Hammarlund_SP-600-JX_user_1951.pdf
GENERALPURPOSE COMMUNICATIONSRECEIVER MODELSP-600-JX INSTRUCTIONS ISSUE2 - MARCH1951 Manufacturedby THEHAMMARLUNDMFG.CO.INC. 460West34thSt.New York1,New York,U.S.A. GENERALPURPOSE COMMUNICATIONSRECEIVER MODELSP-600-JX INSTRUCTIONS ISSUE2 -MARCH1951 Manufacturedby THEHAMMARLUND MFG.CO.INC. 460West34thSt.New York1,New York, U.S.A. PrintedinU.S.1. FIG 1 FRONTVIEW. SP-600-JXINOFCRECEIVER ABINET 2 TABLEOF CONTENTS Title T1:chnicalSummary General Description IICircuit Description IIInstallation. Page , 5 6 8 IVOperation and DescriptionofControls. VMaintenance. VIAlignment. VIIConversionofTableModel Receiver for RackMounting. TableI-TubeSocket Voltages. Table2-Tube Socket Terminal Resistances. Table-RFandHFOscillator Alignmcm fro:quencics. Table4-Approx.SignallnputsatIF andAFSt;ICS. Table5-PartsList ILLUSTRATIONS 9 12 16 10 II 13 II 17 Figure Figure2 Figure Figure, Figure5 Figure6 FIgure7 FIgure8 Figure9 Figure 10 FigureII FIgure12 Figure I:; Figure14 Front ViewofReceiver SP600jX, incabinet. BlockDiagram LocationofTubesandAdjustments. Audioand Overall FidelityCurves. SelectivityCurves Rear VicwofReceiver. TopViewofReceiver. TopVio:wofReceiver-eapacirorShield Removed. BoHomViewofReceiver SP600-JX. BoHom ViewofReceiver-TuningUnitShield Removed. Circuit DiagramofReceivcr. ConnectionDiagram-RecclverChassis. ConncctiOnDiagram-TuningUnit. ConnectionDiagram-FrequencyControlUnit. 2 7 I 14 15 20 21 23 24 25 27 29 JI 3 .54to54.0 me .,54to1.3.5mc 1.3.5toi,45mc i.45to7.0mc 7,40to14.8mc .80to29.7mc 29.70to.504.0me 7-68A6 .-6C. 1-6AC7 2 -68E6 J-6ALS 1-12AU7 1-6V6CT 1-5R4CY 1-OA2 GENERALPURPOSECOMMUNICATIONSRECEIVER MODELSP-600-JX TECHNICAL SUMMARY Electrical Characteristics FrequencyRange-cotal6 bands. BandI. Band 2._. Band. Band-4. Band5. Band 6. MaximumUndistorlWOutput-approximate-2.5waUS. OutputImpedance-600ohms-balanced split windmgs. Phonejack-winding: delivcrs1.5milliwatts to iln8000ohmresistivc 10ild,whentheiludiooutputtothe 600ohmpower lood is adjustedto.500milliwalt5. PowerSupplyRequirements LineRating_. . . . . . . . . .95, 105, 117, DO, 190, 210, 234OInd260 volt tilpS, 50-60cyeln. PowerCOIl5lmpuon.130 watts. 1.25 ilrnpt. ilt 117 vol1$-mill:irnum. Tube Complement- total20 RF, fFandBFOA.mplifiers._. HF,2ndConversIOnandBFOO.scillillors,. Crystal ControlledHFOscillator._. Mi:ters._. Detector,CBiasRectifierandNoise Limiterll frequcn.:y buffer ;lmplifier. IFoutput,A.Fampli- fier andoutputpowcrstage.Thedrcuitfor double cOllversion. employed for frequencies abo!: 7.4 mega cycles, include,; a secondm;lI:crand a second hetero- dynecrystal controlled oscillator.Thepower supply system includes a B powor rectifier, C bias rectifier and ,Ivoltage regulator_ Thefrequency control unit provides for fixed chan- nel crystal controlled operation on any six frequencies chosen withintherangeofthero.:ceivcr.Front panel comrols permitthesele.:tionofthenormalhig:hstabil- ity continuously variahle lUningoreitherofthesix selected fixed fretjuency signals. F(lr crystal controlled fixed channc1l)pcr:Hion itisonly nl:ccssary to setthe dial tothesignal frequency, switchtothecrystal fre- quency desired andtuncwiththedelt,1frequencycon trol.Nl) retuningofthemaintuningis necessaryor desirable,whenswit.ching (romVFOto crystal opera tion forthesame signal frequency.Thesecrystals arc not supplied withtherCCclvl:f,butshnuld be pur- chasedonspecialorderfromHAMMARLUND MFG.CO.specifying:thesignal frequency for which Itistil (unction. Thetwo scaletuningmeter11I1rm.dlylIlclk,ltesthe rdativestrengthofther.:ccived signalindbfrom1 microvolt, whenoperatcdon