Stepl Choose Your Bands! Single Band: 2~felers ...J 110\ 1H, . U GH, Today', lIlO\l PJPlIbr baod,lhe bN pIICt r~ new Flirty quiet. Ie;s CIll"dcd 1lun ~. "ilh aImoIl RJdio'I _ fnnier f(lfham piollcm. Shonfl" III ee Iwns 10 meet old 1wIds. Imn l-oOO opml,nr half m 1IlIII)' rtpalm nl wne hi~ thiD2.\1(If~m1tll:qc. hJ: penetraIe5b.liIdir procrdum. Very l~ndly, lhou~noh of opm furx:tions. PImtyofopmdIiI\OO$fursenu-prinle e-cn maon &: lllldnpwnd ~. Emllenl ~tn & ..~hr- e\'~hm:. G~~I for rxoJ OOIIveNlioo. Gre<ll pLl« Kl meet ~ cities. Cry~clt-..uecepciolLSj~an be'lwr.: off·l!Ie·road help. Crowlied. (hoogh. e-pccially in yoong'>lm. IdeOll for ham family.sioo: all c1a,~ fOf di>lance. ~\l1l1ber ofrepeaters illCln'ing fa cities. Smgle-band mobile" ea.'} (0 kam & use. ha," voice privilcg~ OIl 22(1. No-CodefrknJly! IhananyOllie! band, N(}-(odc: triendly! • ~ '1ultiple Band: CJ CJ • • m • 2 ~lelerl.J.W'lHl -.J 2\leler/220\lHz '4-U!' lHzi1.2GHI .J .\lulliBand roo The l'IiOmml.popular P.ol baM, A"natural" mi~ of Fur the ul1COP'oentiUl1al. thil combines tile mo<.I [f liveandbrnlhe!3dio.1bntm dlfbinh((If .....K.blselectionofaU: o;Urt...ilh2~V4JO. AdJev high activity & special group channels. th" i' popular&the lea'l ern....ded bald,. Giveseccess to yeo! Thc:y giveyouthe ilctiVIl)',theflpano,bbihly No-Cede Sk)" a'e privilego:!, ,<todd 1O~1 (Of ~()" rn.'a9 becomingtile amateur'sfavorite mOOile ng. In,(;)n( tile people & Sl:1'IK:e, on 2M. plu, thi: & and the elty. Particularly useful for aJ.......ed andTech-Plus privileg<'!. Add 1.2GHl fOf thebig( 1lU.'. ronuolofcilberband...dyouemsetup)'OUf..wioo open"..:eof220.plus thi:ad.';mLage>of~lep/Iont­ ham, ,,110...,00; inthecityand livein the -uoortx. If you'lf a ~w~'e buff. add scanning and 51 mI ~ fuJl..Juple\ ~_ ~n illiG liktdllphirtg. ValUIbk..'bmpnv~isacanm. Alk!iIO upa:ity .oldI. add_ modules, ..,.1IICed ,~"""" :\1. opmblr: a'l3\"aibble m C- 2- 220 - 'f/ 440 1200 MH, S M MH, ~:.:i' . MHz (1 .2 GHzl " 200 400 600 800 1000 1200 MI , -:::S~ten 2 Choose Your Radio! IC-28H 2 Meters IC-228H 2 Meters IC-229H 2 Meters -- Ideal ~cr rig. 45·\\' single 00nd. 21 memo Same as IC-28. wIcolor displa~·. more b en more feateres - automatic dialing. cres, LCD display. Recti\e<> \ OAA,I\\'X !>kip & scan features & priorilYwatch. 50\\' power, ultraeompac1 cee. IC·449H 440MHz IC-38A 220MHz IC-1201 1.2 GHz ___ _ _ __ --'1 35WUllF transceiver. 20 memories. Same as IC-28H. with 220's privacy. 25W A natural for tile city. Penetrates struct ures. 'iC3fIlling. optional autodial. & 21lTICTTlOl)' channels. lOW output. 2(} memories & priorily watch. IC-3230AlH 2 Meter/440 MHz IC-2410AlH 2 Meter/440MHz IC-2330AlH 2 Meter/220 MH; ' = = =- I - ---- - !IiiiBIIl-ll-I~ .. - ~ . . . .. . ~_. J . One toud! control. coke-coded controls. Same furctons as IC-3230. plus ParaWatrn ~~ J'IlIUlar & !ea.1l 1l5(d band:. combined. 25/45WOUlput, simultaneous reception. for receiving 2signals on same band Ore-tcech coarct. 36 mcmories/band. cressband repeal. 15 I1lcl1llll"ies/band. simultaneously. variable power output, hi-res display. IC-901 Modular MultiBand ,_-.:S~tep. 3 Choose ICOM! iI/;l';~n U Free . 1-800-999-9877 . . '~.. Brochure World's only 6-band mohile amateur radio. 2\11~~lHl Hotline: >tandard. Oplional !:.'OI"IHL 1.2GHz. 10M, 6~1. !~I-SSB. O __ .... ICOt.4 Ame!'co.K. ~ 1161'1 Ave NL Ilelevue.WA 9EOO4 or lloideOOnd receiver. ~-..,..............Ulpocttoet'GlgI_ ...-coOf .... , ~COM _ ........otw .~'<C-__. I/fottlg -.. ., 1,1'1192 • QUALITY - PERFORMANCE - VALUE - FACTORY ASSEMBLED A MUST FOR EVERY SHOP: and only two simple connections to your PERFORMANCE and WW COST: The SA500 Spectrum Analyzer Scope scope you will be on line in no The SA500 Spectrum Analyzer Scope Adaptor works with any Oscilloscope... time even if you have never used a Adaptor utilizes ITC's Proprietary Log Just one connection to the Vertical and Spectrum Analyzer before. Amplifier, which provides -110 dBm Trigger inputs and your scope becomes a sensitivity (.7 microvolts) and 80 dB on full function Spectnun Analyzer...Use FEATURES...FEATURES: screen dynamic range... Features only the SA500 as a Pan Adaptor...Tune up The Baseline Clipper controls the low found on Analyzers costing thousands of an HT Radio...Tune Filters, Duplexers, end signal to noise ratio. The Video dollars more.... 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MADE IN THE USA. !fyou EASY TO USE AND HOOK UP: with the SA500.. . The DC to 600 MHZ have been waiting for a low cost high rrc The SA500 Analyzer Scope Adaptor dispersion control allows full 80 dB on performance Spectrum Analyzer at an provides unsurpassed performance, with screen dynamic range without aIfordable price buy today and take just half a dozen easy to operate cudi(h degradation of the vertical signal. advantage of ITC' s introductory offer. MODEL SASoo SCOPE ADAPTOR ••••••• price \695.95 $549.95 ~ lI.t INTRODUCTORY PRICE ~ Opt. 1 50 MHZ Marker generatar... price 200.00 SPECIAL lI.t CALL FOR EARLY BIRD ~ 0l?t. 3 + t: 5KHZ narrawband filter•• price 450.00 $300.00 lI.t INTRODUCTORY PRICE Teloscoplc 21 flexible right angle antenna $9.95 n PRICE 5PEC/AL INTRODUCTORY OFFER CALL 1·800-232·3501 TO ORDER OR INFORMATION AlL PRICES AND SPECIFICATIOSS ARE SUBJECT TO CHA!