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
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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
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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 wide dynamic range iHF receiver designs, the iC-751 is a competition grade ham receiver, a lOOKHi to 30MHz continuous tuning general coverage receiver, and a full featured ail mode soi id-state ham band transmitter, thot covers all the new WARC bands. And with the optional internal AC power supply, it becomes one compact, portabte/field day package.
R»ceivor Utilizing an fCOM developed J-FET DBM, the IC-751 has a 105dB dynamic range. The 70,4516MHz first IF virtually eliminates spurious responses, and a high gain 9.0115MHz second IR with tCOM's PBT system, gives the ultimate in selectivity. A deep IF notch fitter, adjustable AGC and noise blanker (can be adjusted to
eilrriinate the woodpecker )< audio tone control, plus RIT with separate readout provides easy- to-odjust, clear reception even 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 maintain the memories for up to 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
the above features pfus FM unit high shape factor FL44A 455KHz SSB filter, full function metering. SSB and FM squelch, convenient large controls, a large selection of plug-in filters, and a new high visibiiity multi-color fluorescent display that shows frequency In 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- PS35 power supply, high stability 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
ICOMAm^co, Inc.. 21 12-1 1 6th Ave NE, Dellevue, WA 96004(206)454-6155 / 3331 Towerwood Drfw, 5uire 307, Dolbs, IX 75234(214)620-2760
All $roced specificQflons qp? QpprQxinnQti& ond subject ro change wiihour nonce or obligoTion. AJI COM fqdi04 significorirlv exceed FCC regulorions limlrfrtg spurioui emisstom,
751 1 $4
ARI
FOR SIX STORE BUYING POWER!
Phoenix amateurs welcome to our new store! Now take advantage of our increased buying power Enjoy best bargain prices, complete stocks of leading brands^ friendly, helpful; over-the-counter service. ^
KENWOOD
SPECIALS
**_^. M.
TR-7950
TS-430S
TR-2500/ TR'3500
CALL FOR
YOUR LOW
PRICES
TS-930S
Plus 4 BONUS
ITEMS
1) Antenna tuner.
(FACTORY INSTALLED)
2) MC-60A microphone
3) YK'88C-1 filter.
4) SP-930 speaker
REG, $2029 VALUE
$1799
SAVE $230.00
t ■»
2M and 70CM in a single package.
BUY A TW-4000A
FOR S599.95
3Ln6 select two of the following items absolutely free!
1) VS-1 Voice Synthesizer
$39.9S value.
2) TU-4C sub-audible
tone generator S39.9S value,
3) MA -4000 Duo-band Mobile Antenna. S44.95 value.
NEW!
ICOM
*tTs*-TliTV
SALE! SALE!
IC-751 $1229
I 3R tn: WP iW \
HAND-HELDSl
COMPLETE UNE OF ACCESSORIES
2 MTR 440Mhz. IC-02AT IC-04AT
WY/h
FT-757GX
f^C^L
■;>»-**'
FT-208R
CALL FOR
LOW PRICES
ON HAND-
HELDS
and all
YAESU
ITEMS
i ^rrnn
FT-726R
EXCELLENT
FOR OSCAR
FT*708R
KLM
KT-34A
CALL FOR PRICE
KT-34XA
CALL FOR PRICE
SAVE!
ri-Ex
W-51 SALE $849
CALL FOR PRICE
LM-470D
CALL fOR PRICE
Msm
ig
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 ' known amateurs, 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 3PeClALl-STS ■ AF^RL • ASTFIiDN * BfLDEN p BENlCHER BERK 'TEC • &fRO • BUiTEFir+UT * B A W • CALLrSOOK • COLLJN'&
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 StiUftE • SEiSNAm^^E * STONER • TEMPO • TEh|-TEC • TR^STAd
VI£WSTAFI • VOCOM * VAESU and rnan/ mcHoJ
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^ ic^pls with drawings vidtatf ptHto- Oraph« Mm wvlcome mM «41l b* ooiv
■.kteFpd for po«albi« pul>lkHTi<Hi. Wi cun Maunw no rs&ponsi&lllly fof IcVH or dama{)e to arty maCafSiiik, Ple«H 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- ractfld la Itw 73 tdtlort*! OftkC«^ ^Hbw iQ Wt4tfli for 7S' guicMinai «• •viilatiiii upon r«quaii
Editorial Offices:
PMvtenugh NH 034^
Advertising Offices:
ENi &tri PttotKnxigh KH 034M Phons 603^4.7138
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In Ih* Unt|«d 3lfltM and Po»ft«ukE)nfi: Om Ywr (13 luues^ tSS.OO Two Vevs (£4 iuuoi) i^&.QCr Thrve Ymts (3i laaua*) ^3.00
Efsewtiere:
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muM -tfUJTyi yHf Grty. US tk>riQi on lia
To subscribe,
renew or change
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VMI* to 73, S<d»cfl'EMloii Dapwtmant. 90 Sot 901. Farmiri{}da'ff NY 117S7 For I'tnewiiA and changoa of addran, Includs ffW' addm* tubil from ycui' nioflt r^jfiont Issue of T3. Pot Qift aub- Hflplkma^ inctuds your nafna and ui- dfMft u wbM as thciafl ol gtfi r«cl-
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fBSH QT4S'0SD)0 b pybtMTwt rrvyimDr Bf VM|liB Gf^B\ tt, 8P Ptna StfH^ PMarbiMufl^ NH 0346a. 5«l»nd CdHt cotiga £ttld St POEfftnou^ P«4 03468 and iH ^tsmoFOi moiftlng Oinicaa. fntliii somantt upyTfahi= iflS4. Ws>iv Qnvx mc AH ilt^rta rawvad No pvt of mla piOicattan may tia laprtmad or otfiaMaa rapuxjucad wtttiouc wfittvi parrnlaakin Iram Uie puNti^w bUtrfCk tlim edltbori — iMhwaHy MkdtM'im, Ann Ai&Qr Mi iBtoe. Poatmular Send ad- dnaa chanpn ti? 7:3, Subocdptkin Sac ^riQ«a, P>0 BoK 9111, Fftfmknoclala MV 11737. NflHonally dialributed tiy In- timaikMiai C4rcuk«tloo D4ainbulpra,
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.
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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! ■
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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
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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
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18 73 Magazine • April. 1984
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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
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t
ADAPTOfl TO PROVIOC
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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
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OEFLECTIOM PLATES
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"fh
CT?T
DCfLECTION
PLATtS
^f
^hr
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04 ^P lOOOV
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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.
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Fig. 3. Isolating rf and nor- mal scope s/gfia/s,
73 Magazine • April, 1984 21
OPCRATINC PICK Ufr
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f /g. 4. The typical adaptor circuit of the 1960s.
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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
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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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TRAM SWR/Wattmeter Fully airtomatic ar^d self cahbratmg - r^o adjusting Dual illuminated meters show both Watts output aod VSWR simultaneously? 50 Ohms; L8-30 Mhi. 0 20. 0-200 and 0-2000 Watt powei ranges ■ 5% accuracy, or^ly 10% of full scale power requrfed for VSWR reading;. Remote RF sensor with 50" cable, AC adaptor supplied oj use 6 '^C" cells. 7^ w - 2^'^h « S^/^'d 90-rlay AES Warranty. Originally was $1 19»^,. ClOSeout $69"'^
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Non-inductive 50 ohm dummy
frioad. Assembled /tested - with
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VSWR: 1.1: 1 to 30 Mhz
i 397:1, 30 to 300 MHz
Size/Wti7V)^b«6^"d;8'/Hbs.
