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DireCiional RF Wallmeler Dielectric wattmeters are your best choice for making accurate RF measurements. These rugged, dependable wattmeters can discriminate between forward and reflected power in all types of 50 ohm coaxial transmission lines and RG type cables. In addition, they: • Measure from 100mW to 5kW • Have ± 5% full scale accuracy • Measure from 2MHz to IGHz • Have an easy-to-read 4V,' mirrored meter scale • Feature a taut-band meter movement for longer life • RF Elements available for all measurements The 1000-A from Dielectric - you can't buy an easier reading, more accurate RF wattmeter. A complete line of RF loads are also available. BASIC AUTO PATCH •Access, HDisable and adjustable Time r. COMPLETelY ASSEMBLED-$75.00. EXTENSIO N BOARD ~\ ~{ O Mk :r REPEATERS 144 or 220 MHz $849.95 \ ON BOARD VO LTAGE PROTECTIO N COR Identifier; All on one band, programmable, Fully ad ju stable, time ou t (.5-7 min.), ha ng time (0-1 mi n.), identifier (1· 10 min.) , tone , spe ed, vol um e, L.E.D. outputs, lo w current drain CMOS logic, pl ug s fo r easy ins tallation and remo val ptus much more. $99.95 COMP LETE LY ASS EMBLED Basic Rep ealer $649.95 COMPLETELY ASS EMBLED 2M 130·1 75 MH z Ba sic Repealer for 2 me ters with a ll the teatures of Ihe HI Pro Mkl less the power sup pl y and fro nt panel cont rols and eo cessone s. PA Res. add 6% lax PLUS SHIPPI NG Maggwre Electronic Laboratory 845 W ESTTOWN R D. WEST CHESTER, PA. 1938 0 P H ON E 2 1 5 4 3 6-6051 BARRY ELECTRONICS••• New York's largest and best-stocked dealer. Call the store with more! COLLINS KWM 380 . . . ta king orders DENTRON Clipperton L . . . call DRAK E TR-7IDR-7 transce iver R-7 Receiver . . . ca ll Yaesu FT-901D MFJ Comp let e line .. . ask J.W. MILL ER Daiwa CN-720 wattmeter/bridge Daiwa CS-401 RF coaxia l swit ch Yaesu CP-2500RK SWA N Astr a 150A . . . Barry has 'em TEMPO 81,2,5. .. in stock •.:\·.'!·.'!z :: ::q;~!HW!i~:iiJ:: :: ~.V.:·:,';::: r~:~~:~'I, '''\'/{,'f.W: DSI Frequ ency cou nters . . . in stoc k ENCOMM HT-1200 . . .we have them ICOM IC2AT hand-held with pad .. . in stock KEYS Ham Key . . . in stock NYE . . . in st ock Cubic Aslro 150A Icom IC-2A" MIRAGE·KLM ·TEMPO two-mete r amp lifiers .. . in sto ck ROBOT 800 and 400... in sto ck ROTORS Ham IV . . . spec ial. Call BARRY specializes in business band equipment. Yaesu FT- IOIZD TRIONYX TR-1000 frequ ency cou nte rs $159.95 YAESU FT-101ZD FT-107M FT-207R FT-227R B FT-707 CPU-2500RK All in st oc k . . .Call Ask about our amateur rad io licensing classes, NO VICE th rough EXTRA ! DIELECTRIC RAYMOND. MAINE 04071 .... 17 TEL. 207/655-4555 • 800/341-96 78 BARRY specializes in world wide export, licensing, packing and Shipping . BARRY stocks most m aj or brands . . . call or write. I • AQUI SE , HABLA ESPANOL • BARRY ELECTRONICS 512 Broadway, New York, N.Y. 10012 Telephone (212) 925-7000 » neeaer Service-see page 274 73 Magazine · October, 1980 233
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
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MEMORY KEYER BREAK THROUGHI New l
Page 29 and 30:
INTIMIDATED BY MORSECODE? THE NEWAE
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Solid-State H.F. Kilowatt Amplifier
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Escape from Mt. St. Helens! M arian
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dwarfed everything by its magnitu d
Page 38 and 39:
Edward t. M ulvin WBQI FF 34()()54t
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Phot o E. The AB C " That's Incredi
Page 42 and 43:
W erner M . Ma urer W1QMS Kefl y Dr
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MEMORY KEYER BREAKTHROUGHI The rema
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-WILSON SYSTEMS, INC.---.... the SY
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WILSON SYSTEMS TOWERS !i ~ ' ''0.0
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Joseph D. Novak K40VK 2420 Luckett
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Antenna azimuth for ATS·3 from Was
Page 54 and 55:
---SCR1000VHF-SCR4000UHF---- 7i?
