51.00
73.00
U*00
60,00
60.00
66.00
10,00
66.00
34,00
36.00
71*00
225,00
225-00
86.00
86.00
225.00
40.00
225.00
300*00
57.00
650*00
585vO0
JOHNSON TUBE SOCKETS AND CHIMNEYS
124-11I/SK606
122-0275-001
124-OU3-00
l24-n6/SK630A
114-U5-2/SK620A
Chlnmey For 4CK250B,8C,FC,R, 4CX350A,F,FJ
Socket For 3-500Z, 4-125A, 250A, 40OA, 4-500A
Capacitor Ring
Socket For 4CX250B,BC,FG,R, /4CX350A,F,FJ
Socket For 4CX250fl/BC,FGpR, /4CX350A,F,FJ
813 Tube Socket
5*500A
$ 10.00
(pair) 15-00
15,00
55.00
55,00
20.00
CHIP CAPACITORS
*8pf
Ipf
Klpf
1.4pf
hSpf
L8pf
2.2pf
2Jpf
3.3pf
3.6pf
3,9pf
4.7pf
6,6pf
e.spf
S.2pf
PRICES
I to 10 -
II to 50 '
51 to 100
lOpf
12pf
15pf
iSpf
20pf
22pf
24pf
27pf
33pf
39pf
47pf
51pf
56pf
68pf
Upf
,99t
90e
.8oe
lOOpf*
UOpf
I20pf
130pf
ISOpf
160pf
laopf
SOOpf
a2Dpf*
240pf
270pf
lOOpf
330pf
aeopf
390pf
101 to 1000
.60c *
1001 i UP
-35c
470pf
SlOpf
S&Opf
620pf
680pf
SgOpf
100Qpf/*001uf*
1800pf/*001Suf
2700pf/.O027uf
10,000pf/.01uf
12,000pf/.012uf
15,000pf/.0lSuf
ie,000pf/.018uf
IS A SPECIAL PRICE: 10 for $7.50
100 for S65,00
1000 for $350.00
TUBE CAPS tPlate)
$11,00
13.00
14.00
17.00
20. OC;
URl, 4
HR2.3, 6 fi. 7
HR5. 8
M9
HRIO
WATKI^jS JOHNSON WJ-V907 : Voltage Controlled Microwave Oscillator $110.00
Frequency range 3.6 to 4.2GiHz, Power oyput, Min. lOdBm typical* 8dBrn Guaranteed*
Spurious output suppressicm Hamwriic (nfo). ^i^- 20<iB typical, In-Band Non-Hamionic, min,
eOde typical. Residual FH, pk to pk. Max. SKHz, pushing factor, Majc, 8KHz/V, PyVlIng figure
(L5;l VSWR), Wa*. 60Klz, Tuning voltage range +1 to +15volts. Tuning current, Hax. -0.1mA.
modulatiofi sensitivity range. Hax. 120 to 30HHz/V, Input capacitance. Max. lOOpf, Oscillator
Bias +15 +-0.05 volts @ 55mA, Hax.
Toll Free Number
S00-S2&^)180
(For orders only)
^'All parts may be new or
surplys. and parts may be
sut^tEtuteo with comparable parts
it we are oul of stock oi an i^im,"
(^^^ff[z elect roi|ics
For information call: (602) 2423037
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
142 73 Magazine • April, 1984
TUBES
TYPE
PRICE
TYPE
PRICE
TYPE
PRICE
ZC39/7289
S 34 . 00
n82/4600A
5500,00
HL7B15AL
S 60.00
2E25
7.95
4600A
500.00
7843
107.00
2K28
200.00
4624
310.00
7854
130.00
3-500Z
102.00
4657
84.00
HL7855KAL
125.00
3-1000Z/8164
400.00
4662
100.00
7984
14.95
3B28/866A
9.50
4665
500.00
8072
84.00
3CX400L17/8961
255.00
4687
P.O.R.
8106
5.00
3CX1000A7/8Z83
526.00
5675
42.00
8117A
226.00
3CX3000F1/8239
567.00
5721
250.00
8121
110.00
3CW30OOOH7
1700.00
5768
125.00
8122
110.00
3X2500A3
473.00
5819
119.00
8134
470.00
3X3000F1
567 . 00
5836
232.50
8156
12.00
4-65A/8165
69.00
5837
232.50
8233
60.00
4-125A/4D21
79.00
5861
140.00
8236
35.00
4-250A/5022
98.00
5867A
185.00
8295/PL172
500. 00
4-400A/8438
98.00
5868/AX9902
270.00
8458
35.00
4-400B/7527
110.00
5876/A
42.00
8462
130. 00
4-400C/6775
110.00
5881/6L6
8.00
8505A
95.00
4'1000A/8166
444.00
5893
60.00
8533W
136.00
4CX250B/7203
54.00
5894 /A
54.00
8560/A
75.00
4CX250FG/B621
75.00
58943/8737
64.00
e560AS
100.00
4CX250K/8245
125.00
5946
395.00
8608
38.00
4CX250R/7580W
90.00
6083/AZ9909
95.00
8624
100.00
4CX300A/8167
170.00
6146/5146A
8.50
8637
70.00
4CX350A/8321
110.00
6145B/8298
10.50
8643
83.00
4CX350F/8322
115.00
6146W/7212
17.95
8647
168.00
4CX350FJ/8904
140.00
6155
110.00
8683
95.00
4CX600J/8809
835.00
6159
13.85
8877
465.00
4CX1000A/8168
242 . 50*
6159B
23.50
8908
13.00
4CX1000A/8168
485.00
6161
325.00
8950
13.00
4CX1500B/8e60
555.00
6280
42.50
8930
137.00
4CX5000A/8170
1100.00
6291
180.00
6L6 Metal
25.00
4CX1.0000D/8171
1255.00
6293
24.00
6L6GC
5.03
4CX15000A/8281
1500.00
6326
P.O.R.
6CA7/EL34
5.38
4CW800F
710.00
6360/A
5.75
15CL6
3.50
4D32
240.00
6399
540.00
6DJ8
2.50
4E27A/5-i25B
240.00
6550A
10.00
6DQ5
6.58
4PR60A
200.00
6883B/8032A/8552
10.00
6GF5
5.85
4PR6CB
345.00
6897
160.00
6GJ5A
6.20
4PR65A/8ia7
175.00
6907
79.00
6GK6
6.00
4PR1000A/S1S9
590.00
6922/6DJ8
5.00
6HB5
6.00
4X150A/7034
60 00
6939
22.00
6HF5
8.73
4X150D/7609
95.00
7094
250.00
6JG6A
6.28
4X2 5DB
45.00
7117
38.50
6JM6
6.00
4X2 50F
45.00
7203
P.O.R.
6JN6
6.O0
4X500A
412.00
7211
100.00
6JS6C
7.25
5CX1500A
650.00
7213
300.00*
6KN6
5.05
KT88
27.50
7214
300.00*
6KD6
8.25
416B
45.00
7271
135.00
6LF6
7.00
416C
62.50
7289/2C39
34.00
6LQ6 6.E.
7.00
572B/T160L
49.95
7325
P.O.R.
6Lq6/6HJ6 Sylvania
9.00
592/3-200A3
211.00
7350
13.50
6ME6
8.90
807
8.50
7377
85.00
12AT7
3.50
31 lA
15.00
7408
2.50
12AX7
3.00
812A
29.00
7609
95.00
12BY7
5.00
813
50.00
7735
36.00
12JB6A
6.50
NOTE * = USED TUBE
NOTE P.O.R. = PRICE ON REQUEST
"ALL PARTS MAY BE NEW, USED, OR SURPLUS. PARTS MAY BE SUBSTITUTED WITH COMPARABLE PARTS IF WE
ARE OUT OF STOCK OF AN ITEM.
NOTICE: ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE .
For ififorniation call: (602) 242 3037
Toll Free Number
800-528-0180
(For orders only)
'*AH parts may b« new Qf
surplus, and parts may be
substituted witti qgrnparable pa^s
if we are oirt of stocit of an item/'
(^^^|z elect roiycs
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine • April, 1984 143
"FILTERS"
COLLINS HechaniCQl Filter #526-972^1-010 MODEL Fit55Z32F
455KHZ at 3,2KH2 wide. May be other models bat equivalent, Kay be used or new, $15,99
ATLAS CrvstQl Filters
5.59S-2*7/8A^B, 5. 595-2. 7A^
8 pole 2.7KH2 wide Upper sideiard. Srpedence SOOohms 15pf In/800ohms Opf out. 19*99
5. 595-2, 7/8 AJ^ 5.595-2,7A>SB
e pole 2.7Khz wide Upper sidebard, Irrpedende SOOohms ISpf In/800ohms Opf out. 19.99
5. 595-, 500/4, 5. 595-. 500/4/0^
4 pole 500 cycles wide O^. Inpedance SOOohms 15pf IiVSOOohms Opf out, 19.99
9.0USB/CW
6 pole 2-7KHZ wide at 6dB- Inpedance 680ohTis 7pf In/BOOolins 8pf oat, CW- 1599Hz 19.99
KOKUSAI ELECTRIC CO, flechoniCQl Filter #HF-455-2L/ZU-21H
4S5KHZ at Colter Fteque:nGy of 453* 5KC, Carrier Frequency of 455KHz 2,36KC Bandwidth,
Utfer sideba«3- (ZU) 19,99
UyMQT sidebard. (2^) 19.99
*«•«»••«»•««««»*««•••«
«»**«»•*•*«««»»
*«•*«•«#««»•«»«*«•#«««»*##•#•••««««
CRYSTAL FILTERS
WTKKO
TEW
SDK
TYCO/CD
MOTOROIA
pn
FTI
PTl
FRC
FILTEOi
CERAMIC FILTERS
FX-07800C
FEC- 103-2
SCH'113A
TF-3IH250
001019880
4884363301
5350C
5426C
1479
A10300
ERXF-15700
7.8MH2
10,6935MH2
11,2735KHZ
GF 3179. 3KH2
10.7MHz 2pole 15KHz b^ldwidth
11.7MHz 2pole 15KHZ bandwidth
12MI1Z 2pole 15KHZ bandwidth
21,4MH2 2pole ISraz bandwidth
10.7MEiz ©pole bandwidth 7.SKHZ at 3dB, 5KH2 at 6dB
45Mi2 2pole 15KHZ bareiwiath
20, 6MHz 36KHZ wide
CF 7-825MBZ
510,00
10 . 00
10,00
19 , 99
5,00
5.00
5.00
5.00
20.00
6-00
10,00
10.00
«*«•##«*« «»««*ii«#«»««#«#4-#«*«»**«ftft#«^*«-i «#••###
**-»*«««*•»«•**»
AXEL
ci£vrrE
^UPPOf
TOKIKf
MATSUSHIRA
4F449
TCHOIA
1CF4-12D36A
EFD455B
BFB455L
Cra455E
CTM455D
CFR455E
Cru455B
CFU455C
CFU455G
CFU455H
CFU455I
CFW455D
CEW455H
SFB455D
SFD455D
SFElO.Tm
SFElO.TMS
SPGlO.Tm
ir-B4/CFU455I
If'-B6/CFU455II
IF-B8
IP-CIB
CF455;V^FU4S5K
EPC-L4 55K
12,6KC Banipass Filter 3dB bandwidth l,6KHz frcm 11.8^13.4KHz
455KHz^-2KHz bandvddth 4-7% at 3dB
455KHZ-I-1KHZ bandwidth 6dB min 12KHz, 60dB max 36KHz
455raz
455KH2
455KHZ H-5,5KHz at 3dB , -i-SKHz at 6dB , 4-16K]iz at 50dB
455KHZ 'f-?KHz at 3dB , 4-lOKtlz at 6dB , +-20KHZ at 50dB
455KH2 -h-5.SKH2 at 3dB , -I-8KHZ at 6dB , 4-16KHZ at 60dB
455KH2 -1-2^2 bandwidth ■I-15KHZ at 6dB, +-30KHZ at 40dB
455KH2 -I-2KHZ bandwidth +-12,5KHz at 6dB , +-24KBZ at 40dB
455KH2 -i-UCHz bandwidth -»^4.5Kliz at 6dB , -i-lOKHz at 40dB
455KKZ +"limz bandwidth ■f-3KHz at 6dB , 4-9KHZ at 40dB
455KH2 -l-lKHz bardwidth 4-2KH2 at 6dB , -I-6KH2 at 40dB
455KH2 4-lOKHz at 6dB , +-20KHZ at 40dB
455KRZ 4-3KHZ at 6dB , +-9KHz at 4GdB
455KH2
455KHZ 4-2KHZ , 3dB bandwidth 4,5KHz -l-lKKz
10 •7MHz 280KH2 -f-50KH2 at 3dB , 650KHZ at 20dB
10,7M12 230KHZ -fr-SOKHz at 3dB , 570KHz at 20dB
10,7B4Hz
455KHZ -l-LKHz
435KHZ 4-lKHz
455KHZ
455KHZ
455KHZ -^2KHz
455KHZ
10.00
5.00
10*00
2.50
3.50
6,65
6.65
8.00
2.90
2.90
2/90
2,90
2.90
2.90
2*90
2.50
5,00
2,50
2,50
10*00
2.90
2,90
2.90
10.00
5 . 00
7 . 00
#«««««»«»««»+«»*«»»« •«««««««*»««»»»»«««#»«*•»««*»«##*««« «««#««#*#«««««««#*««««
SPECTRA PHYSICS INC, Model 088 HeNe LASER TUBES
BEAM DIA, .751*! BEAM DIR, 2,7MR
lOOOVDC -t-lOOVDC At 3,?MA
ROTRON WUFFIN FANS Model HARK^/HUZAl
POWER amnm i,6m^.
68 K OHM ira.Tr BALIAST
SKV STORrn*^ VOLTAGE DC
559.99
115 V7C 14 WATTS
105cm at 60CPS
50/6 OCPS
THESE ARE NEW
8S*'2FM at 50CPS
(fVI^l|z elect rai|ics
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
Toll Free Number
BOO-528-0180
(For orders only)
$ 7.99
"AU parts fnay be new or
surplMs. and parts may be
sut^stitutedi wilh cQ)mp<i^rabi« parts
if we are out of slock of an ilem.^
For information caft: (602) 242^3037
144 73 Magaiim • April, 1984
HEWLETT PACKARD SIGNAL GENERATORS
60GB
TS51Q
SOKHi to 6SflH2 in 6 Donds * -11, Output level adjustfltJie PJuV
10 5V Into b.D ohfns.BulU^n crtstot ccl Itjrator.™ -IOOOh^
ntodiiloUQn,
Seme OS cit}0ve Ckjc nas rreauency control feature to oil oh
opefoiiod mtn HP 87C^ SyncfifoniiEr.
imii iQ ii20iti?, 0.1uV^3.5V Into 50 ortB5.*-Q.5t occurocr*
&ullt^tn crvstoi ccUlirator, W-DI Qf puIs€ atjtuut.
iRuroved vers
stobHlty.loid
ion of Dooulcr
residual FM,
BOECOO to IV oytput. trnnrovefl
lOrtHz to i<55MH£ in 5
buHt-m crvstol col
.SV Into 50 oiifti.
tKinds *-il frequency accuroQV with
I bra tor r Can bs used with HP B/OflA
tontmuously mJJusttitila frow 4uV co
tiS0-123(»li2 .o.IiiV-D.^ Into 50
^CQlt&nitefr mjtDot.
dOO-ZlflfiWi Hi tit mxiv fcotiires Incloding cal United Dutwt
and oti ivxiulotlon enor^cteri sties.
1 650.00
fUQO.OO
I 500.00
(1100.00
I 7S0.00
f 500*00
Pi reel reodln? oncl dlreu control from LB to i*^GWl- tne
M*P>frl6fl feiJtures +-1.5d6 coli&roted output cccurocv from
-31^7d^ to -dBi^.Tne outDut is directly ctJH&rQted In mtcro-
vDlts and dBn> wuh contirmous .Fronltorind. sitoI^ aoerotion
freouency d:,ad accurqcy is '-IS and stacnitv ej^ceeds 0-D05!I-
/ C change In cmblent terffteroture^ Calibrated otlenuotor js
MUhtn +-tSd& over entire outDut bond. 50 qItjh lrtiD**dani;e unit
has Ifiiemal pulse motiuJcilon **lth rep rate variodle from 40
Hi to ^KHi.vtJflOible Duisewldthtj to lOuseciond voriooie cuUe
itelovtJ to JOOuseO.ExteftMil iDdulailnt? inputs increos ver-
satlSlty. * jre^OO
tl€X y«(»ITORJ£S T>S>2R£XlCIIIl€;S]SO.
