Radio Electronics July 1986 | Electronic Engineering

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Radio Electronics Magazine July 1986
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  TEK 2236100MHZ OS ILLOS OPE THE  NSWER BYANY ME SURE 100 MHz scope counter timer multimeter: All oneintegrated system 100MHzdualtimebasescope. 3.5nsrisetime; sweepsfrom 0 5 sto 5 ns/div;alter natesweep; ±2 vertical/horizontalaccuracy;verticalsensitivityto 2 mV/di v 90 MHz. 9-dlgltfluorescentdisplay. Digitallyaccuratereadoutsaccom panytheCRT waveform.Error messagesandpr ompt salsoappearonthedisplay. DcvoltsandaccoupledtrueRMSvolts. Measuredthroughthe Ch1scopeinput. Gatedmeasurements. Usethescope sintensified markertomeasure frequency,period, widthandtocount eventswithin specifiedportions ofthesignal. Auto-ranged auto-averagedcounter/timer. Frequency,period, width,delaytime,   plustotalizetomorethan 8 millionevents-with7digits plusexponentdisplayed. Auto-rangedDMM. Usefloating DMMsideinputs withupto 5000- countresolution. Getpreciseread outsofaveragedc andtrueRMSvolt age.Measure resistancefrommilliohmsto gigohms.  owm ke measurementsfaster easier withgreateraccuracyanduserconfidence. TheTek2236makesgatedcoun termeasurements,t emp erature,time,frequency,resistanceand voltagemeasurementspush buttoneasy.Youseeresultscon currentlyonthe9-digitnumeric readoutandCRTdisplay. Itscompletetriggersystem includespushbuttontriggerview, pluspeak-to-peakauto,TV line,TVfield,singlesweepand normalmodes.. Atjust 2650;the2236 includestheindustry sfirst3-year warrantyonallpartsandlabor, includingtheCRT. Integratedmeasurementsystem.3-yearwarranty.15dayreturnpolicy.Andexpertadvice.Onefreecallgetsitall Youcanorder,orobtainlit erature,throughtheTekNational MarketingCenter.Technicalper sonnel,expertinscope  pp lications,canansweryourquestions andexpeditedelivery.Direct ordersincludeprobes,operating manual,15-dayreturnpolicy,full warrantyandworldwideservice back-up. Ordertoll-free: 1-800-426-2200 Extension57 InOregoncallcollect: (503)627-9000Ext.57 OrwriteTektronix,Inc. P.O.Box1700 Beaverton,OR97075 COMMITTEDTOEXCELLENCE Copyright  0 1984.Tektronix,Inc.Allrightsreserved,TTA-324-1. USDomesticpriceF.OB,Beaverton,OregonPricesubjecttochange, CIRCLE92ONFREEINFORMATIONCARD  JULY 8 i  lelllr nills Electronics publishers since1908 Vol.57NO .7 SPECIALFEATURE BUILD THIS 39 POCKET TElEVISION RECEIVERS Here'sa round-up of thepock et-TVmarket.Weshowyouwhat'savailable, forhow much andthe perf ormance youcanexpect.FredBlechman 47 1.2GHzFREQUENCYCOUNTER Highfrequency ata low price.Fred Hufft56 HIGH-POWER FET STEREO AMPHere'san excellent wayto upgrade your outdat edsy stem 67UNIVERSAL BATTERY CHARGERKeep your rechargeablebatteriesin tip-top conditi onbysafelyrecharging them with our ine xpensive circuit. MichaelR.Wright75PC SERVICE Use our exclusivedirect-etch foil patternstomake circuitboard s foryour frequency counter. RADIO 61THE EARLY DAYSOFRADIOAnostalgic look backat theori ginalsolidstateradios. Martin Clifford86ANTIQUERADIOSTuningeyesand other  advances. RichardD.Fitch89COMMUNICATIONSCORNERAmat eur packetswitching.HerbFriedmanCOMPUTERSTECH NOLOGY 6VIDEONEWSInside the fast-changing video scene.DavidLachenbruch44TVSIGNALDESCRAMBLINGPart2.We continue our series with a look atsomerather complexscrambling schemes. William SheetsandRudolf   Graf 78 SATELLITE TVTheissuesofscrambling.BobCooper, Jr 80 ROBOTICSGivearmsto the robotics. Mark J Robillard Following COMPUTERDIGEST page88 Touchscreens, modem s,and more EQUIPMENT REPORTS23RadioShackTelephoneTester26OKIndustriesModel205FunctionGenerator CIRCUITS AND COMPONENTS 52RADARSIGNAL DETECTOR Aneas y-to-buildcircuitthat can detect signals from 50 MHz to500GHz.GregoryHodowanec65 HOW -;0 DESIGNOSCILLATORCIRCUITS Our our new back-to-schoolseries. Joseph J Carr82 SERVICE CLINICServicingadeadset.Jack Darr 83 SERVICE QUESTIONS Solution stoservicing problem s.84DRAWINGBOARD Mor eonmemorymana gement. RobertGrossblattDEPARTMENTS 112 Advertisingand Sales Offices 112 