Hammarlund_SP-600-J_SP-600-JX_user_Oct_1952.pdf
ISSUE4-OCTOBER1952 , GENERALPURPOSE COMMUNICATIONSRECEIVER MODELSP-600-JX AND MODELSP-600-J INSTRUCTIONS MODELSP-600-J TheModel SP-600-J Receiver doesnothavethe FrequencyControlUnit.Whenthis Instruction Bookis usedinconnectionwiththeModel SP-600-J Receiver, all indicationsinthetext,photographs anddiagrams,withreferencetotheFrequencyCon. trolUnit,shouldbeignored astheydonotapply. Withthis exceptionthetwomodels are identical. ISSUE4 Manufacturedby THEHAMMARLUND MFG. CO. INC. 460West34thSt.New York1,New York,U.S.A. PrinldinU.S.A. FG. FRONTVIEWOFRECEIVER Sp-eOO-JXINCA81NET Title TechnicalSummary TABLEOFCONTENTS Page 4 IGeneralDescription5 IICircuitDescription6 IIIInstallation7 IVOperation8 VMaintenance10 VIAlignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 VIIConversionofTableModelReceiver forRackMounting,20 TableI-TubeSocketVoltages.14 Table2-TubeSocketTerminalResistances.15 Table3-RFandHFOscillatorAlignmentFrequencies; . . . .17 Table4-Approx.SignalInputsatIFandAFStages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Table5-PartsList21 ILLUSTRATIONS Figure Figure2 Figure3 Figure4 Figure5 Figure6 Figure7 Figure8 Figure9 Figure 10 Figure11 Figure12 Figure13 Figure 14 Figure15 Figure16 FrontViewofReceiver SP-600X,incabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Block Diagram7 LocationofTubesandAdjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . .18 AudioandOverall FidelityCurves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 SelectivityCurves19 RearViewofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 TopViewofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 TopViewofReceiver-CapacitorShield and Spare FuseCoverRemoved. . . . . . . . . . . . . . . . .27 BottomViewofReceiver-TuningUnitShieldRemoved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 BottomViewofReceiverSP600X,. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 BottomViewofRFTubePlatform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 BottomViewofFrequencyControlUnit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 CircuitDiagramofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 ConnectionDiagram-ReceiverChassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 ConnectionDiagram-TuningUnit., .37 ConnectionDiagram-FrequencyControlUnit.39 3 GENERAL PURPOSECOMMUNICATIONSRECEIVER MODEL SP-600-JX TECHNICALSUMMARY Electrical Characteristics FrequencyRange-total6bands. Band1. Band2. Band3:. Band4. Band5. Band6:. .54to54.0mc .54to1.35 me 1.35to3.45 mc 3.45to7.40 mc 7.40to14.8 me 14.80to29.7 me 29.70to54.0 mc PowerOutput-2.0watts,withlessthan10percentdistortion. OutputImpedance-6OOohms-balanced split windings. Phonejack-winding;delivers15milliwattstoan8000ohmresistive load,whentheaudiooutputtothe 600ohmpowerload isadjustedto500 milliwatts. Power Supply Requirements Lil.lting.95, 105, 117, DO,190,210,234and260 volt taps, 5060 cycles. PowerConsumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130watts,1.25 amps.at117volts-maximum. TubeComplement-total20 RF,IFandBFOAmplifiers7 -6BA6 HF,2ndConversionandBFOOscillators3 -6C4 CrystalControlledHFOscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 -6AC7 Mixers2 -6BE6 Detector,cBias RectifierandNoiseLimiter 19incheswide,IOYzincheshighand16/z inches deep from rack mounting surface.Weight66 lbs. TableModel-Dimensions;21%inches wide,12incheshighand1718 inches deep.Weight87/z Ibs. PerformanceData-(approximatevalues-takenona sample receiver) Sensitivity is 2.3 microvolts,orbetter,throughouttheentirefrequencyrange, for a signaltonoise ratioof 10db,at20milliwattsoutputandwiththeRFGainControlat maximum. Imagerejection ratios arebetterthan74dbthroughoutthefrequencyrange. TheIFrejection ratio at 600 kc is 2700 to1. TheAVCaction will maintaintheoutputconstantwithin12dbwhentheinputis increased from 2to 200,000 microvolts. 