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-WILSON SYSTEMS, INC.---.... the SYSTEM 36 CALL FACTORY DIRECT 1-800-634-6898 A trap loaded antenna that performs like a monobander! That's the characteristic of this six element three band beam. Through the use of wide spacing and interlacing of elements, the following is possible: three active elements on 20, three active elements on 15, and four active elements on 10 meters. No need to run separate coax feed lines for each band , as the bandswitching is automatically made via the High -Q Wilson traps. Designed to handle the maximum legal power, the trap s are capped at each end to provid e a wea ther-proof seal against rain and dust. The special High-Q traps are the strongest available in th e industry today. ::_ g511 SWR CURVES ~::: - ... ... 'u .... ,. . . "" •• ,.> >0. ",• •n .m.. ..: _ .... :
WILSON SYSTEMS, INC. PRESENTS THE SYSTEM 40 TRIBANDER 3 MONOBAND ANTENNAS IN ONE - EACH WITH FULL MONOBAND PERFORMANCE FACTORY DIRECT ONLY .374 811 A NEW CONCEPT IN ANTENNA DESIGN USING A 26 FT. BOOM • FOR THE SERIOUS DXer WHO WANTS MONOBANDERS ON 10-15-20 • FOUR FULL SIZE 20 MTR ELEMENTS WITH 10 dbd GAIN & 25 db FIB • FOUR WIDE SPACED 15 MTR ELEMENTS WITH 10 dbd GAIN & 20 db FIB • FIVE W IDE SPACED 10 MTR ELEMENTS WITH 11 .5 dbd GAIN & 20 db FIB • ONLY ONE FEED LINE REQUIRED • HEAVY DUTY BALUN INCLUDED • DESIGNED WITH NO INTERACTIONS BETWEEN ELEMENTS • ALL DRIVEN ELEMENTS AND DIRECTOR ELEMENTS ARE INSULATED FROM BOOM • SAME QUALITY HARDWARE AS USED IN ALL WILSON ANTENNAS - SPECIFICATlONS- IU 141 IU '" 141 AVAILABLE ONLY FACTORY DI RECT CALL 4286 S. Polaris Ave ., las Vegas, Nevada 89103 1·800·634-6898 ~~~~ PRICES AND SPECIACATIONSSUBJECT TO CHANGE WITHOUT NOTICE. 1" ' 101 11.1 '" '" l U n .•
Page 1 and 2: Ii Gift to , enty Years of 73 o 174
Page 3 and 4: Rack Attack from DenTron Components
Page 5 and 6: Escape from Mt. St. Hel e ns! .....
Page 7 and 8: Small wonder. TRIO-KENWOOD COMMUNIC
Page 11 and 12: Afresh idea! Our new cro p of to ne
Page 13 and 14: All new, all nine hf bands and only
Page 15 and 16: 1. SENSITIVITY: Superb amp lif ier
Page 17 and 18: Touch-Tone Decoders . SJ.' ·_ M·
Page 19 and 20: WHEN OUR CUSTOMERSTALK•.• WE LI
Page 21 and 22: STOP RF SPILLOVEI You may be losing
Page 23 and 24: ( LEAKY LINES Dave Mann K2AGZ 3 Dan
Page 25 and 26: 73's ICOM IC·720 DEAR OM: There ar
Page 27 and 28: MEMORY KEYER BREAK THROUGHI New l
Page 29 and 30: INTIMIDATED BY MORSECODE? THE NEWAE
Page 31 and 32: Solid-State H.F. Kilowatt Amplifier
Page 34 and 35: Escape from Mt. St. Helens! M arian
Page 36 and 37: dwarfed everything by its magnitu d
Page 38 and 39: Edward t. M ulvin WBQI FF 34()()54t
Page 40 and 41: Phot o E. The AB C " That's Incredi
Page 42 and 43: W erner M . Ma urer W1QMS Kefl y Dr
Page 44 and 45: MEMORY KEYER BREAKTHROUGHI The rema
Page 48 and 49: WILSON SYSTEMS TOWERS !i ~ ' ''0.0
Page 50 and 51: Joseph D. Novak K40VK 2420 Luckett
Page 52 and 53: Antenna azimuth for ATS·3 from Was
Page 54 and 55: ---SCR1000VHF-SCR4000UHF---- 7i?
