Hammarlund_SP-600-JX-17_serv_user.pdf
SP-BOO- JD.7 COIOlUNICATIONSRECEIVER FOR SINGLEANDDIVERSITYRECEPTION INSTRUCTIONANDSERVICEIlANUAL , Checkedbylibrary.-.-:= THEHAWARLUNDMANUFACTURINGCO.INC. 460W.34THst.NewYork1,N. Y. SP.600-JX17 COMMUNICATIONSRECEIVER INSTRUCTIONANDSERVICEMANUAL TABLEOFCONTENTS SECTIONS Title Paae IINTRODUCTION2 IICIRCUITDESCRIPTION4 IIIINSTALLATION7 IVOPERATION 9 VMAINTENANCE13 VIALIGNMENT17 VIIREPLACEABLEPARTSLIST33 ILLUSTRATIONS FigureTitle f!e - 1.FrontPanel1 2.Block Diagram23 3.TopVieworChassis - Alignment Adjustments 24 4.Audio andridelityCurves24 5.SelectivityCurves26 6.RearViewofChassis27 7.TopViewofChassis28 8.PartsIdentificationforLocatingTestPoints29 9.Schematic DiagraJn30 10.Connection Diagram-Receiver Chassis31 11.TuningUnitConectionDiagram32 12.CrystalControlUnitConnection Diagram33 TABLES No.Title - 1.Tube Socket Voltages21 2.TubeSocket TerminalResistance22 3.RFandHFOscillatorAlgnmentFrequencies andAdjstmentDesignations25 4.ApproximateSignalInputatIFFirstMixerV5; FirstHeterodyneOscillatorV4;fourstagesofIFlificat1on,V7,V9,V10and Vll;Detector,AVeRectifierV14;NoiseLimiterV15jBeat FrequencyOscillatorV13i IFoutputandAFamplifier,v16Aandv16B;Output Power StageVl7,andthePavel Supply System whichincludesB PowerRectifierV19,C Bi.asRectifierC20and Voltage Regulatorv18. Inthecircuitsfordouble conversion, usedtorsignalfrequenciesabove7.4 megacyclestheSecondMixerv6and SecondHeterodyneOscillatorVaaresubstituted torthegatetubeV7. Apreciserotaryturret1s usedtochange bands.ItassociatestheRFtuner, sub-assembliesoftheantennacoupling,thett-stageRFamplifier,andthefirst heterodyneoscillatorofthebandselectedYnth thecircuitryintheRFstripcommon toeachband.Inthisway, eachRFtunerSUb-assemblyi$positioneddirectly adjacentto:itsrespectivetube and gangsectionofmaintuningcapacitorClA-ClH. InputCouplin.Theantennainputcouplingprovidesanoptimummatchfora95- ohmcoaxialcablelineconnectedtoantennainputconnectorVl.Onbands,1,2,3, and4,theantennaRFtransformerissecondary-tuned bydualsectionClA-C1Bofthe maintuningcapacitor;on bands5and6,bysectionC1Aonly.Acapacitor,suchas C3torband1,isused$0thattheantennacircuittrackingmatchesthatoftheRF amplifier. RFAmplifier-TheVl andV2stagesoftheRFampliferareidentical,Vlis secondary-tunebydualsectionC1C-ClDwhileV2issecondary-tuned by dualsection ClE-C1Fofthemaintuningcapacitor.Complexed couplingisusedinRFstagesto maintainamoreconstantlevelofsignalgainoverthefrequencylevelsofeach band. High imagerejectionratiosareachieved throughtheuseofthreeHighQtunedRF circuitsand by double conversiononthethreehigherfreuencybands.Thehigh gaindevelopedbytwoRFstagesassuremaximumsensitivityathighsignal-to-noise ratios. FirstHodyneOscillator(variablev4) -FirstHeterodyneOscillatorv4 functionsasaColpittsoscillatorforthethreehigherfrequency bands andasa tuned-gridoscillatortorthethreelower frequency bands.DualsectionC1G-ClBot themaintuningcapacitorprovidesforthevariableturingoftheoscillator.For singleconversion,theoscillatorfrequencyis455Kchigherthanthesignalfre- quency, Whilefordouble conversiontheoscillatorfrequencyis3.955mchigher thanthetuned.insignal. FirstHeterodyneOscillator-(CrystalControlledV3)- ForservicesreqUiring extremelystable,fixed-freuencyoperation,acrystalcontrolledhigh frequency oscillatorisprovided.Instantchange-over fromvariabletocrystalcontrolled oscillatorwith a choiceofsixcrystalpositionsiseffectedbyafrontpanelXTALS control.A secondfrontpanelcontrolmarkedDeltaFrequencypermitsatolerance adjustmentofthecrystalQscillatorfrequency overthe+.005(purchasedcrystal tolerance)range. 