AVC;110withtheRF g;lin cOlltrol ;ll maximum.A re,lr .:ontrolisprovided for adjl.1stmcnt attheplus 20dbscale reading with an RFsignalinputof10mi.:rovolts.011depressionofthe panel meter switchthelower scaleofthemetcr indi- catestheaudiooutputpower levelindbfrom 6 milli watts.A rear controlisprovided for adju.stlOentof the0dbreading. TheAVCcircuitisprovidedwiths.:par:ltc time constants forCWandMew(lperatioll.Thebeat fre- quency oscillator employs a hIgh cap,lClty Colpitts cir- cuit which gives a highordcroffrcquency stability andminimizes oscill:llOr harmonics.Thebeatfre- quency oscillator vollageisintroduced intolhedc- tcctorthrougha buffer amplifier whicheliminat.es oscillator lock-in.Thisfeature mdkcsitpossible to tunesignals sharplyto:crobeatandpermitsthein- dusionoftherear control for ;adjustinethebeat ascii lator lIlJecriontosuitopcr.umfZ.:onditions.A front fUnd control variestheaudioIx.tfrequency from 0 to plusorrnmU53 KC. Thennilimiter circuit effectively hmitstheinter ference from ic:nition systemsorother.soUft:esofpulse typenOI.ThehmitcrSWItchpermits optional usc of the hmlter. Theantenna inputcirCUliisduiJ,.:ned forUSl:wuh a halanccdIme.Thcmput ImpedanccISnominally 100 ohms.Thereceiver may alsobeoperated with;a COnventionalSTOgiewire antcnn,l. TheaudIOoutputcircULtIStleIJ:JH:dfor a 600 ohm load (lrIllleandisprovided with a four terminal spilt wllldlrlforbalancedload oper-ttiOIl.Undlstoncd power outputISapproll:imatcly2.5W;lttl!.Thehead phone circuit whell referredto;1I1ROOO(111mload pro- videssinals;tlcnuated apprOll:imatcly15dl:-helow the 600 ohm power output. AnRFf!ainconlrolisprovided forthemanualCOil trolofsensitlvityIntheprescnceofstrong signals and tlper-lles on eitherMANUALorAye. Thescndrc:CIO:switchdl:5Cnltl:esthereceiver butIc,Ixcsthepoweronto provide for mstant recep tlontwccntransmissIOn pcmx!s.A re,lrre.:eptIl.:le proVides for the connectiunufan external rela) Radiationisnegligible :lIld complies withrequir ments for .!lhlpboardOflCr:lIIOnand for multirccclwr insullations. Frequency drift after aISmlllute warm up pcmx). ranges between.001percent and.01pcr.:enr of fre- quency depending onthefrequency u$:d.ThisISa vcry unusualdCj.!fCeoffrequency stability for an,lble tunedHFoscillators anddosdappro.1.chcs crystal .!ltabllity. Theselectivity control proides three degrecs of crystal and three degreesofnOllcryst:11.selectivity ranging from sh;trp (.2kc)tl)broad (13.KC).The crystal tiltcr embodiestheS,IIllCCircuit fealures that have provcd so effectiveOInddeSIrableillHammarlund SuperProRecei.:rs. incorporatedinan improvcd mechanical design. II CIRCUIT DESCRIPTION Gtntral-Thecircuitisshown schem;atie:tlly in Figure11.A block diagram. Figure 2. is provided to more deilfly show he arranflemen and functionsof thevarious Circuit sections.Thelocatlonofthevan ous tubesisshown in FigureJ.Thecircuit, for single conversion. used for sienal frequencies up07.4me consistsoftwo staJtesofRF amplificationVIand Y2. FirstMotUY,S. First Heterodyne Oscillator Y-4. four stagCllofIFamplificationY?,Y9.YIO andY-li, Detector andAyerectifierYH.Noise Limiter Y15. Beat Frequency OscillatorY-n.IF output :mdAF amplifierY16Aand Y-16-B. OutpUt Power stage YJ?and the Power Supply system which includes B Power Rectifier Y-19,eBias RectifierY20andYoh age Regulator V-JB. In the circuit for double convcrsion. used fnr signal frequencies above7.4me. the Second MixerY6and Second Heterodyne Oscillalor YS are substituted for the Gate tube Y-? Input Coupling -Theantenna couplingisdesigned to provide optimum coupling from;a100 ohm trans miMionIme. A M.laneed