\IGE WITHOl1T NO'J1CE OR 08UGATIOS. MIC. VISA, Ali, DISCOVER, CHECK • Mo:"<n ORDER OK. s.o.a. wacose, PRICE> Sewpon BNCb. CA. (USA). CA. RESIDENTS PLEASE ADD SALES TAX . DEALER INQUIRES Distributed By Navtec 1303 Avocada Ave., Suite 193 Newport Beach, CA 92660 714-552-1469 FAX 714-721-8085 CIRCLE 3 ON READER SERVICE CARD DIAMOND ANTENNAS- THE STANDARD BY WHICH ALL OTHERS ARE JUDGED ACCLAIMED AS THE TECH NOLOGICAL LEADER IN SINGLE & MULTIBAND ANTENNAS .WIDE-BAND PERFORMANCE .FACTORY ADJUSTED/NO TUNING REQUIRED .HIGHEST GAIN .UPS SHIPPABLE .HIGH WIND RATING . FIBERGLASS RADOME .DC GROUNDED .STAINLESS HARDWARE X-500HNA RUGGEDIZED BASE l REPEATER ANTENNA COAX CONNECTION ,HEAVY DUTY BASEl STRONG JOINT COUPLINGS AT BASE END RADIAL ASSEMBLY Xserles /,-- .:y vI X-50A 1441440 4,517.2 200 UHF 56 135 ,'-- " X·200A 1441440 6.018.0 200 UHF 83 112 X-30GA 144/440 6.5/9.0 200 UHF 10.2 112 147MHz X-S1ONA 1441440 8.3111.7 200 N 17.2 90 X-SlOMA 144/440 8.3/11.7 200 UHF 17.0 90 X-500HNA 144/440 8.3111 .] 200 N 17.8 90. X-700HA 144/440 9.3113.0 200 UHF 24.0 90 X-220M 144/222 6.0/7.8 150 UHF 11.5 112 445MHz X-3200A 144/222/440 6.0/78/8:0 1001200 N 10.5 112 RADIATION PATTERNS FOR X-6000A 144144011240 6.5/9.0/10.0 100/100160 N 10.5 112 X-500HNNX-500MNX·510NA BAND: 144~1 44 - 148MHz. 222:222 - 225MHz. 420=420 . 430MHz. 430",430 - 44QMHz. 440.,0440 - 450MHz, 1240: 1240 - 1300MHz. • X510NJ :144 - 147 /430 -440MHz X510 IU GH/F V & series DP·GH62 50 6.0 200 UHF 21,0 78 F-22A 144 67 200 UHF 10,5 112 F-23A 144 78 200 UHF 15,0 90 F-142A 222 55 200 UHF 6.0 110 U-300A 440MHz F·718A' 440 11.5 250 N 15,0 110 F-1230A 1240 13.5 100 N 10,5 90 U·200A 440/1240 8.3111.7 100 N 59 135 U-300A 44011240 8,6113.2 100 N 83 110 U-5000A 1441440/1240 4.518.3111 .7 100 N 5.9 135 F·22 U·300A 1200MHz V-2000A 50/144/440 2,1/6.218.4 150 UHF 8.3 110 'F-718A:440 - 450MHz, F·718J:430 - 440MHz, F·718L:420 · 430MHz , usooo GH62 THETEAM A m a t e u r January 1993 Issue #388 PUBUSHER/EDITOR Wayne Green W2NSDIl R a d i o T o d a y ASSOCIATE PUBUSHER David cassidy Nl GPH MANAGING EDITOR TABLE OF CONTENTS Bill Brown WBeELK PROOUCTlON EDITOR Hope ClJrrier FEATURES DEPARTMENTS EDITORIAL ASSOCtATES 10 The Techno-Whizzy 1, Part II 88 AboYe and Beyond Sue Jewell 81 Ad Inde.l Build a direct digital synthesis (DDS) transmitter N9JZW Joyce Sawtelle 10 Ask~boom 16 Programmable-Frequency Audio Generator " ATV CONTRIBUTING EDITORS High accuracy with digital control. Redman 92 Barter 'n' Buy Mike Bryce WB8VGE 52 Carr's Corner 24 The SP-1 Transceiver Joseph E. Carr K41PV 64 Dealer Directory David Cowhig WA1LBP Build the HF "Spider." WA8TXT 17 Feedback Indel Miehael Geier KBtUM 32 Twin Crystal Ladder Filters 54 Ham Help Jim Gray W1Xun 50 Hams with Class Upper or lower sideband filters using inexpensive crystals. ........ Chuck Houghton WB6lGP 46 Homing In ArnieJohnson N1BAC ......................................................................................N2DCH Or. Man::: Leavey WA3AJR 38 Handi-Beacon .. Never Sly Die ArCi MacAllister WASZIB 64 NewProducts Tum your tape recorder into a beacon controller WB9YBM Joe MoefI KOOV 72 Packet &Computers carole Perry WB2MGP 96 ProplIgatlon REVIEWS Jeffrey Sloman N1EWO 68 CRP 8 QRX 36 The Down East Microwave OEM 432K ADVERTISING SALES 96 RandomOutput REPRESENTATIVES 76 RTTY Loop Put your HF rig on the 70cm band with this easy-to-build Dan Harper 86 7J International linear transverter kit. KT28 Sue Colbert 78 Special Events 1-603-924.()()58 42 The SR4 Multimode Simplex Repealer 94 Unc:1e Wayne'. BooUheIf 1-800-274-7373 91 Updates The next generation of store-ano-torwaro voice controllers. FAX.; 1-603-924-9327 58 1992 Annll8l1ndex .....................•_••........•...........................................•••...WA3USG GRAPHIC DESIGN FEEDBACK. SUzaMe Sell FE:EDBACK! GRAPHIC SERVICES 1I's like beinS lh«e---riShl FilmWorks, Inc. her<: in our offices! lIow? Ju'i I.~e ""vanl"gc lIf our Hancock NH FEEDIlACK card pase QIl 17. Yoo'lI n<>lice a fttdhiock TYPESETTING number Il l'" be!;inning of Uncla Orew eaclllnicle and cDlu,"". Yo'c'd lih youIO .-au: ..tw Alice Scofield ,..... ......, >01~ ..., can prinl ...hallwn<>f lhinp CIRCULATION MANAGER you lile be>l. And ...... -:' Harvey Chandler will dra.. one Feoodback Buildan amp for the TectJno."'hizzy DDS fransmintN• • . see page 10. eard acll monlh for I free To subscribe: 1-600-289.(l388 subscri[llioo 10 7J. sp., Cover: The transceiver. Cover pholo by Mille Agslen WASTXT. WAYNE GREEN, INC. Manuscrlp" Conlnblllions in lhe form of manuscripts w~h dra"';"gs anoilor photoglaphs are we~e and will be Editorial Offices consOdorod lor possible pUblicallQn, We can assume no responsibitity tor Ion Or damage to any matenal, Please enclose a stamped, seW·addreSS&d _lope w~h each llUbmission. Peyment 10< the use of ..,y unwlicrtll'd male 70 Roule 202N fiatwill be made upon publicallOn A premium '" be paid lor ac:ceplll'd i rtoclelllhal have been wl)mitled eledn)n Petetborough NH 03458 ically (CompuServe ppn 7031D,n5 or MGI Ma~ "WGEPUB" 0< GEnie adlhU 'MAG73") or on disk IS 11II IBM· EditorialOffIQ8$ 1-6Q3-924.()()58; compatible ASCII file. Youcan 11110 COI'UCI U$ at ..... 