$29
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MT-3000A L8'30 MHz. 3 KW PEP FWD/RtF meters, antenna switch , 250w dummy load. 41 balun Tunes coax, wires and balanced Ime. 5^.i"h* 14"w* 14 "d
Regular $399'"^ - Closeout $329^^
CJipperton-T L8 to 30 MHz continuous. 2 KW PEP. SWR wattmeter, antenna switch, bypass sw, built-in 4:1 balun. Tunes coax, wires, balanced line. 14Vfl"w«6"h"14';^"d.
Regular $329^^ - Sale Price $249^^
GLT-IOOO 18- 30 MHz continuous, 1.2 KW PEP SWR wattmeter, antenna switch, bypass, built-in 4:1 batun. Tunes coa* wire, featanceri Ime. 1 rw"4^"d" 12''d
Regular $1 98^' - Sate Price $179''
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UOO/C 14* Composite vjdeoCOlOR monitor tJsewtb Apple. Atan, IBM. Commodore computers, etc But^l-m speaftef and audio circyjl: metal cabinet ]^^*' il'^'* Wm\ 2B lbs. (Regufar $399.00} ,, SALE $299*^
W-2 Wattmeter, (left) 1.8 to 30 MHz: dual meters simultaneously show forward and retlected powef FWD scale 200/2000W, R£F. scale - 200w, 5% accuracy Sensor box locales up to 4 ft away. 3^""7"w*6"d.
Regular $129^^ - Closeout $79^^
Hulti-PSlO (right) 10 KOhm/VVOM and 20/200wRF wattmeter/SWR bridge. 3.5 to 150 Mt\z. 2W" scale.
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
• AfiRL AND FCC FORUMS
• GIANT 3-DAY Fl-EA MARKET
Starting Noon Friday
All Day Saturday and Sunday
• NEW PRODUCTS AND EXHIBITS
• GRAND BANQUET
• ALTERNATIVE ACTIVITIES
• ELECTRICAL SAFETY FORUM
• SPECIAL GROUP MEETINGS
• YL FORUM
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ADMISSION
$7.50 in advance, S 1 0 at door. {Valid for ail 3 days)
BANQUET
S 1 4 in advance. S 16 at door.
FlEA MARKET SFACE
St 5 in advance. (V^lidforaU3day5)
Checks for advance registration to
Dayton HAMVENTION Box 2205. Dayton. OH 45401
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, Dayton. OH 45401.
For special motel rates and reservations write to Hamvention Housing. Box 1288. Dayton, OH 45402. NO RESERVATIONS WILL BE ACCEPTED BY TELEPHONE.
All other Inquiries write Box 44. Dayton, OH 4540 1 or phone (51 3) 433-7720,
ALL Flea Market spaces will be sold in advance ONLY NO spaces sold at gate. Entrance for set-up available starting Wednesday. Special Flea Market tele- phone {513) 223^923,
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
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You can DX and receive weather charts from around the world.
Tune in on free, worldwide government weather services. Some transmitting sites even send weather satellite cloud cover pictures!
You've heard those curious facsimile sounds white tuning through the bands • now capture these signals on paperl
Assemble ALDEN's new radiofacsimile Weather Chart Recorder Kit, hook it up to a stable HF general-coverage receiver, and you're on your way to enjoying a new hobby activity with many practical applications. Amateurs, pilots, and educators can now receive the same graphic printouts of high-quality, detailed weather charts and oceanographic data used by commercial and government personnel.
Easy to assemble— Backed by the ALDEN name.
For over 40 years. ALDEN has led the way in the design and manufacture of the finest weather facsimile recording systems delivered to customers worldwide* This recorder kit includes pre-assembled and tested circuit boards and mechanical assemblies. All fit together in a durable, attrac- tive case that adds the finishing professional touch.
Buy in kit form and save $1,000!
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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
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CMOS
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Fig. 2(d}. TTL-to-CMOS (operat- ed from + 5 volt supply).
73 Magazine • April, 1984 31
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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
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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,
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F/g- 2fgjL Universaf TTL to other logic devices, 32 73 Magazine • April, 1964
>
I HOI I
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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
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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
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fig. Jfcft /n candescent tamp in- tracing with PNP transistor.
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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
{
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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
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73 Magazine * Apr! I J 984 35
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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
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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.
OPTION: FCC registered coupler
Inquire about commercial and half duplex models.
i
I
OUR QUALITY GLASS BOARD, SUPERB ENGINEERING AND EXCELLENT COMPONENTS BLEND TOGETHER TO PRODUCE THE FINEST AMATEUR AUTOPATCH AVAILABLE
i
CONTACT A LOCAL DEALER TODAY
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CONNECT SYSTEMS INCORPORATED
P.O. BOX 4155 TORRANCE CA 90510 23731 MADISON ST. TORRANCE, CA 90505 PHONE (213) 373-6803
73 Magazine • April, 1984 37
4
|
NOSH |
■ ■■^■^■kM^^ ^ |
)HAF |
IGES! |
|
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|
IDOIMi^ ff |
1 |
||||
|
llrrlNlj I |
|||||
|
TUBES |
■ ! |
||||
|
TYPE |
PRICE |
TYPE |
PRICE |
TYPE |
PRICE |
|
2C39/7289 |
$ 28.90 |
813 |
$ 42.50 |
7843 |
$ 90.95 |
|
2E26 |
6.75 |
1 1 82/4600A |
425 00 |
7854 |
110.50 |
|
2K28 |
170.00 |
4600A |
426,00 |
ML7855KAL |
106.25 |
|
3-500Z |
86.70 |
4624 |
263,50 |
7984 |
12.70 |
|
3-1000Z/8164 |
340.00 |
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 |
36,00 |
8121 |
93.50 |
|
3CX3000F1/8239 |
482.00 |
5721 |
212,50 |
8122 |
93.50 |
|
3CW30000H7 |
1445.00 |
5768 |
106.25 |
8134 |
399,50 |
|
3X2500A3 |
402.00 |
5819 |
101,00 |
8156 |
10.20 |
|
3X3000F1 |
482.00 |
5836 |
198.00 |
8233 |
51.00 |
|
4-65 A/81 65 |
58.65 |
5837 |
198,00 |
8236 |
29.75 |
|
4-125A/4D21 |
67.15 |
5861 |
119.00 |
8295/PL172 |
425.00 |
|
4-250A/5D2Jr |
83.50 |
5867A |
157,25 |
8458 |
29.75 |
|
4 -400 A/8438 |
83.50 |
5868/AX9902 |
229.50 |
8462 |
110.50 |
|
4-400B/7527 |
93.50 |
5876/A |
35,70 |
8505A |
80.75 |
|
4-400C/6775 |
93.50 |
5881/6L6 |
6.80 |
8533W |
115.60 |
|
4-1 000 A/81 66 |
377.50 |
5893 |
51.00 |
8560/ A |
63.75 |
|
4CX250B/7203 |
46.00 |
5894/A |
46,00 |
85 60 AS |
85.00 |
|
4CX250FG/8621 |
63.75 |
5894B/8737 |
46,00 |
8608 |
32.30 |
|
4CX250K/8245 |
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 |
|
4CX350F/8322 |
97.75 |
6146W/7212 |
14.75 |
8683 |
80.75 |
|
4CX350FJ/8904 |
119.00 |
6156 |
93.50 |
8877 |
395.25 |
|
4CX600J/8809 |
710.00 |
6159 |
11.75 |
8906 |
11.05 |
|
4CXioooA/ai6a |
206.00 |
6159B |
20,00 |
8950 |
11.05 |
|
4CX1000A/8168 |
412,25 |
6161 |
276,25 |
8930 |
116.50 |
|
4CX15OOB/8660 |
471 .00 |
6280 |
36.25 |
6L6 Metai |
21.25 |
|
4 CX 5000 A/8 170 |
935.00 |
6291 |
153,00 |
6L6GC |
4.25 |
|
4CX10000D/8171 |
1067,00 |
6293 |
20,50 |
6CA7/EL34 |
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 |
6D05 |
5.60 |
|
4E27 A/5-1 25B |
204.00 |
6883 B/8032 A/8552 |
8,50 |
6GF5 |
5.00 |
|
4PR60A |
170.50 |
6897 |
136,00 |
6GJ5A |
5.30 |
|
4PR60B |
283.25 |
6907 |
67.15 |
6GK6 |
5.10 |
|
4PR65A/8187 |
148.75 |
6922/6DJ8 |
4.25 |
6HB5 |
5.10 |
|
4PR1000A/8189 |
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 |
|
4X250 F |
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 |
6KD6 |
7.00 |
|
KT88 |
23.50 |
7289/2C39 |
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 |
6ME6 |
7.55 |
|
592/3-200A3 |
179.50 |
7609 |
80.75 |
12AT7 |
3.00 |
|
807 |
7.25 |
7735 |
30,60 |
12AX7 |
2.55 |
|
811A |
12,75 |
ML7ai5AL |
51,00 |
12BY7 |
4.25 |
|
81 2A |
24,75 |
12JB6A |
5.50 |
||
NICORN ELECTRONICS 213-341-8833
10010 Canoga Ave, Unit B 8, Chatsworth, CA 91311
Mimmutn Order 11 J 00 - ho Shipptni Chirgn On fn^M Ordwi - C.O.D. Add tI.6S - UPS Blue Add UOO - Calit. Reudentt Add SVtS Siles fai.