0cse neoc^LS cote mtn d3ta to Peck ic to a IQB moics ma miv QWtr ec]uli?iHit,
Perfect for Airplanes * i^IiosJters * HcDile ftnios ^ or just die Teleptime.
niese Are Factory New In Seoled Boxes. Limited susply Unly *69,95
ciM'H;
electroqicsi
GIBB
&ia€
€2011
6KIB
B708A
Some OS dtsove hut later niadel,
t 6011. CD
5. a to F.6SH2 ronge^witrt call Dro ted outout and selection of _. __
DuUe-FM or squore wave mtKjumttor^. * BOO. GO
Sam as otove but later videL t220D.OO
7 ttp llGHj r^n^^iiitti cglibretea ouxmi m& ^i&^tim of ^ ^^ ^
pulse-fn or sf^jane mtmc «Ddiilatiirt. « /»i.ao
Sane s» obove but loier tBdti. sZ200,00
10 to 156Hi.lOnirf oulDyt verier wUh cailbroieq output ond ^,^^^ ^
pulse-squore wove or FH modulaiion, *4ZUO.og
SyncJirontier usfld with 605B,6C]aF,The synchronlaer is o
phdse-lpck fretjuencv stotitlizer which provides crystal-
osci Motor frequency stability to iiJVjmz jn the 6QeF sfgnol
genefotOJ'.flKisE locking eiimirtotes mlcropnonlcs gid drift
resulting in excellent frequency stobUlty.lfte 8703* IncfiKtes
a vernier uhlcfi cm tune tfti reference Oscillator over o range
Of *-0.251 DCTiilttlng freduencv ^ettofciUiy to 2 sorts in iO
to tne seventh. Provides a very stable signal tnat soilsf les
nof^v critical ap^tlcotlans. _
(wttn i^" goes or ^mi
< Without]
I 550.00
s 450.00
PK-10
NF-105F
ELECTftO»«IillCS EMC-10 Rf l/EHI RECEIVER
Lokf treouency onolyj!er cov^r no 20Hz to 50lCHz freouencv
rDngeȣKtendaDle to SDD 4<Hz In wideband modei
Empire Devices Field Intensuy Meter ^
Hos NF-IOS/TA,NF-105/TX.NF-iaS/Tl.NF-ia5/r2*NF-10&/n*
Covers WKiiZ to lOOOWi.
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EOUlRfCifT 1% HOT CALlSllATEfi.
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30 DA-rS intf rytipt_^ «■
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Mill I dipondlnp an b\£b or tna wapohl oF IhB P#tMfl<i Tim I FnulpmifH ia sAlppaddHly Iff iir iifld !■ tralgftt CoJiePt, unlwi pfiof
^n^ngcfliinl & hara bcwn FnjKJB and apprEinmd
FOftSmN DRDCAfi: Al« lurnign <?riter» rTiuiit tw |3'ii«ak9 mlft m C»N«'s Cnflck, <Qf Mnmiy Qr^Jar rfi^ilif aul m U.S. FUNDS OHIV
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plwfeM trKtude 2S% 04 Ui« ordwd wnOiad for stiip^ng, and nwnSiin^ CQ-D'i mtm shipped Am
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OKSarm muH ba KOOfncranMd by «
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RESTOCK CHARGES: If parts are raiumed to MHZ EUCrrHONICS, iHC. due lo cutiomar »rrar, im
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SMORTAQE OR 0 AM AGE; AH daima for shortagM pr tiMmgBa muat be mad* wffhir^ 5 &AVS o*
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^ AM parts rnay be new or
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sutisti t u t^ wi t Iv conif>af abie p^rts
if #fi are Qui o( stocK o( a*i ItenK"
Toll FrM Numbtr
aoo-52a*oiw
(For ontoiii only)
For infdrmalion call: (602) 242-3037
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■Sm List ofA^verTisars on pege t30
73 Magazine * April, 19S4 145
mmt
W2NSD/I
NEVER SAY DIE
ec//tor/a/ by W&yne Green
from page 5
TV-10 to see If Tve guessed
light about hand TV sets.
Speaking of Sinclair, the ab-
sence of Tlmex from The Win-
lef Consumer Electronics Show
was most obvious. Last year
they made a big fuss about in-
troducing the Sinclair Spec-
trum, only to change their
minds when the Model 1000
was bombed out by the \fiO20.
Timex, which has been quite
stand-offish to firms interested
in supporting their computers
with a magazine or software, is
paying the piper for this bit of
fotiy— to the tune of hundreds
of millions of dollars. They fired
the paopie who engineered the
disaster, but il Is probably far
too late now to recoup. Texas
Instruments pulled the same
stunt, with even greater losses.
Despite the dead and badly
wounded microcomputer manu-
facturerSp the industry itsetf
is still growing at about the
same 250Vo per year rate. It's
Just that Timex, Texas Instru-
ments, Atari, and so on are not
getting big chunks of It. Radio
Shack has been holding oa Ap-
ple is at the crossroads, gam-
bling everything on their Mac-
intosh.
Ail of this has been a bonanza
for hams who early on got inter-
ested in computers and who
have jumped at>oard the Indus*
try. The micro Industry is rife
with hams, as 1 see when I'm
stopped by hundreds of old 73
subscribers at the Comdex and
CES shows, fvfany claim that it
was my editoriais and articles in
73 that got 'em into comput-
ers—and rich.
The next big field, as IVe writ-
ten before, Is going to be conv
muntcations. Some ham is go-
ing to design a simple radio
system to automatically send
messages and parlay that into
a S500 message communica-
tions system for private aircraft
which will eliminate the need for
voice communications tjetween
pilots and towers. This chap
could easily get extremely
wealthy. The nice thing about
this is that everything needed
for the system has already been
invented. All it takes is an exper-
imenter to put it together, test it,
and find a venture capitatlst to
back him. Eureka! Millions,
And, you know, a kid of 15 could
doit.
Lef s get some work done and
get some articles in 73 to spur
more experimenting. It's possi-
ble for hams to again get up
front in developments and re-
gain some of the prestige we
once had The FCC Is off our
backs now, so we can experi-
ment.
COME FLY WITH ME
Are you looking for some
small electronic or ham product
from Asia which you might im-
port and sell by mail order?
Quite a few big businesses have
been built In the last few years
doing this— JS&A, the Sharper
Image, Markline, and so forth.
The best time to see the smaller
Asian firms is in October during
a series of consumer electron-
ics shows.
These shows are set up so
you can attend four of them in
the four key Asian electron-
ics manufacturing countries^
Japan, Korea, Taiwan, and Hong
Kong—one after the other, all in
two weeks, TTiis could be two
weeks which might change your
Ufa— if you have some entre-
prenaurial spirit
Commerce Tours has been ar-
ranging trips to Asia which bring
people to these four shows for
several years now. Tve been go-
ing on them for five years and
have been very impressed by the
fine hotels, the number of spe-
cial events and meals, and the
planning of every detail by the
firm. And the price— i don't see
how they provide so much so
reasonably.
I've encouraged hams to ac-
company me on these trips in
the past and every one of them
has had a great time— often
meeting with Tim Chen BV2A in
Taipei, shopping for electronic
equipment in Hong Kong at in-
credibly low prices (1 have my
shopping list already made out),
loading up on dirt-cheap Apple
boards, and so on.
The tour is timed to get you to
all four of the shows, complete
with all transportation, This is
about the only real way for you
to meet and talk business with
the hundreds upon hundreds of
small manufacturers In Asia,
This is where you may find some
brand-new products which
haven't yet migrated to the
US— or perhaps some lower-
cost versions of popular items.
The whole trip costs $2,000.
That includes ali transportation,
first*class hotels, lavish break-
fasts^ a numt>er of other meals,
show admissions, several op-
tional shopping tours, and so
on. Bob Chang and his family,
who organize electronics and
computer tours, are at home In
Asia and thus have everything
under superb control
We've always had a group of
hams on these tours, which usu-
ally run from 150 to 250 in num-
ber. This year weYe going to be
joined by a group of Australian
amateurs, so we should have
even more fun. And wait until
you see the price of Japanese
ham rigs in Hong Kong*
The trip leaves California Oc-
tot>ef 2 and returns October 16,
You can leave from either San
Francisco or Los Angeles. Fur-
ther, If you want to take some
extra time at the end of the tour,
you can come back for a small
additional fare any number of
ways. I've made low-cost side
trips to China, Macao, down to
Borneo, stopping off at Sara-
wak, Brunei, Sabah, and Manila,
or via Bangkok and Singapore,
Hawaii, and so on. Why not add
a couple unusual shopping
stops and visit some rare DX
hams? They'll love It and so
will you.
Please let me know as soon
as you can if you are planning to
join me this year. But watch out,
I'll be looking for things to im-
port, too. Drop me a line for de-
tails: Wayne Green— Asial, 73,
Peterborough NH 03458.
Operating? Japan Is still
tough, but we might be able to
make it in Korea if you ask
ahead. Taiwan is still tight.
Hong Kong is a song—just
bring a copy of your license.
Yep, they have two^meter re-
peaters there*
Lightning Protectors
Transi-Trap^**
R-T. HV
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LT, HT
Model LT (200 W) $19.95
Model HT {Z kW) . . . . .$24.95
Model R-T {200 W) ...529^95
Model HV (2 kW) $32.95
(Add S2.00 foe p:)Stag€ in U-S |
See Data Sheet
for surge limitations^
For Antenna and AC Lines
Modd
MACC
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P O Bom 571, CefiterviUe, Ohio 45459 • (5t3> 435^772
146 73 Magazine • April, 1984
Attenti on
Moonbouncers
and Satellite Communications Enthusiasts
Introducing New Ultra High
Performance Antennas
from KLM Electronics, Inc.
KLM Electronics is fueling the Moonbounce and Oscar 10
revolution with Antenna Equipment that delivers truely
Out-of-This-World performance.
For the Moonbouncer, our New 2M-16LBX is designed
to be the highest gain 2 meter antenna available on the mar-
ket today by more than a full db, making the 2M-16LBX an
outstanding performer as a single antenna or in Moon-
bounce (EME) arrays.
The New 432-30LBX follows the same pattern as the
2M-16LBX, and soon will become the industry's standard
of comparison.
Featuring straight forward construction, and an innova-
tive tapered boom that greatly reduces windload and adds
strength and durability. Virtually unbreakable, insulated,
3/16" rod parasitic elements are anchored through the boom
to insure years of trouble-free performance.
For the satellite enthusiasts, the 2M-22C high gain 2
meter, circular polarized antenna, features the same rugged
construction and total flexibility as our very popular
2M-14C with a 2db increase in gain.
Four or more 2M-22Cs make an excellent array for
Moonbounce (EME) by elminattng Faraday fading.
Fiberglass/aluminum stacking frames are available as
well as 2 and 4 port power dividers and phasing harnesses
to optimize the performance of these type arrays. Watch
for our new elevation drive system coming soon.
432-30LBX
BANDWIDTH ......,.*., , » * , ,,,♦,*,»,»»♦ 430-440 MHz
BEAMW IDTH 2(f
FEED IMP , , . - - . , 50 ohms unbal.
BALUN ..,..,. included
BOOM LENGTH 21 ft. 9 in.
F/B . . . . 20 dB F/S * * 35 dB
VSWR 1.5: 1
WINDLOAD , L43 sq. ft. (typical)
TURNING RADIUS , - 12 ft. 5 in.
WT. (Ite.) 9 lbs.
2M-22C
BANDWIDTH . , , * . 143-146 MHZ
GAIN . , , (144 MHz) 14.8 dBdc
BEAMWIDTH (V) 28^ (H) 33**
FEED IMP ................ , , , ♦ * . . 50 ohms unbal.
BALUN 4:1 RG303, Teflon
BOOM LENGTH 28 ft. 1 in. (tapered)
VSWR - - ^ 1 4:1
WINDLOAD (H) 1.75 sq. ft. (V) 2.44 sq. ft.
WT, (lbs.) . . 10 lbs.
TURNING RADIUS . 15 ft. 6 in.
2M-16LBX
BANDWIDTH , . 144-148 MHz
GAW , , 13 dBd
FEED IMP , , , , SO ohms unbal*
BALUN (2) 4:1 coax
BOOM LENGTH 19 ft. 1 in, (tapered)
VSWR LS:1
WINDLOAD 1 85 sq, ft.
ELLIPTICITY 3 dB max.
CIRCULARITY SWITCHER CS-3 included
WT. (lbs.) , 11 lbs.
5^^ all our new antennas and equipment at the Dayton
Hamfest, Booth #25.
IMMI
ekctrofucs^ Inc,
P.O. Box 816
Morgan Hill, CA 95037
THEREIS
A DIFFERENCE
IN QUARTZ CRYSIALS.
Internationars leadership in crystal design and production is syn-
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controlled calibration and a long list oi tests are made on the finished
crystal prior to shipment
That is why we guarantee International crystals against defects, mate-
rial and workmanship for an unlimited time when used in equipment for
which they were specifically made.
Orders may be placed by Phone: 405/236-3741, TELEX: 747 147.
CABLE: Incrystal ■ TWX 910^831-3177 Mail: International Crystal Mfg.
Co.. Inc., 10 North Lee, P.O. Box 26330, Oklahoma City, OK 73126.
Write for Information
DEDuD
^3B
tlflERNATIONAL CRYSTAL MFG. CO., INC.
10 North Lee, P.O. Box 26330, Oklahoma City. OK 73126
REPEATER
CONTROLLER
«,<<v<^
TiTriMf^'wir''"'"'''''"^"'^'
'^rHA MSWX
REMOTE BASE
REMOTE BASE
^
Does your repeater have a remote ba$e? Ever wonder what you're missing?
The RC-SSO Repeater Controller lets you attach transceivers to your repeater to operate
other frequencies through your repeater. Control the fraquency and mode with Touch-Tone
commands, and get readbacl^ from the system in synthesized speechl
"We have an Azden PCS-2800 for ten, and a Yaesu FT627RA for six meters on our 220
repeater", reports WA1RYZ "We've worked the Marshall Islands and Norway on ten meters
from OLir HT's. And we'll t>e able to run high power on six meters without worrying about TVf,
WB5UKI told us "We llnl< our Dallas machines to outlying repeaters for our SKYWARN net.
The weather sen/ioe can talk directly to the spotters far away to get early storm warnings."
From N6E2J, "With our two meter remote, we can check into two meter nets through our
220 repeater. We can get on any two meter frequency from our 220 HT's."
Link up with other repeaters . . . extend your range on simplex frequencies ... let your group
share equipment for other bands . . . even work DX from your HT.
No one else supports synthesized remote bases for your repeater
ACC is changing what repeaters can do for YOU.
MAKE YOUR REPEATER A WHOLE NEW ANIMAL
WITH THE RC-S60 REPEATER CONTROLLER
Call or write for detailed specifications
QCC
advanced
cornpiiter
contrDls.inc
lost 6 Northrldge Square # Cupertino, CA 95014 • (408) 749-8330
U S.pAT. N0 4349S25
i
as a M^biie Arna^isr Radio
p3fe^o ai^ alwayE^^^
tioM Em Mtgi
Th$ ATosI Convenient
AntennB far
motile Work
ftfT^
J
' ■ N, mM.". ^'-ifi
/
Whether
you ^Tt driving
a fuii-sizfe van or a compact car,
you can't beat the Spider^** for con-
venience. Once it is tuned for 10,
15, 20 and 40 (or 75) meters, you
just switch from band to band on
the transceiver — ^the antenna fol-
lows by itself-
A Truly Practical
MntennB Adafitei
If you now have a
single - band
mobile an-
tenna with a
Vi^ mast, the
Adapter will
convert it in-
to a modem
4-band an-
tenna. Complete with 10, 15 and 20
meter resonators — use your present
40 or 75 meter coil for the fourth
band*
Mow B 7S Metet Resonator
In response to requests for 75 meter
operation from many Spider^"*" users,
a 75 meter resonator will be avail-
sible in April.
cpwmtami^m
MULTI-BAND ANTENNAS
7131 DWENSMQUTH AVE., 463C
CANOGA PARK, CALIF., 913Q3
TELEPHONE: (818} 341-5460
148 73 Magazine * April, 1964
.:-:r-::-:'--?::-:-^-j;.*;:.';'";^
Whether sending (^l^smiim^m^^^:
the new 1984 CALt^BpOKS a^^;SH^p^
active amateur. Respected far a<:cyr:3fe^
beginnings of amateur^radlPt:thB;ti/;S.^
CALLBOOKS list the adarei^s frtfornriatl^n^^
800,000 hams around the y^or0-m-m^^
format. Not simpiy a reprint of -fic^t^i^jp^
CALLBOOK listings are taken: f r om; i tJif r- '^
extensive master files, updated con tifiuoMS^^^^^
bring you the latest information srvaMiabfe^r-;
As an added service, optional supplements v*^iH
your 1984 CALLBOOKS up to date thrd*!^
the year. Published March 1^ June 1^,::
September 1, each supplement ccJiiW^fti^
activity for the preceding 3 month^^rfh
of new licenses, call chan^i;^ Snd
hanges are listed iN each iss^^v
The 1984 CALLBOOKS are iQad^^?^?^^
features for TsgncliBvvers iand QK|
Order your copies novif^ $m-y^i:4
order directly f rom th^- pafeliiii^
i
YOU Wm'T
425,000 current U.S. Listings ♦ 400,000 current Foreigri Llstmgs »
Then & Now call changes • Silent Keys ♦GemMSTofAmi^teu^
Standard Time Charts • International Postal: InforrrJ^tion::;^^
Table tif Amateur Pref tx AHocations ♦r iPref ikes of the World *
■'^^^■^^^^..1^^^^^^^ ^^^^*
Publication; December 1, 1983
D Single 1984 U.S. Callbook
D Single 1984 Foreign Callbook
D SPECIAL OFFER; Order both 1984 Callbooks
at the same time for shipment to one address.