doubletorstraight wirean tenna maybeused. RFAmplifiu-Aningeniously designedrotary lurretisemployed to change bands and to place the COlias-mbliesoftheRFamplifierYIandYl,Mixer Y5 and First Heterodyne Oscillator V4 stages di rectly adjacent to theirrespeetivSC.:tl(1115ofthefour gang tuning capacitor and their respective tubes. ThiS assures maximum sensitivity at high signal to noise ratio. FirsfHeterodyneO.scil1ator_ (VariableV4)- Therotary turret band change swilch, advanced de Signofthe four gang, twm section. anable tunlllg capacitor andrugedconstruction throughout. pro Videfrequency stability and dial calibration accuracy to a previously unattained degree. First Heterodyne Oscillator -(Crystal Controllrd V.j)_For services requmng extremely stable.fixed frequency operation. a crystal controlled high fre queney oscillatorisproVided. Instantchneoverfrom variable to crystal controlled oscillator. with a choice ofsiltcrystal positions.iseffected by a front panel con trol. A .second front panel control permits adjustment ofthecrystal oscillator frequency over a plusOfminus .005 percent range. Intermediale Frequency Amplifier -Single cOllver sion to4S5kcisemployed for signal frequencies be low7.4mc.Therearc four stages of IF ampltfication incorporatingtheHammarlund patented crystal filter circuit. Six positionsofscletivltyprOVIde6 db band widthsof2.5,1.3.:.Sand13kc.Onthe thre.: narrower bandwidth positions, th.:cry9.,1filtaISIII IIpcratlQlThe.:rystalphfQne;n .59pot!fGIfrfll1ICjobG;.7.4 b.o.7.4me switch S-6, permits optional useofthe limiter on an) mode of operation when pulse type interferenceis present. Audio Frequency Amplifier -A resistance coupled amplifier triode Y16-B. amplifies thc audio frequency signal from the detector. AudioOUfpul-Theaudiooutputtube Y17.is transformer coupled through a split. balanccd wind:ng todeliver2.5watts undislOrted output to a 600 ohm load.Thesplit balanced winding pcrmilS balancingof the direct currelltinthe Output circuit,asused for teletypeorsimilar service. A separate secondary wllld ing provides attenuated audio signal output for head- phone operation.Thiswindingwilldeliveranoutput of15milliwatts inro an 8000 ohm resistive load when the 600 ohm power secondaryisdelivering 500 milli watts to a 600 ohm resistive load. IFOutpul-A cathode follower Y-16A provides a low impedance source of intermediate frequency (455 Kc) signaltothe connector on the rear skirtof the chassis. 7 RF Gain Control and Power Switch -TheRF gain controlisprovided for manual controlofsensi ti.ity to prevent overloading on strong signals when opcratin2 withtheAYCMANUA.Lswitchinthe MANUALposition.Thiscomrolal.sooperates when the switchisintheAVCposition.ThePower ON-OFFswitchisoperated at the counter-clockwise extremityofthe RF gain control. SendReceive S.itch -Thesend-receive switch dc scnsitizes the receiver but leaves the poweronto provide forinstantreceptionbetween transmission periods.A rl!ceptacleisprovided on the rearofthe receiver for the extental connectionofa relay. Convenience Outlel -A cOllvenience pOwcr outlet i1providedonthercarofthe chassis fortheconnec tionofan :lccessory such as a lamporelectric clock. Radiation -Advanced design and shieldingofthe high frequency, second conversion crystal and beat frequencyoscillators hasreducedradiatiolltoa negligible point sothatinterferenceofthis nature, common in multireceiver installations,isreduced to a minimum. III INSTALLATION TusandPacking-Inspectthechusistoseethat alltubesare:firmly in their respective sockets ;mdtha.t any p;lckingisremoved fromthereceIver. PowerSupply-Make