Personil Checks Held Fo' Clemnce VJSA-MC SEND FOR FREE CATALOC.
^203
38 73 Magazine • April, 1984
NO SHIPPING CHARGES!
|
R F TRANSISTORS |
|||||
|
2N1561 |
21.25 |
2N5643 |
13.20 |
MRF245 |
30.30 |
|
2N 1 562 |
21.25 |
2N5645 |
11.75 |
MRF247 |
30.30 |
|
! 2N1562 |
19.99 |
2N5646 |
17.59 |
MRF304 |
36.95 |
|
2N1692 |
21.25 |
2N5651 |
9.39 |
MRF309 |
28.75 |
|
2N2857JAN |
3.49 |
2N5691 |
15.30 |
MRF314 |
24.25 |
|
2N2857JANTX |
3,49 |
2N5764 |
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 |
2N5649 |
17.00 |
MRF421 |
31 .28 |
|
2N2949 |
13.19 |
2N5913 |
2.75 |
MRF422A |
35.19 |
|
2N2957 |
r.32 |
2N5916 |
30 60 |
MRF427 |
14 65 |
|
2N3375 |
14.55 |
2N5922 |
650 |
MRF428 |
39.10 |
|
2N3553 |
1.32 |
2N5923 |
21.25 |
MRF433 |
10.25 |
|
2N3632 |
1319 |
2N5941 |
1955 |
MRF449A |
10,75 |
|
2N3733 |
935 |
2N5944 |
8.80 |
MRF450A |
12.20 |
|
2N3818 |
4.25 |
2N5945 |
9.80 |
MRF4S3A |
15.65 |
|
2 N 3866 |
1 10 |
2N5946 |
12 25 |
MRF454A |
17,10 |
|
2N3e66JAN |
1.87 |
2N6080 |
8.80 |
MRF455A |
13,60 |
|
2N3924 |
2.85 |
2N6081 |
10.25 |
MRF45a |
17.60 |
|
2N3927 |
14.65 |
2N6082 |
10,75 |
MRF463 |
21,25 |
|
2N3950 |
21.25 |
2N6083 |
1 1 25 |
MRF472 |
0.85 |
|
2N4012 |
9.35 |
2N6084 |
12.75 |
MRF475 |
265 |
|
2N404t |
11.90 |
2N6094 |
9.35 |
MRF476 |
1,70 |
|
2N4072 |
1.53 |
2N6095 |
10.20 |
MRF477 |
12.70 |
|
2N4080 |
3.85 |
2N6096 |
13 70 |
MRF492 |
19.55 |
|
2N4127 |
17.85 |
2N6097 |
17.60 |
MRF502 |
0.90 |
|
2N4427 |
1.10 |
2N6105 |
17.85 |
MRF503 |
5,10 |
|
2N4428 |
1.57 |
2N6136 |
18.55 |
MRF504 |
5.95 |
|
2 N 4430 |
1003 |
2N6166 |
34 20 |
MRF509 |
4.25 |
|
2N4957 |
2.93 |
2N6201 |
42.50 |
MRF511 |
910 |
|
2N4959 |
1.95 |
2N6304 |
1 35 |
MRF515 |
1.70 |
|
2N5090 |
11.73 |
2N6459 |
15,30 |
MRF517 |
1,70 |
|
2N5108 |
2.93 |
2N6567 |
855 |
MRF559 |
1 75 |
|
2N5109 |
1.45 |
2N6680 |
68 00 |
MRF605 |
17 00 |
|
2N5160 |
2.95 |
2N5942 |
34 00 |
MRF618 |
21.25 |
|
2N5177 |
1840 |
MRF208 |
13,70 |
MRF628 |
7.35 |
|
2N5179 |
0.88 |
MRF212 |
13.70 |
MRF629 |
2.95 |
|
2N5126 |
47,60 |
IV1RF223 |
11.25 |
MRF644 |
23.45 |
|
2N5583 |
2.95 |
MRF224 |
13.15 |
MRF646 |
25.45 |
|
2 N 5589 |
8.30 |
MRF231 |
9,28 |
MRF816 |
1275 |
|
2N5590 |
9,30 |
MRF232 |
10,25 |
MRFa23 |
17 00 |
|
2N5591 |
11.75 |
MRF233 |
10,75 |
MRF901 (3 LEADS) |
0 85 |
|
2N5637 |
13 20 |
MRF237 |
270 |
MRF901 (4 LEADS) |
1 70 |
|
2N5641 |
10.55 |
MRF238 |
11.75 |
MPF904 |
1.95 |
|
2 N 5642 |
11.95 |
MRF239 |
14.65 |
MRF911 MRF961 |
2.55 1.95 |
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213-341-8833
10010 Canoga Ave, Unit B 8, Chatsworth, CA 91311
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^203
^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
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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
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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, ■
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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
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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
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44 73 Magazine • Aprtl. 1984
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73 Magazine • April, 1984 45
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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
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ADDRESSES OF EUROPEAN SW BROADCASTERS FOR USE |
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IF YOU WAKT QSL CARDS OR PROGRAM INFORMATION. |
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Albania |
Great Britain |
Poland |
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Radio Tirana |
BBC (British Broadcasting |
Radio Polonia |
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Ruga Ismail Qemal) |
Corporation) |
Komitet do Spraw Radia 1 |
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Tirana |
Box 76, Bush House |
Telewlzjl |
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Austria |
London WC2B 4PH |
ul Woronicza 17, 00-950 1. ■. I |
■ |
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Austrian Radio |
Gre#c« |
Warszawa |
! |
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Short-Wave Service |
Voice of Greece |
Portugal |
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A-1136 |
PO Box 19 |
E)cternal Relations |
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Vienna |
Aghia Paraskevi, Attlkis |
Av, Engl Duarte Pacheco, 5 |
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Belgium |
Athens |
1000 Usboa Romania |
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BRT |
Hungary |
Radio Bucharest |
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PO Box 26 |
Radio Budapest |
PO Box 1-111 |
(I ! |
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6-100 |
Brody Sandor 5*7 |
Bucuresti |
!, |
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Brussels |
H-1800 |
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Bulgaria |
Budapest |
Spain Radio Naclonal De Espana, SA |
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Radio Sofia |
Italy |
Apartado 150,039 |
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BuigarJan Dragan Cankov 4 |
Radiotelevlslone Itallana |
Madrid 24 |
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1421 Sofia 21 |
Viale Maszini 14 |
Sweden |
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.^K L k 1 " |
00195 Rome |
Radio Sweden International |
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Czeclioslovakia Radio Prague 12099 Vinohradska 12 |
Luxembourg Radio Luxembourg Villa Louvigny |
S-105 10 Stockholm |
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Praha 2 |
Switzerlend |
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r 1 '□1 m & |
Pare Municipal |
Swiss Radio International |
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Finland |
Matta |
Giacomeltistrasse 1 |
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Radio Finiand |
Xandir Malta |
CH 3000 |
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PO Box 528 |
PO Box 2 |
Bern 15 |
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Helsinki 10 |
Valletta |
U.S.S.R. Radio Moscow |
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Franc© Radio France Internationale PO Box 9516 |
Monaco TWR Monaco PO Box 141 |
Pyatnitskaja ylltza 25 , Moscow |
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Paris 16 |