D Set of 3, 1984 U,S, Supplements
DSet of 3, 1984 Foreign Supplennents
Name
fncluding shipment
to U.5.A> points
$23,00
22.00
41.95
12.00
12.00
Illinois residents,
incl. tax & shjpping
$24,05
22,99
43,99
12,60
12.60
Including shipment
to foreign countries
$24.50
23.50
43.45
12.00
12.00
Amount enclosed
Address
radio amateur
IIL.
U
^^61
oa
Dept B
925 Sherwood Dr., Box 247,
Lake Bluff, IL 60044, USA
V/SA
Teh (312) 234^6600
t^See List of Adveftissrs on page 130
73 Magazine • April, 1984 149
Kantronics Interface
The Interface For
Apple, Atari, TI'99/4A, THS-SOC,
VIC'20, and Commodore 64
Computers
Interfiicri' II is i\w new Kantroniczi LiixnaiLi^^fiuei -lu
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Evi?Ti the II riiinq ai lox u/ill be surpi
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em even
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internal microctirnpiuer gives the unit data
processing capabilities to send and receive
in four coded amateur forniats; Morse code,
Radioteletype. ASCII and AMTOR.
Sample terminal programs for IBM,
TRS-80 Model III and IV, Kaypro, and other
computers are included in the manual
Enhanced features can be user defined by
altering the terminal program, giving you
flexibility to program for your specific needs.
The Kantronics Universal Terminal Unit
can send and receive CW at 6-99 WPM;
RTTY 60, 67, 75, 100. and 132 WPM:
ASCII no, 150. 200. and 300 baud: and
AMTOR, Dual tone detection and our
unique bargraph tuning system make tuning
fast and easy- Additional LEDs indicate
Lock and Valid status during AMTOR
operation. The RS232 port is TTL or RS232
level compatible*
If you've been waiting for a Kantronics
system for your computer, the wait is over.
For more information contact an Authorized Kantronics Dealer.
or write:
Kantronics
1202E 23rd street
Lawrence *<aosas 66044
international)
from psg& 96
DX from 7:00 am to 9:00 am at first, and
then Eater perhaps for another hour. Later^
it is expected that there wiSI tw a new
repeater for the lOm-FM band (whjcti 1
understand has already t>een purchased^
go that daily DX contacts can be made
continyousty, especially with frlen-ds in
the United States, Question: Would you
t^e able to recommend a frequency that
we could set our repeater on tor lOm-FW
ys6? If so, please contact me immediately
with the information and I will have It
relayed to the proper authorities. We need
to have &n idea ol a frequency that would
be preferred to our fellow hams in the USA
as well
REPEATERS tM MEXICO CITY
As you may know, Mexico City Is said to
be the largest city In the world (popula-
tion-wise). Some have said that there are
more than 16 million people (taking into
accouM the metropolitan area as well as
the surrounding areas that are practically
part ot the city itself). Well, if you come to
visit us someday, you'll know what I
mean] Better freeways and overpasses
are qonstantly heing const ructed^
adapted, and changed. To Illustrate the
point, I was driving along with my father-
in-law one day (he's a native from Mexico
City). Well, we got lost for atfout 2Vi
hours! So you can imagine what it's like^
even when you think you know what
you're doing! (Unfortunately we did not
have our 2-meter equipment with us at the
time. Last time Til make that mistakel)
SOj where you have a big city, you have
a larger han:i population as well, and even
a few repeaters and radio clubs who own
them. (See Fig. 1 for a list of clubs and
their repeaters in Mexico City,) 01 course,
you have to be authori2ed by the Mexican
Communications Department in order to
use your equipment here in Mexico, Be
sure your papers are in order before vaca-
taon time unless you |ust want to go "all
ears." The (ocai operators here are very
friendly and sociable and enjoy having for-
eign visitors drop in. And it's nice also if
they have personally been in contact
(QSO]i with you beforehand, which makes
it alt that more interesting.
With most radto clubs that I have known
in different parts of the country, It's a cus-
tom to get a few of the members together
for a cup ot coffee and maybe a smalt
meal (tacos anyone?) whenever foreign
colleagues show up. It's a real social oc-
casion and sometimes ver/ interesting. At
one celebration that the Satellite Radio
Club sponsored, Marclano XEIGIY flew
his jet overhead a couple of times as we
made contact on two meters with him t>e-
fore his departure. I'm sure you'd enjoy
good^ld Mexican hospitality! And your
friends wouid enjoy sharing it with you!
THE NETHERLANDS
H. J. G. Meerman, Jr. PD&DDV
Zan^ivoort^rweg 33
2111 GRAsrdenhout
The NetheriaridSf
THEVRZA
This month I would like to write some-
thing about the VRZA (the Vereniging van
Radio Zendamateurs). As you may already
know, there are three amateur-radio so-
cieties in Hoiiand and one of them Is the
VRZA, Translated into English, these let-
ters stand for Union of Ham i^adlo
Amateurs.
The VRZA was founded in 1951, about
33 years ago. The number of members is
enormous for a small country Wke ours. As
far as i itnow^ they have 450O members,
but by the time you read this the number
will no doubt be much higher. Well, as you
see, amateur radio is a fast-growing style
of lite in Holiand,
The VRZA has also its own magazine
which is sent out to members once a
week, it is full of news and technical arti-
cles concerning ham radio. Many of the
buiid-it-yourself projects that are put>-
llshed in this magazine (called CQ-PA) are
from VRZA members. Often the VRZA has
circuit boards available for these build-lt-
y our self projects, for cost price Another
service is the seiling of hard4o-come-by
parts, such as special coils, ff Iters, tran-
sistors, etc.
PACVRZ/A Is the callsign of the VR2^
club station. This station is on the air ev-
ery Saturday morning on the 80- and 2'me-
ter bands with news on phone, CW, and
RTTY. Aiso a code course is given.
AWARDS
Although the VRZA has a large number
of awards, there is one that deserves s pe-
el ai attention, namely the WAP Award
(VVorked All Provinces). This award is
avallabie to hams who have worked all
Dutch provinces or to SWi^ who have re-
ceived amateur stations from ail prov-
inces. For those who wish to know more
about VRZA awards or about the VRZA it-
self, Hi give you the address: VRZA,
Postbus 61420. 2506 Ak Den Haag, The
Netherlands.
Don't forget some IRCs to cover the ex-
pense of answering and mailing your let-
ter.
DUTCH QRP ACTIVITY
For the QRP enthusiast in Belgium, Hoi-
iand, and Luxembourg, we have the Bene-
lux QRP ciub {BQC). This club [s especial-
ly for amateurs who like to work with Eow
power. An output of 5 Walts for CW and
ID
Frequerwy
Radio Club
X£1RPV
14a31/.9l
Aztec Radio Club
XE1ERA
146.34/,94
Aztec Radio Club
XE1RUL
1 47.72^.12
La Salle University Radio Club
XE1RSC
147.63/.03
Satellite Radio Club
XEITU^
147.a4/,24
l^tfn American Tower Radio Club
XE1VHF
i46.28/.ae
VHP Association
XEIYG
146. 16/. 76
VHF Association
XE1UHF
449.100/444JOO
VHF Association
13.4 Watts for S3B Is the maximum power
that can be considered as OBP.
The Benelux QRP club gives advice to
Its memtjers^ organizes QRP contests,
and has its own low-power network every
Saturday morning at 0930 UTC Members
of the club use the International QRP tre-
quencies: 3,560. 3,690, 7,030. 21,060,
21,2B5, 28,060, and 2S.Sa5 MH2. The BQC
is aiso a member of the World QBP
Federation, The address of the BOG is: PC
Box 15, 2100 Heematede, The Nether-
lands.
Fig. 1 Rep&at&rs in Mexii^o City.
NEW ZEALAND
a J. iOes) Chapman ZL2VH
459 Kennedy Road
Napier
New Zealand
As this column Is befng prepared during
December, white our northern-hemi-
sphere confreres are ceEebratinQ: the
Christmas festive season in true forrm
with the tradttionai winter scenes and
trappings, we here down under celebrate
under somewhat different conditions.
There is no snow, and a large part of the
populace heads for beach and lakeside re-
sorts to celebrate Christmas In tempera-
tures of 20* C plus, depending upon the lo-
cation.
But no matter where we are in the world,
as tar a^ seasons are concerned, Christ-
mas will aiways constst of a Christmas
tree trimmed with lights and artificial
snow, Santa Cfaus in his heavy red uni-
form, complete with while t)eard and hat
(always a very hot lots), with his sleigh full
of presents for ail, and a huge dinner on
Christmas day of roast turkey, chicken,
pork, or lamb (depending upon choice)
plus vegetables, followed by Christmas
pi urn pudding and complemented with the
usuai beverages.
Although it is somewhat out of season
for us here in ZL-iand to have a huge hot
midday meal when the weather would In-
dicate a cold-cuts-and-saiad-type meal,
followed by cold sweets, most New Zea-
land families stiii stick to the traditional
dinner and ceiebrations. following the tra-
ditions ot our forebears who, in most
cases, came from the northern hemi-
sphere, Christmas in ZL is also the main
holiday sea son ^ most of the commercial
concerns closing from Christmas Eve un-
til about January 10th for their anniual holt-
day, with the exception ot small staffs to
handle urgent lausiness.The retail section
Of the business community goes on as
usual, although aimost everything closes
dowrt completely on Christmas Day.
BITS W PIECES
Recently NZART obtained permission
for radio amateurs to play chess against
other radio amateurs on the air. This is an-
other step in the expanding international
group: Chess Amateur Radao Internation-
al (GARI), whose headquarters are at PO
Box 6S2, Cologne NJ 08213, USA. This
group Is encouraging participation in on-
air chess games between radio amateurs,
and the group has interested members
from W, VE, HH, I, OH. VK. ZL. DA, KH6,
and KL7. Write to the address stated for
further information,
Th$ first CARl Oceania tournament was
hetd In August, 1953, with stations from
KH6, VK, and ZL participating. Now in Its
second year, CARl has 160 members, has
regular weekly and dally schedules, and a
special "contact wheel" for finding chess
QSOs. A rating system has bean estatn
1 1 shed and regional tournament directors
appointed in seven areas worldwide. The
founder and first president of CARl is
Vince LucianI K2VJ. It is Interesting to
note that amateurs in fslew Zealand were
playing chess over the air prior to 1932,
and an article in Br&ak-in, the NZAflT offi-
cial journal, in August, 1932, covered the
activity, in the Intervening years, the actlv-
ity went into recess untlllt was revived by
the formation of CARl.
Morse code is alive and well —so goes a
report from ZL4FC In Break-in on the use
of Morse code In commerclai communica-
tions, particularly marine communica-
tions, here in ZL. There are still profes-
sional brass pounders here, employed by
the New Zealand Post Office at three of
the four Marine Coast Stations operated
by the f^ZPO, and many of them are ama-
teur-radio operators, too. Morse is the
main mode of long-distance high-f requen-
cy communication and still proves reli-
able when all else fails.
Morse is the main mode of communica-
tions at Awarua Radio, situated at the
southern end of the South Island and, to a
lesser extent, at Auckland and Wellington
Radio Stations. The New Zealand Post Of*
fice stili trains operators at their school in
Wellington, where the trainees have to at-
tain proficiency in the code at 25 wpm
tsoth sending and receiving, over a 10-min-
ute test period, with only two errors al-
lowed. This high standard of f:)roficiency
in Morse has been unchanged since the
days of th^ telegraph I and line circuits,
when the Post Office employed hundreds
of Morse operators on circuits throughout
the country.
Morse is on the decline in the commer-
cial communications area, with the in-
roads made into Morse traffic by Telex
[SI TOR) and satellite traffic, but the big-
gest impact on marine traffic has been the
decline in the number of ships now in
world fleets. Two vessels now do the job
of 10 ships since the concept of carrying
cargo in containers was introduced, and
this has had more impact on Morse traffic
than anything else. But as the writer of the
Bre^k-fn article says, ''Morse Is alive and
well, and the skills of the brain and fingers
of the Morse operator still play a part in
modern technology."
The historic Space-Shuttle flight of
Owen Garriott W5LFL during the latter
part of November was followed with great
Interest in ZL, but as far as can be ascer-
tained to the date of this writing, no ^L
was able to record a QSO with W5LFL,
and I don't think any ZL was^ successful in
copying him, either. But I am awaiting
confirmation of this trom the VHF and
satellite experts elsewhere In the country.
An extract from a lecture sponsored by
the Auckland University Foundation, giv-
en by the distinguished space scientist
and ZL, Sir William Pickering, congratu-
lated New Zealand communications engi-
neers on the development of a hand-held
radiometer, produced as a joint venture by
the government Department of Scientific
and Industrial Research and an Auck-
land electronics firm, Delphi Industries. It
proved that local New Zealand industry
and engineers are capable of competing
with the world's best. Trie newly devel-
oped radiometer is to t>e tested on a forth-
coming space-shuttle flight.
In a recent issue of one of the popular
US amateur magazines, I noted In the DX
column that some concern was expressed
by a prominent DXar about the Kermadec
Islands and the possibility of them being
the likely subject of a DXpedition In the
152 73 Magazine * April, 1984
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73 Magazine • April, 1964 153
n^ar future. 1 was somewhat dl9ma¥«<l to
read thka report when there Is at present a
reatdent amateur on Raoul laland at the
weather station wtio was actkvs for
shon periods during the latter part of l9dS
and Who Intenda to be rTK>re active durlr>g
1984, Ha is WawIcK ZLaAFH/Zl^AFH
(n«w call sign of the Kannadecs), and ao
cording to my Infoimatlon, after the set-
tting-in period Just before Ctirlstn^as, n&
was to gat antefinai up and be as active
as his duti&s pe^rnit Ofi rr>ost bands during
1964. (f ^/rof '« fTOfe: See ttm Australia cot-
ttrnfit this issue.}
The Bom City NZAHT Ccnfefertce wtll
be fwld in PaJmerston Nonh ffom June 1
to4« 1984. Details of the conferance vefiue
are as foUows: The Rose C4ty Conference
wH} be hefd at the Awapgni Racecourse
and will commence with a receptioci^ reg-
iatration, and a wine and choeee evanlng
on Friday nlglit. The formal tMJSlnats of
t^NZARTwIII ba condticted on Saturday,
followed by ttie Gra^ Dinmir and Dance
In the eventrrg. On Sunday, ll*» AR6C,
QTC, WARO. ar\d ott>er rfieetir^ will take
ptaca. as well as oihaf activiiie? including
the transmitter hunt (fox hunt| and a
mobiia rally. An inforrtiat social arKt prize^
givtng de&qion will conctuda Sunday's ac-
trvities. Enquiries for accommodation,
etc., lo PO Box 1718. Patmerston North, as
soon is poaslbli.
NEZCHEQ 63, !t>e »cofid Mtnngal
Nofth Afnencar!/New Zealand County
Hunters Ey otjaH OSO Party mentiorwd In
a praviouft column was a greai succ^s^- It
was held over the US Labor Day weekend
fit Shelton, 50 mt(as west of SeaTtie,
Wast^ington, ar^d tinish&d wHh a banquet
at the AlderOrooh Resort Hotel on Sunday
night trv all, 17 2L hams and VLs were
amongst the 40 US and ZLa at the QSO
Party. In the US group were some from a&
far away as Oklahoma and Alaska, The
weekend activftlea war^ mainly socja!
with a Nttle "hamming" at the otfictal
County Hunters station and plenty of eye-
b^lling with those so orten heard and
worked on lt> and 15 maters. The festivi-
ties ware continuous fun Irom dawn until
almost dawn.