73 88S al (6031 924·$30&3. 300 or 1200 '*'<I, 8 dala bils, no 70RoUe 202N panty. _ SKICI bit. All CClf'UtluliClfl should be dotected to ..... 73 ed~oriat oIflC9S. "How to WrCe tor 77 lJ.IideIi'>es FAX: 1-603-924-9327 Peler1lotougfl NH 03458 are .....ailliblll upon reQuest. US cc,zens must incIucIe "- SoQaI Se<;vnty numbet wen Slbmllted manu~. phone:603-9204-0058 Sub5eription SefVices 73 ~I_ R.do Todiry (IS$N 1~·2522) is ~ "o'lf'" by Weyne Green Inc.• 70 RouIe 202 North. PetertlorougPl. New Hampslwe Q3.lI58. EnIore _ 'Ni'IS C1992 by wayne Gre.. Inc.. No Pllrt dill.. publicallClf1 1-800-289-0388 may be reproduced WCl>ouI -elen pennossion !rQm IIle ~_ For SutJIocrlJIIClf1 Se<vocn, ..",e IQ; 73 Nn.iJ/elIt Advertising 0ffic, S Radio TooMy. PO. Bo~ 58666, BouklerCO 80322~. or ca.UHIOO·289-038ll. tn CO calt 1·~7·9330. The CoIotador'Foreign Subscribers 70 Route 202N sUbsC""'_ rate is: ooe yelr $24,97; 1wO years S39.97. AdOtionat poSlage lor Caneda is $1.00, and for Olhet COUnlnes S19.OO Syr1ace and 537.00 a,""a' per year, AM fo<elgn orders must 00 accompanied by Pllyment in US 1·303-447-9330 Pelerborough NH 03458 fUnds. Socond cress postage paid I t Pe1elboroug!l, New Hampshire. and at add~lonal mailing offices. Canadian phone:80Q-274-7373 secOOd class mail registral00n numbeI 9566. Canadian GST Regist'ation ' 125393314 MK:rofilm EditiOll-Univer· R. prin" : The first copy of an artK:1e sity MK:lofilm, Ann Arbor MJ48106, Postmaster. Send address changes to: 73 Amateur Radio Today. P.O. S3.oo (each addiliooai copy $1.50). Box 58866. Boulder CO 8032N I866. Wrne 10: 73 Amareut Radio Today. Circulation OffiCII Raprims, 70 Route 202N, Pete<bot Al'dil BUrN'" otCireuJilti_ (ABC)mambef1;hip . ppliadlor. 70Route 202N 0C91 NH Q3.lI58. r.,. you Petertxlrou;;1 NH 03458 ContrKt: Byreadng \tIis print have jus! enI&red inlo a bOndI'oQ . greement with 73 AmarewRadio Today wen to inlroduee _ person 10smal_ r1IdlO _ !he ....0<1 3Dcays,Why no! share _ back issuesd 73 phone:603-924-0058 Ihem? lnri:........ into your shad< and lel'em maJ<e I __ c:onc;w;ls.lAI w know/lowyou do, 73 Amateur Radio Today- January, 1993 3 ~ 1 on yOU' Feedback Clln:l \/OIVeddwointh' packet radio. AM it isn' as if you know that there are several Ihousand hams having a ball with n. So let's look at this lear thing and see If we can understand it better. Peo un ple generally lear things they don1 derstand. nght7 SO tel's look attha otIl er side 01that coin. Are Ihere any NEVER SAY DIE things you understand that you lear? I said lear. I'm no! alraid of electJiCiI)'. I Wayne Green W2NSD/l respect iI. t've gotten knocked on my ki ester a couple 01 times and thaI's gen erated a surprising amount 01 respect. But ij's not fear or terror. Once we take the trouble 10 lind out more about the things that we are no alraid of we longer are afraid, I'm afraid when I'm wallOOg on a New Yen street at night and a group d black or Being One's Best Hispanic teenagers pass me. I'm alraid When I took on my responsibility as value 01 this approach to lile and adopt because I con't know whether Ihey are While watching coe 01 Perot's com- a member 01 the New Hampshire Eco- rt. So how about you? Doyou eeme lor dangerous or not. II's the unknown. II I mercials a lew days before the eecnco. nomic De...erocrrent Commission I re- less than the best in what you do? Are er- were to lake the trouble to get to know I took particular note 01a comment fused to let the politicians and their you the best at work? Ale you achiev ee- \hem I would no longer be afraid. made by both Ross's lamily and lriends forts k) block the Cornrnssion !rOm ing your best in amateur radiO? Are you The next trne fear twts, perhaps you lhat he urged them to notjust be good' ing anything 01signifiCance hold me leaming ell you can Of are you cheallng can consider that II you understood or belter, but to be the very best they bacK. Ross's idea resonated with me. yourself? When you goldbrido:. Ihrough what you are alraid of you wouldn'l be could be in ere. this Is a philosophy Whenever I take up a new Interest I life you'reonlycheating )'OU"$811. afraid. SO, instead of learlng and pr0b worthy 01consideration. It got me to tend to go at it whole hog. When I got ters see, what is there !O do in am ably running away or avoiding, try to thinking .•. ha...e I done my best to be interested in horseback riding I took ateur radio that I haven't done yet? lind oul more about wnat has fright the best? How about you? lessons ... arld more lessons. I rcoro What new challenge Is there for me? ened you . , • knowing met this will Here you are. a licensed amateur. ceuer and better ellperts arld soon I What challenge is there lor you? What eliminate your fears. That means you've passed the license was teaching tiding instructors mysell. haven1 you done yet? Why not? What Religions rule billions of lives ellClm. Did you do it the easy way, by When I got into spatS car rallying I first are you'" excuses? through lear. Fear 01 punishment lor memorizing the Q& As? Or did you learned to navigate and then to drive. I c..... sins. Fear of the devil, of heMfire, and btJl:kle down and leam the theoty which de...eloped a new navigation system so on. I can't