Monte Carlo |
Radio Kiev Radio Center |
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Germany (West) |
Netherlands |
Kiev |
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Deutsche Welle |
Radio Netherlands |
Ukraine |
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Postfach 100444 |
PO Box 222 |
Vatican |
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D-5000 |
1200 JG |
Vatican Radio |
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Koln 1 |
Hiiversum |
Vatican City |
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Federal Republic of Germany |
Norway |
Rome |
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Germany (East) |
Radio Norway |
Yugoslavia |
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Radio Berlin International |
Postboks 6701 |
External Broadcasting |
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160 Berlin |
SL Olavs PI. |
2 Hildendarskaa |
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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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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
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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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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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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
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'RTTY TODAY"— Table of Contents
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Chap. S RTTY Converters You Can BulCd
Chap, 6 Ded^ c ated RTTY Term i n al s and Systems
Chap. 7 New Mini-RTTY Systems
Chap. 8 Fascinating RTTY Outside the Amateur Bards Press— Military —Weather, Etc.
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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^— CWJLFrtANKWCSQZUORJOEKASROO
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66 73 Magazine • April, 1984
COUUD
THE
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Here's a system-specific magazine written with you in mind. Written by and for the reader to give time-saving, money-saving hints. You'll get instruc- tions and tutorials to increase your skills, and candid reviews to help you make the right decisions. Most of all though, you'll have fun.
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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
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MODEL tkiF4,t4ii3
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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
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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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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
|
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M3 |
SCAN |
|
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|
M4 |
M5 |
M6 |
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SANTEC Handhelds just got a little smarter, with new com-
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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
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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/
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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 |
2.99 |
|
Radio Shack |
1.29 |
|
Circuit Specialists |
|
|
PO Box 3047 |
|
|
Scottsdale A2 85267 |
3,19 |
|
Radio Shack |
1.39 |
|
Radio Shack |
.79 |
|
Radfo Shack |
.89 |
|
Radio Shack |
.89 |
|
Radio Shack |
15/1.98 |
|
Radio Shack |
449 |
|
Radio Shack |
2/39 |
|
Radio Shack |
2/1:19 |
|
Radio Shack |
2/.89 |
|
Radio Shack |
4.79 |
|
Radio Shack |
2/.59 |
|
Radio Shack |
2/.8d |
|
Radio Shack |
1.59 |
|
Radio Shack |
1.69 |
|
Circuit Specialists |
1.80 |
|
Radio Shack |
10/. 99 |
|
Fladio Shack |
10/. 99 |
|
Radio Shack |
m |
|
Radio Shack |
2IA9 |
|
Radio Shack |
1.09 |
Radio Shack Radio Shack Flesher Corp, Flesher Corp. Radio Shack Radio Shack Radio Shack Radio Shack
»u9
1.09
37.50
4,80 6.00
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 Antenna Equipment^^—
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!
^'W
•s\
\^\%^
1^%'^''
Put a broad bandwidth BOM d/pole in 24 ft with the SLINKY DfPOLE^ antenna. Comparable lowSWR, space savings and performance on ALL HF bands, including SWL and WARC, Complete kit; 2 special 4" coils. 50' RG-58/U coax baiun kit, mounting hardware and instructions. Great for apartments, condominrums. motels and vacation use. Easy set up and adjustment
Ask for FREE antenna companson sheer
BfAcksburg Group
Box 242 Suite 500 Biacksburg. Vrrginra 24060 703/95 1 -9030
167*95 postpaid (in USA
Money Back Guarantee 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 Culver City, CA
Our Prices Are Competitive
I For Orders Only Please Call
' For trades or other information call our
CA headquarters in Culver City.
800-648-3962
Reno, NV
^Special Sale
TM-g01
TR-25C10^ Includes one PB-2&H Battery
TR*3500. includes one PB-25H Battery
TR7950
TR9130
TS-e30S (Choice of SOOcy CW Filter or SP'230>
R^IOOO, R^2000. HaiO
* Special Sale
FV-707OM
FTV^QOIR
FV-lOtOM
FV-901
YR-901
^Special Sale
IC*25A. tC^25H
IC-290H
10-606
(C-730
IC-740 10-745
KENWOOD TS-930S
ICOM IC 751
YAESU FT-ONE * Super Special - CUBIC 103 with power supply (quantities limited) ^$895.00
We Service What We Sell • We Stock What We Advertise
Call Us On Our 800 Numbers For Our Specialsi "Aqui Se Habia EspanoP
3919 Sepulveda Blvd. Culver City. CA 90230 (213)390-8003
viiiftSdt 9 no d m Id 6:00(1 in
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Reno. Nevada 89502
(702) 827-5732
Tuvi. •Hat 10-00 .i.m tci 4:00 p.m.
In San Diego P.O. Box 1762 La Mesa. CA 92014 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- formance. Gain the satisfaction of building the HD-3030 Computer Interface Ternninat - then simply nde the waves around the world,
*Oplional accessories includG Ibe HD 3030-2 425/050 Hz universal filter, HD-3030-4 170 Hz ^"^"^ narrow band preselector and the HDP-1010/ HDP4020 CW and RTTY software programs for the Heaih H-8 and H-B9 computers.
FREE CATALOG!
Write today: Heath Company, Dept 01 1-164, Benton Harbor, Ml 49022,
Or visit your local
Healhkit Electronic
Center "
•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. HOUSTON
PRICES SUBJECT TO CHANGE WUHOUT NOTICE.
