Hammarlund_SP-600-J_SP-600-JX_user_1956.pdf

- V,9 ,V.,. , ! GENERALPURPOSE COMMUNICATIONSRECEIVER MODELSP-600-JX AND MODELSP-600-J INSTRUCTIONS MODELSP-600-J TheModel SP-600-J Receiver doesnothave the Frequency Control Unit.Whenthis Instruction Book is usedinconnectionwiththeModel SP-600-J Receiver, all indications inthetext, photographs anddiagrams, with referencetotheFrequency Con. trolUnit,shouldbeignored as theydonotapply. Withthis exceptionthetwo models are identical. ISSUE6 Manufacturedby THEHAMMARLUNDMFG.CO.INC. 460West 34thSt.NewYork1,New York,U.S.A. PrintedinU.S.A. FG. FRONTVIEWOFRECEIVER Sp-600-JXINCABINET Title Technical Summary TABLEOFCONTENTS Page 4 IGeneral Description5 IICircuit Description6 IIIInstallation.7 IVOperation8 VMaintenance.10 VIAlignment16 VIIConversionofTable Model Receiver for Rack Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 TableI-TubeSocket Voltages.14- Table2-TubeSocket Terminal Resistances . .15 Table3-RFandHFOscillator Alignment Frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Table4-Approx.Signal InputsatIF andAFStages.17 Table5-PartsList21 VIIISupplements to cover Models SP,600,jL. SP,600,JLX and SP,600,j25 ILLUSTRATIONS 40 Figure 3 Figure 4 Figure 5 Figure6 Figure 7 Figure 1Front View of Receiver SP,600,JX. in cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Figure 2Block Diagram7 LocationofTubes and Adjustments, . .18 Audio and Overall Fidelity Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Selectivity Curves19 Rear ViewofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Top View of Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 Figure 8TopViewofReceiver-Capacitor Shield and Spare Fuse Cover Removed. . . . . . . . . . . . . . . . . .27 Figure 9Bottom View ofReceiver-TuningUnit Shield Removed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Figure10Bottom ViewofReceiver SP,600,jX,29 Figure11Bottom View of RF Tube Platform,. . .30 Figure12Bottom ViewofFrequency Control Unit:, . . . .31 Figure13Circuit DiagramofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 Figure14Connection Diagram-Receiver Chassis: . . .35 Figure15ConnectionDiagram-TuningUnit.37 Figure16ConnectionDiagram-FrequencyControl Unit.39 3 GENERALPURPOSE COMMUNICATIONSRECEIVER MODEL SP-600-JX TECHNICAL SUMMARY Electrical Characteristics FrequencyRange-total6bands. Band 1. Band 2. Band 3. Band 4. Band 5. Band 6. .54to54.0me .54to1.35mc 1.35to3.45mc 3.45 to 7.40mc 7.40t.14.8mc 14.80 to 29.7me 29.70 to 54.0mc PowerOutput-2.0watts,withlessthan10percentdistortion. OutputImpedanee-600ohmsbalanced split windings. Phonejackwinding; delivers15milliwattstoan8000 ohm resistive load, whentheaudio output to the 600 ohm power load is adjusted to 500 ril.illiwatts. Power Supply Requirements Line Rating95,lOS,117, 130,190,210,234and 260 volt taps, 50,60cycles. Power Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130 watts,1.25amps.at117 volts-maximum. TubeComplement-total20 RF,IFandBFO Amplifiers7-6BA6 HF,2ndConversionandBFO Oscillators,.,3-6C4 Crystal ControlledHFOscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6f.C7 Mixers26BE6 Detector,CBias Rectifier and Noise Limiter1-12AU7 PowerOutput.1-6V6GT Rectifier . . . . .1-5R4GY Voltage Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-OA2 Mechanical Specifications RackModel-Dimensions; 19 inches wide, 10!/z il!ches high and 16!/z inches deep from rack mounting surface.Weight66 lbs. TableModel-Dimensions;21%inches wide,12inches high and17Y8inches deep.Weight87!/z lbs. PerformanceData-(approximate values-takenona sample receiver) Sensitivity is 2.3 microvolts,orbetter, throughouttheentire frequency range, for a signal to noise ratio of 10 db,at20 milliwatts output and withtheRFGain Control at maximum. Image rejection ratios are better than74dbthroughout the frequency range. TheIF rejection ratio at 600 kcis2700 to1. TheAVCaction will maintaintheoutput constant within12db when the input is increased from 2 to 200,000 microvolts. 