It b reported that one station which
worked the Convention station SfilO he be-
lieved that the whole gathering was in tha
stale of Intoxication, but he was Informed
that no, the station was In the State of
Washington. At the banquet, after the
obligatory short speeches, the fun cli-
maxed with awards presen tat ions. Spe-
cial aw^ards were mad^^ lo Jay W7KBC, the
first-ever North American County Hunters
W7KBC Award, in honor of Jay being the
first North Americati amateur lo work all
1 12 Mew Zealand counties for the NZART
Coynliaa Awards
A special gift was made by th« attertd-
Ing ZLs to the host, Toim KB7Mrf, ar^S alt
other members present e^cchanged souve-
nirs and gifts. The next convention {KEZ-
CHEO 05) will be in Houston, Testes, and
moat of !t*e ZLa »r>d Nortti Americans
preisent at the t983 convention plan to be
pre^nt again.
Anothef member of tr» Did Timers Club
fias Jo^rted that eliia band o1 eo-y«ar J util-
ise Ceftiticate f^ioers Ha is FranJc Bell
2L4AA. {tm first licensed amateur in ZL,
wtio received his license in January, 1S23.
Frank ia a llle rrMmber of ttie OTC and is
Its Immediaie Past Patron, 50-year certifi-
cates have also bmn lss%i«d to J. rRoilot
Schofte^d ZL1 JK, Artfiur Allen ZLU a and
Arthur Lyes ZL3JD.
Silent Keys recorded rec«nlly were
John Palmer ZLTKV, Norman Walding
ZL2GZ. Sam Hopkins ZL2AQX, Stan
French ZL2JB, and &»c Poof ZL2MZ
POLAND
78-200 Biatc^ard
PQisnd
SCOUT RADfD AMATEURS
Soout radio club acttvity was sus-
perKled alter martial law was declared In
Poland, bvt even before a mmsfatement
of individiiat ham activity, 30 Scout radio
clid» got licenses. Two cofitests. ^"Scout's
Wave" and "Silesia^Polish Scouts' Assoc^
ation,** wwB organized this y«ar. Amon^} In-
dividual stations, th^ other contest was
won by SPQEMI. The best club statJon was
SP7KTE and the best momitof was SP7-
iSOlfIC Regularly on MofMtays arKt
Fndays at 1700 GMT on 3700 khtz. the so-
called Scouts' Circles taJce place. An ex-
t^iange of training radio telegrams on
3S50 kHt CW on MofKlays, Wednesdays,
Thyrsdays, and Satuirdays, afid oa 3700
kHz SSB on Tuesdays and Fridays begins,
always at 1E00GMT,
Scout radio stations working Oin 3-5
MKz revived the activfty of Polish hams
this fiummer. Many young hams in Scotit
uniforms prac^ticed theif skills In camps
competing for the certificate, "Scout's
Camps " One of these camps was orga-
niied by the Communication Committee
of the Polish Scouts Association (PSAJ to*
gather with tha Kcmin Troop of PSA In Ml-
kofzyn, near Konln. 15 Scouts and 2 In^
stmctors fro^n tha Korin, Lsszno. and
Poznan troops were to take part In a
school of Scout communication and ama*
teur-radlo looatlon. Final I y^ 49 partici-
pants for the communications course and
10 candidates for referees of amateur-ra^
dio location gathered in this beautiful
spot,
Psrtict pants at the Mikorzyn camp ware
taught all i^inds of Scout walking, tele-
phone, and radio communication, Short-
wave Instructions* treated at this camp as
an Introduction, will be continued at a
winter camp in KieKrz. Instructors were
confronted with the problem ot teaching
communications courses to budding nov-
ices of the communication art, 13 lo 16
years old. In spite of nearly 10 compulsory
lessons dally, these Scouts elected to
have supplementary sessions. Radio sta-
tlor^ SP3ZCy/3 was establish ing contacts
during the time of the camp. Films on priri-
eipies of electrical engineering and elec-
trantcs rounded o^t theoretical and prac-
lical course.
A final session took place on Augusi
iihL Candidates for feCerees of amateur^
radio location prepared and carried oul
ttie final contest on ZS MKi and 144 MHz
by themselves. Other participants at tfie
school acted as compelitors and proved
ttrair skills before the cqmirig Badlotqca-
tion Contest of PolarKl Ski I Jed stall and
the tovejy noighbortrood of SJesinsl^le
take contribu^ted to a nice atniosptiefe at
the camp. Many Polish arvj foreign visi-
tOfS 0hesie last from (Germany and BulQar-
la) wont and saw their friertds.
Some months ago i mervlior>6d Itw
SPDX Contest 1983 that was doubtful
tfiea Among indtviduaJ statlor^s taking
part in this rajntest were SP/AW* leading
with 609 points and 232 ceflif^cates,
SP90H (573 and 138), arKl SP9A0U (557
and ia^ Tfie best club station of the corv
test was SP7KTE (6eC and 201), and
among monitoring stations. SP9"33&4'KA
(132 and 40)-
SWEDEN
RaoB fcVende SMiCOP
freiavagen fO
S-J55 00 Nykvaffi
Sweden
SSA ANNUAL MEETING
The Swedish amateur radio league,
SSA. is twldtng Ha annual rT>e«Tit>ership
rffeeting this yeaf in th« city of Falun in the
provtnce of Oaiarna (D alec art ial The
meeting is taking place during tfie wMk>
end of April 14-tS. The hosting Falu
Radioclub Is celebrating lits 601 h anniver-
saiy.
The province of Dalarna has played an
imporiani role In Swedisi) history. The
famiers were willing to fight for their free-
dom and. among olhet kings, Cu^tav
Wasa managed to get Ihem to uprise
against the Danish Intruders ^n 1521. To
oetefacate this, every y«ar over 10,000
skiers compete m th« world's oldest and
lATQBSt cross-country ski race from Salon
lo Mora, a distance ot close to 90
kJloowters fSS miles). Besides the regular
fTkeetlng on Sunday, there will be ex hi bi-
ll ons. spsakers, women's activities, and
the Saturday night banquet. Dal am a is in
the SM4 call area.
PACKET RADIO
The Softnet User Group at the Universi-
ty Of Unhoping l» Jnvlting everybody imer-
ested in experimental packet radio for
twth ground and satellite systems to
D<PRAN S4. this year s Softnet workshop.
The Experimental Packet Radio tJet-
work Symposium ts taking place in the
city of LInkoping (SM5 call area) on May 26
and 27. 1964. Planned subjects tor semi-
nars are packet radio, network control and
routing, distributed processing, propo-
sals for standards, and Softnet. The Swed-
ish high-iechnoiogy aeroplane and corn-
put ar industry, SAAB, Is located In LInko-
ping,
TELEPHONE INTERFERENCE
Teieverket is the National Swedish
Telecommunications Administration and
has the monopoly for telephone commu-
nications distribution in Sweden as well
as being the licensing authority Tor radio
communications. T^ieverkei ie also a
manufacturer of telecommunications
equipment as well as the approving au-
thority fof equipment manufactured by
others that is designed to be connected to
theif syslams.
Only a couple of years ago the tele-
phone system in Sweden allowed modem
push-button tet6fjlton«s. Those ha^, of
course, turned out lo become very popular
and are raplaclr^ the old rotary^lal
fitiofies. Tefeverket manufactures a pust^-
tHJlton phone called Oiavox, about the orv
ly o«^, fot the time ttalng, appfow«d for
ihelr own system, I.e., the only systam \n
These rww telephones made by Teiever -
kel and spreading wary npidly are ol great
conoeffi to us acthre radio amateurs. The
Olavox telepfvorw is exiremeiy susceot^-
t>ie to rf. Televeilcet Is now very well aware
of th^s fact and is irying to take care of
problems when inter1efa#^ce eompiaints
are filed Before then, fKiwevef, tf>e inno^
cent ham operator has had anottter con-
frontation with his neignows Everyone
that has had such an eK|>erience can lett
Ittat there are more pleasant meetings
than trwse, l fsad one fellow irom Teiever^
kel workir^ on my DIavoJt telephone tor
2Vi hours without complete success. The
interference was there either when
operating on 14 MHz or 2d MH^. Consider-
ing the low sunspot cycle we are In now. I
chose to have the Interference on 28 MHz I
tt Is very unfortunate to have this unnec-
essary Interference problem, especially
now with the growing popuiaflty of video
recorders that may become our worst RF1
problem to date. Ttie ^deo recorders
seem to be n'>ore susceptible to rf than any
of the other home electronic equipment
we ha'ire fought so far.
WINTER CON DfTIONS
In this arctic region, aurof a boreaHs Is
very common during the wiriter season.
This dark time of the year favors the low-
bSTKl DKers propagationwise. It is even
poesjt^e to wofk tt^ leO-meter band 24
hours a ilay during several weeks around
Christmas.
As a rule, you can say that "the ckMMT
to the equatof you are, the belter short*
wave propagation you have." Being a DX-
er, Ihring tttis far north as we Scan^iruh
vians do is sometimes toygh. About the
only time we have a more lavorabfe sltua-
Uon than ttie south Eufopaans is when
propagation to tf>e Pacific is over the
f^orth Poie. Til** 1$ comn>on during early
morning local time in tf>e summ-er.
During the f^eep winter season^ our
most stable DX band. 20 meters, closes
down cofnptetety in the evening around
18O0 hours and opens up whefv it is time to
leave for work in the morning. If you do not
like the very noisy low trends, there Is not
much hamming to do thesa darlc wintef
nights. It is hard for tYon*European» to
Imagine how crowded the low bands are
here at night. The broadcast and other
commercial intruders on the 40-meter
band that you may bs bothered with are
much stronger here than anywhere else!
RiCEIVER SHORTCOMINGS
In the late 60s and early 7Qn, many
hams here lost Interest In tha 40-meier
band, I think this was primarily because of
the crossHTiodulatlon problems the new
transistorized receivers were Impaired by.
One ma|or Importer of Japanese ham
equipment once told me that he could not
convince tha manufacturer how severe
this problem was here Is Europe until they
got to experience this on the spot. Tha re-
ceivers certainly have improved In thfa re-
spect, but the Intruders are stIEi pounding
their hundreds of kilowatts within the
ham-exclusive 100 kH^ of the 40-meter
band.
«0 METERS SHAPIED
The 80-meter band is shared with other
sorvices In Region 1. In the evening It is
hard to find a spot where the S-meter
drops below the S9 level. With good anten-
nas, sharp filters, and a great deal of
standi na^ £>ome avid DXers manage to
break throufh tfte noisa level and to work
distant statiofis even on eighty,
AURORA AMD TWENTY UO£RS
Wtien there is aurora, which happens
quite pftOTk, the 2-fTieter buffs are happy.
However, it also fav^HS very slKXt skip^
QSOs on 20 nwtefS- Normal ly« you caruiot
work within Scandinavia on twenty, but in
aurora conditions LA, SM. OH, and UAI
are w^orlcable. Very seldom we can reach
as far south as OZ DenmailL In aurora a
totally dead barid suddenly t>ecoiTies
aliv&
STKAMQE OPENINGS FROM LM>LAMO
I grew up in t^ptand, nortlMirn Sweden,
j[u3l rKMth of the Arctic Circle, which Is the
call area SM2L My OTH was located fur-
Ihef north than Fairtianka in Alaska,
which might be of some reference help lo
1S4 73 Magazine • April, 19S4
you- In thfl winteftEme Troni up tt\me I usu-
ally could work ihe west coast of the
No<th American continent at night. VEB,
VE7. KL7. W7, and allthe way down to W6
was land, o* couf se, still is) workal>le. The
siflnais cf09slnq itte Noilh Pole are char-
acterized tJy a very r»pid (lutiaf. In those
operiFAgs you may r>0't hear too many sta^
tiofis from liere The reason is sirnpl^e^ Ttie
popufation ia small In those arctic areas
a^ Sweden, Norway^ Ftnliand, arHJ the
ScMl«l Union.
Now summer is quiclcly approaching.
The conditions are charH}ir>g' With the
midiiioht sun artd daylight 24 hours a day,
the change is not entirely to the belter, bul
it surely is differsmi
TRINIDAD AND TOBAGO
John L Webster 9Y4JW
cfo Depanment of Soil Science
Uniyersliy of the West Indies
St. Augostine
Trinidsd
West indies
The Trinidad and Totsago Amateur
Rid to Society nTARSji. formed in 1951
artd incorporated by ar^ Act of Parliament
30 years latw m 196 1. has a membefshi|i
of 1A0, from a total population of 1^ mii-
lion persons on the two ^slarKte. There are
also atx>ut 1O0 associate m^nbers \n llie
society. Onty about fifty percent of the 140
hams are act We, some on VHF, some on
HF. and others on both.
jQhnL W6b&t&r9y4JWmP6KX,
The TTAftS has been a member ot the
lARU for about 10 years and is an aff Htatd
of the Radio Society of Great Britain
fUSClB).
The British City amli Goilds Radio Ama-
teur's Examlnatjoo tRAE) is the certifica-
tion required by the Government of Trini-
dad and Tobaoo, aJono with Morse co6e
proftciency at 13 wpm, for the issue of a
Wi Hcenae. The code test is adinmisTered
by Itie Difector ot Tetecommunications
after the successful compielion of the
RAE exam. In 1962. ttie TTA^ stef>ped up
tts training program in an effort to encouf-
age more persons to become hams, arid
weekly classes are conducted lo prepare
its associate members for both.
Unroftunateiy, the exam ^s offered only
once a year as it is an external examina-
tion. It is written in May and the results are
not known iintit the end of Ay gust of
at>out three months later! The successful
candidate then applies foe the code test.
The td62^S3 training classes were cori'
ducted at two centers, one in tt>e north of
ttie island, In the captlal dty of Port^-
Spain. and the o4her In the south, in San
Fernsncki, the industriaj centef. There Is
now a third c#nter tor the 1 983/84 classes,
in I he center of the island, at Chaguanas
At each center, classes are conducted
twice weeKly, one sesslor^ fo/ theory and
the other for CW.
The TTARS normally charge* a Sittail
fee. the main objective toeing to encouf*
a^e those who started the course to com>
plete it- Any funds raised in this way are
avatiabie to assist in acquiring equipment
and materials needed In running th«
course. Howevef , as 10&3 was World Com-
munications Year, ttve TTARS decided on
an "open-house" policy for the 1QS3^
I raiful:^ classes and thei^e is no charge for
the coufse this tinve.
Good reaults have been achieved t>y the
TTAF^ In the RAE examinations. In the
19B2/83 examinaljon, 90 percent ot the
candidates prepared by the TTARS were
successfuL In actual niimt>ers th^s means
that there are 22 potential new 9¥ hama If
they complete their code tests. One of the
successful candldMes, Mark Mass I ah, ob--
talned a double distinction in the exam
and provided a very good showing in his
code test. Mark, who has been asaigned
the callsign 9Y4M, favors CW operating
and should be providing a new country to
many of you still needing 9Y on this mode-
The TTARS does not have a clubhouse
but is allowed the use of Boy Scout Head^
quarters in Cascade, north Trinidad. Meet*
ings are held on the first Monday of each
month at 7:30 pm. The meetings aiterr^te
between north and south Trlnldadt thoae
in the south tieing helcf at Pr^ientation
College in San Femarvlo. The Annual
Ser^eral MeetJr^, a1 wh^ch new officers
are electacf, is always he^d In rvorth ThnI*
dad during the montdi of March.
In my next column I will present part I of
a two-part review of the activities Of the
TTARS during 19B3, World Communtca*
tions Year.
CALL TOLL FREE
s^
EIM\A/000
TS930S
TS430S
Now a general coverage
receiver/ham band trans-
ceiver at on affordable
price.
TW400QA
2M & 440MHz Dual-Bander
25 watts on both bands.
Call for YOUR Low Price!
R2000
Gen. Gov. Rcvr.
W/memories
TR 7950
45 Watts! Multi'featured.
TR 2500
Full Featured
2M Handheld
UPS Brown Paid on
TR 2500
2900 N.W. VtVION RD. / KANSAS CITY. MtSSOURI 641 50 / 81 6-741 -81 1 8
See Usi oi Aifvefti$^s oft page i^
73 Magazine * April, 1984 155
RAMSEY
ELECTRONICS
^ 62 \nc.
PARTS WAREHOUSE
We now have available a bunch ofgoodtes too
good to bypass Items, are hmited so order today
2575 Baird Rd,
Penfieid, NY 14526
71 6-586-3950
MINI KITS - YOU HAVE SEEN THESE BEFORE NOW
HERE ARE OLD FAVORITE AND NEW ONES TOO.
GREAT FOR THAT AFTERNOON HOBBY.