lault them lor that be you were being tested on? And since which lined shelves with trophies. I HovIs yoor chess game? Chess is a cause it pays oil, It pays 011 in billions of you've cctten your ticket ha...e you needed special watches which would wonderful game 10 teach kids because dollars. We have some elltremely been trying to learn more? I wiSh I keep time accurately all day so rtocno lt's lolally skill, with no chance element wealthy raUg·ions. all built on fear. But didn't know the answer to thaI. a tactory in Germany to make them for whatever. When you get invol...ed with you know. we haven1 a shred of prool As an amal8l.lr you have the opper- rre and I ~ed them. I discovered a chess you soon discover that the more !unify toget involved witha wide variety special pepperllrinder-~ke calculalor you learn about the game, the better thai any of these tears are real. MiliQns 01 people believing things doesn' make 01 activities, How much advantage used in Europe for currency censer- you play. A good player will always have you taken of this incre<:lible cccce- SiOns. but which was ideal lor ralying. I trounce a lesser player. Aha! So how !hem true, oIhefwiSe the soo WOUd SIiI be spinning around Ihe earth and tunity? Are you mar1ling time through _ nt to the Curta lactory in Liechten- does one get to be a good' player? You Columbus would have lallen off the ten made a what's of your Iile talking aboul stain and deat to import them 00 thai the same way you gel good at nothing at great length on 2m or DOe of for ratlyists. I de...eloped and printed my anything else ... you read a lot about it edge of the woOd. own Now. are you ready to give packet a the low bands? rally tables. which were Incredibly and you take some lessons from an ex try? II's wonderful fun and you're miss Being the best In amateur radio si"llie COflll<lred to those made by oth- pert. You'll have to memorize hurldreds means different things 10 dilferenl 101les. ers. My ccstorers _re soon winning of openings, and mccsancs of end ing a whole big piece of our hobby. Yes, of course YOU're going to have to Ieam To me it means learning as much as alIlhe rases. game closings. You learn to be aggres a lot. And you're going to make all you can. II means exploring every When I got Interested in photogra- Sive or lose. The lact is thai the game kinds 01 duam mistakes. Hey, there's IOOde and every band. It means work- phy I read books, took lessons and of chess is a 'Mlnderlul faacher lor liIe. always a first, right? ing OX, going on DXpedillons, wor1dng spent endless tcors in the sc:hooI dark- In teach you the lundamentals 01 busi Step two ... I expect a erter from packet, ATTY. SSTV, moonbounce. room building my skills. I armed myself ness. You'U learn 10 do your homework, you thanking me for pushing you Into OSCAR, nansmqter hunts. ham club with everything from 35mm to 5x7 cam- be aggressive, and look for creative this. work. helping put on hamfests. helping eras. This helped me greatly when I be- new approaches to old Situations. You'lI wilh emergencies. handli ng tralfic. came a TV cameraman at WPIX in Ieam the valUe of persistence. Rea500 Prevails helping newcomers get licensed, build- New York and knew how to compose Go Is another game of sk~1 and its The League has backed down on ing equipment, winning contests. run- pictures . .• and later when I was a TV popularity In Asia has a good' deal to do a their oppo$itiOn 10 automatiC relaying fling repealer, pioneering new ilodes direclor in Dallas and in Cleveland, I with the way the Asian countries have or lechnologies, making friends lor helped my cameramen get great pic- been running circles around us in busi on the low bands. 1'1 let the packeteers cuauues give you the gory details on what hap America in other countries. and even lures. In my early publishing days I took ness. Chess and Go leach pened. serving your country in time of war. most of my own pictures. which are "'aluable to a country. They Then there's being your best at your I didn't take up skiing until I was 44, help teach the work ethic. You don't win I can oncerstaoo concems aboutlhe blind relaying 01 messages, where work. What a shame It is when parents bul men I went et it furiOUsly. I look at chess unless you work at it, bul il there would be a strong possibility 01 don'l teach their children the nrocr- lessons and more lessons. In just a lew you do you'l surely win. That's great jarrming oontacts already in progress. lance of being their very best. To me weeks I was skiing eenee than I ever training lor liIe. This Is mUCh like K1MAN or W1AW that means knowing more about my thought rc be able to in my life. 50 f work than my coeceutors. II means took even more lessons. Now. at 70, Fe.. coming on their sell-assigned frequen ees and broadcasting blind. endlessly doing my homework , .. I'm brittler and thus a M more cautious One thing tners been bugging me Is Mosl 01 us pick what sounds like an which isn't actually work because it's in the trails I ski since breaking some- why so few hams have actually tried unused frequency and then ask if any fun, It means attending conferences, thing would be extrerrets inconvenient, packet