4 ) GENERAL PURPOSECOMMUNICATIONSRECEIVER I GENERAL DESCRIPTION TheSP,600,X is a 20 tube Radio Communications Receiverwithself contained power supply.TheJ suffix inthemodel number denotesthatthis receiver is made using components having characteristics which aretheequivalentofmilitary component specifications insofarasis practicable. Thereceiver is supplied in either a well ventilated steel, table model cabinet finished in dark greyto complementthelighter grey front panelorfor mount ing in a standard 19 inch relay rack. Theself contained power supply is designed for operation from a single phase, 50to60 cycle alternat ing currentpowersource.Thepower transformer primaryisprovidedwithtaps covering a line voltage range from 90to270 volts.Thepower consumption is 130 watts. Thereceiver is suitable for either headphoneor loudspeaker receptionofAMradio telephone,CW telegraph,AMMCWtelegraphsignalsandfor diversity applications. Thestandard model provides continuous coverage oyer a frequency range from 0.54 to 54.0 megacycles in six bands.Thelarge easily operated band change control knob,onthefront panel, selectsthedesired frequencybandand a band indicator visiblethrough a small front panel window indicatesthefrequency band in use.Thiscontrol also alignsthedial frequency indicatorwiththeproper dial scale. Inadditiontothefrequency scales,themain dial hasanarbitrary scale whichinconjunction withthe vernier dial provides continuous expanded scales over each frequency band for extremely accurate logging andresetability. Thesingle tuning control is largeandofspecial design to permit maximum traverse speed as well as exceptional operating ease.Itcontrolsboththe main andvernier dials.Ananti,backlash gear train provides extremely close calibration accuracyandcompletely accurate resetability. A tuning lock provides positive locking actionwithoutaffectingthefrequency setting. Thetuning ratio fromthetuning control tothe main dial is 50to1andtheratio fromthevernier dial tothemain dial is 6 to1. Twostagesofradio frequency amplification are provided on all bands. Single conversion is used for signal frequenciesupto 7.4meanddouble conversion, employing a crystal controlled oscillator, for signal frequencies above 7.4mc.Four stagesofIF amplifica tion, detectorandAVCrectifier, noise limiter and meter rectifier, beat frequency oscillator and buffer 5 amplifier,IFoutput,AFamplifier andoutputpower stage are provided. Thefrequencycontrolunitprovidesforfixed channel crystal controlled operation on any six fre, quencies withintherange from .75 to 54mc.Front panel controls permit the selectionofthenormal high stability continuously variable tuningoreitherofthe six selected fixed frequency signals. For crystal con trolled fixed channel operationitisonly necessary to setthedial tothesignal frequency, switch tothe crystal frequency desiredandtune withthedelta frequency control.These crystals are not supplied with the receiver,butmay be purchased on special order fromHAMMARLUNDMFG. CO. specifying the signal frequency for which each is to function. Thenoise limiter circuit effectively limits the inter ferencfrom ignition systemsorothersourcesofpulse type noise.Thelimiter switch permits optional use ofthelimiter. Theantenna input circuitisdesigned for use with a balanced line.Theinputimpedance is nominally 95ohms.Thereceiver may also be operated with a conventional single wire antenna. Theaudio output circuit is designed for a 600 ohm loadorline and is provided with a four terminal split winding for balanced load operation. Maximum power outputisapproximately 2.0 watts.Theheadphone circuitwhenreferred toan8000 ohm load provides signals attenuated approximately15db belowthe600 ohm power output. Thesend receive switchdesensitiesthereceiver butleavesthepower ontoprovide for instant recep tion between transmission periods. Radiationisnegligibleandcomplies with require ments for shipboard operation and for multi,receiver installations. Frequency drift after a15minute warm. up period, ranges between .001 percent and.01percentoffre que1,1cydepending onthefrequency used.Thisisa very unusual degreeoffrequency stability for variable tunedHFoscillators and closely approaches crystal stability. Theselectivity control provides three degrees of crystal and three degreesofnoncrystal selectivity ranging from sharp (.2 kc) to broad (13.0 kc).The crystal filter embodies the same circuit fzaturesthat have provedsoeffectiveanddesirable in Hammarlund SuperProReceivers, incorporated in an improved mechanical design. II CIRCUIT DESCRIPTION General-Thecircuit is shown schematicallyin Figure 13. A block diagram, Figure 2, is providedto more clearlyshowthearrangementandfunctionsof thevarious circuit sections.Thelocationofthevarious tubes isshownin Figure3.Thecircuit,forsingle conversion, usedforsignal frequenciesupto7.4 mc consistsoftwostagesofRFamplificationY,land Y2,FirstMixerY5,FirstHeterodyneOscillatorY4, fourstagesofIFamplificationY7,Y9,Y,toand Yl1,DetectorandAYCrectifierY14,Noise Limiter Y15,Beat Frequency OscillatorY13,IFoutputand AFamplifierY,16,AandY,16,B,OutputPowerstage Y,17andthePowerSupplysystem which includes BPowerRectifierY19,C Bias RectifierY,20and Voltage Regulator Y,18. Inthecircuitfordouble conversion, usedforsignal frequencies above 7.4 mc,theSecond MixerY,6and SecondHeterodyneOscillatorY,8are