4, For doubleconversion,theconversionoscillatoroutputfromV3isaugmented b v4. ConversionoscillatoroutputfromV3isavailabltatHFOoutputconnector sockt J8attherearofthefrequencycontrolunitwhenthefrontpanelcontrolisina crystalposition;butwhenthefrontpanelcontrol1ssettoitsEXTposition,the conversionoscillatorvoltageforthereceiveristhatWhichisexternallyconnecte toJ8. IntermediateFrequencyAmplifierSingleconversionto455KCisemployedfor signalfrequenciesbelow7.4metTherearefourstagesofIFamplificationin corporatingtheHammarlundpatentedfiltercircuit.Sixpositionsofselectivity provide6dbbandwidthsof.2,.5.1.3,3.8,and 13kc.Onthethreenarrower bandwidthpositionsthecrystaltilterisinoperation.Thecrystalphasingcontrol providesextremeselectiviyforthehighattenuationofcloselyadjacentinter- feringsignals.Double conversion 1s employedforsignalfrequenciesabove7,4mcs. Thesignalisheterodynedto3.955mcbytheFirstMixerV5and HeterodyneOscilla- torv4,orV3forhighimagerejection.nle3.955mcssignalisthen heterodyned to455KCbytheSecondMixerV6andthe3.5meFixederystalControlledOscilla- torVaforselectivity.For doubleconversion,thetUlledcircuitsandthe3.955mc IFtransformerT2assureappropriateinputtotheSecond Mixer v6.IFtransformer TlintheplatecircuitOfV5isresonnttoboth455kcandto3.955 mes.For singleconversion,the455kesignalpathisto455kcIFgateV7jfordouble conversion,the3.955mesignalpathistoSecond Mixer v6.Theprimefunctionof V7istorenderthesignalpaththroughitan opencircuitfordouble conversion andavailabletothesignalforsingleconvf:rsion. The3.5mccrystal-controlledheterodyneoutputfrom v8isavailableatIFO connectorsocketJ6attherearskirtofthereceiver,whenthefrontpanelIFO switchissettoitsINTposition;butwhenthe!FOswitchissettoitsEXTposi- tion,the3.5mcconversionoscillatorforthereceiveristhatexternally connectedtoJ6,sincevBisnowinoperative. DetectorandAVe-TheV14tubeisusedasahighlevelDetectorandAVe rectifIer.TheAVecircuitisprovidedwithseparatetimeconstantsforOWandMCW operation.Aveand Diodeoutputterminalsprovideforconnectionsindiversity applications.TheAVCbiasdevelopedisappliedtoVl,V2,v6,V7,andV9,butthe biastoVl andV2isreduced through useofavoltagedividernetwork(resistors R48andR53). TheBFO-AVCswitchprovideschoiceastoaFASTorSLOWtimeconstant.Since theswitchfunctionsalsoasaBFOswitch,twopositions,BFOFASTandBFOSLOW,are provided. BeatFrequencyOscillatorThebeatfreuencyoscillatoremploysahigh capacityColpittscircuitwhichprovideahighorderoffrequencystabilityand minimizesoscillatorharmonics.TheBeat FrequencyOscillatorVl3,iscoupledinto thedetectorcircuitthroughBufferAmplifierV12,whicheliminatesoscillatorlock- in.Atrontpanelcontrolvariestheaudio-beatfrequency fromzerobeatto+3kc . ThebeatfrequencyoscillatoroutputfromV13isavailablealsoatBFOconnector socketK7attherearapronofthereceiverwhenthefrontpanelBFO switchisset toeitheritsFASTorSLOTt1INTBFOpositions;butwhensettoeitherofitsFASTor SLOWEXTBFOpositions,thefunctioningbeatfrequencyoscillatorforthereceiver1s thatwhich1sexternallyconnectedtoJ7,sincetheoutputfromV13issuppressed. FrontpanelswitchcontrolMOD-CWrendersV13operativeforCWoperation.An externalswitchcontrolconnectedtoterminalsBrotremote connectorsocket AN3102A-14S-2S(J4)ontherearskirtmayalsobe usedtoperformthisflction, since.theseterminalsare10parallelwiththecontactsofthecontrolswitch. Alternatetotheuseofthebeatfrequencyoscillatortorenderakeyed-carrier CWsignalintelligible,alocaltonegeneratormaybeexternallyconnectedto terminalsA andBofJ4toamplitude mod1latetheewsignal.flheuseofalocal tonegeneratorprod1ces asteadytoneevenhenthereceivedcarrierfrequency drifts.J4isfurn1shedwithconnectorplugA and 3l08B-14S-2P andcableclamp AN3057-6. NoiseLimiterThenoiselimitercircuitV1Slimitthenoiseinterference tromIgnItionsystemsorothersourcesofpulse-typenoise,A separ.atelimiter controlswitchpermitsoptionaluseofthelimiteronanymodeofoperationwhen pulsetypeinterferenceispresent. AudioFrejuencyAmplifier- Aresistance-coupledamplifiertriodev16Bamplifies