4 ) GENERAL PURPOSECOMMUNICATIONSRECEIVER I GENERAL DESCRIPTION TheSP-600-Xisa20tubeRadio Communications Receiverwithselfcontainedpowersupply.The suffix inthemodelnumberdenotesthatthisreceiver is made usingcomponentshavingcharacteristicswhich aretheequivalentofmilitarycomponentspecifications insofaras is practicable. Thereceiver is suppliedineithera well ventilated steel, table model cabinet finished in dark greyto complementthelightergreyfrontpanelorformeunt- inginastandard19inchrelay rack. Theselfcontainedpowersupply is designedfo operationfroma single phase, 50to60 cycle alternat- ingcurrentpowersource.Thepowertransformer primaryisprovidedwithtaps covering a line voltage rangefrom90to270volts.Thepowerconsumption is 130 watts. Thereceiver is suitableforeitherheadphoneor loudspeaker receptionofAMradio telephone,CW telegraph,AMMCWtelegraphsignalsandfor diversity applications. Thestandardmodel provides continuous coverage overa frequencyrangefrom 0.54to54.0 megacycles in six bands.Thelarge easily operatedbandchange control knob,onthefrontpanel, selectsthedesired frequencybandandabandindicatorvisiblethrough a smallfrontpanelwindowindicatesthefrequency bandin use.Thiscontrol also alignsthedial frequency indicatorwiththeproperdial scale. Inadditiontothefrequencyscales,themain dial hasanarbitraryscalewhichinconjunctionwiththe vernierdial providescontinuousexpandedscalesover each frequencybandforextremely accurate logging andresetability. Thesingletuningcontrolis largeandofspecial designtopermitmaximumtraversespeed as well as exceptionaloperatingease.Itcontrolsboththemain andvernierdials.Ananti-backlash geartrainprovides extremely close calibration accuracyandcompletely accurate resetability. Atuninglock provides positive locking actionwithoutaffectingthefrequency setting. Thetuningratiofromthetuningcontroltothe main dial is 50to1andtheratiofromthevernier dial tothemain dial is 6to1. Twostagesofradiofrequencyamplification are provided on all bands.Single conversion is usedfor signal frequenciesupto7.4 mcanddouble conversion, employing a crystal controlled oscillator,forsignal frequencies above 7.4 me.FourstagesofIFamplifica- tion,detectorandAVCrectifier, noise limiterand meterrectifier,beatfrequencyoscillatorandbuffer 5 amplifier,IFoutput,AFamplifierandoutputpower stage are provided. Thefrequencycontrolunitprovidesforfixed channelcrystal controlled operationonanysix fre- quencieswithintherange from .75to54 mc.Front panel controlspermittheselectionofthenormalhigh stability continuously variabletuningoreitherofthe six selected fixed frequency signals.Forcrystal con- trolled fixed channeloperationitisonlynecessary to setthedial tothesignal frequency, switchtothe crystal frequency desiredandtunewiththedelta frequency control.Thesecrystals arenotsupplied withthereceiver,butmay be purchasedonspecial orderfromHAMMARLUNDMFG.CO.specifying thesignal frequencyforwhicheach istofunction. Thenoise limiter circuit effectively limitstheinter- ference from ignition systemsorothersourcesofpulse typenoise.Thelimiter switch permits optional use ofthelimiter. Theantennainputcircuit is designedforusewith a balanced line.Theinputimpedanceisnominally 