ITEMS SUBJECT TO PRIOR SALE,
Electronics Supply
New Night 800 Number 5-10 p.m. CST, Mon., W^d., & Fri
1508 Mc Kinney
Houston. Texas 77010
Xafl For Quotes
71 3-656-026S
We stock wtiot we advertise,
and mucti more.
(Night Only) 1-800-231-1064
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
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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
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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
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Satellite unit , , .
430 module .
Filters. Tones available
Santec ST142
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it^ m t ^^^nr ■■■■■■ ■■ ■■ LI h H
ST7T ..,..,.,.,..
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HL25 160V , .
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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
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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
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||
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SOLENOID
^"^ ] -^
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Lr -ei #20 !l/4iiT. DIA. kSm. L0PH5
fn
35V TANT
LM3J7
£70
fff
SOOpF
I
-*»+£4V
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5SV TAMTALUM
f /g. 2. The original circuit diagram. The MRF-901 proved to be very unstable in this configuration.
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73 Magazine • April, 1934 87
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1
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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
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LMStT
270
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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. ■
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88 73 Magazine * Aprii, 1984
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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.
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73 Magazine • April, 1984 89
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00 73 Magazine • April, 1984
A|^ ^«pK^
f^tt fm RffCArfii
TTilrtP i.>
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SCff
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#;«^^ft^iLjef
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During^ the Grenada Crisis,
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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
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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. ^^^^
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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
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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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73 Magazine • April, 1984 107
ft 3 noon
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Fig a A itxed-Q -SVf tUtef.
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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-
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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 — '^ —
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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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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
^
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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
CALL LONG DISTANCE ON YOUR HANDHELD
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73 Magazine • Apri], 1984 113
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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- quate. Moreover, a close ex- amination of the peak of the response curve will reveal ir- regularities compared to the theoretic ideal, but these will always be too small to make a difference to CW or to phone reception. In short, for all practical purposes, home brew can be as good as commercial when it comes to simple audio fil- ters to enhance reception. To the degree that we can customize the design to our specific needs, they might even be better than com- mercial for some hams.
The purpose of outlining these procedures is to re- duce the design of custom ham CW bandpass filters to a series of steps that ensures not only a filter that works. but, as well, a filter
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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
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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
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Moum ^tmg mhj
tt} 30W 14S^17S
MPF24fl ^\ MW 14S-175
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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 $360 Shipping RF Parts Catalog Avail OEM & Quannty Discounts
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1 320 Grand Ave, San M arcos
Calif ornia 92069 (619) 744-0728
Jim Tumet K5YZS
103 KaHa OHw
WMtahouse TX 75791
^^^w^.^^v
13313 Forest Hill Rd Grand Ledge, Ml 48837
New Phone: (517) 626-6044
6-10 P.M. Sun. tKru Hiurs
SEE YOU AT DAYTON!
LOOK FOR OUn PEOPLE IN THE PED 4i WHITE JACKETS.
L
HAM SOFTWARE for COMMODORE M & VtC-^ (H. IH)
Tilt log BoelL a general putpose orDgfain lof ttiA^^ : <r^»y !i>i \!&t c^^ ciand. OTH i OSL SUlim). f«4iiewng A (opbonailyl
Oftfitmg OSOs t&24 ^. postpaid US;^ T>ii Cm^it likof Bf. a fui haiuffrt cofrtesi loggng^dupe cntdong aid tor the rmd-Jefei covviisfer dJI 9S. postpaid USA) Tta 0«pv Ch&clec l>r tliose who log OSO^ by hand ^ erriar the bind onee lDrdiingeit)andllOlltaecai$ 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;:::: ^^
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$55 Off!
ALLIANCE
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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 $7 for UPS shipping charges in the 48 States.
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AMATEUR
ELECTRONIC SUPPLY*
4828 W. Fond du Lac Avenue
Milwaukee. Wisconsin 53216
Phone: {414) 442 4200
Wisconsin WATS: 1-000-242-5195
Nationwide WATS: 1-800-558-0411
AES Sr^ncK Stores in: Oearwater. FL * Orlando. FL • Wickliffe, OH • Las Vegas. NV
KiiK^g^^ffnp
Sae List ot Advertisers on page 130
73 Magazine • April, 1984 115
NEiy PRODUCTS
DANISH SWITCHES ARE MADE USER'FRIENDLY
MEC, « D4nl$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.
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c AprF |
ALENOAR HotkSay-ln-0<itla QSO Party |
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Apr 21-22 |
OftP Amateur Radk) Club April QSO Party |
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Apr 28-29 |
Ua aaachuseHs QSO Pirry |
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Apr2i-29 |
County Huntara SSB Conl^l |
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A|ir 28-29 |
Hehretta Contest |
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llayS-« |
Lite S|Kin$r QRP SSB Actlvtty Wftikand |
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WayS-e |
f lorkla QSO Parly |
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May 19-21 |
Michigan QSO Party |
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Jiin9-10 |
ARAL VHP QSO Party |
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Jun 23-24 |
ARFtL Fiald Day |
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JutlS-IS |
AS International SSTV-DX Conlaal |
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Aug 4-5 |
ARAL UHf Ci^ail |
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Aug 11-12 |
Maw Jersey OSO Parly |
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Aug 24»27 |
AS North American UHF FSTV^DX Conteat |
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Sep fi-S |
ARRL VtHF QSO Party |
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Sep 15-17 |
Washlrigton State QSO Party |
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Sep 22-23 |
Late Summer QRP CW Activity Weekend |
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Oct fl-r |
ARRL QSO Party— CW |
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Od ta'-l4 |
ARRL QSO Parly— Phone |
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Nov 3-4 |
ARRL Swe«patskeS"CW |
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New 17-18 |
ARRL Sweepstakei— PhOfM |
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0«et-2 |
ARRL 160-Metar Coniait |
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Dm: 8-9 |
ARRL ICMMfltsr Cofiteat |
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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
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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.