radio. I wonder if it has some one is using It before we launch into a taking classes. readIng books, sub- but I still tear down the mountains. bav- thing to do with lear? A fear 01 erma.r ca. tong Pertlaps the packet ooilware scribing to magazines. I just bought a ing more fun than should be legal. rassment 01 making mistakes when new stack of books and am working my Somehow my parents 9CJI across to you're into ~lhing oomplelely new? developers can get our packet (and se-e ATTY) systems to emulate this ap way through them. are tediOUS to me the ococect 01 trying to be the beSl I A lear ci displaying your own ignorance proach. II a relay station could send a read because they're so poorty writteo, could at whatever I got Interested in. of both radiO and ~? A tear of short coded signal which WOI.oid ask if but most are wonderful and give me I've been preaching (his Idea in my ed- the unknown? lots of Ideas, tenets, hoping others would see the It isn't as if iI costs much 10 get in- Continued on page 66 4 73 Amateur Radio Today . January, 1993 Kenwood's TM.241A (l44MHz:), TM-331 A (220MHz), TM-441 A (440MHz), and TM-54IA (1200MHz:) mobile transceivers offer sports-car performance with famlly-e:ar convenience. • High power The TM·24 ,Aprovides 50W, IM·331A is 25W, IM-441A35W, andTM·54IAlOW. Three poweJ _ :I. 10 ... ful. lhe 1M-1m los "''''. posirions: l and 10 wons. • Widebond receiver coverage The TM·241Arereves from '1 8to'73.995MHz; IJonsmil rongeis 144-148MHz(moddioble for MARS and UP operol'ion, pemii~ required). Other I~ ore 111-130MHz 11M-331A1. 438-449 99SMHI I1M·" lAI. endI14D-I199.99SMHI I1M·S4IAi. • 20 memory chonnels 20 rrtulti-fu1lCfion memory {honnels store hequency, repeotelOffsel, sub-tone frequencies, and repeater leve~ data. Repeoter offset on 2m is outomotKolly selened. Thereole 4{ho@els fO/"oddsplit" operotion. • Multiple scaa modes wim Bond and memory s<on, ~ble S<Dnstops and memOl'f (oonnelltxl-ool. •cress built-in Selecteble from hoot pcnel(aptional KOT·8decoder ovoilcblel. • Selective (oIling & poger option TheDTU-2optionenablesOTSS (DuoHone Squekh System)fOl selective(oilingandpagingusingstandard OIMf tones. 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C.n.~. l SI IS8 Number 2 on your Feedback card and doing something about getting cuus lor years and never figured it LETTERS young people interested and up out. 1 always looked lor feedback grading their own skills in a few of Irom the emitter or collector to the com Ihe muIIiple areas 01 amateur radio. base; I did not realize it was a From the Hamshack mon A suggestion I would make is to base configuration, adopt a library, either a school or The rest 01 the article was equally public library. Make it a normal prac insightful. Thank you. tiee 10 donate a book on electronics Joel Weder VE6VOX, Calgary, imagine. we usually gel quite a pile or amateur radio on each of your Jim Kocsis WA9PYH. South Alberta, Canada I was reading my up when we gel on the rig. birlhdays or on July 4th as a birlh Bend IN Wayne, I thought I'd better July/August copy 01 The Planetary I have been here lor eight years, day gill to the country. Skip that write to you and let you know that co Repoff (published by The Planetary arriving as a private and commercial meal out in the restaurant and I've been taking some (not all!) 01 Society, which promotes space ex pilot ground instructor and have nate a book instead. Send the XYL a your advice. A rst 01 all. I'm a sub ploration) and came across a rather moved to being the seniOr instructor card and tell her that her ttcwers scriber since 1965 so I'm a Iong·lime erncre. inleresting "Doing More With lor 747 avionics systems lnstructcn were converted into a book. Encour reader 01 73. Less: The New Way of Exploring the lor the flight crews. My termer occu age others to do the same. Ham radio is alive and well In our Solar System," by Rex Ridenoure. pation was as a physiCs teacher in a town and I'm lairly active. but I The article discussed the trend to high school in Minnesota. Wayne. I Fred E. Pierlng WD9HNU. Mait thought I would share some info with wards smaller and more eeet-eeee do agree with some 01' your conclu land FL My Godl Wayne, what's you and 73 s readers on reo-rem uve space probes. What's interesting sions in your editorials concerning this world coming to? Since lhe birds radio subjects, I read a tot and have about It for you and me is his de the education of youth. However, It have lelt the nest, my wile has con read some very interesting books in scription 01 the rate oflectmological Is easy to use a big bruSh and 10 lemplated starting a small business, the past lew years. There are much change involved: " .. . the SOl and think every classroom is the same. such as a groceIY shopping and de more interesting things and thoughts commercial space segments are There Is a 101 of quality out there. livelY service for the elderly or in!inTI going on In the world than what the we three to live years ahead 01 the Granted, there may be less than in (She likes to spend other people's AP, UPI, etc. think shoUld know. space exploration lield in developing previous decades, and the objec money- read: mine). So, when I