FM
MINI
MIKE
A super hig.h perlormanCe FIW WJie-
l&ss mche kiC TransfTHls a stable
Brgnal up tc 300 yard^ wFth excep-
honal 3UdFO QU^Icty by m^arkS c^) itf
buiM in electrflt mihe Kit includes
case, mike, on-ofi swiich, antenna.
baUery andsuper inslruciionj This
ra the finest urni available
FM-3Kil $14.95
FM-3 Wired and Tested 53.95
Fiyi WEr«l#» brike Kit
Tr3ri3>rnrts up to 300' lo
any FM broadcas! ra-
dio, uses any type Ot
mike. Runs on 3 lo 9V
has added sensitive mike preamp
5tag$
FM'I ktt $3.95 FM-2 klE t4.9S
Type FM-2
lirtJverEal Tinier KH
ProvitJes. I he basic parts and PG
board rectdired lo provide a source
o^ prflcisiort Mmmg and puIsS
feneration Uses 555 timer IC and
incliji;)es a rangt? ol par1$ for moai
limmg needs
UT'5 Kkt $5.95
Color Organ
See music corns
alive' 3 different
lights fftcker wtTh
music One light
each for, high,
mid-range and
kows Each indi-
\/iduaHy adjusl.-
ableand drives Up
to 300 W. runs on
110 VAC
Complete kit,
ML-t
SB.S5
VlifwMAdiJlilorKIt
Cdfivefts any TV to video monnof Siip&r
stable fufiabse ovef en 4-6 Rung on 5-
15V accepisstd vidfMi Signal Beslunii-on
Ihe markeJ' Co-miileii? Ki! VD-i J?'. 95
Led BIEnky Kit
A great attention get-
ter which alternately
flasJies 2 jumbo LED^
Use for name badges
buttons, warning
panel lights, anything'
Runs on 3 to 15 vol is
Complete tuft. BL-1
*2.95
'•^'n
* J J
Super Sleuth
A super sensitive amplf-
fier wtiich will pick up a
pin drop a< 15 feet' Great
tor monilpririg baby's
room or as general pur-
pose amplifier Full 2 W
fms output, runs on 6 to
15 volls uses B'45 otim
s,|>r^aker
Complete kit, BN-9
$5 95
CPO-t
Runs on 3-12 Vdd wall dut. 1 KHZ qood foi CPO.
Ala^m. Audio OscMPatof Complele kii t2.9S
Whkper Ugh I Kit
An miere&ling kiL smait mike
picks up sounds atid converts
them to light Ttie louder the
sound, the bfighler Ihe *ight
Includes mike, controls up lo
300 W. runs on IIO'VAC
Complete kit, WLO
Mad Blaster Kit
f'rod'jces LOUD ear ahalteimg and
attention getltng siren Itke sdund
Can suppjy up to 15- walls ot
ebr^oxirsijs audeo Runs on 6-15 VDC
MB-1 Kit $4.95
T&ne Decoder
A compleEe fone deco-
der on a single PC
boarcJ Featur4?5. 400-
5000 Hz . adjustable
range vha 20 turn pot voliagetegu-
lation S67 IC Useful for louch-
tone burst rietectton. FSK etc
Can also be used as a stable tone
encoder Runs on .!? to 12 voits
C om pS ete k H . T O ■ 1 $5^95
Siren Kit
Produces upward and downwa.rd
wail characteristic ot S police
siren, 5 Wpeak audio outpuf. runs
on 3-1 & volts. iJSes 3-45 ohm
speaker
Complete kit. SM-3 $2.95
Call ^our PtiOfie Order in Today. TERMS:
Satisfaction gaaranteed or moriey retunded,
C-O.D, add $2.50, Minimum order S6.00.
Orders undes S 10.00 add $1.50. Add 6% for
postage, insuFance. handlirig. Overseas add
i5¥L,. N.Y. residents add 7% tax.
CLOCK KITS
Your Qld lBvcrt1«s are here again. Ovtr 7,O0Q Sold Id D«t«
ee one ol the gang and ord«r your* locfayr
Try your hand al building the finest looking clock on tine
market Its satin finish anodized aluminum case looks great
anywhere, while six 4" 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 { specif y}.
Ciock kit, 12/24 hour. DC-5 $24,95
Clock with 10 min ID timer, 12/24 hour, DC-10 $29,95
For wifed^nd tested docks sdd $10 00 to kit pnce.
SPECIFY 12 OR 24 HOUR FORMAT
SATELLITE TV KIT
THE POPUU^R sat tec RECElVtR \\i KlT-F€
Irne^^ fp'^^^^ufly tunaWe audio to rKOvei
'hldd^^^^ca^^^, divide by IwO PLL CJ&rTU>r)ci^
lit Of I^Bt;elle^^^E"Hha1d p&rforrnance. tigHI
oH^k^e. rlfc'-4 cnarvnel tunable tovefage
jlllla TV system ifounea (ha P2B,
'Q~«1!!?Trhi;}uiiand qllier 9 already hi^vQ and naw
liable in kit farm Bt a new law prli;t. Ord^f
todav
tiE\N, LCmEfi PRICES!
60 Hm Tiffle Bit*
PARTS PARADE
Featured lii a RacHj^
slory iMay fl2t
TeCdJver Lg fWft
ticri^. ThF_g2t
plated 1^19^^
agsijn refill II,
Cf(ll<?fl
Itjf (he
srfi'
ff cover
jat-tat TV
c- i.'^^.jndi af loca-
build, pfft-elched,
i namparnbM la^yout
nC placBmafit ifid Etifl
aricl local oscillaiQr are pre-
'jnedl All p^rls are ir>Gliicl«d
raciive ca&A, power Bupply.
descTipiiva oparatting manoe! a$ waif as com-
plel« asaeiTiiily ingiructiciris. Feali^res ol I he re-
eeivflf include; (tuai CQmej5\«yn design for tjesl
A cflmpieto Sal9«iie TV Sy^em teamrss
B dish ani&nng, UNA [lo* r^o^se ampli-
iieri. Fiec«ivpr and Mchditlato',
H2e Receiiver Ki| IME.M
FI2BFlccewer, Wired arrtlTflfiifld (WGon
I2D*K LfIA t29S,M
RM3 HF Modu^alOf S^-*^
Prices inclLtde dafnestte LIPS ^tijpplrifl
and insurance
IC SPECIALS
LJNEAR
3C1
555
556
567
741
U5fl
«»
$35
It. SO
SI 50
$1.00
t1 00
i1.QD
HJ/*2.00
S -50
S 50
S2.95
1295
^Otl
4046
404?
4059
4511
45110
CMOS
^flP
.50
.50
SI 85
,50
$9,00
S£,0O
$1 75
TTL
74S00
7447
7475
7iOT
74196-
$ 40
t 65
S .50
t .50
$1.35
SPECIAL
11C90
10116
720 7 A
7J16D
7107C
5314
S375AB/G
7Dt)1
$15,00
3 125
$17.50
$ 5.50
$^;,oo
$12.50
$ 1.95
£ 2.95
$ 6,50
FERRITE BEADS
Wii-h \i%it> anf} 5pec5 IS^'ll W
e Hole Balui^ BBSfis S^H OO
R^Ststar Ass't
.Assijrtment ol Popular vfllues '-^
wall ■•■Cut le^ad iorPG rr^ounhnu '
center '/}" leads bag ol 300 or
St .50
Swilch'^s
Mmp toggle arDt (I.OO
Fl&d Pushbuttons N O a/il.OO
Earphor>es
Hearts -S ohrn qooa tor imall tone
5£i-eafeeT5. alafrTi ciockfi fire:
5 for $1 ,00
Crystals
.'^.579545 MHZ
10.00000 MHZ
5 ,?4Be[>a MHZ
S1.5D
$5,00
$5,00
AC Adaplers
Good 'Of c:li3CH5 nicad
charge rsjiill 110 VAC ptuq
one enri
&5.^dEi#30mA (t.OO
le M-ac ^' t.BOmA t^.&fl
Mini B atim Spfrftk^r
Afjp*c!iM 2-' diarti Rourio
[yp^i Ipr T'ShSiOs. rti«kft etc
J for *2.ClO
S<t14d Stile BuzKfi
ftrnail QuZ2et 450 H?. 66 dB soond
OuEpiit on 5-l5 w<3c at 10- 30 mA, Ttt,
<:-nm^alihl*" Jt-SO
Slug Tun«c) Coils
Small 3/te" Hej( Sfwgs lymed coi^
3 turns 10 for $1,00
AC Outlet
F*an5l ^^Duni with Lea-cJs
4/11.00
READOUTS
F*JD W7'5.<0 5-CA 1,W
MAN ^S-'«P?r3<i iS-CA 1.AD
HP 7641 ^^■■c A j.m
TRANSISTORS
swaSKie PNP c* F 1 i.f * 1 .DO
in**^^ PNP Ct r i5,<ti .00
2N441[}l4PNC*f IS/lIM
£H4?1$ F€T C'f 441-W
JW^*fli PNPC*F 5/11 W
Zt«02«C-F 1/ltM
?Nia77Ti NPN Siii-con J1 H
?N& 1 79 UH F M PN 3/12.0O
Pow«r Tib NPM *Qm Vt^M
Pdw«i' Tib Pi^^P 4DW Sn.U
UPr •iOtHiHb*^^ S.54
NP*J 390-1 T^p# T<R 5II.'«3.»
PUP 39W Typa T-fi fdlVt^.Sd
2K3N»5 t.H
3N»4« UJT 1^.00
& Pin
14 Ptn
16 Ptn
24 Pin
?e Pin
40 Pin
SoekeH
10/$2.00
10/(2,00
fo/$2,oa
4/12.00
4/S20O
3/S2.0O
DliOdea
5 1 V Zenpf 20/*1 DO
1M9t4Type S0/J1.00
1KV ?Arnp S/JI.OO
100V lAmp 15/SrOO
L
25 AMP
100V Bridge
$1.5D each
Mini-Bridge 50V
1 AMP
2 for $1.00
CAPACITORS
TANTALUM
1.5uF25V3y$1,00
1.euF25V3/$1.00
.22uF2.W3/Sl 00
ALUMINUM
E^e^SlrOlvlit
10Q0 uF lev ftifli^i I.W
SOT i>r ?(1V A ma I t.50
1$n ifF r&V Aa^^I 5/-f 1 Hi
10 LiF I^V RaHial tC'tl M
{}ISK CfRAHIC
i>t t6v oi$h ao'ti oo
I iGV 1S;-n M
■jOi <6v 30/t1.04
i(»pF m>-ii.oo
047 16V Jq.'lH.JW
DC -DC Conwert^r
^5 vdc input fftoa -9 vdc jp 30rria
"■ivfjc prr>jii.C:e$-15w(lC(a::i3Sma $l.iS
?SK 30 Turn Tnrr> Po\ 11,00
tK 20 Turn Trim Pol J .50-
CeramLC IF FiHi^'T--
IE
Trlmmtr Capi
Sprftgue - 3-40 pf
Stable PolypropvJ^^rte
Crymtal Mlcroptione
Small 1" diameler %" thick
crystal mihi& Carlr*dg& f.7S
CoeK Connector
Chassis mouoi
BNC type $1.00
Mini RG- 174 Coax
to ft, rorsroo
9 VO'ti ButltFy Cllpt
NiM Ejua I M V c 1 1 ps 5 tof S 1 .00
V flubbflT Gfomrne!5 10 Iw JI.OO
PirTi B*e
A^il 0* CF^Ohfri ■Ji»< C*OS i*i^« rftJiSlOr?
uit'^siitofSi ^^iddfrj MICA cao* tiiHT
sm tii.^ aOO PCI il.DO lg bag 1300 p<c) tl,H
Connvctq-rm
6 pun lypd [)otdconiAci^ ri^r
mA-l003 CAt clock module
ppice .fi B*.
Ledt - your choice please ^pecity
Mini Red, Jumbo Pi&d. High Intensity Red. IHuminator Red 8/t1
M^ni. Yellow, Jun>bo Yellow Jumbo Green 6/$-l
Mororolfl MV 2S09 30 PF Momin&> cap ^iQ-^ PF
.^0 «»ch or 3;t1.KI
Tijna&ie rsTige
Audio
Pre^caler
Make hi;jh resolution audio
measurments. great for m^.istcal
instrument tuning. PL tones, etc
Mijliiplies audio UP in frequency.
isSlGCtable xtOor xlOO, gives 01
^Z fesolufibn with i sec gate
lirne' High sensitrvdyof 25 mv 1
meg input i and huilt-m filteiring
gives great porformance Puns
on 9V battery alJ CMOS
PS-3 kit $39.95
PS-2 wired $49.95
600 MHz
PRESCALER^--*
Extend the range of your
counter to 600 f^AHi. Works
with all counters Less than
150 mv sensitivity specify -
10 or -100
Wired tested. PS-1B $59.95
Kit PS- IB $44.95
30 Watt 2 mtr PWR AMP
Simple Class C power amp features 6 times power gain 1 Win
tor 8 oul 2 W in for 15 out, 4W in for 30out Max outpurof 35 W,
incredible value, complete with all parts, less case and T-R relay
PA-1 . 30 W pwr amp kit $ 2A.9B
TR-1, RF sensed T-R relay kit 6.95
MRF'?3@ transistor as used in PA-1
a-IOdb^aifi 150 mhz Si US
RF actuated relay senses RF
{1W) and closes DPDT relay
For RF sensed T-R retay
TR-1 Kit $6.9S
P>ower Supply Kh
Complete Inple rfegu-lal&d pcwer
Supply provides V3riflble Sto 1&vo3t&at
200 ma and *5 at i Amp Excillent load
regulation, good hlleririg and smaM
siie. Le5? Iran stqrmera. requires 6.3 V
,>P 1 A and 24 VCT
Complete Jiit PS'3LT $6-95
Ail
OP'AMP Spvdal
BI-FETLF 13741 -Direct pin lor pin 741 c^ Q\i,;,tjut 500.000 MEG
inpy3 z. super low 50 pa input cur'ijkW power dram
50 for onjy $i.OD ^^ 10 for $2,00
TSWtG
79MG
7&05
11.25
S1.Z&
«,so
$1 15
11,00
Rt^ulilon
7812
11.00
78 IS
$1.00
79Q5
$1.2S
7S12
$1.25
7915
$1,2&
Shrlnh Tubing Nubi
Mice prec^i ptes ot^rirrnk sue- r h. -'m"
St^rmk to 'i" Gr^al fot splrces SOAll.M
Mint TO-32 Heal Sinks
Thecrndllciv Brand Stof$1.M
Opto Isolators - 4N28 type
Opto Reflectors - Photo diode * LED
^
$.50 ea.
$1.00 ea.
Uoin Pint
MqIsj already pracul m length of 7 P^acl
for 14 p<n soe^tBti 2Q alrtp* lor tl.OO
CDS Pholocttlla
^CJi^lant^fi vliriA$ with Ij-ghl $$0 ohms Cv-
156 73 Magazine • April, 1984
John J Meshna Jr., Inc.
\22
19 Alkrton Street • Lynn, MA 01904 • Tel: (617) 595-2275
SELF STANDING COMPUTER TERMINALS
We acquired a small number of these beautifully made computer
terminals which were made by a major U. S. manufacturer. We
do not know all the details about them at press time, but we can
tell you that someone lost over $2000 on each of them. They lose
you win. The terminals feature 3 micro-processors for powerful
capabilities, 106 key, Hall Effect ASCII keyboard, 10 user define-
able keys, EAROMs, 16K RAM, 48K ROM, serial RS 232 asyn-
chronous data communications, (synchronous optional), select-
able baud rates of 75-38.4K BPS, high resolution, 12" green
screen, composite video monitor, 80 X 25 line scrolling display,
built-in reverse video option, self-contained, lightweight, tightly
regulated switching power supply & more than can be fit in this
space. The terminals were designed to be daisy chained around a
central host computer and used as individual work stations. The
host system could then selectively address any machine in the net-
work for any message it may have. All units are visually inspected
prior to shipment. An operators manual is provided w/ each unit,
Shpg. wt, 55 lb, model no. MT 686 $289.00
With the addition of our TP 420 dual FDD system below, you can
create your own office system*
We offer the following as options; schematic pac. 3 lb. $ 10.00
USRT for synchronous data comm, w/ installation data $ 10.00
25' RS 232 cable, 1 male & 1 female DB 25 connector $ 20.00
TP 420 DUAL MINI-FLOPPY DISC SYSTEM
The TP 420 is an extremely versatile mini floppy disc drive sys-
tem. It consists of 2 Shugart SA 400 5^4'* floppy disc drives, as-
sociated logic, controller card, power supply, cooling fan, and
case. The TP 420 has a built in controller card which features:
Z 80 A CPU, Z 80A DMA, Z 80A CTC, Intel 8271 controller
chip, 6K RAM, ROM, plus other goodies. We have been told
that the serial interface controller card within the TP 420 will
support up to 4 8" drives from the unused port on it The con
tr oiler card can be easily removed should you wish to use it on
some other system. Also built in is a tightly regulated, switch"
ing power supply which runs on 115/230 v 50/60 hz.. The TP
420 is shipped w/ the interface cable for the MT 686, data, &
schematics. Shpg. wt 22 lb. Stock no. TP 420 $300.00
PDR-27 NAVY RADtATlON METER
Just released by the US Navy, They appear to be ir excellent condition and include the
fitted aluminum transit case. Battefies not fUmished but are available in most electronic
supply houses. 4 ranges 0.5 to 500 mr/hr. Ramoveefel© hand probe, detection of Beta
and Gamma radiation. With todays world conditions and perhaps proximity to a nuk«
power station, it might provide a Httte insurance to own one of these instruments. With no
facilities to check or test, wa offer AS IS, visually OK Schematic provided with each. We
have some accessories and offer as an optkKi although not required for operation.