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Joe wesrennaver W4FE:. C 155 Wood f
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f MEMORY KEYER BREAKTHROUGHl The re
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The Arcane Art of ATV the transvert
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Th e 2N2219 t ra nsistor specif ied
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Photo E. l eff WB8 RIY, about 5 mil
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Pho to G. Rack-mount installat io n
Page 68 and 69:
Robert B. Grove WA 4 PYQ Grove Ente
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proveme nt over the origina l To uc
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channe l l ; ente r 139.1 MHz into
Page 74 and 75:
detector. Be sure receiver is sw it
Page 76 and 77:
Joseph H. Cowen WA 5TUM P.O. Box 76
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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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TE1: ANTENNA SYSTEMS l-BoO-654 -}2}
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Robe rt M . Brown W9HBF 561 1 M idd
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c o u ra g i n g a n d wo r th repo
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elay (I used a 3PDT type) . When th
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'" '" 117 VAC NEON DIAL LITE .l 117
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Fig. 9. This view sho ws how the ra
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~ ''' ' '' '' '' -- sli de the cap
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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
Page 127 and 128:
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!
Page 145 and 146:
Two fuses are incl uded fo r safe t
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pu shed for th e switch to SSB and
Page 149 and 150:
October 1960 .. .....de W2NSD PI ,a
Page 152 and 153:
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
Page 160 and 161:
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
Page 168 and 169:
Jean Shepherd K20 RS Some Guys Make
Page 170 and 171:
1973 July .......····n~ 73's HA
Page 172 and 173:
1975 August 1: ~ '3~fr EOi TORJI'\.
Page 174 and 175:
~ ~ >. :; ....., co t" O) , f "i'
Page 176 and 177:
1978 August : :~~. Ir EOITOM'U8USHE
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1979 March ( UJoTOM'V 8USHEII W. ..
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manage o n 4o-mete r phone for the
Page 182 and 183: Fig. 3. Basic patte rn developed fr
Page 184 and 185: of-contac t are three: New England,
Page 186 and 187: 32 ' I " 3 2 '" 3 2 ' . " 3 2 ' I "
Page 188 and 189: Gilding the Lily - FT-101 mod for c
Page 190 and 191: Mike Mods for the KDK-2016A - impro
Page 192 and 193: Clock Blocks a compendium of TTL an
Page 194 and 195: ea BOOK CIIlOS I"lV ERT ER "0001 "
Page 196 and 197: 73 Magazine Staff Build a Better Ba
Page 198 and 199: TUfTS Electronic Department Store,.
Page 200 and 201: TUfTS Electronic Department Stor~"T
Page 206 and 207: TUfTS Electronic Department Stor~.T
Page 208: TUfTS Electronic Department Store,.
Page 211 and 212: t.a IO,. H r "001 ,j- ± " ~ cs r u
Page 213 and 214: and 5. The purpose of the divide-by
Page 215 and 216: 3500. To do this division by 3500,
Page 217 and 218: l i mi t er o utput on p i n twe lv
Page 219 and 220: Radio Amateurs! Tempo Handh
Page 221 and 222: 79. Late in 1975, as the JARL looke
Page 223 and 224: QRP ARCI ANNUAL OCTOB ER QSO PARTY
Page 225 and 226: ("----~) FUNl from page 28 5) The "
Page 227 and 228: you need a friend w ho works fo r M
Page 229 and 230: held, and the Georgia State CW Asso
Page 231: FREE! RADIO AMATEURS WORLD ATLAS wi
Page 235 and 236: control of an amateur radio station
Page 237 and 238: SatelliteT~ FORTHE HOME Sick of Net
Page 239 and 240: schematics, formulas, construction
Page 241 and 242: Th e Comm issio n s tated , " Lo ok
Page 243 and 244: MFJ RECEIVER ANTENNA TUNER/PREAMPLI
Page 245 and 246: c lasses are proving that it is pos
Page 247 and 248: 74l SIllITTL IUSooN l4lS0 2N " l50'
Page 249 and 250: NO BULL SHi", • Over the past thi
Page 251 and 252: 7294 N .W. 54 STREET MIAMi. FLORIDA
Page 253 and 254: • linear Converters for SS B, CW,
Page 255 and 256: L.. ....J ...... 28 22 North 32nd S
Page 257 and 258: ATTENTION IC·2AOWNERS: IC-2ATONE D
Page 259 and 260: smsat !!!ill. CP'O -.4,,...a_ " N '
Page 261 and 262: BLAK-RAY Ultraviolet Intensity Mete
Page 263 and 264: PROUDLY PRESENTS the GLOBAL SPECIAL
Page 265 and 266: TOLL FREE # (800) 528·0180 (for or
Page 267 and 268: MICROWAVE COMPONENTS COMPUTER I.C.
Page 269 and 270: • NOV ICE STUDY GUIDE-SG7357-Here
Page 271 and 272: = = === = TEST E QUIPMENT =====:::;
Page 273 and 274: EALER PROPAGATION San Jose CA Bay a
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