Page 56 and 57: Joe wesrennaver W4FE:. C 155 Wood f
Page 58 and 59: f MEMORY KEYER BREAKTHROUGHl The re
Page 60 and 61: The Arcane Art of ATV the transvert
Page 62 and 63: Th e 2N2219 t ra nsistor specif ied
Page 64 and 65: Photo E. l eff WB8 RIY, about 5 mil
Page 66 and 67: Pho to G. Rack-mount installat io n
Page 68 and 69: Robert B. Grove WA 4 PYQ Grove Ente
Page 70 and 71: proveme nt over the origina l To uc
Page 72 and 73: channe l l ; ente r 139.1 MHz into
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Page 76 and 77: Joseph H. Cowen WA 5TUM P.O. Box 76
Page 78 and 79: an advance piece and aft erthe-fac
Page 80 and 81: School and ret ired surgeon Dr. N i
Page 82 and 83: 73 Magazine Staff Field Strength fo
Page 84 and 85: Photo B. Front of th e con verted Y
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Page 88 and 89: Robe rt M . Brown W9HBF 561 1 M idd
Page 90 and 91: c o u ra g i n g a n d wo r th repo
Page 92 and 93: elay (I used a 3PDT type) . When th
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Fig. 9. This view sho ws how the ra
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"' 0." -t ee' I CONNECTOR~ TO IlR M
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1'::1" ~~4 ""ATTENTION MOBILE HAMS
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Patrick M cGuire W BSHGR 102 Dunca
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SECURE THIS END TO BOT TO M PL ATE
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Then buy a small can of red spray e
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Description a) Print frame (same as
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MEMORY KEYER BREAKTHROUGHI The rema
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INTIMIDATED BY MORSE CODE? THE NEW
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RTTY Demodulators ~~;~~ e $449. 00
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BUU Directlromthe Tri·EK@ Factoru
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• CALL 1 N8AD 2 KB8/>J'1 l WAlDCS
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• •• Computerize your log boo
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is sim p lif ied and refined t o al
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upts but often gets in the last wor
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signals. It decides tra nsm itter o
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.... Reader SelVice- see page 274 7
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IIEW IIIFFEIEIiT FROM BARKER & WILL
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Have you ever wondered why the best
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P ~ESCA l£ I NPUT C2 C1 I~ ;;-----
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A 40-pin socket must be used for th
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un til it changed tone and wo und d
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MF.J 941C Versa Tuner II , i i 11f!
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Two fuses are incl uded fo r safe t
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pu shed for th e switch to SSB and
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October 1960 .. .....de W2NSD PI ,a
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A M ATEUR RADIO 73 6' YIO carRad¥
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73 1964 January INCENTIVE LICENSING
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John W . CampbeJl W2ZCU How To Be A
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would simply melt the m selves in
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73 1966 Oc tober de W2NSD/l de W 2N
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162 73 Magazine . Oct ober, 1980 19
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1969 October ...de W2NSD/l rr ay ne
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1971 Decem ber Mean ingf ul Conu cu
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Jean Shepherd K20 RS Some Guys Make
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1973 July .......····n~ 73's HA
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1975 August 1: ~ '3~fr EOi TORJI'\.
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1979 March ( UJoTOM'V 8USHEII W. ..
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manage o n 4o-mete r phone for the
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Fig. 3. Basic patte rn developed fr
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of-contac t are three: New England,
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32 ' I " 3 2 '" 3 2 ' . " 3 2 ' I "
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Gilding the Lily - FT-101 mod for c
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Mike Mods for the KDK-2016A - impro
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Clock Blocks a compendium of TTL an
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ea BOOK CIIlOS I"lV ERT ER "0001 "
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73 Magazine Staff Build a Better Ba
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TUfTS Electronic Department Store,.
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TUfTS Electronic Department Stor~"T
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TUfTS Electronic Department Stor~.T
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and 5. The purpose of the divide-by
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3500. To do this division by 3500,
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l i mi t er o utput on p i n twe lv
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Radio Amateurs! Tempo Handh
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79. Late in 1975, as the JARL looke
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QRP ARCI ANNUAL OCTOB ER QSO PARTY
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("----~) FUNl from page 28 5) The "
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you need a friend w ho works fo r M
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held, and the Georgia State CW Asso
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FREE! RADIO AMATEURS WORLD ATLAS wi
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DireCiional RF Wallmeler Dielectric
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control of an amateur radio station
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SatelliteT~ FORTHE HOME Sick of Net
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schematics, formulas, construction
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Th e Comm issio n s tated , " Lo ok
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MFJ RECEIVER ANTENNA TUNER/PREAMPLI
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c lasses are proving that it is pos
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74l SIllITTL IUSooN l4lS0 2N " l50'
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NO BULL SHi", • Over the past thi
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7294 N .W. 54 STREET MIAMi. FLORIDA
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• linear Converters for SS B, CW,
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L.. ....J ...... 28 22 North 32nd S
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ATTENTION IC·2AOWNERS: IC-2ATONE D
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smsat !!!ill. CP'O -.4,,...a_ " N '
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BLAK-RAY Ultraviolet Intensity Mete
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PROUDLY PRESENTS the GLOBAL SPECIAL
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TOLL FREE # (800) 528·0180 (for or
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MICROWAVE COMPONENTS COMPUTER I.C.
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• NOV ICE STUDY GUIDE-SG7357-Here
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= = === = TEST E QUIPMENT =====:::;
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EALER PROPAGATION San Jose CA Bay a
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