Why am I mentioning this In a and applying new satellite technolo tives 01 education may nol be appro read your editorial in lhe November ham radio magazine? Only to prod gy; these groups were preceded by pnato 10 IOOay's required work force. issue I showed her the section you people to talk about more interesting the academic and amateur radio So. why am I not Slill in the class wrote concerning "Making a Buck." things than RST, the rig, weather, communrties." room? I had given a lot 01 effort to When I found her reading page 76 I a SLs, etc. My gosh, we have a These days everyone (Wayne es the students , received several Inquired, "What are your doing?" "meeting room" that spans the coun can pecially) seems to be wondering awards for leaching excellence, and She responded that she found you try (actually the world!) that we where amaleur radio is going--what received Itttle support from the local very interesting and profound, very use 2-4 hours a day for lree and we will be our reason lor being. Well, I administratiOn. I did what I wanted to Informativei are not dOing itl I've tried skipping think this article just shone a little do, did well, but received nothing ex She aaked hOw long you had the rubber-stamp OSO format and light on the path . There are still tra beyond what an "average" teach been writing editorials and I told her have had some excellent discus hams experimenting at the forelront er would receive. Finally, teaching 30+ years thai I could remember (l sions With fellow hams. I heavily rec of technology, whelher it be with OS college placement physics, standard still have some 73s from the begin ommend this to the readers of 73- CAR, packet or repeater linking via physics, and aerospace; and acting ning), Well, now I am under stnet or As far as TV is concerned, I per sateune. The club that I recently as radio dub advisor, chess d ub ad ders that from now on when I re sonally only watd'l a few shows reg Joined here In Calgary (CARA) is visor, faculty social committee chair ceive my 73 in the mall, I am to turn ularly. I want to be Intcrmed or enter sc one of the most progressive I've man, athletic lield manager and It over to her so she can read your tained (made to laugh , not de seen because (Il. seems to me) they ence depanrnent chairman wiped edilorials. Maybe she should pay lor peessedt). What can you do in your keep politics to a minimum, aren't me out. The number of students in the next subscription? spate lime if you don't want to yak alraid to jump into a new project and creased and the money available lor on the air? Anything! But don't waste concentrate on getting things done. supplies went down, How do you L. E. Olcknon N8MKM, Jack. your time doing the same thing over Those are, as any good business teecn physics when the annual mono son OH Wayne, your June editorial and over and over again. My gosh. man knows, among the central keys ey per student lOt all supplies is less requires some comment. I agree we're not robots (or are some 01 to success. than a meal for two at McDonald's? that 20 wpm is a little silly in our digi you?). And il you can't read when I recently gave up a well-paying Until the business world and the tal world. I am a Tech with 5 wpm, there is lime (my eyes get tired at cucuc job as a military photographer to go want to have responsive, but I really can't see the value In sur night but I still leel like I need some tneocs to college. Most of my think Quality schools and are willing to fering through the code to upgrade. input) there are tapes al your iccarn I'm crazy to do such 8 thing during a SUPPOrl appropriate school goels Why not a series of tests which em brary that are Instructive, entertain recession. but When I graduate as a emotiOnally and financially, there wiU phasize theory, rules and COUR ing Of just pleasing to the mind. Did telecom technologist it'll "open a be little change. t did get tired 01 mu TESY? you ever try listening to one 01those whole new world" to me, I guess my sic departments getting personal I started reading 73 as an SWL subliminal tapes (weight reduction, point is that we, as amateurs (and computers to maintain Inventories ot because you had good articles on controlling anger, dealing with angry North American soclety as a whole), instruments, uniforms and candy antennas and other topics and be people--Ihe list is endless)? Did you need 10 be willing to take chances sales while the SCience department cause you didn't talk about SWls as ever try listening to a tape on sen on change and innovation. We can uses instructor-purchased comput if they were vermin. It takes more hypnosis? Or music Irom another not allow ourselves to continue be ers. It was that or have none. But than glossy paper to make a maga culture? There are tapes that are ing afraJd 01the future, then, music and athletic depart Zine. condensed verstons 01 some very ments have their parent supporl Speaking 01 high-tech. I would good books. Du 'ld K. Hansen K B0EVM, groups. Maybe there should have like to build a digital Signal processor Now, alter you've read something Jeddah, Saudi Arabia Greetings been a science concert some and a panadaptor or spectrum ana off