Shipping wgt, 22 lb. PDR-27 Rad Meter $50.00
PDft-27 phones $7.00 Approx, 1 00 page Instr, Book $1 0.00
Hi Sensitivity GM tube $1 0,00 Low Sensitivity GM tube $5.00
The above fisted tubes are already instafied in ttm meter
We are offering these as spares if desired.
PHONE ORDERS accepted on MC, VISA, orAMEX
No COD^s. Shpg, extra on above.
Send for free 72 page catalogue jam packed w/ bargains.
^See List of Ad\/ert!sers on page 130
73 Magazine • Aprtl, 1984 157
THE MOST AFFORDABLE
REPEATER
ALSO HAS THE MOST IMPRESSIVE
PERFORMANCE FEATURES
(AND GIVES THEM TO YOU AS STANDARD £QUIPMENT!j
JUST LOOK AT THESE PRICES!
Band
Kit
10M,6M|2IVI,220
440
$680
$7@0
Wired/Tested
$860
$980
BGtti kfi snd wir^ units am pompfstB with aif psrts, modules, hafdwsfB, ami crysfa/s.
CALL OR WRITE FOR COM
DETAILS.
Aiso svatiAbie tor mmom sit& Unktrtg, crossb^nd, Bftd remote b&se^
FEATURES:
• SENSITIVITY SECOND TO NONE; TYPICALLY
0.15 uV ON VHF, 0.3 uV ON UHF.
• SELECTIVITY THAT CANT BE BEAT! BOTH
8 POLE CRYSTAL FILTER & CERAMIC FILTER FOR
GREATER THAN 100 dB AT ± 12KH2. HELICAL
RESONATOR FRONT ENDS. SEE R144, 8220,
AND R451 SPECS IN RECEIVER AD BELOW.
• OTHER GREAT RECEIVER FEATURES: FLUTTER-
PROOF SQUELCH. AFC TO COMPENSATE FOR
OFF-FREQ TRANSMITTERS. SEPARATE LOCAL
SPEAKER AMPLIFIER a CONTROL.
• CLEAN. EASY TU ME TRANSMITTER; UP TO 20 WATTS OUT
(UP TO SOW WITH OPTIONAL PA),
HIGH QUALITY MODULES FOR
REPEATERS, LINKS, TELEMETRY, ETC.
HIGH-PERFORMANCE
RECEIVER MODULES
R1 44/R220 FM RCVRSfor 2M or 220 MHz,
0. 1 5uV sers.: 8 pole xtal filter ^ ceramic filter
in H, helcat resonalor front end fof exoetDlional
selectivity, more than -100 dB at ±12 kHz,
best available today- Flutter-proof siiuelch.
AFC tracks drifting xmlrs. Xtal oven avail.
Kit only SI 38
R451 FM RCVR Same but for uhi. Tuned line
front end. 0.3 uV sens. KJt only $1 38,
R76 FM RCVR for 10M, 6M, 2M. 220, or
commercial bands. As above, but w/o AFC or
hel, res. Kits only $li a.
Also avail w/4 pole filter, only S98/kit.
R1 lOVHF AM RECEIVER kitforVHFaifCf*-ft
band or ham bands. Only $98.
R1 10-259 SPACE SHUTTLE RECEIVER,
kit only $98.
amironics
tsa 73 Magazine • ApriM9&4
^33
TRANSMITTERS
TS1 VHF FM EXCITER for TOM, 6M. 2M.
220 MHzor adjacent bands. 2 Watts contin-
uous, up to 2Vz W intermittent, $68/kiL
T45t UHFFM EXCITER 2 to 3 Watts on 450
ham band or adjacent freq. Kit only S78.
VHF&UHF LINEAR AMPLIFIERS. Use on
either FM or SSB. Power levels from 1 0 to 45
Watts to go w/lth exciters & xmtg converters.
Several models. Kits from $7S.
A1 6 RFTIGHT BOX Deep dravt/n alum. case
with tigi^t cove rand no seams. 7x8x2 inches.
Designed especially for repeaters. $20.
ACCESSORIES
• COR KITS With Audio mixer, speaker ampli-
fjer, tail & time out timers. Kit only $3S.
• CWID KITS 158 bils, field programmable,
cfean audio, rugged TTL logic. Kit only S68.
• OTMF DECODEft/CONTROLLER KITS.
Control 2 separate on/off functions with
touchtones*, e.g., repeater and autopatch.
Use wittt main or aux. receiver or with Auio-
patch. Only S90
• AUTO PATCH KITS. Provide repeater auto-
patch, reverse patch, phone line remote
control of repeater, secondary control via
repeater receiver. Many other features.
Only S90. Requires DTMF Module.
AS^^l
%
HELICAL RESONATOR FILTERS available
separately on pcb w/connectors.
H RF- 1 44 for 1 43- 1 50 MH z S38
HRF-220 for 213-233 MHz $38
HRF-432 for 420-450 MHz S48
NEW LOW-NOISE PREAMPS RECEIVING CONVERTERS TRANSMIT CONVERTERS
New low-noise microwave transistors make
preampa in the 0.9 to 1.0 dB noise figure
range possible without the fragility and power
supply problems of gas-fet's. Units furnished
wired and tuned to ham band. Can be easily
retuned to nearby freq.
Models LNA{ I
P30. and P432
shown
Model
LNA 28
LNASO
LNA 144
LNA 220
LNA 432
LNA SOD
Tunable
Freq Range
2040
40-ro
120-ieo
190-250
360-470
470-960
Noise Figure
0.9 dB
0.9 dB
1.0 dB
1.0 dB
1.0 cfB
1 2dB
Gain
20 dB
20d8
lSd6
17dB
16dB
15dB
Price
$39
S39
$39
$39
$45
$45
ECONOMY PREAMPS
Our traditionat preamps, proven in years of
service. Over 20,000 in use throughout the
world- Tuneable over narrow range. Specify
exact freq. band needed. Gain 1 6*20 dB. NF =
2 dB or less. \/HF units available 27 to 300 MHz.
UHF units avaflabie 300 to 650 MHz.
P30K, VHF Kit less cas©
P30W, VHF Wired/Tested
P432K UHF Kit less case
P432W, UHF Wired/Tested
$10
$33
$21
$36
P432 aiso available in broadband version to
cover 20-650 MHz without tuning. Same price
as P432; add ^'S" to model #.
HELICAL RESONATOR
PREAMPS
Ff.
Our lab has deveioped a new line of iow-noise
receiver preamps with helical resonator filters
burit in. The combination of a low noise amplifier
similartothe LNA series and the sharp seiecttvity
of a 3 or 4 section helicai resonator provides
increased sensitivity while reducing intermod
and cross-band interference in critical appli-
cations. See selectivity curves at right. Noise
figure = 1 to 1 .2 dB. Gain = 1 2 to 1 5 dB.
Model
Tuning Range
143-150 MHz
Price
HRA-144
$49
HRA-220
213-233 MHz
$49
HRA-432
420-450 MHz
$59
HRA-{ )
150-174tVlHz
$69
HRA-( )
450-470 MHz
$79
Models to cover every practical rf & If range to
fisten to SSB, FM. ATV. eta NF = 2 dB or less.
VHF MODELS
Kit with Case $49
Less Case $39
Wired $69
Antenna
Input Range
28-32
50-52
50-54
144- 14a
145-147
T 44' 144.4
146-148
f 44- 146
220-222
220-224
222-226
220-224
222-224
Receiver
putput
144-148
28-80
144-148
28-30
28-30
27-27.4
28-30
50-54
28-30
144-148
144-148
50-54
26-30
UHF MODELS
Kit with Case $59
Less Case $49
Wired S75
432-434
435-437
432-438
432-436
439,25
28-30
26-30
144-148
50-64
61.25
SCANNER CONVERTERS Copy 72-76. 135-
144, 240-270, 400-420, or 806-394 MHz bands
on any scanner. Wired/tested Only $83.
SAVE A BUNDLE ON
VHF FM TRANSCEIVERS!
FM-5 PC Board Kit - ONLY $1 78
complete with controls, heatsink, etc*
10 Watts, 5 Channels, for 2M or 220 MHz.
Cabinet Kit complete
with speaker, knobs,
connectors, hardware.
Only $60.
While supply
lasts, get $60
cabinet kit free when
you buy an FM-5 Transceiver kit
Where e Ise can you get a complete transceiver
for oniy $178
For SSB, CW, ATV, FM. etc. Why pay big
bucks for a multi mode rig for each band? Can
be linkedwith receive converters f or transceive,
2 Watts output vhf, 1 Watt uhf.
For VHF,
Model XV2
Kit $79
Wired $149
(Specify band)
Exciter
Input Range
28-30
28-29
26-30
27-27,4
28-30
50-54
144-146
50-54
144-146
Antenna
Output
144-146
145-146
50-52
144-144.4
220-222*
220-224
50-52
144-148
28-30
i
For UHF,
Modei XV4
Kit S99
Wired $169
28-30
26-30
50-54
61.25
144-148
432-434
435-437
432-436
439.25
432-436*
*Add £20 for 2M Input
VHF & UHF LINEAR AMPLIFIERS. Use with
above. Power levels from 10 to 46 Watts.
Several models, kits from $78.
LOOK AT THESE
ATTRACTIVE CURVES!
[
i
lj_
1
I
I
—
r
Y
/
\
J
{
^B Irr
1
\
i
J
<-_ «4rt
1
\
I
\
J
\ .
J
i
\1
-^
Sfl
/
i i
-
—
c
16
\*i
l4i
h 3
i(y
A
0-B
-<S'
' i 1 1 ' r
^,itl Him +(e '%-fl*
T^fC&t S&feGtwty Curvos
of fi&c&ivefs and
HBiic&i Resonators.
IMPORTANT REASONS WHY
YOU SHOULD BUY FROM THE
VALUE LEADER:
1. Largest seiectlon of vhf and uhf kits
in the world.
2. Exceptional quafity and low prices due
to targe voIum&.
3. Fast deUverf most kits shipped same da y.
4. Complete, professional instruction
manuals.
5. Prompt factory service available and
free phone consuttation,
6. in business 21 years.
7. Self more repeater moduteB than ait
other mfrs. and have for years^ Can give
quality features for much lower cost
amironics, inc.
Call or Write for FREE CATALOG
(Send $1 .00 or 4 IRC'c for overseas mailing) l - - ,
Order by phone or mail • Add $3 S & H per order^sa
(Electronic answering service evenings A weekends) 65-A MOUL RD. • HILTON NY 14468
Use VISA, MASTERCARD, Check, or UPS COD. Phone: 716-392-9430
Hamtronics ^ is a registered trademark
See List of Advertisers on page 130
73 Magazine • April, 1984 159
■The
HMf SHACK
808 N. Main
Evansville, IN 47711 l^
812-422-0231
812-422'0252
Prices ^f}<f Avatf^bitity Subieci lo Qh^rtQ^
I hh^
TEN TEC 2591
SANTEC ST 142
AEA
CP. 1/C.64 or VlC-20 Eoftwafe Package
MP-?0 or MP** Irle^fat-e Package , , ,
AMT-1 AmlOf^RTTV^CW
ALLIANCE
HD73 (10.7 sq. ft.] Rolator
U110 Small Elevation RoTator . . . . .
AMERITRON
AL^aOQSKAmp . . . , . . .
ASTHON
RS7A S-7 Amp P^iwer Supply
•RSlOA 7.5-10 Amp P&w^f Supply, .
RSiaA 9- 12 Amp Render Supply ...
RS2QA 16-20 Amp Power Supply , .
RS20M 16-20 Amp w^mater . . ,
RS35A 25-35 Amp ,
RS35M 25-3.& Amp ^v^metar
HS50A 37.50 Amp.
RS50M 37-50 Amp w^ meter, . , . .
AZDEM
PCS^OOO 2M moblfe rig
BENCH Eft
BY-1 PaddlafB¥-2 Ctiroma
,,. .CaiJ
. .$129.00
. . .449.00
.. tst.oo
. . .49.00
S59900
. . $43.00
. . .59.00
. . 69.00
. 89.00
109,00
. 135.00
. ^ . . 149.00
.199.00
525.00
, S2S0 00
.S39. 00^49. 00
^ '§ i i i t « ■ ^^
'^^■^^^^
YAESU FT 757GX
75
BUTTERNUT
HF6VeO-10 Meier V«rl(cai
COIN NECT SYSTEMS
Pfiwale Patch II
CUSHCHAFT
A3 Tribsnder 3EL. ■
A4 Tiibarrtfet 4EL
5JflB^2l4FB Boome-rs UEL ?^^
32^ 19 Super Boomer t9EL 2M
DAIWA
CN.520 1.a.60 MHa SWR/Pwr MlP
CN-e20B l.a-150 MHz SWFb'Pwr }AU
CN$^0 140-45D MHf SWRiipWT Mir
CN720e 1.fi-1&0MHzSWR/PwrMtf
ENCDMM (SANTEC)
ST^42. 222. 442, AI»o Slochtng KDK FM'2033
T1i« Hpndheti^^ SI til OfNrinf^inq Mp»r Fqalur^Q:
CaLI fox Your DCacoLint Prlca
HAL
Cfii 30O Compuiej' interface
CR( 100 Comptiler irtter-tace.
MY GAIN
TH7 DXS 7EL Tr I bander
TH5MK2S5ELTribander. . .■
ExplDFec 14 Tribander
C045 a.5 9<i. 11 ftot&lor
Ham tV 15 §fl. It. Rotator.
TSX 20 sq M Hotalor. . . . ,
f r** ShlppJ^o on 6l| Cftnk-up Towert
ICOM
1C0EAT Now Available
27ANewUttra-SmaliaM ., ...
271 hf tOOW All Mode
471 A Deluxe flaseXcvr
7S1 Ultimate TrsnsceiveT ......
,1119.00
. S42S.00
.*2 15.00
. 2?t.OO
.00 each
. . 59.00
^3.00
110 00
129.00
1 SD.OD
?25.D0
i37S.OO
. .319.00
?79.oa
. 129.00
. .199.00
^ 249.00
Call
Call
Call
Can
-Call
€
*^;
n
e '
#^*^^SB[
^^s^^^^^^^^^^^^^^H
ifoi^^fl
^^^^^^^^^^^^1
|HH|HKH
^^^^B
■S^S
^%mu
j^F^^^^lj^
wK^^B
ICOM IC 27A
25H Wllh Free Memofy Baakup
745 Amazmg Transceiver. .
IC-2AT ...
3ATMAT Har^dhelflSi
45A4flCiMHE
R71 A New h Improved Receiver
KLM
Oaca^ An leu n as In Stock. Call loi Prices..
KANT RON ICS
The In1«rfaci< I). Tha brand oaw c^mputeir
CW. HTTY, ASCII. Software Available
APPLE, ATARI, THWC.TIflfl
Amtor SDllHrera Now Ava^labla
KEN PRO
KR-500 Etevation RolatOr
LARSEN
NLA-iSO-MMS/a Wave 2M Mag Ml.
MFJ
1229 M^w Computer InlerFac^ m/AM-tqr
1224 Now Compuler Interface . .
313 VHF Conv Tor HT
Very LArQ«£lQckiaf MFJ Products. Call lor
Ml RACE
D24N 440 MHi Amp
DIOION 440 MHi Amp
B1016 10-1S0 Amp^Preamp
B30i« 3i0-iS0 Amp^Pfeamp...
SHU RE
444D Desk Mic
TEN TEC
The Fantastic Corsair. .
^5TD Oscar Transverler. . . ,
2591 2M Handheld
TOKYO HY POWER
HL 160V 3 Qf 10/160 W Preamp .
HL 160V 25^160W Praamp
HL90U 1O.f&0W yHF Amp^preamp,. ,., = = .