AdvertisingIndex8Ask R E 113 FreeInformationCard12GuestEditorial 14 Letters92MarketCenter30NewProducts4What'sNews RADIO-ELECTRONICS,(ISSN0033-7862) July 1986.PublishedmonthlybyGernsbackPublications,Inc..500-BBi-CountyBoulevard,Farmingdale,NY11735Second-ClassPostagepaidat  - Farmingdale,NYandadditionalmailingoffices.Second-ClassmailregistrationNo.9242authorizedatToronto,Canada.One-yearsubscriptionrateU.S.A.andpossessions 15.97,Canada   20.97,allothercountries 23.47.SubscriptionorderspayableinUSfundsonly,internationalpostalmoneyorderorcheckdrawnonaU.S.A.bank.Singlecopies 1.95. eel 1986byGernsback   Publications,Inc.Allrightsreserved.PrintedinU.S.A. POSTMASTER:PleasesendaddresschangestoRADIO-ELECTRONiCS,SubscriptionDept.,Box55115,B OUld er,CO80321-5115.   Astampedself-addressedenvelopemustaccompanyallsubmittedmanuscriptsand/orartworkorphotographsiftheirreturnisdesiredshouldtheyberejected.Wedisclaimanyresponsibilityforthe   lossordamageofmanuscriptsand/orartworkorphotographswhileinourpossessionorotherwise.Ol  LarrySteckler,EHFC ET editor-in-chief  ndpublish erHugoG ernsb ck(1884-1 7) founde rM.Harvev  e rnsback, editor-in- chief em eritus EDITORIALDEPARTMENT ArtKleiman, editor ial director Brian C. Fenton,managingeditor CarlLaron,W B2SL R,associatee dito rJeffreyKHoltzman, assistanttechnicaleditor RobertA.Young,assistanteditor lulian S.Martin,edi tor iala ssoci teByronG.Wels, edito rialassociateM.HarveyGernsback,contributingeditor JackDarr, CET serviceeditorRobertFScott, semico n ducto reditorHerbFriedman, commu nicationseditor BobCooper,Jr.satellite-TVed itor RobertGrossblatt,circuits edito rDavidLachenbruch, contributing edito rRichardD.Fitch, contributing editor Mark I. Robillard,robotics editor TeriScadutoWilson, edito rialassistantJudithKaplan,editorialassistant   adi Ile lra Who says that goodtestin stru m ent shavetobeexpensive?Thesubjectofthis month'scovercanbe builtforund er 60if you re will ing toove rlook the case.Butthatlow price doesn t meanlow performance. For exmple our coun terfeaturesanaccuracyof±1PPM±1 count andasensit ivity better than 150mVover the entiremeasurementrange from 1Hzto1200 MHz. For more detailsand completeinstructions on how to bui ld the counter, turn topage47.  OVERl NEXTMoNTH TH UGUST ISSU ON S L JULY   B UIL ANINFRAREDPOWERSWITCH Contro l your e lectr icalappliances from your easychair TVSIGNALSCRAMBLING Ourseries continues PRODUCTION DEPARTMENT RubyM.Yee,productiondirec tor RobertA.W.Lowndes, edito rial produc tionAndreDuzant,technicalillustrator K  ren Tucker,advertisingproduction GeoffreyS.Weil,p rodu ctiontrafficC IRCULAT IONDE PARTMEN TJacquelinePChees eboro ,circulationdirec tor WendyAlanko, circulation  n lystTheresaLombardo, circulationassistant POCKETTV ROUN UP Set-by-setde scription s. THE 7 An ind epth look atoneofthemostversatile CMO SlC's. Coverp hoto byRobertLewisTypographybyMatesGraphics Radio-Electronics,GernsbackPublica tions, lnc., ExecutiveOffices,500-BBi CountyBlvd.,Farmingdale,NY11735, 516-293-3000 (/J o Z o a:   o Asaservicetoreaders,RADIO-ELECTRONICSpublishesavailableplansorinformationrelatingtonewsworthyproducts,   techniquesandscientificandtechnologicaldevelopments.Becauseofpossiblevariancesinthequalityandconditionof Wmaterialsandworkmanshipusedbyreaders,RADIO-ELECTRONICSdisclaimsanyresponsibilityforthesafeandproper 6 functioningofreader-builtprojectsbaseduponorfromplansorinformationpublishedinthismagazine. o SincesomeoftheequipmentandcircuitrydescribedinRADIO-ELECTRONICSmayrelatetoorbecoveredbyU.S.patents, « RADIO-ELECTRONICSdisclaimsanyliabilityfortheinfringementofsuchpatentsbythemaking,using,orsellingofanysuch a: equipmentorcircuitry,andsuggeststhatanyoneinterestedinsuchprojectsconsultapatentattorney. R  dio -Ele ctr oni csis ind exe din  ppl edScience   Tech nolo gyIndex  nd Readers uidetoPeriodicalLiter- ature Microfilm & Microfiche editions areavailable,C ont ctcirculation dep rt- mentfordetails. AdvertisingSalesOfficeslisted onpage112.   2
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