theaudio-frequencysignalfromthedetector. Audio Output -TheaudiooutputtoV17istransformer-coupledthrough asplit balancedwindingtodeliver2.0wattsundistortedoutputtoa 600-ohmload.The splitbalancedwindingpermitsbalancingofthedirectkindintheoutputcircuit, asusedforteletypeorsimilarservice.Aseparatesecondary windingprovides attenuatedaudiosignaloutputforheadphoneoperation.This windingwilldeliver anoutputof15milliwattsintoanSOOO-ohmresistiveloadwhenthe600-ohm power secondaryisdelivering500milliwattstoa 600.ohmresistiveload. IFOutput.A cathodefollower,thev16Aprovidesa70-ohmimpedance sourceof intermediatefrequency(455kc)tosocketSO-239ontherearskirtofthechassis. PlugPL-259, andangleplugadapterM-359usedwithcoaxialcableRG-l/Uare notsupplied. Power Supply.Thepower supplyisanintegralpartofthereceiver,Itin- cludestheBrectifierV19and CrectifierV20,togetherwiththeirrespectivelow- passfiltersand VoltageRegulatorv18.Thepowertranformerisprovidedwith screwterminalprimarytaps,coveringa powerlinesource rangeof90to270volts, 50to60ycles.Thepowertransfolerandfiltercomponentsareprotectedbyfuses intheprimaryandplatesupplycircuit. Tuning Meter -Thetuningmeterisused onAVeoperationtoindicatetheaccurac oftuningandtherelativestrengthofrece!vedsignals.DepressionoftheMeter Switchconvertsthemetercircuitfor.indicationofoutputlevelindbfrom6milli- watts. RPGainControland Power Switch TheRFgaincontrolisprovidedformanual controlofsensitivitytopreveerload1ngonsrongsigpalswhenoperatingwith theAVe-MANUALswitchintheMA.iUALllposition.Thiscontrolalsooperateswhenthe switchis-tntheAVel!position.ThePowerON-OFFlIswit!;bisoperatedatthe counter-lockwiseextremityoftheRFgaincontrol. Send-ReceiveSvtch-Thesend-receiveswitchdesensitizesthereceiverbut leavesthepower ouiftoprovideforinstantrecept.ion betweentransmissionperiods. Radiation- Advanceddesignandshieldingofthehighfrequency, second conversiOl crystalandbeatfrequencyoscillatorshasreducedradiationtoanegligiblepoint sothatinterferenceofthisnature,coninmultieaeiverintallations,is reducedtoaminimum. 6. SECTIONIII INSTALLATION Tubes andPacking.Afterunpackingthereceiverseethatalltubesarefirmly intheirsockt6andthatallpackingmaterialisremoved fronlthereceiver. PowerSUB1Y.Makesurethattheprimarytapleadatthebottomofthepower transformersconnectedtothetapwhich mostnearlyagreeswiththe50to60cyclf powersourcevoltage.PowerconnectorplugAN31.0BB.18.3SwithcableclampAN3057-1C withpowercordandplugareJrnishedwtththereceiver. Antenna -Theinputimpedanceattheantennasocket,80-239,isdesignedto match a 95-ohmcoaxialcableline.TheplugconnectorPL.259,andangleplug adapterM-359, sUFpliedwiththereceiver,areforusewithRG.ll/Ucoaxialcable (notsupplied). Speaker -Thespeakershouldbeofthepermanent-magnet dynamic type and should includeaspeakervoicecoilto6oo-ohmline-matchingtranoformerforconnectionto the600-ohmaudiooutputterminalsofthereceiver.Caution:Whenthe6oO-ohmout- putisnotusedconnecta 600.ohm,2-wattresistortotheseterminalstoavoid component damage fromhigbtransientpeakvoltages.Forapplicationsrequiringthe insertionofdirectcurrentcontrolorindicatingvoltages,thejumperconnecting thetwobalancedsectionsofthe600 ohm-outputmayberemoved andtheinsertion circuit,suchasa lowresistancebalancingpotentiometer,connectedinitsplace. Headphones.Eitherhighorlow impedance headphonesmaybeused byplug connectiontothephonejacklocatedatthelowerleftsideofthefrontpanel.The highimpedancetypeisrecommended. Mounting -Thereceiverisdesignedforrackmounting,Topand bottom cover platesaresuppliedformountinginastandard19-ichrack.ThepanelislOt incheshigh.SeeSectionVII,Thereceivershouldbeplacedinapositionwhich permitsthefreeaccessofair. CrystalsforFrequencyControlCrystalsY1toY6arenotsuppliedwiththe receiver,butwillbesuppliedonspecialorderforanysignalfrequencywithinthe