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Fig. 3. Basic patte rn developed from all Q50s mad e. Wh ile the patt ern shows clear east/wes t orienta tion, the antenna is physically located running in the same direction, suggesting end-fire performance. Fig. 4. A close-up look within the basic patte rn (Fig. 3) showing the shape and path of most extrao rdinary results. over again. Thi s ha s t he dec id ed adva ntage of cl eari ng t he freque ncy coa st-to-coast because it doesn't tak e long f or people to reali ze that I am serio us about respon d in g to ev eryone w ho ca lls, and t hey realize t hey w ill not have long to w ait. Can you im agin e how m u ch fu n 40-meter Gene ral p ho ne nighttim e ham m ing c an be under t h is k ind o f cl ear-fr eq u en cy cond it io n? W ell , it is downr ig ht n ifty. For exa m ple. it is enti rely p ossibl e to p ic k out sta t io ns w hich wou ld not ordina ril y b e heard beca use of Q RM. Seldom does an evening go by w he n I'm not hearing f rom a remote Cana d ian w ay up th er e m any hundred s of miles d ist ant, from t he Ca na l Zone o r other Central American regio n, o r from Berm uda (V P9). But t he m o st fun is sim p ly see- 182 73 Magazine· Oct obe r, 1980 ing ho w many pe ople are hearing m e and c an be w o rked stat eside. A t y pi cal ev e n i n g w i l l p rod u c e dozens o f contacts fro m a ll over t he U S. A nd they all tell m e about the same t hing. W hat Peo pl e Say A bout th e Signal The pl au dits th is antenna p ro duces in Q SO s are f asci nating: • " Yo u' re ab solute ly t he st ro ngest signa l I've heard on t he b and t his eveni ng ." • " I've been li ste ning to you for t he l ast hou r and just had to give you a call to tell you how well I'm copying you here." • " Yo u are w ithout a d oubt t he st ro ngest signal w e've ev e r h ea rd f ro m t he Chicago area." • " Yo u are li terall y t he st ro ngest signa l ev er co p ied o n t h i s r e c e i v e r . T h e 5-m eter is ru nning bet we en 35 an d 40 d B o ver 9; p revi ously, it 's never gone higher t han 20 over." • " W hat are you ru nn ing f o r an an tenna? You are p low ing in here way above t he foreign broadcast QR M , st ro ng an d steady. Hard ly any QS B at all." T he av erage 5- m e t e r reading I get is 20 d B over 59. W hile I f u ll y reali ze th at S-meter reading s ca n be somewhat m eanin gl ess, t he poi nt is th at peo p le c all me becau se I am Q5 co p y and w a y a b o v e th e s i g n a l st ren g t h of m o st o ther sig na ls th ey are hearing. Often, I will sw i t c h anten nas o ver to see t he d ifference s on tran sm it. The three I usu ally sw itch betw een are (a) t his array, (bl t he dou b le-extended zepp, and (c) th e ro o f-m ount ed ground p lane. In all cases, t he report s I get d ir ect ly co rroborate t he ga in f ind ings c it ed ea rl ier in t hi s art i c le: 15 d B ov er t he gro und pl ane and 6 d B over th e zepp. In so m e ca ses, I get a l lHJ B ga in reading over the ze p p, bu t that is probab ly due to t he rather d irec t ive c h a ra c te ri st i cs o f th a t anten na. W h ic h br ings u p an in terest in g point: W hat . about the pattern t his arra y ge ne rates? Pattern Ob se rvati ons This thing at f irst appeara nce seem s to gene rate a so m ew h a t o m n id irect ional pattern . In no way does it p roduce th e nor t h ea st/southwest ma jor lo bes that it d id w hen function ing o ri gi na ll y as a 7 5 ~m e te r array. 50 u nch aract eri st ic is t his antenna 's performance th at I t houg ht an interest ing way t o t rac k it s lo be s wou ld be simply to make log no t a t io ns of sig na l stren gth fro m sta t io ns cont acted and see w h at th i s p rodu ced . I r e c or d e d the s i g nal st r e n g t hs o f sta t i o ns w o rked and t hen t ab u lated t hem. For c harting pu r- T hese are st ingy receiveo nly rea d ing s. The signal reports I was getting were gen erally 10-25 d B stronge r t ha n t hose give n. This is probab l y due to Kenw o od s t ic k i ng w i t h a 5 0 m icr o vo lt s = 59 spec on t he orig inal T5-520. But in any case , t his data show s a cl ear patte rn of m aximum ope ration, and it d ef in itel y is not to t he w est. Fig. 2 sho ws t hat the pec u li ar l o bes prod uc ing t he m o st gain v s frequen cyposes, I