95 ohms.Thereceiver may alsobeoperatedwitha conventional single wire antenna. Theaudiooutputcircuit is designedfora 600ohm loadorlineandis providedwithafourterminal split windingforbalanced load operation.Maximumpower outputis approximately 2.0 watts.Theheadphone circuitwhenreferredtoan 8000ohmload provides signalsattenuatedapproximately15dbbelowthe600 ohmpoweroutput. Thesend receive switch desensitizesthereceiver butleavesthepowerontoprovideforinstantrecep- tionbetween transmission periods. Radiation is negligibleandcomplieswithrequire- mentsforshipboard operationandformulti-receiver installations. Frequencydriftaftera15minutewarmupperiod, ranges between .001percentand.01percentoffre- quency depending onthefrequency used.Thisis a very unusual degree of frequency stabilityforvariable tunedHFoscillatorsandclosely approaches crystal stability. Theselectivity control providesthreedegreesof crystalandthreedegreesofnon-crystal selectivity rangingfromsharp(.2 kc)tobroad(13.0kc).The crystal filter embodiesthesame circuit featuresthat haveprovedsoeffectiveanddesirable inHammarlund SuperProReceivers, incorporated in an improved mechanical design. II CIRCUIT DESCRIPTION General-Thecircuit isshownschematically in Figure 13. A block diagram, Figure 2, is providedto moreclearlyshowthearrangementandfunctionsof thevarious circuit sections.Thelocationofthevarious tubesisshowninFigure3.Thecircuit,forsingle conversion, usedforsignal frequenciesupto7.4 me consistsoftwostagesofRFamplificationV-Iand V-2, FirstMixerV-5,FirstHeterodyneOscillator V-4, fourstagesofIFamplification V-7, V-9, YolOand Vll,DetectorandAVerectifier V-14, Noise Limiter V-IS,BeatFrequencyOscillatorV-l3,IFoutputand AFamplifierV-16-AandV-16-B,OutputPowerstage V-17andthePowerSupplysystemwhichincludes BPowerRectifierV-19,C Bias Rectifier V-20and VoltageRegulatorV-18. Inthecircuitfordoubleconversion, usedforsignal frequencies above 7.4 me,theSecondMixerV-6and SecondHeterodyneOscillatorV-8aresubstitutedfor theGatetubeV-7. InputCoupling-Theantennacoupling is designed toprovideoptimumcoupling from a95ohmtrans- mission line.Abalanceddoubletorstraightwire antennamaybeused. RFAmplifier -Aningeniouslydesignedrotary turretisemployedtochangebandsandtoplacethe coil assembliesoftheRFamplifierV-IandV-2,Mixer V-5andFirstHeterodyneOscillatorV-4stages di- rectlyadjacenttotheirrespective sectionsofthefour gangtuningcapacitorandtheirrespective tubes.This assures maximum sensitivityathighsignaltonoise ratio. FirstHeterodyneOscillator -(VariableV-4)- Therotaryturretbandchangeswitch, advanced de- signofthefourgang,twinsection, variabletuning capacitorandruggedconstructionthroughout,pro- videfrequencystabilityanddial calibration accuracy toa previouslyunattaineddegree. FirstHeterodyneOscillator -(CrystalControlled V-3)-Forservicesrequiringextremely stable, fixed frequencyoperation, a crystal controlledhighfre- quencyoscillator is provided.Instantchangeover from variabletocrystal controlled oscillatorwitha choice ofsix crystal positions, is effectedbyafrontpanel control. A secondfrontpanel control permits adjust- mentofthecrystal oscillator frequencyovera plus orminus .005percentrange. IntermediateFrequencyAmplifier -Single conver- sionto455 kc is employedforsignal frequencies below 7.4 me.TherearefourstagesofIFamplification incorporatingtheHammarlundpatentedcrystal filter circuit. Six positionsofselectivity provide 6dbband- widthsof.2, .5, 1.3, 3, 8,and13kc.Onthethree narrowerbandwidthpositions,thecrystal filter is in operation.Thecrystalphasingcontrol