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• • unl err $12,000,000 Scanner Sale Uniden Corporation 01 America has purchased the consumer products line of RegencY Electronics Inc. for $12,000,000. To celebrate this purchase, we're having our largest scanner sale In history! Use the coupon in th is ad for big savi ngs. Hurry...cHer ends September 30, 1989. ***",ONEYSAV'HOCOUPON*** Gtlt ~, ...."gl on 'h' sea",..,. listedin Ihi. C:OUpeln. Tlli. COUpOn mu" e. inc:/u"-d ",ifh 'fOIl' ~id Older. CtediJ cards, ~1eh«:Jeld. t here ia no bener Citllens Band radio on l he markel loday. PRQ310E·T Un_.a CI'I. Portabiel'Mobi.. ce.. 183.115 PA033OE·T Un/d8rl.a CI'I. Remote mount ce... 110T U_n Cordle.. P!'Iona.•........ , 569 95 *** ~'.mI.d••nlc. Con',.ct *** N you PUtC"'" a Kanner. Ce. radar del«for or cordi... ~from • ...,.'ore on II>e U.S,or Canada...lh,n11\8lui30 dar&. \'OIl can ga{ UP 10 Inree yeelll 01 a.I__ICe QOntraoet tn)t'II W.......,ecn. rn.a Mf\'io8 • •1_pi.., beg.... an., Ihe manufacturer . ......nty • •po.... W. rr. nlacn N pert""" ell nec 'Y tabor .nd w~ 1 fIOl cnaroa lor .elum ahippi"O, E. I.nCl8d ic. conlr.ct..... nolretundable and aootyonly10 Ih. ongonal purchaMr. A lWOy....."'""ded COft" l lllet ona mOOil" or bilM ocanne, i.$29,99 and lnr." ~e. ' s ia 539,99, For nandheld ICInne'" 2 yealll " 159,99 and 3 yea..is 5111,89, Fo, 'a".rd. tecto... IwO yU ill i.S29, 99, f o, ca'.dioa, 2 yealll i, $39,99. Fo. cordle.. pnon• • .3 yea'al, $34.99, O'der yo~' e.l.nded ••rvlc. eonl racl IOOsy, OTHER RADIOS AND ACCESSORIES BC55XlT·T S. are. t 10 enl nnel ac.nn $ 1I 4.95 BCTOXl T·T S••relt 20 enennel &C.nner, I I 59,95 BC115IlLT·T Sure.l 16 en.nn" ac.nner , 1156,95 R2oeD- T R8I1. "c, 60 enannal acann.r $ 149,95 TS2·T ",.,."e, 75 ch. nn" aca"ne' 1269,95 UC102·T R-v8llq VHF 2 c/'l. 1 W. ltI,..,ec_ .. 1114.9S BP$5-T "'8ll'lfle, 16 amp reo. pooo. aU(l9ly 1119,95 BP20S-T Ni--Ced billlpad< lor BC2OOl BClllOXLT .. ,...995 8&T 12 V M N..cad bIIlt_ Cut at 8OQ1III..••••. St 1.95 FBE·T Fr_ncy DorltClor'l' lor EHt"'" u s .c . $1• .95 FBW-TF_ I"C'I OtT A,tplene SClInn.. Oirl!dory SRF·T Su i ~.1 R.dlO F r llQ ~"' C)' O"eclory ,_ St 4,95 , $14,95 TSQ.T ' Top seer.r Regillry 01US. G~ Frll
Number 11 on your Feedback c. rd Four In/Five Out Independently adjustable mixed audio outputs. by John R. Flint KA0 LDB Y o u ' re d riv ing down Ihe hig hway , a n hou r from home. Ir's late, and no o ne is on the local repeater. A front is moving in from the west, and it looks bad . You pick up the mike, hit a few buttons, and instantly you're linked to another repeater a hundred miles to the west. Someone can fill you in on what to expect in a few hours. Remote bases are not new, but an easy way to adjust, mix, and d istribute aud io hasn 't bee n covered in the literature. In the above system, audio from both the UHF repeater receiver and the 220 remole base recei ver are fed through a switching ci rcuit and into the mixer. The output s o f the mixer are connected to the UHF repeater transmitter, the 220 remote base transmitter, and to the control decoder. See Figure I . The Problem I first worked a repeater at the University of Missouri with the Rolla Amateur Radio Club (W0 EEE). Funds were limi ted , but we had a repeater on the air in four months. We'd worked out most of