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w |
i . ) .'■'. i'.'. . *'■ . b ^ . . . . b J 1. H b Amateur Electronic Supply |
. 41 . .tlQ |
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...b...:,. b. .25.55.115 |
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Amateur-Wholesale Electronic* |
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....75 |
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243 Amateur-WhHOlesale Electronics |
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334 |
Amidon Associates . . |
...,m |
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109 Analog Tech:rhalogy ...... |
...134 |
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71 |
Applied Invention |
....100 |
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AHRL Nationa] Contention |
,= 95 |
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Asttori Corp. ..... . |
B1 |
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228 Austin Dust orrtAmennas. . |
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Autflif Researcli .^.-,i. |
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266 AzjmuthComrTiLCorp. . , . |
45 |
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BHCInc |
.,,.135 |
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202 B & L Ei\g\neef\ng ........ |
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11 |
BaH^ef & Will Eamson Joe. . |
90 |
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177 Barf^ef&WilliamsofiJnc... |
.....41 |
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305 |
Barry Eleciror^ka |
47 |
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476 |
Bash Ecf ucational Servicea |
....129 |
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152 |
Beflcher.lnc, ...,.*,,-»,» |
. 40 |
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BillAshby&Son.. |
....109 |
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BfacksburQ Group. . |
, *4.82 |
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BHtt 5 2 Way. •...•*-..., |
.-...e7 |
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Break Camm, Systems, Inc. |
,.,.109 |
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Broadway Electronics .... |
.,..135 |
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Butternut Electronics |
.66,113 |
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462 CES, Inc |
95 |
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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
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48
45
54
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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
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l\^n WOOQ .1 1 I '.;.».... b . i |
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MCMCcmmuhicatiOns ., |
...60,105 |
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MFJ Enterprises ........ |
Aft AO |
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MHz Electronics ........ |
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Madison Electronics |
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Magnum Distributors, Inc. |
101 |
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Microcomputer Business |
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Applications |
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Micro Control Speciaities |
.......IB |
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Microlog Corporatioa .... |
51 |
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MifageCommunicalio^is . |
153 |
Missouri BadioCenter . 155
130 318 412 137
212
170 148 61 ^4
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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
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Catslog f |
K«m |
Met |
Cal«k»9i |
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BK73C7 |
Behind the Dial |
S 4.96 |
BK7384 |
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CT7305 |
5 WPM Code Tape |
4.95 |
BK73e6 |
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CT7306 |
6+ WPM Code Tape |
4J95 |
BK7390 |
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CT7313 |
13+ WPM Code Tape |
4.95 |
BK7398 |
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CT7320 |
20 + WPM Co6b Tape |
AM |
BK7386 |
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Ct7325 |
25+ WPM Code Tape |
4X |
flK7404 |
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CT7^^4 |
Code Tapes (any tour above) |
1636 |
BK7400 |
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BK7308 |
Contest Coo*5boo*t |
5J95 |
CX;74001 T |
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BK7321 |
A Guide to Ham Radio |
4.95 |
CC740012 |
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BK7322 |
Hcjtitoy Cotnputers Are Hece |
Z49 |
CC740013 |
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BK7393 |
Uving on a Shoestring |
7.97 |
BK738e |
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BK7312 |
The Magic of Ham Radio |
4.95 |
BK7311 |
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BK7340 |
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2.49 |
BK7334 |
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BK73a3 |
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B.95 |
BK7:^S |
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Handbook |
BK73a2 |
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BK7aiO |
Owner Repair of Radio Equipment |
7.95 |
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BK7302 |
Propagatlofi Wizard's Handbook |
6.95 |
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BK7351 |
SSB. . .The Misunderstood Mode |
5.50 |
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BK736a |
VHF Antenna Handbook |
5.95 |
Catalog # BX1000 |
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SG7357 |
Study Guide-Novice Class |
4.95 |
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SG7358 |
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6,95 |
BX1001 |
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CT7300 |
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LB73aO |
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1.95 |
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LB7361 |
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1.95 |
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LB7365 |
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4.95 |
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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
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'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«
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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
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01 oa |
112 |
0020 |
37 |
0119 |
59 |
0029 |
41 |
0016 |
33 |
18 |
|
19 |
0112 |
113 |
0015 |
3 a |
0104 |
56 |
0019 |
41 |
0013 |
34 |
19 |
|
20 |
0116 |
114 |
0010 |
33 |
oo4e |
54 |
0009 |
40 |
0010 |
34 |
20 |
|
21 |
0121 |
11& |
0004 |
38 |
0033 |
52 |
0000 |
39 |
0008 |
35 |
21 |
|
22 |
0123 |
117 |
0159 |
68 |
0018 |
49 |
0149 |
63 |
0005 |
36 |
22 |
|
23 |
0129 |
US |
0153 |
6B |
0002 |
ill |
0140 |
67 |
0002 |
37 |
23 |
|
24 |
0134 |
119 |
0148 |
69 |
0145 |
75 |
0130 |
66 |
0159 |
68 |
24 |
|
25 |
013a |
120 |
0143 |
69 |
0130 |
72 |
0120 |
65 |
0156 |
69 |
25 |
|
26 |
0142 |
121 |
0137 |
69 |
0115 |
70 |
0111 |
64 |
0153 |
69 |
26 |
|
27 |
0004 |
96 |
0132 |
69 |
0059 |
69 |
OlOi |
63 |
0150 |
70 |
27 |
|
29 |
00 OS |
9S |
0127 |
69 |
0044 |
65 |
0051 |
63 |
0148 |
71 |
28 |
|
29 |
0012 |
99 |
0121 |
70 |
0023 |
63 |
004 2 |
62 |
014 5 |
72 |
29 |
|
30 |
0017 |
100 |
0116 |
70 |
0013 |
61 |
0032 |
61 |
0142 |
73 |
30 |
|
1 |
0021 |
101 |
0111 |
70 |
0156 |
as |
0022 |
60 |
0139 |
73 |
1 |
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102 |
0105 |
70 |
0141 |
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59 |
Q\16 |
74 |
2 |
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103 |
0100 |
70 |
0125 |
S3 |
0003 |
58 |
0133 |
75 |
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104 |
0054 |
71 |
ono |
81 |
0153 |
87 |
0131 |
76 |
4 |
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0049 |
71 |
0055 |
79 |
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86 |
0128 |
77 |
5 |
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106 |
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71 |
0039 |
76 |
0133 |
85 |
0125 |
78 |
6 |
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71 |
0024 |
74 |
0124 |
84 |
0122 |
78 |
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109 |
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71 |
0008 |
72 |
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79 |
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72 |
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97 |
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82 |
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112 |
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72 |
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95 |
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81 |
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82 |
11 |
|
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113 |
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72 |
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92 |
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80 |
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115 |
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55 |
0006 |
77 |
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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.