drew u p a sca le run ning f rom 1 throug h 19. Eac h po in t represented a si g nal st re n g t h re a d ing r e c o r d ed in t h e l o g . N u m be r 1 rep resented 56,2 w as 56 '1\, 3 w as 57, and so on up to 19 which w as 22 d B o ver 59. On the o t her axis of the c hart w ere states o rganized in t o n in e re gions: N ew Engl and , A t la ntic, Sou t h eas te rn seaboard coastal, So uth , Mid -A t la n ti c, M id we st, So u thwes t, West. and W est Coast. (See Fig. 2.) O nly co ntac ts mad e at the same t im e of th e ev e n ing w ere c harted . A lso, only t hose ident ifyi ng station li ne-u p and ante nna were reco rd ed , and o nly t ho se u sing b arefoot r igs and either an in verted V or conventi o na l d ip ol e were incl ud ed in t he c hart ing effort , Charti ng wa s done on 285 co ntacts in 41 states, an av erag e of 7 contacts pe r st ate. As sho w n in Fig. 2, most co nt acts we re in t he A t l ant ic regio n, and t he fewest w ere in New England . Evaluation of Signal Reports A m uch m o re t e ll in g find ing ca n be deduced f ro m an examinatio n o f t he signal reports. T hese we re done state-by-st ate w it hin regions, av eraged, and t he n show n as a state av er age. The y th en were averaged f or t he regi on as a w hole. Th e resu lts are shown in Fig. 2.
ASTRON POWER SUPPLIES • HEAVY DUTY . HIGH QUALITY • RUGG ED • RELIABLE • SPECIAL FEATURES • SOLIDSlATE ELECTRONICAllY REGULATED • FO l D~aACK CURRENT LIMITING Protects Power Supply from excessive current & conlinuous shorted outp,«. • CROWBAR OVERVOLTAGE PROTECTIONon Models R S~ 7A . R5-12A, RS-lOA, RS-35A. RS-2OM & RS-35M • MAINTAIN REGULATION & l OWRIPPLEat low line input Voltage. • HEAVY DUTY HEAT SINK. CHASSIS MOUNT FUSE • THREE CONDUCTOAPOWERCOAD • ONE YEAR WARRANTY. MADEINU.S.A • VOLT & AMPMETERON MODELS RS-2OM & RS-35M PERFORMANCE SPECIFICATIONS Continuous ICS· Size(in.) Shipping Model Duty(amps) (amps) HXWXD WI. (lbs.) Price RS-35M 15 35 5X 11 X 11 '9 $167.95 RS-35A 15 35 5X 11 X 11 ' 9 $149.95 RS-20A 16 10 5X 9X 10Vl 10 199.95 RS- 12A 9 11 4Yl X8 X9 13 $74.95 RS-7A 5 7 3% X6% X9 8 $54.95 RS-4A 3 4 3 314X6 YlX 9 5 13995 ·ICS - Intermittent Commu nication Service (50%Duty Cyc le) II nol available atyour tocal dealer. please contact usdirectly. _ - ..7 . - .e~_ :--':.a :.. ASTRON 20 AMP RE GULATED PO WE RSUPPLYMod elRS-10M • INPUT VOLTAGE: 105 - 125 VAG 16Amps continuous • OUTPUT VO LTAGE: 13.6 vae to_OS volts 20Amps IGS' (Internally Adjustable: 11-15 VOel S" (H) x 9"(W) x l OS (0) • RIPPLE: l ess than 5mv peak to peak (l ull load & low line) Shipping Weighl 20 ItIS_ • REGULATI ON : ~ . 05 volts no load to lull load &. low line to high line Price .. . $117.95 Other populu POWERSUPPLIES 1110 available: ISame teewe s andspecrtcanonsas above) Inside View - 1971 South Rit chey Street Santa Ana. CA92705 (7 141835-0682 v350 RS-12A AEA MorseMatic in stock now at AES The MorseMatic - one01the finest Morse kerersever built It tee tcres something 101 everyone whether a beginner, CWenthusiast.contester orseriousVHF Ox"er Functions asamemory keyer. Morsetrainer,bea con.or automatic seria l number sequencer, Operates with all popular paddles. Keys grid block. cathode or transistor circuits. Ope rates 011 of external 9 to 16 1I01ls DC. MM -I MorseMat ic Programmable kever ..... $199.95 ME-I 2000 char. memory expansion - MM·l . . 59.95 AC-I 600 rna. AC adaptor for MM ·1 & ME-I 14.95 MK-l non-message 2·99 WPMkeyer _ 79.95 AC-2 350ma. AC adaptor for MM-l & MK-l.. 9.95 mh er popular AEA pr oduct s: AD-I, AD-I/UV·3. AD-I / ICOM Autodialer . $129.95 Magicom RFspeech processor for T·4XC ••••. .. 52.50 Magicom RFspeechorcc. for TS·520/S. TR·7.. 42.50 Magicom RFspeech oroc. module . TS·820/S . . 27.50 ISOPOLE 1442 meter base stanon antenna 49.95 ISOP OLE 220 220 Mhz base station antenna 44.95 ...- • _ P'1i!~ ~ AMATEUR ELECTRONIC SUPPLY® 4828 W. Fond du Lac Avenue Milwaukee. Wisconsin 53216 Phone: (414)442-4200 Wisconsin WATS: 1-800-242-5195 Nationwide WATS: 1-800-558-0411 IMPORTA NTI The follOWing Branch and " SOClale Stores are set-up for W"lK·INor TElEP HONE busmess only Thef do not haveIacrhnestorespond10wrrl1en Inqumes. etc. Please direct all mall 10 the Mil"a ukee addren shown above. BRANCH STORES WI CKLIFFE . OH 44091; 28940 Eucli d Avenue Phone: (216) 585-7388 Ohio in-stat. WATS: 1-800-362-0190 ORt ANDO_Fl 32803; 621Commonwealth Av. _ Ph one: (305) 894-3238 Florida in-state WATS: 1-800-432-9424 LASVEGAS. NV 89106; 1071 Rancho Roa d Phone: (702) 647-3114 Ou tside Nevada WATS: 1-800-634-6117 AES STORE HOURS: (except Las Vegas) Mon. Tues. Wed & Thurs 9-5'30: Fr; 9-8: 5a t 9-3 ASSOCIATE STORE ERIC KSON COMMUN ICATIONS, INC_ CHICAGO, IL 60630 5456 N. Milwauk. o Ave. Phone: (312) 631-5181 Outside lIIini os WATS: 1-800-621-5801 " Reader Service- see page 274 73 Magaz;ne • October, 1980 183