substitutedfor theGatetubeY7. InputCoupling-Theantennacoupling is designed to provide optimum coupling from a95ohmtrans mission line.A balanced doubletorstraight wire antennamaybeused. RFAmpli1ier -Aningeniously designedrotary turretis employedtochange bandsandtoplacethe coil assembliesoftheRFamplifierV,1andY2,Mixer Y,5andFirstHeterodyneOscillatorY,4stages di, rectly adjacenttotheirrespective sectionsofthefour gangtuningcapacitorandtheirrespective tubes.This assures maximum sensitivityathighsignaltonoise ratio. FirstHeterodyneOscillator-(YariableY.4)- Therotaryturretbandchange switch, advanced de signofthefourgang,twinsection, variabletuning capacitorandruggedconstructionthroughout,pro vide frequency stabilityanddial calibration accuracy toa previously unattained degree. FirstHeterodyneOscillator -(Crystal Controlled V.3)-Forservices requiring extremely stable, fixed frequency operation, a crystal controlled high fre, quencyoscillator is provided.Instantchangeover from variabletocrystal controlled oscillatorwitha choice ofsix crystal positions, is effectedbyafrontpanel control. A secondfrontpanel control permits adjust, mentofthecrystal oscillator frequency over a plus orminus .005percentrange. intennediateFrequency Ampli1ier -Single conver sionto455 kc is employedforsignal frequencies below 7.4 mc.TherearefourstagesofIFamplification incorporatingtheHammarlundpatentedcrystal filter circuit. Six positionsofselectivity provide 6dbband, widthsof.2, .5, 1.3, 3, 8, and13kc.Onthethree narrowerbandwidthpositions,thecrystal filter is in operation.Thecrystal phasing control providesex treme selectivityforthehighattenuationofclosely adjacent interfering signals. Double conversion is employed for signal frequen cies above 7.4 mc.Thesignalisheterodynedto3.955 mcbytheFirstMixerY,5andHeterodyne Oscillator Y,4orY,3forhigh image rejection.The3.955 mc signal isthenheterodynedto455 kcbytheSecond MixerY,6andthe3.5 mc Fixed Crystal Controlled OscillatorY8,for selectivity. DetectorandAVC-TheY,14tubeis usedasa highlevel DetectorandAYCRectifier.TheAVC circuitisprovidedwithseparatetimeconstants forCWandMCWoperation.AYCandDiode outputterminals provide for connections in diversity applications. Beat Frequency Oscillator-Thebeatfrequency oscillator employs ahighcapacity Colpitts circuit which gives a highorderoffrequency stabilityand minimizes oscillator harmonics.Thebeat frequency OscillatorY13,is coupled intothedetector circuit throughBuffer Amplifiery,n,whicheliminates oscil, latorlock,inandpermits variationofthebeatoscillator injection by meansofa control locatedontherearof thechassis.AfrontPanel control variestheaudio beat frequency, from zero beattolusorminus 3 kc. NoiseLimiter-Thenoise limiter .circuitY15, limitsthenoise interference from ignition systemsor othersourcesofpulsetypenoise. A separate control sYitch S6, permits optional useofthelimiteronany modeofoperationwhenpulse type interference is present. AudioFrequency Amplifier -A resistance coupled amplifier triode Y,16,B, amplifiestheaudio frequency signal fromthedetector. AudioOutput-TheaudiooutputtubeY17,is transformer coupledthrougha split, balanced winding todeliver 2.0 wattsundistortedoutputtoa 600 ohm load.Thesplit balanced winding permits balancing ofthedirect current intheoutputcircuit, as used for teletypeorsimilar service. A separate secondary wind, ingprovides attenuated audio signaloutputfor head phoneoperation.Thiswinding will deliver an output of15milliwattsintoan 8000ohmresistive load when the(OOohmpower secondaryisdelivering 500 milli, wattstoa 600ohmresistive load. IFOutput-Acathode followerY,16,Aprovides a 70ohmimpedance source of intermediate frequency (455 kc)tosocket, SO239,ontherear skirtofthe chassis. A PL,259 plugandRG,I1/Vcable,notsup plied, are usedforthisconnection. PowerSupply-Thepower supplyisan integral partofthereceiver.ItincludestheB rectifierY,19 andtheC rectifier V,20, together with their respective low pass filtersandtheVoltage RegulatorY18.The power transformerisprovidedwithscrew terminal primary taps, covering a power line source rangeof 90 to 270 volts, 50to60 cycles.Thepowertrans formerandfilter components are protectedbyfuses intheprimaryandplate supply circuits. 6 ,. TuningMeter-Thetuning meterisused on AVC operation to indicatetheaccuracy of tuning andthe relative strengthofreceived signals.Depressionof theMeter Switch convertsthemeter circuit for indica- tionofoutput level in db from 6 milliwatts. RFGain ControlandPower Switch -TheRFgain controlisprovided for manual control of sensitivity to prevent overloading on strong signalswhenop- erating withtheAVC-MANUALswitch inthe MANUALposition.Thiscontrol also