HLa2V 1D/30W Preamp -.,.-.,-
HL45U WA^m UKF Amp/Pre amp. . . .
YAESU
FT'990 CompUler Aided XCvf Syfilam . . . .
FT-7S7CX Syper Buy - .^,-- ^:,-. .: . . .
FT-20aR 2M Handheld. .
FT-726R Trthand Xci^r . . ....
FT-a03fl New NT . . . . ,
. , . Call
. . Call
1215.00
236.00
.3:35.00
Call
.J179.00
ra&.oo
, , Call
Call
jse.oo
DIacounI Prbln)^.
.$179.00
. 279.00
. 245.0D
,.199.00
. , $55.00
.51020.00
, . 425.00
AvaiiatJia
. .$295.00
269.00
. . 305.00
. . 139.00
, , 175.00
. $1 259.00
. . 740.00
265.00
Call
Call
USED EQUIPMENT
This list was compiled 2/S/84. Our used
equipment changes dalty. Please write or
call for our current listing.
AEA
MBA-HO Reader
A2&EN
PCS-3<«)0 2MTFl. .
PCS^4000 2MTR
PCS-3W H.T,
DENTRON
Ciippeiton L Amp
W3 Wellmlf
DRAKE
TR7fPS7, ran
R?A Rcvf
TR4, RV4, AC4
TR4, AC4
TFO, HVe, AC4el£:..6 MTR
T4X. R4A. P.S.. MS4
ENCOMM
HT12W 2MTR H.T
ST7T440fJlHrH.T.. . . .
HAL
ST6D00 Demodulalor w^S^^ope.
CT2200^KB21O0
HEATH KIT
SA206CI 2Kw Turer. . .
SA2040 3K* Tiirer, . .
Se 102, P.S., CW
SB 1D4A. GW, PS,, Sphr.
SB 634 Consolfl. . j. .
SB 101, CW, P.S
HW 101, CW, P.S
SB 630 Console
HW2035 2MTfl
OX 60B Xcvr.
HG lOB Vfo.
PS 9000 P.S. Spkr, ClOCha.
HP 1144 20A P.S
HWa ORP Xcvr
I COM
740 Xcvr
740^Keyer
740fP.$
HM'2RBmole
2SA3MTRfled
245 2MTR
22S2NflTH
2AT 2MTR H,T
SM-5 [>esbi Mie . . . .
SM-2Daal[Mlc
HMeT.T. Mid
440 MHj Preamp
KANTRONICS
lotarface
*199 00
S2 15.00
229.00
.5^)9.00
545^.00
. . .49.00
.W99.D0
1025.00
349.00
.279.00
. . 469.00
..339.00
$149.00
. 169.00
.1469.00
745 00
$1.B9.00
. 139.00
.32S.00
.399.00
.100.00
. .525-00
.269.00
.69.00
. .109.00
. .25.00
, . .49.00
.175.00
, , . !i9.00
, . . S6.00
. $6fi9.00
699.00
769,00
. . .69.00
,,.225.00
.149.00
. .125.00
, .175.00
...29.00
...29.00
, . .40.00
i . . 5S.0O
. $79.00
Field day Rtadei
Oi>ai Filler.
KENWOOD
TS B30S, CW
TS a.50S Xc«
TS 12QS/P.S
T5990/R599D
9130 2MTH AliM&de, T.t Mic,
?e2S 2MTR
RM 76 Remote
BC£ DC Chgr . . , .
RSOORcvr
820Vfo..
7200 2MTR/P.S,5
YG 455 C 5D0HZ (B30)
YK fteC 500 Hjz (S30)
CW Filter j520f
PC-1 Phone Patcft. ...... ,
MFi
495 Super Keyboard^RTTY . .
1??J Intersect , , .
721 SSB^CW Filler
CWF.2 Filler
24 Hour Ciock
I2t0 interlace
SWAN
Aairo 150 xcvr
WM20O0 MTR
TEN-TEC
560 Corsatr
263 Vfo
OMNI-C
OMNI Dm
544 Xcvr
525 Argosy
509 Argcftaut
252MO P.S
25iM P.S.. . . .
234 Speecti Proc ,
276 Xca.[ , ,
20SCWFiilaf
1A P.S
YAESU
FT901 DM
FTIOIEE.CW ..
FT30tDFP30tD
FT225RD 2MTH All Mode .
99 00
.,.&9.00
J6fl9.00
. 529.00
.4*5.00
. 450.00
. 365.00
180.00
. . 50.00
. .25.00
149.00
. 125.00
115.00
65.00
.35.00
. 25.00
.29.00
,St99.DQ
. . .7000
.4000
.26-00
. . 20.00
.59.00
.$399-00
. 49.00
.$799.00
. .135.00
625.00
. . 449.00
. . 375.QO
.376.00
. .225.00
. . .99.00
.99.00
. .69.00
...19.00
. .19.00
. . .19.00
$625 00
. . 425.00
. 525.00
470.00
FT221 2MTR AM Mode 269.00
YC22I Dig. Read .... ... 69.00
YD14B Desk M<c 29,00
FRG 77D0^Mem(jrv .... .. ..39«.00
FRO 7000 ftCvr 299.00
FT257R 2MTR 149.00
FT237HA 2MTfl 169.00
FT202R H.T 110.00
FLttOAmp 125.00
FTtOSR 440MHz HI .. . 219.00
MISC'
DiawaCNA 1001 Auloluner ... . 5239.00
Robot 400. , 250.00
Panasonhc Camera. S 7 5,00
Z&om Leng, .09.00
N^ta1^!;ni FP3030 CoJOr Camera w^Zoom Lerss &
Color Monitor . . .Caili
GalaKjf V MK2, P.S... 199.00
Galaxy V Vfu. . . 69-00
Galaxy V MK2, P-S,, Low Outpul , . , ... .1 15.0Q
&X3D2 Rcvr , .. 239.00
DX200 Rcvr 125.00
RTTV Monitor 49.00
Wilson 1^05 H.T ..100.00
Wilson 1402 H.T. . . . .>.,.,,, 100.00
DEMONSTRATORS
CP't Interlace. . . $169.00
AMT-1 Interface .. .425.00
DRAKE
12" Gieen S^:reen $126.00
ENCOMM
t44Lp H.T $239.00
STTT 440 MHz H.T ,, -(99 00
ICOM
75t DflLuxe Xcvf ., ... $1139.00
745 X.Cvr .629.00
RTOficvr. . . .&25..00
7072 inrerface 95.00
720A Xcvr . S2S.00
29CIH 2MTR Air ^rfOde 425.00
25M/Mem BK up 295 00
MFJ
313 H.T, CQr>verter %Z2m
825/830 MTR aS.OC
CLOSE-OUT SPECIALS
AEA
KT-1 Keyer/Traitier, , , . .. .$69.00
MK-1 Ke^r 49 QO
DRAKE
Tiieta 7000E Terminal , $569.00
ICOM
740/P.S. f S50 Rebate $Sl9.m
251 A ^^ $50 Re&ate 525.00
402 432MHz Xcw 249.00
Send SASE for our new & used equipment
MON-FRI 9AM>6PM * SAT dAM-SPM
list
ICOM, WILSON, KENWOOD
and MAXOM Commercial
Equipment Available
30 DAY WARRANTY ON USED EQUIPMENT
THE FIRST NAME
ELECTRONIC TEST GEAR
NEW FROM RAMSEY-20 MHz
DUAL TRACE OSCILLOSCOPE
Unsurpassed quatity at an unbeatable price, the Ramsey oscilloscope
compares to others costing hundreds more. Features include a compo-
nent testing crrcuit thatwiil allow you to easily test resistors, capacitors,
digitai circuits and diodes • TV video sync filter * wide bandwidth &
high sensitivity • internal graticule • highquaifty rectangular CRT
• front panel trace rotator • Z axis • high sensitivity x-y mode • u^ery
low power consumption • regulated power supply • built-in calibrator
• rock solid triggermg • high quaHly hook-on probes
$39995
high quadly
hook-on probes included
RAMSEY D- If DO
VOM-I
Compact and re I lab te. de-
signed to service a wide vari-
ety ai equipment. Features in-
clude • mtrrof back scale
• double- jeweled precision
rnoving coil » doubfe over-
load protection * an ideal Jow
cost unit for the beginner or
as a spare back- jp unit.
$1995
test leads and battery
irtctud«d
RAMSEY D-2t00
DIGITAL MULTITESTER
A compact easy to use unit
designed to oper&te like a pro.
Featuring * 3'/^ digit LCD * low
BAT fndicaior • ail range over-
load' protection * overrange indi
cation ■ auto-pol^nly • Transis-
lor tester • duai-slope integra-
tion * vinyi carrying case
Kp£ lei^t leads, battery & vinyl
carrying case mcludied
RAMSEY 0-3100
DIGITAL MULTIMETER
Reliable, accurate digital
measurements at an arnaz-
Ingiy low cost • fn-Jine color
coded push buttons, speeds
range selection • abs plastic
tilt stand » recessed input
iacks • overload protection
on all ranges • SV? digit LCD
display with auto zero, auto
polarity & low BAT. indicator
test leads and battery
included
CT-70 7 DIGIT
525 MHz COUNTER
L^b quatity at -a breakthrough price.
Features • 3 trequency ranges each
with pre amp • dii^i selectable gate
time5 ■ gate activity indicator
• 50rT5V (<.C- 150 MH^ typical sensitivity
• wide frequency range • 1 ppm
accuracy
$ii995
wired in etudes AC adapter
CT-70 kit 599.95
SP-4 nicad pack 0.0S
CT-90 9 DIGIT
600 MHz COUNTER
The most versatile tor less than S300.
Features 3 seteciabEegatetimes • 9
digils • gat^ indicator • display hoJd
• 25mV(a'i 150 MH^ typical sensitivity
• lOMHztimebaseforWWVcalibra-
Ipon • t ppm accuracy
$i4995
wired inc lucres AC adapter
CT-^0 kit $129.95
OV-1 0.1 PPM oven timebase . . .59,55
BP-^ nicad pack 8.95
CT-125 9 DIGIT
1.2 GHz COUNTER
A 9 digit counter that will outperform
units costing hundreds rnore. • gate
indicator • 24mV@ 150 MHz typical
sensitivity * 9 digit display • 1 ppm
accuracy ■ display iiold • dual Inputs
witiipreamps
*16995
wir«d inclucfes AC adapter
6P-4 nicad pack B-35
iinva ttsiiinH^
CT-50 8 DIGIT
600 MHz COUNTER
A versatile lab bench counter with
optional receive frequency adapter,
which turns the CT-50 into a digital
readout for most any receiver * 25 rnV
(ffl 150 MH2 typical sensiti^vity • B digit
display • 1 ppm accuracy
$169^5
CT-50 kil $130J5
RA-t receiver adapter kit 14.96
^=: \\)f/t=i~
I B PWiit ahHII»4R
DM-700 DIGITAL
MULTIMETER
Professional quality at a hobbyist
prace, Features include 26 different
ranges ancf 5 functions • 3'.v dig-it, Vz
in:ch LEO display • automatic decimal
placemenT • autornaticpoiarity
$ii995
wired includes AC adapter
DM-70Q kit $99,95
MP-1 probe sel 4.95
PS-2 AUDIO
MULTIPLIER
Thie PS-2 is hancfy for high resoiiitiion
audio resoluhon measuremenls, rnyl-
tiplies UP.in frequency • great for PL
tone measuremenis • multipljesby 1d
Of 100 • O.qiHs resolution i buiEt-in
signal preamp/condinoner
PR-2 COUNTER
PREAMP
The PR -2 is ideal for measuring weak
signiaEsfrom 10 to 1,000 MHz • flal 25
db gam • BNC connector s • great for
snjfling RF * ideal receiver/TV
preamp
PS- IB 600MHz
PRESCALER
Extends the range of your present
Counter to 600 MHz • 2 stage preamp
* divfdeby 10 circuitry * sensitivity:
25mVp 150 MH? • BNC connectors
• drives any cotinjer
$4995
$4495
PS-2 kJl ..................... $39.95
wired includes AC adapter
PR-2kit ., -..,,, $34.95
Wired includes AC adapfer
PS"lBkht $49.95
ACCESSORIES FOR RAMSEY COUNTERS
Telescopic whip antenna — BMC plug .. $ 8.95
High impedance probe, light Joading . . . 16.95
Low pass probe, audio use 1635
Direct probe, general purpose use 13.95
TiU bail, for CT-70, 90. 125 3,95
master charge]
^^m5^^
iH ■! Fm«ni ~^ ind
PHONE ORDERS CALL
716-586-3950
lELEX 466735 RAPVISEY CI
TERMS: • saEisfacEftrt guarameed • eurttiJiefar 10 days; if fiflt pleased, reiurn in.
ijrigmal iDrm for relund • add 6".! iDf sttipping and irsuraJice to a maxunum of
Slum • nvers^Bs add 15% Ic^r surhce mail • COO add UbQ jCuD \n USA mm
* orders under Srs.DO add Si 5Q * NY residenisadd 7--. sales ta)( • SOtiavparls
warrafilv ofi all kits • t year parls & iabpr warFarlv or aJI wir&d i/nits
^ = = =— ^== RAMSEY ELECTRONICS, INC,
i#Silli!€i€¥ 2575BairdRd.
1 Penfield.N.V. 14626
*^Sfi6 List of Adverthers on page^ 130
73 Magazine • ApriU984 161
DEALER DIRECTORY
Culver Cify CA
Jun^s Ektrtjonks, 39I& Sepulvieda Blvd., CuJvtt
City CA 90230. aOiKft003. Tj^^es 463-1886 San
Diegp. &27 5733 (Reiw NV).
Ffmtana CA
Complert lifws ICOM, DcriTron, Ten-Toe,
Mirage, Cublc^ Lunar, over 4000 dectritmic
priodticts for hpbb>rist. tfichniciftn^ etperi-
menter. Aha CD rsdio^ londmobiie- Fcmtaiu
E1cictTrmii3n !^2S Bwtn Ave., Foatuu CA
3233K, »32"T7ia,
San lose CA
Bay area's newest BmBteur radio stor*r New
St used amaleur radio sales ic service. We
feBturc Kenwood. ICOM, Azden^ Yaisii, T«i-
Tec» Santec k many mdre. Shaver IR4di<i> Itw-^
13TS &), Bftwcnn Av«>, gan joK CA »S1£8,
S9S-1103,
New Castle DE
F&etoty Authoriawl DtaJeTf Vaesu^ ICOM^ Ten-
Tec, KDK, Aiden, AEA, KaiviKPiiks, Santec. Full
line of ajccessorje}. No sales tax in I>eiaware, One
mile oH 1-^5. DdawaR Antitnir Supply, 71
Um&i^ Ruct, Htw OHlie PE 10720^ 32S-7723.
Rocky Mountain area's newest hmn dealer. Call
ajM fir# for AKA. A^jJcn. KDK, Ten-Tec, But-
temut, CbkhcraR, and maref BJM Electronics,
4204 Overlaixl. Bmae ID S37Q5. 343-4018.
Preston ID
Ross WB7BYZ h&s the larfSDist stock of amateur
gear in the Intermountain W«tt ai>d t}»« best
prkes. Call me for alt ^our ham needs. Bos
Distribudn^, TS So. State, Fiestvci ID e33j63,
852^0530,
Littleton MA
The riilinM^ ham store serving NE. Full line of
TCOM & Kenwood. Vaesu HTs. Driike, Daiih-a,
B^W ao«e£$f»HeA. Curtis £e Trac keyers. Larsen,
Hustler, Tdes/Hy-Gain pnoducfa- Mitag)^
ampfi^, Astron P.S-, Alpha Delta protectors,
ABRL & KantruTucs instrurtiDn aidi- Whfetitr
radar def^iCtors. Pull line of coax fitting.
TEL— COM EkctTDnic CammuTiJcatii)^^ 675
Great Rd. (At. 119), Uoktan MA 014$0,
4dti-3400/3lHO,
Aim Arbor MI
See us for products Like Ten-Tec^ R. L. Drake,
D^Trtin and mSufly mcm. OpW Monday tkKHJgti
Saturday, OftM to 1730. WBSVGR. WBBUXO,
WDflOfcN, and WfiRP behind the eounttr, Ptir-
thmat Radio Supply^ 337 E. Hoover Ave., Aim
Ar^r MI 4S1Q4, 665-96^,
Livoiiiii MI
Complete ptuytovaJittic systems. Amateur radio^
repeater, satellite, and computer a[>p]!i{:ation<;1
CfiJi Fad WDAAHO. Emkdo FliotDvoltaJcs,
27W0 Schw>Jw*ft Rmd, Uvflnia Ml 4SL50,
523-1 S50.