the beaten path, try telling some arr from Jeddah, Saudi Arabia. Amateur evening. lyzer. Where are the projects? I en one you contact on the about it radio is pretty limited here, although There will continue to be young joy "Above and Beyond" because it and discuss tt-you will be pleasant the Oasis Amateur Radio Club has d reamer teachers, there will be pushes my un<Serstanding to the um ly surprised by their reacuo nt ome own been in operation since last Febru- those who sacrifice their lamily it. Isnllhat what Ir s all about? lor people at work. Mostly what rve ary, The call is 7Z2AB and our OSL time to do a good job, but some- heard is: "Gee, I always wanled to manager Is AAOBC. Th ere are where around the 30- or eo-some- Guy Metrocavich, via Inatinet I know about that . .. but t never had about 15 hams on the roster and things they look in the mirror and thoughl Sheets and Grafs article tl· the time." many activities going on. The equip- make some inner comment about tied -ATV Transmiller, Part I" (Au How about it Wayne, am I right? ee ment inCludes an lCOM 725; a Ken- "what Is this gelling me?" gust 1992) was greal. I enjoyed The most exciting things are the un' wood 44OS; beams lor 12 and 17 Let me get off the soap box and thorough yet concise Circuit descrip known and the new. not the same meters, and lor 10, 15. 20 and 40 to the main reason lor writing. Being tion. For example, the description 01 old same old. can meters. Our hours are somewhat here I appreciate the restrictions the 01 oscillator gave me all I need Pl ease keep "on our case s' limited, but any availability of opera- on radio operations. I only hope that ed to understand how it wor1ted. Wayne. we need the constant men iii tion is appreciated. As you can amateurs are picking up the baton I have seen this oscillator in Cir· vationl 6 73 Amaleur Radio Today -January, 1993 ~ Real·Speech Voice 10 Option Available With ~ DVR·l Digital Voice Recorder Shown At Leftl LNG-(*) REP-200 REPEATER $59 ONLY _ .._ocl A microprocessor-controlled repeater with autopatch FEATURES: and many versatile dtmf control features at less than you • Vwy low noise: O.7dBIIt1l. O.8dB lJ'I might pay for a bare-bones repeater or controller alone! • High gain: 13-20d8, l;lepends on Iraq • Wide dynamic range - resist overload We don' skimp on rf modules, either! Check the features on R144 • Stable: lOW-feedback dualilate FET Receiver below, lor Insta~: GaAs FET front-end, helical resona "Specify rtniIIg ""'0".' ~,)(l> .f6.~ 137-152. e DVR-1 DIGITAL VOICE 152·1Tl.21().2JO.~7O, ~_. tors, sharp crystal tiltefs, hysteresis squek:h. NEW RECORDER MocUe Primarily a voice 100er Kit $1095; w&t only $12951 LNW-(*) for .-peate~ May also be useo as a coot..t CO Ciller or as a Voic.ID Option Sfal. M MINIATURE Mradio nolepad 10 record up to 20 I PREAMP se-conds 01 receiveo transmissions for instant recall A5 I rlIpe;lter 100er, it will u- $29 ki1. $44 _ _ record)'OlM" voice. using .. the buill ONLV in mioophooIe or an external mie It can • GaAs FET Preamp sin'itar to lNG. ex· be used wilt! almost any repeater COR cept designed tor low cost & sman . 121. module, As a contest cllIer, you can Only 5/8W x ' ·S/S'L )'. 3/4"H. Easily record a message or even SlIVE1ral mes sages and play them tlll"ough your mounts in many reoce. transrrutler at the press of a switch. As "Speedy ILfWIg tw>gII. 15-3:5, :6-06. ~ a radio nolepad, you can keep it wired Other models available: ll;I-I20,I»ISO. 150-1OO.2OI»lO. <000-500_ to the audIO QUIpu\ of a receiver ready to record up to 20 seconds of anvthll19 REP-200V Economy Repeatef. 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Interface 222, 432, 435, and alv. l W output. dIrectly with most TNC's Fast. diode· wlo t'IIIlical res or ere. Kils $129, w&t $219, Kif only $89. PA's up to 45W available. switched PA's outpuI 15 or S/JIN. • R137 WEATHER SATELUTE RCVR !of 137 MHz Kit $129, w&! $219 CIRCLE 57 0 11I REAOER SERVICE CARO Q R X . • • HurnbM 3 on yOU' Feedback card The Emergency Broadcast Please contact Carole at P.O. Box 131646, capabilities described in subparagraph Staten Island NY 103t3'()()o6, or call her (A), (B), or (C) of paragraph ( t), as such System Today at (718) 983-1416. capabilities are defined in such regula tions, shall be manufactured in the United Hearing "tttts is only a test" broad States or imported for use in the United cast by your local radio station may be States. come a thing of the past. The FCC has Congress Enacts New {By Roy J. Cloutier, adapted from public announced a "comprenensfve attic-to postings on Prodigy. TNX WestJink Report basement- plan 10 overhaul the Emergen Restrictive Scanner Law #637, November 12. 