the bugs, except for two that were particularly aggravating: muffled transmitter audio (the main problem) and an inability to mix additional aud io signals not o rigi nally planned for. Several local hams were building repeaters and had similar problems. The Answer Mahlon Haunschild N4PSD and I re searched the available anicles for a solution. The common circuit at the time was a potentiometer network feeding into a single transistor amplifier. The drawback ofthis configuration was that the input impedance , and therefore the audio level, changes on all inputs, when any input is adjusted. We sought a better solution. The solution turned out to be a simple two input/one ou tp ut op amp mixer which Mahlon had bui lt during a school holiday. It performed as expected, and it' s still operating more than five years later. I built two more audio mixers, a four Photo A. Four In/Five Our audio mixer board. I f-P' ,~ I~ I RCvR ~~~ 5 I Ilrt ,.---- ... 'S ~UEW ~~ I ~~~~, I I COOITACII-, _. S",TC>[R 4>- H ~ ' O h c~"" Vt:""
Page 1 and 2: JUL Y 1989 ISSUE #3-16 USA 51.95 CA
Page 3: FOUR user selectable operating mode
Page 8 and 9: TS-790A Satellite Transceiver The n
Page 10 and 11: , Hum",3 on your FeedHet< e.rd RX.
Page 12 and 13: • IS TH-215A/315A/415A Full-featu
Page 14 and 15: , Number' on ,our Fee
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Page 22 and 23: Number60n yOY' F&edback C8rd 73 Rev
Page 24 and 25: • Photo C. fn-channef frequency r
Page 26 and 27: « transminer output. All other spu
Page 28 and 29: • Number 7 0n your Feedback e-I'd
Page 30 and 31: • Number e on your Feedb.a
Page 32 and 33: computer with a floppy drive and 1
Page 34 and 35: composite). resolution, and speed o
Page 36 and 37: • Number 10 on yO!.lt FflIdba
Page 40 and 41: Figure 2. PCBfoil dj~gram of audio
Page 42 and 43: • Special atte ntion has been giv
Page 44 and 45: 9 Autry Ir vine, CA 927 18 (714) 45
Page 46 and 47: Number 13 on your Feedback card 73
Page 48 and 49: • Number 1. on )'our Feedback car
Page 50 and 51: • SPECIALISTS IN FAST TURN P.C. B
Page 52 and 53: • Number 34 on you. F..dbM:k c:.r
Page 54 and 55: • 1 • , THE COMMUNICATIONS SERV
Page 56 and 57: Number 16 on your Feedback card ATV
Page 58 and 59: , it is a high-voltage current sou
Page 60 and 61: :: ,.
Page 62 and 63: • (See Photo A) . This is analogo
Page 64 and 65: • - ..", - ,'.. .. ... ...' ""'CO
Page 66 and 67: - • HAMSATS Andy MacAflister WA5Z
Page 68 and 69: Num~tton your Feedbkk card 73 Revie
Page 70 and 71: HOMING l~m""o " '~'F""''' k '''' Ra
Page 72 and 73: , I have built several rotary anten
Page 74 and 75: h UNCLl WA\'Nl'S BOOKSnlLf "" ';tlt
Page 76 and 77: ,-- . - " • • ,~ I~ VHF and UHF
Page 78 and 79: • = UH F - Pl-Z 39 COST $ 100 US
Page 80 and 81: • • TYPE CONNECTOR SMA TN C C _
Page 82 and 83: , ADVERTISERS R.S .I page R.S ." pa
Page 84 and 85: • began, I became ORV on ATTY wit
Page 86 and 87: • • LETTERS School Package Idea
Page 88 and 89:
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Page 90 and 91:
• • GRANO JUNCTION CO JULY 1 Th
Page 92:
• Never Say Die con'inued from pa
Page 95 and 96:
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Page 97 and 98:
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Page 99 and 100:
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