surethattheprimary tap lead onthepowertri!.l1sforrnerisconnectedtothe transformer tapwhichmost nearly agrees withthe50 to 60 cycle power source voltage. Anlenna-Theinputimpedanceattheantenna terminalsisdesignedtomatchOJ.100ohmtransmission hne.Theangle plugadapterand connector. supplied WIththereceiver,is designedfor usewitha smalldia- meter,TWINAXtr.tnsmission Ime, which should beused with a bab.ncedantennaInstallation.Ifitis deSiredtooperatewitha smglewiantenna. the ;m- leonaludinwireshouldbe.connectedtoonetcrminOlI ofthe connector plug and agroundlead shouldbe connected fromtheotherterminal oftheconnector plugtothe ground terminal. whIchisadjacenttothe ;l.ntenna input receptacle :u thereuofthetumngunit. Speaker -Theloud speakcr shouldbeofthe pt:r- manent magnet dynamic typt: and should include a speaker voice coil to 600ohmlinc matching traIl!- former for connectiOn to the 600ohmaudiooutput terminalsofthe receiver. Headphones -Either loworhihimpedance head phones maybeused inthephone jack.Thehigh1m pedance typeisrecommended.Thephone jackIS10- CilIOOatthelower left sideofthe front panel. Mounting-Thereceivcr maybeplotcedona tahle ormountedInaD.ndard19lOchnllk.Ifa table model ISpurchased.ItissuppliedWItha steel cablllelThe cabinet shouldbeplaced in a position which permlU the free accessofair fortheventilation louvers. IV OPERATION DESCRIPTIONOFCONTROLS Thefront panel dialsandcontrolsueshown in Figure I andtherear chassis skirt controls ilnd termin- alsareshown10FIgure 6. TuningDials -Themilin diiil is totheleft andthe bandspread dialistotheright.Themain dial has six frequency band scales, calibratedinmegat:yclcsandan arbItrary,outerscale.Theband spread dial has an ar- bItrary. 0 to 100. scaleThenumernl under the fixed p,.,interofthe main dial indicates thenumberofrevo lutions thilt have been made bytheband spread dial at any settingThus.ifthepointer, for theouter scale.ofthe main dial indicatesoverthe figure 4 and thebitnd spread dIal indicates 87.6. the reading tolol,! lorthis settingISread. 487.6.Thisprecise mechanical hand spread system dividestherotationofthemain dIalovereach frequencybandinto approximately 600 bandspread divisions. withonehalfdivision calibra.- tlOnpomts.SlOceitiseasy to estimateonetenthdIVi- slons.ontheIndspreadsnle,thLSdivides each fre- quencyhand into itpproximately 6000 readilble set- tings. ThIS permits extreme i1ccuracyinthe loggingof stations. Crystal ControlledHFOscilla.tor -foroperntion onfil(eJfrequencychilnnclstheFREQUENCY CONTROLISprovided.Thecrystals are not sup- plied with the receiver, hut will be supplied on special order.Inordertoinsure correct crystal controlled frequency operation crystal units should be ordered fromHAMMARLUNDMFG.CO.INC.and the ordershould specify the signal frequency. for which each unitistobeused.Thefrequency control unit has provision forsixcrystals. Variable frequency op- crationorcrystal controlled frequcncy operation on anyofthesixcrystOlIpositionsissclected by the CRYSTALSWITCH.ThecrystalOSCillatorisde- sIgned foruSC!WIthsuitOlblecrystals at;)Inyfrequency 10the rnngeofthereceiverOlbo.:onemegacycle.The DELTAFREQ controlisuSC!dto compcns.ltefor a very small plusorminus frequency toleranceofthe crystals. Theprocedure for crystal frequency control opera- tion should be as follows: Loosen the knurledthumb screwontopofthe crystal unit and push the retainer spring assembly tothereu.lnscnthecrystal or cry stals inthecrystal sockets, numbered Ito6.Bring the lCtainer spring assemblyfOlollardso th;n the sprinc:s pressontop ofthecryst41 holders and tl.ghten the thumbscrew.Mark thesign:ll