provides ex- treme selectivityforthehighattenuationofclosely adjacentinterferingsignals. Double conversion is employedforsignal frequen- cies above 7.4 me.Thesignalisheterodynedto3.955 mebytheFirstMixerV-5andHeterodyneOscillator V-4orV-3forhighimage rejection.The3.955 me signal isthenheterodynedto455 kcbytheSecond MixerV-6andthe3.5 me FixedCrystalControlled Oscillator V-8,forselectivity. DetectorandAVC-TheV-14tubeisused as a high levelDetectorandAveRectifier.TheAVC circuitisprovidedwithseparatetimeconstants forCWandMCWoperation.AveandDiode outputterminals provideforconnections in diversity applications. Beat Frequency Oscillator -Thebeatfrequency oscillator employs ahighcapacity Colpitts circuit whichgives ahighorderoffrequency stabilityand minimizes oscillator harmonics.Thebeatfrequency Oscillatorvon,is coupled intothedetectorcircuit throughBuffer Amplifier V-12,whicheliminates oscil- lator lock-inandpermits variationofthebeatoscillator injectionbymeansofa control locatedontherearof thechassis.AfrontPanelcontrolvariestheaudio beatfrequency, from zerobeattoplusorminus 3 kc. Noise Limiter -Thenoiselimiter circuitV-IS, limitsthenoise interference from ignition systemsor othersourcesofpulsetypenoise. A separate control switch 5-6, permits optional useofthelimiteronany modeofoperationwhenpulsetypeinterference is present. AudioFrequency Amplifier -A resistance coupled amplifier triode V-16-B, amplifiestheaudio frequency signal fromthedetector. AudioOutput-TheaudiooutputtubeV-17, is transformercoupledthrougha split, balancedwinding todeliver 2.0watts undistortedoutputtoa 600ohm load.Thesplit balanced winding permits balancing ofthedirectcurrentintheoutputcircuit, as usedfor teletypeorsimilar service. A separate secondary wind- ing provides attenuated audio signaloutputforhead- phoneoperation.Thiswinding will deliver anoutput of15milliwatts into an 8000ohmresistive loadwhen the600ohmpowersecondary is delivering 500 milli- wattstoa 600ohmresistive load. IFOutput-A cathode followerV-16-Aprovides a 70ohmimpedance source of intermediate frequency (455 kc)tosocket,SO-239,ontherearskirtofthe chassis. A PL-259 plugandRG-ll/Ucable,notsup- plied,areusedforthisconnection. PowerSupply-Thepowersupplyisan integral partofthereceiver.ItincludestheB rectifier V-19 andthee rectifierV-20,togetherwiththeirrespective low pass filtersandtheVoltageRegulatorV-18.The powertransformerisprovidedwithscrew terminal primary taps, covering a power line source rangeof 90to270 volts, 50to60 cycles.Thepower trans- formerandfilter components are protectedbyfuses intheprimaryandplate supply circuits. 6 TuningMeter-ThetuningmeterisusedonAYC operationtoindicatetheaccuracyoftuningandthe relativestrengthofreceived signals.Depressionof theMeterSwitchconvertsthemeter circuitforindica- tionofoutputlevel indbfrom 6 milliwatts. RFGainControlandPowerSwitch -TheRFgain control isprovidedformanual controlofsensitivity topreventoverloadingonstrong signalswhenop- eratingwiththeAYC-MANUALswitchinthe MANUALposition.Thiscontrolalsooperates whentheswitch is intheAYCposition.The PowerON-OFFswitch isoperatedatthecounter- clockwiseextremityoftheRFgain control. 3.5mc CRYSTAL CONTROLLED Send-ReceiveSwitch-Thesend-receive switch de- sensitizesthereceiverbutleavesthepoweronto provideforinstantreceptionbetweentransmission periods. ConvenienceOutlet-A convenience power outlet is providedontherearofthechassisfortheconnec- tionofan accessorysuchas a lamporelectric clock. Radiation -Advanceddesignandshieldingofthe highfreque