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73 Magazine • April, 1984 133
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NO HARDWARE Of TU REQUIRED' All lf2 it lJon»t vi* ciiiittt porti ind ciblii. C«U nr Hrlt> far iptcHlCitlAn ihttti»
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134 73 Magazine • April, 1934
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73 Magazine • April, 1984 135
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SILICON DIODES |
FEED THRU SOLDER RF CAPACTORS |
||||||
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MR751 |
lOOvdc |
6 Amp 3 |
10/$5.0Q |
100/$38,00 |
470pf +-20% |
||
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MR510 |
lOOOvdc |
3Ainps |
iO/S3,75 |
100/524.00 |
|||
|
HEP 170 |
lOOOvdc |
2 Amps |
20/$2.00 |
1O0/S15.0O |
S/§KOO or 100/$15.DO or |
||
|
JN3209 |
lOOvdc |
ISAmps |
$2,00 |
10/ $15.00 |
1000/$ 100. 00 |
||
|
BVX2 1/200 |
200vdc |
2 5 Amps |
$2.00 |
10/ 515*00 |
|||
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IK213BA |
600vdc |
60Atnps |
$5.00 |
10/ 540.00 |
lOOOpf/.OOluf |
+-10^ |
|
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DSaS-04C |
400vdc |
SOAmps |
$10,00 |
10/ $80.00 |
|||
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IN3269 |
eOOvdc |
160AiQp3 |
$15.00 |
10/SJ20.00 |
4/Sl.OO or 100/$20,00 or |
||
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275Z41 |
300vdc |
250Anips |
$20.00 |
10/$175<OO |
1000/S150.00 |
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7-5754 |
300vdc 15KVDC |
400Ainps 20ina. |
$30,00 $3.00 |
10/$25O.OO 10/ $20,00 |
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HCD-iS |
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SKTRZOK |
20KVDC |
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IN 4 US |
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30/51,00 |
iOO/ $3.00 |
2708 1024x1 2716 2043x8 |
$2.00 each |
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FAIRCHILD |
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16K75 |
$4.00 each |
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25 For $25.00 |
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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 Terminal Cap. pf. 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
|
2tami |
$25.00 |
2SC3S78 $ |
2.00 |
mim % |
16.90 |
1GC1H21-3 |
SI 25. 00 |
|
2msez |
25.00 |
23C172& |
20,00 |
m&79 |
7.95 |
IBC1821-1J0 |
225.00 |
|
2msm |
25.00 |
2SL17B0 |
1.50 |
imm |
7.50 |
i6C2aoi |
40.00 |
|
2KS9a7 |
1.55 |
230909 |
4,00 |
uFvr:^ |
7.95 |
IGC2223-10 |
200.00 |
|
ZN2857JAK1X |
4,10 |
23C1946 |
36,00 |
llHB2;j |
9.95 |
nscaooo |
50.00 |
|
2Ce857JANTJCV |
4.10 |
2aCl^6A |
40.00 |
iE624 |
11 ^5 |
HSC3001 |
50.00 |
|
2N3S76 |
13.50 |
290.970 |
2.50 |
M9625 |
17,95 |
IISC73001 |
50.00 |
|
2N2917 |
18,36 |
2SC1974 |
4.00 |
B£^30 |
ia,oo |
W9e82001 |
40,00 |
|
2N294S |
13.00 |
astiyiee |
5.50 |
M9740 |
29. SO |
Mf*«^14 |
40.00 |
|
aN2949 |
1,^.50 |
23(.'"J237 |
32.00 |
Ma741 |
29.90 |
MSnft2020 |
40.00 |
|
2N3375 |
17,10 |
2SUd693 |
47.00 |
M9755 |
19.50 |
M9C83030 |
40.00 |
|
2Na^53 |
1.55 |
AS0^12 |
25,00 |
M^Sfto |
37.00 |
MSC83001 |
50.00 |
|
2N36:S2 |
15.50 |
mv^ |
10.00 |
143850 |
16,90 |
Sii«Cb3005 |
100. 00 |
|
2N3733 |
U.OO |
A2m |
5.00 |
MSSdl |
20.00 |
»mi50 |
14.40 |
|
2N:^ifi |
5.00 |
A2*^^H |
6.00 |
mm7 |
5.?Ji |
Iflbl26 |
POR |
|
2^*3866 |
1.30 |
AFioe |
2.30 |
W3W0B1 |
?.fV.CX> |
irr55y6/2iQ5g6 |
Sd.oo |
|
2M38eSJ«f |
2.20 |
AfYl2 |
2.50 |
1111550 |
10.00 |
in5768/2tl57B8 |
95.00 |
|
2.^^3924 |
3.35 |
Btjf/^ |
2.50 |
1111552 |
50.00 |
lfIB762 |
K*t |
|
2S3927 |
17.25 |
Bnei |
2.50 |
IH1553 |
50.00 |
IIBQ2136 |
2.50 |
|
230960 |
^.00 |
HM&Xl |
1.00 |
1111014 |
10.00 |
HE137S3 |
IW |
|
2mQm |
11.00 |
^^Sl |
1.65 |
Ilil0l3/2S*4O72 |
1.80 |
HE21B89 |
5,70 |
|
Tmo^i |
14.00 |
titwy9 |
2,50 |
5,00 |
liksvaas |
||
|
2mQ72 |
1.80 |
BfT12 |
2.50 |
lli337SA |
17.10 |
!ffi73436 |
2. SO |
|
2m(m |
4,53 |
BfTl6A |
2.50 |
1114429 |
10,00 |
IHI |
|
|
2N4127 |
21.00 |
BE117 |
2,50 |
unoDO |
1.15 |
I^B637 |
PCR |
|
3IH427 |
1.30 |
BE192 |
1.50 |
weooB |
2.30 |
iTiigo |
vm |
|
2N442S |
1.85 |
HFK44 |
2,50 |
MilOII |
25.00 |
rrjiM |
KJH |
|
^m3o |
11 80 |
Hrst4S |
2.90 |
MPFtoa |
.45 |
Pi-Jl95 |
FOR |
|
2N4057 |
3.45 |
^n^a^ |
2.50 |
MPSU31 |
1.01 |
PI3537 |
7.80 |
|
2»495® |
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.
ALL EQUlFfEMT CAiUtY A 30 OAY OUARAHfEE.
EOUlRfCifT 1% HOT CALlSllATEfi.
IZ5t]€.QD
fHOQ.QC
CXI-0 lerCHuM
CfwcK Ofwy
CQi9'' AccapuM* &f tilMipdvni or nwil PjiimiBnl ^jvt\ cwHorf^*!' wrti t* &» C^Mft, Monn Ordor, orCintmr * Qitck IHA iM« ccnrK?r Aocapl pvnOnvl chscki Im G O.D'K, C^.D.'« iW «hlpp«t J^r ^i' «ihv indthfij UntlnJ Pm««I S*/vlce
OONFINUINO Oni>E11B: Wi wOuld pitHsr EFUf aonrlfmlM OKl«n nnt dq senE aFltr • titophone orctaf hii bwn pl«oad, ir rjQtftptnf pcNcy iiacQGSitaleft ■ cj^rii^rmjng ^idcr. pb«iM mirk -"OElt^FinMlNO" boldly on tim imimj M pns^JMM W i^upltcalifi ainipnMMti. dc mr dUi IE) «i ofd« wNcn «• rrad pratwflr m***! »m cmftom* *iH to rwlU raipdmiloi* (or amr cMrgw iTcufred. plui ■ IftS fHlMi «l«ii^ on thp^ r«i4*rFMd |M4l»
30 DA-rS intf rytipt_^ «■
la
KUVIirV: Oretore nv uiusHy ttirwwJ ff» Mm* *»■ Wwy ■»• P<»™a of llw nurt »iAn«*l wy, wHMI •• w oiC pf bi™:* Df» w> llpn Thfl cuBromar *ii| I Cw fKiitl fiod by jx*! t*HJ I F w6 #K QOJnfl lo tip<*jjfdftr Itw ll«(tt, Qu* nonnil thtpdng mPtiiiad -In UPS w U B 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 W* ■ra wrry but CO D It noi nBilabU Id FCMHOn {soumdM ind IWlw* ol cn0lt nn wwcEflptBblfl u * l«mi Ot |iaynwi( Furtl^w^ intoffiHiiKm II wmtf^tJm on raquicl.
IriKU^UnaiLT. Mi
lllrit H rfS" I^M'
maw t9 jnur
fflftUBU
PARTS: Wb re^arv« Ihfl rigm lo BUbfilltutP or repl«cti any Heoi with a part of squal of comp^rsbJtt
sp^iflcaEian.
POSTAaE: Mtrrrmum mmppino snd rwndling in th« US.. Ciifiada. and Mtxico is $3.00 tor ground ship* mmn\t. a\f ott^i OMjnlrres ts &-S0 ALr ratas are ■nli«bi« at tliNe rima erf yofurordttr A)J (or«ign atdari plwfeM trKtude 2S% 04 Ui« ordwd wnOiad for stiip^ng, and nwnSiin^ CQ-D'i mtm shipped Am QNiV
FREPAIO
OKSarm muH ba KOOfncranMd by «
PftlCES: P^ces *m isMOJiKa lo
vvittiDul notic*
PUflCNASE Ofll^ERS^ VtJ« accept purcttasa ortkfi only wh«n thty ira acfiiQmpinJK} by a ctieck.