rangeoffrom 2to30megacycles.Inordertoinsurecorrectcrystal-controlled frequencyoperation,crystalunitsmaybeorderedfromTHEHAMMARLUNDMFG.CO.INC. Theordershouldspecifythe.!freq.uencyforwhich eachunitistobeused. SeenoteatendofTable5.ToinstaIlcrystalsloosentheknurledthumbscrew on topoftheCrystalControlUnitT34and pushtotherear.Insertthecrystalsin thesocketsBringtheretainerspringassembly forward sothatthespringspress ontopofthecrystalholders,andtightenthethumbscrew.Markthesignalfre- quencyforWhicheachcrystalwasselectedinmegacyclesOlltheplasticchart providedforthispurposealongsidethecrystalswitch82.Pencilorinkmaybe used and canbeerasedifitisdesiredtochangethesefiguresatanytime.The numerals onthechartshouldbeused sothattheyagreewiththenumerals onthe crystalsocketpositions,whicharealsoindicatedbythecrystalselectorswitch. RelayConnections -Ifexternalrelayoperationforthesend-receivefunction isdesired,connectionmaybemndebysolderinga twin conductorcabletothe terminalsoftheSend-ReceivesitchS9.Inthiscase89isleftintheSendorOpen position. AVCand DiodeOutput.Indiversityappltcations,thediversityfeatureis l.ccentuatedbyinterconnectingtheAVe(.)busbetweenreceiversandutiliZinga commonground(G)connection.ThisAVeconnectionismadewhentheIForAFoutpu ofthsystemisusedtoprovidetortheintelligenceduetoaCW,MCW,orfre- quency-shiftsignal;butforvoicesignalsonlytheaudiooutputfrom onereceiver isused.ThisisdonebyremovingtheDIODEOUTPUTjumper on eachreceiverapart from one; and connectingthenegative(-)terminalofeachtothatoftheonewhosc;: terminalsremain Jumpered. IFOutput -TheIFoutputsocket60-239attherearskirtprovidesthesignal at455kcfordiversityreceivingsystemuSe.ConnectorplugPL-259e.ndangleplug adapterM-359(supplied)shouldbeusedwithRG-ll!Ucoaxialcable(notsupplied). Thoutputprovidedtoa 10-ohmresistiveload1s approximately200millivoltsfor normalsensitivity(2microvoltsinputsignal). Master Slave Connections -Indiversityapplicationsthemonitoring requirements imposed ontheoperatoraresevere,butmaybekeptatamlnimbyuseofcommon conversionandbeat-frequencyoscillators.Thentheoperatorneed concernhimself mostlywiththesignallevel1neach channel andthesignaltuningafthereceivers. ToprovideforV-3crystal-controlledfirstheterodyne,and/orv-83.5mc. crystal-controlledheterodyneIand/orV-13 beat-freqUencyoscillatoroutput, respectively,fromthemastertothesluvereceiver,tileHFO)lFO, andBFOsockets 80-239,attherearskirtofeach,furnishedwithplugPL-259,andangleplug adapterM-.359forIFOandBFOonly,a.reinterconnected.lecoaxialcableRG-ll/U suitedforuseisnotsupplied. Withtheredtrontpanelcontrolsineachinstanceononereceiversettoared panelmarking,thatreceiverbecomestheslavereceiver,whereinitsV.3(HFO), V-13(BFO)anditsv-8(IFO)arerenderedinoperative. Remote Connector -TheREMOTEconnectorJ41sfurnishedwith connectorplug AN31oSB-14S-2PandcableclampAN3057-6.lIseterminalsA and BofJ4for connecting alocalexternaltoneSOUlCetomodulate aCWsignaland useterminals eand DofJ4toperformthefunctionoftheCW-MOD6,-11tchbyanothersystempanel switch,1fdesired. 8, SECTIONIV OPERATIO! General BeforeattemptingoperationoftheSP-600-JX11receiver,theoperator shouid thoroughlyfamiliarizehimselfwiththefunctionsand usesofthevarious controls.Whenreferringtothecontrolsinthisdescription,thewordsincapital lettersrepresentthepartofthenameadjacenttothecontrolonthefrontpanel orontherearskirtofthechassisFOrexample,whenreferringtotheSELECTIVITY control,theword,SELECTIVITYicapitalsindicatesthelegend appearingadjacent tothecontrol.Referencetophotographs,Figs.1 and6,issuggested while readingthisdescription.FrontpanelcontrolaanddialsareshowninFi.1 and rearcontrolsandterminalsareshowninFig.6. SelectivitlcontrolTheSELECTIVITYcontrol1s a6-posit1onswitch which selectsthreecrystalandthreenon-crystaldegreesotselect