1992.J cy Broadcast System (EBS). EBS has not been updated since 1976. Its name may The law prohibiting the manufacture be changed to the Emergency Warning of scanners with (or easily mocIifiable to Space Symposium a System (EWS). Include) the cellular bands passed the Proposed is a new form of silent testing Senate (reportedly without debate) on Oc Great Success! and a cutback (from weekly to monthly) in tobe r 8th. The "ceuuter ban" was an the amount of on-air testing. Actually, new amendment to the FCC funding bill and it The Tenth Annual AMSAT-NA Space equipment will be able to lest itself. is entirely possible and even probable that Symposium and meeting was held at the The FCC is suggesting a new "subaudt most senators ha d no idea the cellular beautiful lntelsat Headquarters building in ble" warning system that will preclude us amendment was there or what it meant. WaShington, DC, on October 9- 11 . The ing the familiar 2O-second lone that mixes The following comments, which have ap 300 in attendance heard presentations on 853 Hz and 960 Hz together in order to ac peared in several places, are speculation such diverse subjects as antenna testing tivate emergency listening devices. until an official interpretation is published: for the Phase-3D spacecraft, use of the Cable operators, who currently do not (1) Receivers With external converters, PACSATs, SAREX hardware configura have to perform EBS lests, will be required lab-type receivers and tunable receivers tions and the AMSAT awards p rogram. to join TV and radio broadcasters. are not affected by this law. Scanners are Once again this year, the AAAL co-spon In 1991, EBS was used more than 1,500 affected. Once the law goes into effect sored an educational workshop at the times. The Emergency Broadcast System (180 days from October 8, 1992), no scan Symposium. A complete satellite steucn was activated nearly a day before Hem ner can be manufactured Ihat will cover that was installed for the weekend was cane Andrew hit the south Florida coast. the cellular bands, nor can it be made to used to make several AO-10 and AO-1 3 eso EBS was establi shed in 1951 as the be easily modified. contacts, including a scheduled with CONELRA D (Control of Electromagnetlc (2) It looks as though as long as the a special event station at the AMSAT-Den Radiation) system during the Truman ad scanner is made with a continuous large mark meeting being held in Copenhagen. ministration to provide the president with frequency range, you can include the cellu Dr. Ron Pa rise WA4SIR was the ban the means of addressing th e American lar frequencies. quet speaker. He entertained the audience peopl e In the event of a nuclear attack. (3) This law does not affect used scan with a talk, slides, and a movie detailing The service has yet to be used during a ners or scanners that were manufactured the Astrc-t space shuttle mission on which national emergency. prior to the effective date of the law. he was a payload specialist and SAREX The Truman administration envisioned Here is the exact text of the new law: operator. The evening ended with presen that the President or a government agency SecAOB. INTERCEPTION OF CELLU tations of awards and a drawing for the nu would activate the lone to control a master LAR TELECOMMUNICATIONS. merous door prizes that were generOUSly radio or television station, one specifically (a)AMENDMENT-Section 302 of the donated by many different companies. constructed to withstand an atomic explo Communications Act of 1934 (47 u.S.C.) is The printed proceedings (32 papers, al sion. The station's command tone would amended by adding at the end the follow· most 300 pages total) are available from be heard by other stations, linked in a ing new subsection: AMSAT-NA Headquarters. Look for a de pyramid: Those stations would be heard by (d}(l) Within 180 days after the date of tailed report on the meeting and sympo other stations, and so on. enactment of this subsection. The c om sium in the next issue 01 the AMSAT Jour Currently, EBS Is only used at the local mission shall prescribe and make effective nal. TNX AMSAT-NA; Westfink Report level to notify the public of dangerous con regulations denying equipment authoriza #637, November 12, 1992. ditions: toxic leaks, tornadoes, burrcenes. tion (under Part 15 of Title 4 7, Code of chemical fires, earthquakes, floods and Federal Regulations, or any other part of SUCh. The EBS was even used during the that title) for any scanning receiver that is TNX ••• LA riots to call off-duty police officers back capable of- to work. TN X The F. O. Flyer, October (A)receiving transmissIons in the tre • • • to all our contributors! You can 1992. quencies allocated to the domestic cellular reach US by phone at (603) 924-0058, or radio telecommunications service, by mail at 73 Magazine. Route 202 North, (B)readily being altered by the user to Peterborough NH 03458. Or get in touch receive transmissions in such frequencies. with us on CompuServe ppn 703tO,n5; Youth FORlm 0' MCI Mail "WGEPUB~; or the 73 BBS at Interviewees Needed (C)being eqUipped with decoders that (603) 924-9343 (300-2400 bps), 8 data convert digital cellular transmissions to bits, no parity, one stop bit. News items Carole Perry WB2MGP Is seeking ar analog voice audio. that don't make It into 73 are often put in ticulate, active amateur radio young (2)Beginning 1 year after the effective our other monthly publication, Radio Fun. sters up to age 18 to be interviewed for date of the regufations saootea pursuant You can also send news items by FAX at II various youth forums across the country. rc paragraph (I), no receiver having the (603) 924-9327. 8 73 Amateur Radio Today · January, 1993