RESTOCK CHARGES: If parts are raiumed to MHZ EUCrrHONICS, iHC. due lo cutiomar »rrar, im CuAlomar win be iwirt r^sponslbfe for all teei Incurrftd and will M charged a 15% RESTOCK CHARGE with Iharamslnder In CREDIT ONLY, Th« followFog must afOOOmpanv any ratom; A copy of our Jnvcica raluiti aulhorlzatlon numbor i^hhch must bAObtainad prior to shipping Ihid m^cKandiaa CMCh. Rtturns (fiuit tm done wrtnin 10 DAYS of rwaJpt of psrceF. Raturn authorbxat'or^ numfaera can ba obtained by calling (BO^ 242-a9l6 or notltyiriQ ua l?y poai card. Riilurfi authod^lkKm Mill not ba Qivwi oiri on our SOO ruumber-
5ALES TAJt ARIZONA rUJdarrti mufti *dd B% $*im tu^ ijril«» a a^gnad ARIZPNA ruala taj card j««tfnntly on tHa wltti us. Alt orctar* diusadby panona nAsida o4 ARIZONA, btii dauiwad to par- ■oni In M20NA V suoiect to tn« S% salH tasL
SMORTAQE OR 0 AM AGE; AH daima for shortagM pr tiMmgBa muat be mad* wffhir^ 5 &AVS o* recwiri oi paTcti Ctams masi include a cow Of ft^ liwote*. aloriQ *iih a ratum authortz^iion nuffiber which can t* oblaiiwl toy contacting ue a1 (604) 242-89 ie ot s«f>d4iw a PO»t c*nJ AolbOf i?a llOOi caonol be on our 800 rturrifeftf. All IteilrtS itujsI be property pachid. ll llen>« are no! proparly paoikad make suc« to cohlact the carrier sto thai Ihoy can come oirl and Inspein Iba pacKaga belort [lit ralufn^ )o ua. Cijstomers which do not notary ua within this time period will ba bald rasponelbla fw tN entdfa orEtar ae vwa will consider ihfl onfar comp^ate.
Om? eOO NUMBER IS STRICTLY FOR ORD€RS 0<NLV (BDQ^ 52S4^dO, INFORMAtKM CALLS ARE TAKEN ON (002^ 242«gi6 or {60Zt 242.3037,
*^4e
2111 W. CAMELBACK ROAD PHOENIX, ARIZONA 6S015
^ AM parts rnay be new or surplus, and parts may be 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
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
■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*
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146 73 Magazine • April, 1984
Attenti on Moonbouncers
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"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."
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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-;
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The 1984 CALLBOOKS are iQad^^?^?^^ features for TsgncliBvvers iand QK| Order your copies novif^ $m-y^i:4 order directly f rom th^- pafeliiii^
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73 Magazine • April, 1984 149
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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.
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73 Magazine * April, 1984 155
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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!
|
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|
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-<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
|
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|
#^*^^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 |
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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 |
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CANAL ZONE |
14A |
J4 |
7A |
7 |
7 |
7 |
t4A |
:i |
21 |
2\A |
aiA |
21 |
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£M(^LA»|? |
7 |
7 |
7 |
7 |
7 |
7 |
14 |
14A |
L4A |
il |
14 |
14 |
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HAWAII |
21 |
U |
7E |
7B |
7B |
7 |
7 |
7 |
14 |
14A |
2\ |
^21A |
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INPtA |
lA |
7B |
7E |
711 |
7B |
76 |
14 |
14 |
14 |
14 |
]dt |
14 |
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JAPAN |
14a |
14 |
7E |
7B |
7R |
7B |
7 |
7 |
7 |
14 |
14 |
14A |
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MEKICO |
ii |
14 |
7A |
7 |
7 |
? |
7 |
14 |
14A |
21 |
ilA |
21 |
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PHILIPPINES |
lAA |
14 |
7B |
7S |
IB |
7E |
7B |
]4B |
14 |
J4 |
]4 |
14A |
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PliEHTO P4CC9 |
14A |
14 |
7 |
7 |
1 |
7 |
14 |
14A |
21 |
JlA |
£1 |
2] |
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SOUTH AFRICA |
14 |
7B |
7 |
7B |
7B |
U |
21 |
21 |
21A |
21A |
21 |
UA |
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U. S. S. R. |
7B |
7 |
7 |
7 |
7 |
7B |
14 |
14 |
14A |
14 |
14 |
7B |
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WEST COAST |
21 |
14A |
7A |
7 |
7 |
7 |
7 |
14 |
14a |
21 |
21A |
21A |
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.. ..-,.-. -^^.^- ^^ |
CENTRAL UNITED STATES TO;
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ALA&KA |
14 |
14 |
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7 7 |
7 |
7 |
7 |
14 |
14 |
14 |
14A |
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ARGENTINA |
11 |
14 |
14 |
ML |
7[1 |
7E |
li |
21 |
21A |
21A |
21A |
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AUSTRALIA |
ZlA |
14A |
14 |
7S! |
7ft |
7B |
7B |
14ft |
I4n |
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21 |
2 LA |
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CANAL ZONE |
SI |
14 |
7A |
7 |
7 |
7 |
14 |
14A |
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2U |
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eNOLAN-D |
7B |
7 |
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HAWAII |
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ZLA |
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INOIA |
14 |
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7B |
7E |
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7B |
7B |
14B' |
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.JA43AN |
14A |
14 |
S4B |
7B |
7B |
7B |
7 |
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MEXtCO |
14A |
14 |
7 |
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14 ' |
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FHILfPlflNEE |
I4A |
14 |
14b |
7B |
7B |
7B |
7B |
7 |
L4 |
14 |
14 |
14a |
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PUERTO RICO |
21 |
14 |
14 |
7 |
7 |
7 |
7A |
14A |
Zl |
2\A |
21 |
21 |
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SOUTH AFAICA |
14 |
7B |
7 |
7B |
7E |
7B |
14 |
Zl |
Z\ |
21A |
21 |
I4A |
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U.S.S, H- |
7B |
7 |
7 |
7 |
7 7B 1 |
7B |
14 |
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7B |
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WESTERN UNITED STATES TO: |
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ALASKA |
14 |
14 |
14 |
14 |
7 |
7 |
7 |
7 |
14 |
14 |
14 |
14A |
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ARGENTINA |
21 |
14A |
14 |
14 |
?B |
7R |
7P |
14A |
!1A |
^lA |
21A |
21 |
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AI^STRALIA |
21A |
lU |
21 |
14 |
14 |
14B |
7B |
14B |
14B |
14 |
21 |
21A |
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CANAL ZONE |
21 |
14 |
lA |
7 |
7 |
7 |
14 |
14A |
21 |
23a |
2iA |
2lA |
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HHGt-MiO |
7B |
7B |
7 |
7 |
7 |
7H |
7B |
7B |
14 |
14A |
14 |
14 |
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HAWAII |
21A |
Zl |
Zl |
14 |
14 |
7A |
7 |
7 |
14 |
21 |
21 |
21A |
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INDIA |
14 |
14A |
14 |
7B |
7B |
7B |
7B |
7B |
14 |
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14 |
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JAPAN |
21 |
lAA |
14 |
14B |
7Fi |
7 |
7 |
7 |
7 |
14 |
14 |
14A |
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[VtEXICO |
21 |
14 |
14 |
7 |
7 |
7 |
7 |
14 |
14 |
1\ |
21 |
21A |
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PHILIPPINES |
2] |
14A |
14 |
14B |
7B |
7B |
7B |
7 |
14 |
14 |
14 |
14A |
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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 |
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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
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YAESO WUt^ MJ.
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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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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.