Hudson NH
Look!— hanis, SWLs, *r»d eirperimenters:
parts, bfxiks, fS^t^ antennas, lowers. Call fur
qtioie. Pokari'i ELECTRONICS CEftfTEH,
«1 LowdL RfHfi (Route 3AK Uvdson NH QQ061,
PROPAGATION
Albany, New York
UPSTATE NEW YORK
KpTiwtJrtd;, ICOM, Tcn-T*, Bdden, Cushcraft,
Larsen, Hustler, ARRL, Hy-Gain, BdcW, MFf,
Mtra®P. Nc>w and tLwd ec^uipnient. Serving the
amateur community since 1S42, Adirondack
ElectnwUts* Ijtic.,. Ifl&l C^witral Averme^ Albany
NY 12206, 456-0203 (one mile west of Northway
wit 2W),
Columbus OH
The bigg^And b«st ham slant in the Midwest
featuring Kenwood and other quality produces
with wuiking displays. Wesdl only thtsb^t. Au-
thorized Kenwood servioe. Universal Amateur
RadHi, Inc., 1280 Aida Dr., BeymUbburg (Co-
lumbua) OH 4306$, M&^2£7.
Scranton PA
ICOM, Biird, Cushcrftft, Beckman, Fluke, Lar-
sen, Husder. Antenna Spedallsts^ Astfon, Avan-
ti, Bdden. WiAU'WaVS. AEA, Vibroplot.
Ham Key, Amphenol, Sony, E&W, Coas-S^,
Cover Craft, |.W. Miller/Dal wa, ARRL.
Ameco, Shure, LnRue: Elertroniras 1112 Crand-
view St., Scranbm PA ISSOO, 343-2134.
Dallas TX
IBM PC/ Apply aftcriibflfket products^ hobbyi^'
et^ronjcs project kits: t50.(X) complete modem
kit, subsmptioW»tellit& TV decoder kits,
ETROM programntef/dupLicatiOr, poptilnr
memory IC testers, dat* sJMiels, application
notes^ and more than 6000 parts in sbvck- S^^ni)-
conductOTi, diWTi-'tc!, video products,, took,
Please write for your free liteTtttiireTdftt^og. Iifc*
deii@Klcnt t:i«cti[tmk$, 6415-06 Airline Rd.,
Dallas TX 75205.
Baltiinore/Washtngton
Avantek transistors, ampHfiei^. oeiC:|],lati>r<t, *nd
LNA^. CoAid&l CAbh end connectors. Blonder
Ton^^e dealer with Microwave laboratory. Ap-
plied Spedaltiea, bic, 1D1(»1G Bkcon Drjvt,
BeltsvUb MD 30705. WsA. SBS-SSBa, BalL
732-2211. 7l30 am to 6:00 pm, Monday thru
Friday,
DEALERS
Your company name and message
can oontain up to 25 words for as
little as $150 yearly (prepaid)^ or
$15 per month prepaid quarterly).
No mention of mafl-order business
or area code permitted. Directory tejrt
and payment must reach us 60 days in
advance of publication. For e^jtample,
advertising for the May '84 issue must
be in our hands by March 1st. Mall to
73 Magazine, Peterborou^ NH 03458-
ATTN: Nancy Ciainpa.
J, H. Nelson
4 Plymouth Dr.
Whiting NJ 08759
EASTERN UNITED STATES TO:
GMT:
W
as
114
oe
flS
io
12
14
iG
te
^
22
AUAS.KA
14
14
7
7
7
7
7
7
7A
14
14
14
ARGE^I^TIIttA
n
14
14
14
7B
;e
3:':
21
21A
21A
21A
21
AUSTRAUA
2l\
14
14
7B
7B
7B
7B
i4E
L4B
14 ■
21
21A
CANAL ZONE
14A
J4
7A
7
7
7
t4A
:i
21
2\A
aiA
21
£M(^LA»|?
7
7
7
7
7
7
14
14A
L4A
il
14
14
HAWAII
21
U
7E
7B
7B
7
7
7
14
14A
2\
^21A
INPtA
lA
7B
7E
711
7B
76
14
14
14
14
]dt
14
JAPAN
14a
14
7E
7B
7R
7B
7
7
7
14
14
14A
MEKICO
ii
14
7A
7
7
?
7
14
14A
21
ilA
21
PHILIPPINES
lAA
14
7B
7S
IB
7E
7B
]4B
14
J4
]4
14A
PliEHTO P4CC9
14A
14
7
7
1
7
14
14A
21
JlA
£1
2]
SOUTH AFRICA
14
7B
7
7B
7B
U
21
21
21A
21A
21
UA
U. S. S. R.
7B
7
7
7
7
7B
14
14
14A
14
14
7B
WEST COAST
21
14A
7A
7
7
7
7
14
14a
21
21A
21A
.. ..-,.-. -^^.^- ^^
CENTRAL UNITED STATES TO;
ALA&KA
14
14
14
7 7
7
7
7
14
14
14
14A
ARGENTINA
11
14
14
ML
7[1
7E
li
21
21A
21A
21A
2!
AUSTRALIA
ZlA
14A
14
7S!
7ft
7B
7B
14ft
I4n
14
21
2 LA
CANAL ZONE
SI
14
7A
7
7
7
14
14A
21
21A
21A
2U
eNOLAN-D
7B
7
7
7
7
7B
14B
14
14A
14A
14
14
HAWAII
21A
21
14
7
7
7
7
7
14
14a
21
ZLA
INOIA
14
14
7B
7E
7B
7B
7B
14B'
14
14
14
14
.JA43AN
14A
14
S4B
7B
7B
7B
7
7
7
14
14
14A
MEXtCO
14A
14
7
7
7
7
7
14
14 '
14
21
21
FHILfPlflNEE
I4A
14
14b
7B
7B
7B
7B
7
L4
14
14
14a
PUERTO RICO
21
14
14
7
7
7
7A
14A
Zl
2\A
21
21
SOUTH AFAICA
14
7B
7
7B
7E
7B
14
Zl
Z\
21A
21
I4A
U.S.S, H-
7B
7
7
7
7 7B 1
7B
14
14A
14
14
7B
WESTERN UNITED STATES TO:
ALASKA
14
14
14
14
7
7
7
7
14
14
14
14A
ARGENTINA
21
14A
14
14
?B
7R
7P
14A
!1A
^lA
21A
21
AI^STRALIA
21A
lU
21
14
14
14B
7B
14B
14B
14
21
21A
CANAL ZONE
21
14
lA
7
7
7
14
14A
21
23a
2iA
2lA
HHGt-MiO
7B
7B
7
7
7
7H
7B
7B
14
14A
14
14
HAWAII
21A
Zl
Zl
14
14
7A
7
7
14
21
21
21A
INDIA
14
14A
14
7B
7B
7B
7B
7B
14
14
14
14
JAPAN
21
lAA
14
14B
7Fi
7
7
7
7
14
14
14A
[VtEXICO
21
14
14
7
7
7
7
14
14
1\
21
21A
PHILIPPINES
2]
14A
14
14B
7B
7B
7B
7
14
14
14
14A
PUERTO RICO
21
14
14
7
7
7
7
14
14A
21
21A
21
SOUTH AFF^ICA
14
7B
7
7B
7B
7B
7B
14
14A
21
21
14A
U. S.S.fl.
71
7B
7
7
7
7B
7B
14B
14
14
14
7B
EAST COAST
21
14A
y
7A
7 7
7
7
14
14A
31
21A
21A
A = Next higher frequency may also be useful.
B = Difficult circuit this period.
First letters night waves. Second = day waves.
G-Good, F = Fa}n P = Poor. * = Chance of solar flares,
#- Chance of aurora.
NOTE THAT NIGHT WAVE LETTER NOW COMES FIRST.
SUN
MOM
TUE
April
wtu
THU
HH
SAT
1
F/F
2
F/F
3
F/G
4
G/G
5
G/G
6
G/G
7
F/G
8
F/G
9
G/G
10
G/G
11
F/G
12
F/F
13
F/F
14
F/G
15
G/G
16
G/Q
17
G/G
18
G/G
19
G/G
20
F/F
21
P/F
22
P/F
23
F/F
24
F/F
25
P/F
26
F/F
27
Q/G
28
Q/G
29
F/G
30
G/G
162 73 Magazine * April, 1984
NEW GALAXIES OF PERFORMANCE ON VHF AND UHF
FULL DUPL
TELLITES!!
SCATTER!!
■^TTIU'I
1
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■
u
^. -' -*
T
YAESO WUt^ MJ.
n /viflfloc
rti an-
vA
--- iD^*i
'"Tf>
Tn-
iM«**
The New Yaesu FT-726R Tribander is the world's first multiband, multimode Amateur transceiver capable of
full duplex operation. Whether you're Interested in OSCAR, moonbounce, or terrestrial repeaters, you owe
yourself a look at this one-of-a-kind technological wonder 1
Myltiband Capability
Factory eciuipped for 2 meter operation, the FT-726R Is a three-band unit capable of operation on tO meters, 6 meters, and/or two segments of
the 70 cm band (430-440 or 440-450 MHz), using optional modules. The appropriate repeater shift is automatical fy programmed for each
module. Other bands pending.
Advanced Mfcroprooessor Control
Powered by an B-btt Central Processing Unit, the ten-channel memory of the FT-726R stores both frequency and mode, with pushbutton transfer
capabilily to either of two VFO registers. The synthesized VFO tunes in 20 Hz steps on SSB/CW. with selectable steps on FM. Scanning of the
band or memories is provided.
Full Duplex Option
The optional SU-726 module provides a second, parallel IF strip, thereby altowing full duptex crossband satellite work. Either me transmrt or
receive frequency may be varied dunng transmission, lor quick zero-beat on another station or for tracking Doppler shift.
High RerformarK^ Features
Borrowing heavify from Yaesu s HF transceiver expenenoe, the FT-726R comes equipped with a speech processor, variable receiver bandwidth,
IF sbift* all-mode squelch, receiver audio tone control., and an IF noise blanker. When the optional XF-455MC CW filter is installed. CW Wide/
Narrow selection Is provided. Convenient rear panel connections allow quick interface to your station audio, linear amplifier, and control tines.
Leading the way into the space age of Ham communications, Yaesu 's FT-726R is the first VHF/UHF base station
built around modem-day requirements. If youYe tired of piecing together converters, transmitter strips, and relays,
ask your Authorized Yaesu Dealer for a demonstration of the exciting new FT-726R, the rig that will expand your DX
horizons!
Price And Specifications Subject To
Change Without Noltce Or Obligation
The radlOm
483
TAfSU
■83
YAESU ELECTRONICS CORPORATrON 6851 Walthall Way. Paramount, CA 90723
YAESU CINCINNATI SERVICE CENTER 9070 Gold Park Drive, Hamilton, OH 4501 1
(213) 633-4007
(513) 874-3100
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^SJir^-fE TUNE
PITCH -^ A F TUNE
i
Superior dynamic range, auto, antenna tuner,
QSK, duai NB, 2 VFO's, general coverage receiver.
TS-930S
The TS-930S is a superlative, high per-
formance. ail'SoUd state, HF transceiver
keyed to the exacting requirements of the
DX and contest operator. It covers aU
Amateur bands from 160 through 10
meters, and incorporates a 150 kHz to
30 MHz general coverage receiver having
an encelFcnt dynamic range.
Among Its other Important features ard
SSB slope tuning. CW VBT, IF notch filter,
CW pitch control, duai digital VFO's, CW
full break-in. automatic antenna tunefi
and a higher voltage operated solid state
final amplifier* It is available with or
without the AT-930 automatic antenna
tuner buUt-in^
TS-930S FEATURES:
• 160-10 Meters, with 160 kH2-30 MHz
general coverage receiver.
Covers all Amateur frequencies from 160*10
meters, including new WAKC bands, on
SSB. CW. FSK, and AM. Features 150 kll^
30 MHz general coverage rec^eive^r Separate
Amateur band access keys allow speedy
hand selection. UP DOWN bandswitch in
I -MHz steps* A new. innovative, quadruple
"UP" conversion* digird PLL synthesized
circuit provides superior frequency arcurBcy
and stability, plus greatly enhanced
selectivliy. "
* ExceUent receiver dynamic range*
Receiver two-tane dvnaniic range, 100 dB
fyplcal (20 meters, 50-kHz sp 500 H/
CW bandwidth, at sensitivity ui u.zd ^v.
S/N 10 dB]. provides the ultimate in rejec-
tion of IM distortion. .
* All solid state, 28 volt operated final
amplifier.
Tiu? tin; 1 1 jiriipiiUfr ope rates on 28 VDC for
lowesi IM clIsLortinn. Power input rated al
250 W r*n SSB. CW. and FSK.and at 80 W
on AM. Fltial anipUfier protection circuits
with eotiling fan, SWK/Power meter built-in,
• CW full break -In.
C:W lull break-in circuit uses CMOS logic IC
plus reed relay for smooth* quiet operation.
Sw^itchable to seml-bptak-in.
• Autom&tic antenna tuner, built -in-
Covers Amateur i^ands 80 10 meters.
Including the new WARC bands- Tuning
range autoniallt^illy preselected with band
selection to minim iite tuning time. "AUTO-
THRU" fswlirli on front panel,
• Dual digital VFO*&.
10-Hz step dual digital VTO's include band
Infonnation. Each VTO tunes continuously
from band to band. A large. heavT^% tlywl:>cel
type knob is used for improved tuning ease.
T.F. Set switch allifv^ ^ liisi transtnit
frequency t^eltlng for split- frequency opera-
tions. A=B switch for equalizing one VFO
frequency to the other. VFO "Lt>c:k'* switch
provided- RIT control lor ±9,9 kHz*
• Eight memory channels.
Stores boUa frequc^ncy and band informa-
tion. VTO-MEMO swiich allows use of each
memor>^ as an independent VFO. (the
origtriai memor)' frequency can be recalled
at ^xillt or as a fixed frequency. Internal
Battery memor>' back-up, estimated 1 year
life. (Batteries not Kenw'Ood supptiedl.
■ Dt^ mode noise blanker i'^olsc'^
or "woodpecker").
NB-1. wldi Llvresihoid control, for pulsc-t^'pe
noise. NB'2 for longer duration
*w^oodpeckcr" type noise,
- SSB IF slope tuning.
AUows independtnl adjustment of the lowr
and' or high frequency slope of the IF pass-
band, for best tntcrference rejection. HIGH/
LOW cut control rotation not affected by
selecting USB or LSB modes.
• CW VBT an4 pitch controls,
CW* Variable Bandwidtii Tuning
control luncR out Interfering signals. CW^
pitch contrcjls shifts IT passband and simul-
taneously eiiringes iiu* pitch of the beat
frequency. A "Narrow/Wide " filter selector
switch Is provided,
• IF notch filter,
100 kHz \V nolth drryil gives deep,
sharp, notch, i:>cttKr than -40 dB.
• Audio filter built-in*
Tuneable, peyk-type audio filter for CW.
• AC power supply built-in,
120, 220, or 240 VAC; switch selected
(operates on AC only). "
Speciflcntions and prtces
• Fluorescent tube digital dtsplaj^
Six digit readout to 100 1 1/ (10 H/ modi-
fiablei, plus digitalizcd sub-st;ile v^1th
20 kHz. steps. Separate two digit indieatkm
of RIT frequency shtfi. In CW nmde, dis-
play indicates the actual carrier frequency
of received as well as transmitted signals'
« RF speech processor.
RF clipper type processor provides higher
average "tafk-powerr improved irucUigiblllty,
• One year limited warranty on parts
and tabor.
Other features:
• SSD monitor clrcuil:, 3 step RF attenuator;
VOX, and 100-kH^ marker.
Optional accessories:
• AT-930 autt^niciUc antenna tuner.
• SP-930 external speaker with selectable
audio filters.
• VG 455C 1 (5O0 Uz\ or yG'455CN-l 1250 Hz]
plu^ in CW filters for 455-kHz IF
• YK >:4aC 1 (500 Hzi CW^ plu|*'in filter for
8.83-MHz IF.
• VK 8gA I (6 kHz) AM plug In filter for
B,83-MH?. IR
• SO-1 commercial stability TCXO (tempera-
ture compensated crystal oscillatorl.
Requires modifications.
• MC 60A deluxe desk microphone with
UP/DOWN switch, preamplifier. 8-pin plug.
• Tl-r922A linear amplifier (not forCW g^Kl.
• SM-220 station monitor (not for pan-adapter.
• HS-6. HS-5* liS-4. headphotics.
More information on the TS-930S Is
available from all authorized dealers of
Trio Kenwood Communications. 1111 West
Wainui Street. Comptoti, California 90220,
KENWOOD
. pacesetter in amateur radio
are subject to change wiihoiu notice or obfigotfon.
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