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Ii Gift to , enty Years of 73 o 174
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Rack Attack from DenTron Components
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Escape from Mt. St. Hel e ns! .....
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Small wonder. TRIO-KENWOOD COMMUNIC
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Afresh idea! Our new cro p of to ne
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All new, all nine hf bands and only
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1. SENSITIVITY: Superb amp lif ier
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Touch-Tone Decoders . SJ.' ·_ M·
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WHEN OUR CUSTOMERSTALK•.• WE LI
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STOP RF SPILLOVEI You may be losing
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( LEAKY LINES Dave Mann K2AGZ 3 Dan
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73's ICOM IC·720 DEAR OM: There ar
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MEMORY KEYER BREAK THROUGHI New l
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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
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Edward t. M ulvin WBQI FF 34()()54t
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Phot o E. The AB C " That's Incredi
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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
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---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
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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
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detector. Be sure receiver is sw it
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Joseph H. Cowen WA 5TUM P.O. Box 76
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an advance piece and aft erthe-fac
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School and ret ired surgeon Dr. N i
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73 Magazine Staff Field Strength fo
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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
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upts but often gets in the last wor
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signals. It decides tra nsm itter o
Page 131 and 132: .... Reader SelVice- see page 274 7
Page 133 and 134: IIEW IIIFFEIEIiT FROM BARKER & WILL
Page 135 and 136: Have you ever wondered why the best
Page 137 and 138: P ~ESCA l£ I NPUT C2 C1 I~ ;;-----
Page 139 and 140: A 40-pin socket must be used for th
Page 141 and 142: un til it changed tone and wo und d
Page 143 and 144: MF.J 941C Versa Tuner II , i i 11f!
Page 145 and 146: Two fuses are incl uded fo r safe t
Page 147 and 148: 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¥
Page 154 and 155: 73 1964 January INCENTIVE LICENSING
Page 156 and 157: John W . CampbeJl W2ZCU How To Be A
Page 158 and 159: would simply melt the m selves in
Page 160 and 161: 73 1966 Oc tober de W2NSD/l de W 2N
Page 162 and 163: 162 73 Magazine . Oct ober, 1980 19
Page 164 and 165: 1969 October ...de W2NSD/l rr ay ne
Page 166 and 167: 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
Page 178 and 179: 1979 March ( UJoTOM'V 8USHEII W. ..
Page 180 and 181: manage o n 4o-mete r phone for the
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 and 232: 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
Page 241 and 242:
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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EALER PROPAGATION San Jose CA Bay a
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