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detector. Be sure receiver is sw itched o ff before beginni ng th is modifica tion! Part G is not recommended unless AM detec tion is o f paramou nt impo rtan ce. I assume no respon sibility for damage resul ting from this modi fication! • Mo un t a n SPST switc h conveni ent ly f o r use. • Con nect one lead fr om t he sw it c h t o c hass is ground . • Conne ct other sw it c h lead through a 10-0 hm resisto r to pin 9 of IC301. Make certain that yo u have correct ly ide ntified pin 9. M easu re vo l t age w ith a VOM to double-ch eck th at there is no signif ica nt vo ltage present which could damage t he IC by grounding the pin. Be extre me ly ca reful while so ldering; the IC paths a re ve ry close togethe r, a nd the IC is easily destroyed by accide nta l vo ltages o n th e w ro ng pins. I know fro m sad exp eri ence ! The K1 00 The Kl00 offers considera b le i m p r o v em e n t o ve r the ea r l ier To uc h. Mo st o f the sho rtc omings of it s pred ec esso r have bee n co rrect ed, a nd th e genera l alignm en t recommen d a t io ns listed be lo w a pply equally well to its bigger brothe r, t he K500. No tests w ere perform ed on th e new M100, but it ma y be assum ed that the procedure wo uld be simila r. To program t he Kl00 beyon d it s advert ised f req uency ranges, press th e decimal ke y before e ntering t he d esired frequ e nc y. Algorith m ra nges d isplayed a re approximately 10.19-92.10, 131.1-213.015, a nd 372.737 576.875 MHz. By ca reful rea lignme nt, t he following ranges w ere actuall y rece ivable in our test unit (vco slug inse rted): 15.2-53.8, 136.1-1 74.7, an d 387.0-502.5 MHz; (vco slug re mo ved) : 20 .65 -66.1 4, 1 41 .56-187.0, a nd 403.2-539.6 MHz. The Photo D. The M 100, newest in the Regen cy line, fea tur es straight fo rward, co mpa ct design. vc o co il is located und er the top shie lded com pa rtme nt, towa rd t he front of the cabinet. Aft e r sett ing th e vco slug so tha t the squelch bre a ks at the desired upper a nd low er li mi ts o n eac h band , proceed with the rf alignm ent. Rf Alignme nt • Monito ring a w eak signal f ro m a signal generator set to approximately 45 MHz, peak the two coi ls located und e r t he fu se fo r best quieting (m axim um signal stre ngth). • Mo nito r a signa l near 165 MHz a nd peak the three co ils in a line loc ated near the a ntenna jack . Peak ad ja cent trim po t near 150 M Hz . Altern a tively, t he t rimpot may be peaked nea r 147 M Hz for best 2-me te r rec eption (Note : High-ba nd t rac king is o nly about 6 M Hz w ide, facto ry set fo r 155-163 MHz, approximat ely.) • Loc ate th e two trimm er capacitors ad jacent to the o pen 1-turn coils. These are the U HF trim me rs. Tune in a weak signal near eithe r 470 or 492 MHz (whichever is m or e act ive in your locatio n). Peak the two tr im me r ca pacitors for best q uieting. Locate th e shielded trimmer ca pacit or and pea k it for best signal near the minimum capacit ance sett ing. Peak th e ad jace nt trimpot near 420 MHz. The a lignme nt ste ps sho uld be repeat ed until no improvem ent is noted . AM Detection for the Kl 00 Ag ain, as point ed out with the Touch AM modificat io n, this f eature is only mode rate ly success ful, bu t if se lectable AM is vita l, it will work in a p inch . Co nnec t a n SPST switc h in series w ith any conveni ent capac it ance of fr o m .01 to 1 mic rof a rad betwee n pins 3 a nd 5 of IC301, t he i-f c h ip. Wh e n t he switch is closed, AM will be detected . The K500 As received from the f act o ry, o ne sa m p le K500 showed the following algorithm read o u ts:1 9 .60 0 60 .555 , 1 35.100-1 76 .055, a nd 371.6875-576.47 5 MHz. The ac tua l exte nde d ranges whic h wo uld break sq uelch as f act or y ad justed w ere: 19.600-570, 137.60-176.055, a nd 388.1875-513.025 MHz. These ranges m ay be improved by the sa me type of alignment p rocedure as o utlined fo r the Kl00. Con clusio n It must be po inted out that these are experime nt al m o d ifi c at ions ' o n ly and worked with the pa rticu lar sam ples of Regen cy scanners ava ila ble at th e time the improvem ents w ere attem pted. I can assum e no respo nsib ility for the projec ts of readers nor for d amage whic h may resul t to circuitry! It wo uld be a good idea to obtain a factory service m anual to ve rify the proced u res o ut li ned abov e, a nd for ideas regar din g additio na l modificat ions lat-, er. The exp eriment al proc e d ures suggested in th is a rticle will allow a listener s ligh tl y mor e re cepti on flexibility t ha n ori ginally possible w it h the facto ry issued sc an ner s. If any reade rs co me up with add i tional field modifica tion s (such as an S-meter ci rcu it operated fro m the aud io sque lch bu s), Iwould like to hear abou t them! . 74 73 Mag azine. Octo ber , 1980
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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
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 46 and 47: -WILSON SYSTEMS, INC.---.... the SY
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
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
Page 86 and 87: TE1: ANTENNA SYSTEMS l-BoO-654 -}2}
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
Page 94 and 95: '" '" 117 VAC NEON DIAL LITE .l 117
Page 96 and 97: Fig. 9. This view sho ws how the ra
Page 98 and 99: ~ ''' ' '' '' '' -- sli de the cap
Page 100 and 101: "' 0." -t ee' I CONNECTOR~ TO IlR M
Page 102 and 103: 1'::1" ~~4 ""ATTENTION MOBILE HAMS
Page 104 and 105: Patrick M cGuire W BSHGR 102 Dunca
Page 106 and 107: SECURE THIS END TO BOT TO M PL ATE
Page 108 and 109: Then buy a small can of red spray e
Page 110 and 111: Description a) Print frame (same as
Page 112 and 113: MEMORY KEYER BREAKTHROUGHI The rema
Page 114 and 115: INTIMIDATED BY MORSE CODE? THE NEW
Page 116: RTTY Demodulators ~~;~~ e $449. 00
Page 119 and 120: BUU Directlromthe Tri·EK@ Factoru
Page 121 and 122: • CALL 1 N8AD 2 KB8/>J'1 l WAlDCS
Page 123 and 124: • •• 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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~ ~ >. :; ....., co t" O) , f "i'
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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
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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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t.a IO,. H r "001 ,j- ± " ~ cs r u
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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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• 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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= = === = TEST E QUIPMENT =====:::;
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EALER PROPAGATION San Jose CA Bay a
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