Hammarlund SP-600-JX-21 Service Instructions Manual Download

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Summary of Contents for SP-600-JX-21

Page 1: ... 10l 2 HANDBOOK SERVICE INSTRUCTIONS RADIO RECEIVER MODEL SP 600 JX 21 HAMMARLUND PUBLISHED UNDER AUTHORITY OF THE SECRETARY OF THE AIR FORCE _ AF Nunn Rimmler Inc Cincinnati Ohio 30C 8 6S JlEPRINT 15 JANUARY 1956 ...

Page 2: ...e text affected by the current revision is indicated by a venicalline in the outer margins of the page The asterisk indicates pages revised added or deleted by the current revision A ADDITIONAL COPIES OF THIS PUBLICATION MAY BE OBTAINED AS FOLLOWS USAF ACTIVITIES In accordance with Technical Order No 00 S 2 NAVY ACTIVITIES Submit request to nearest supply point listed below using form NavAer I40 N...

Page 3: ...iving System Block Diagram 13 4 8 Receiver Functional Operation 13 4 22 Simplified Circuit Theory 18 V ORGANIZATIONAL MAINTENANCE 33 5 1 General 33 5 3 Receiver Performance Tests 33 5 6 Trouble Analysis 33 5 11 Minor Repair and Replacement 39 5 16 Removal and Replacement of Subassemblies 39 5 19 Alignment and Adjustment 42 5 23 Preventive Maintenance 43 VI FIELD MAINTENANCE 45 6 1 Trottble Analysi...

Page 4: ...Filter Simplified Schematic Diagram 22 4 7 445 kc Intermediate frequency Amplifier Circuits Schematic Diagram 24 4 8 Beat frequency Oscillator and Buffer Circuits Schematic Diagram 26 4 9 Detector Noise limiter and A V C Circuits Schematic Diagram 27 4 10 Audio Circuits Schematic Diagram 29 4 11 Power Supply Schematic Diagram 30 5 1 Receiver Sensitivity Test Setup 33 5 2 Receiver Cathode follower ...

Page 5: ...Assemblies Removed from Receiver for Shipment 11 IX Receiver Performance Tests 34 X Power Supply Test point Data 37 XI Receiver Sections Test point Data 40 XII Alignment Frequency and Adjustment Designations 43 XIII Inspection Schedule 43 XIV Troubleshooting 45 XV Tube socket Terminal Voltages 49 XVI Tube socket Terminal Resistances 51 XVII D C Resistance of Coils and Windings 52 XVIII Receiver Al...

Page 6: ...iv T O 31R2 4 101 2 A figure 1 1 Radio Receiver Model SP 600 JX 21 ...

Page 7: ...es in temperature and humidity The receiver is treated with fungicidal varnish to condition it for tropical use Its design and shielding reduce its radiation characteristics to a mini mum thereby complying with shipboard regulations and enabling the receiver to be operated in close proximity to other station equipment in multi receiver installations It is suited to two way operational activities a...

Page 8: ...cated under the polystyrene SPARK FUSES cover 10 The receiver ac power cord 9 can be connected directly to an a c power source 1 10 LEADING PARTICULARS 1 11 The receiver antenna system used is connected to the ANT input connector Jl figure 5 4 The re ceiver input impedance is designed to match a 95 ohm 2 transmission line A straight wire or balanced doublet antenna system is used with the receiver...

Page 9: ...equency oscillator a beat frequency buffer amplifier an i f output stage an a f amplifier and an a f power output stage The receiver circuitry available for double conversion does not in clude the initial gate stage of the i f amplifier used for single conversion but includes a second mixer and a second heterodyne crystal controlled osciIIator The re ceiver self contained power supply system inclu...

Page 10: ...f signal fading does not approach the signal speeds used Two different a v c networks are provided When the MOD CW switch 13 is in the cw position a long time constant network is used in the MOD position a short time constant network is used The AVC terminals t figure 1 3 when in terconnected between receivers in a space diversity re ceiving system enable the receiver with the larger signal input ...

Page 11: ... 1 28 FIDELITY The audio and overall fidelity curves for the receiver are shown in figure 1 5 The solid curve indicates the fidelity of the audio frequency am plifier with input applied between terminal 3 of the AUDIO GAIN control 16 figure 1 2 and ground and with the RF GAIN control 12 at minimum The broken curve indicates the overall fidelity at 2 5 mc with AM of 30 percent SELECTIVITY switch 18...

Page 12: ...RYSTAL 4 5 AND 6 CRYSTAL I 15 2 10 3 6 54 45 6 5 0 5 KC OFF RESONANCE 3 10 2 15 1 I I I 7 I I T I I J J 1 I I J I I J i 1 I I 1 I 1 I J J II J J 1 I I 1 I 7 J I I J 1 I J II J J J V V I I 1 10 100 1000 1 I a z w Z I Z o J W 0 J W I Figure J 4 Overall Selectivity Curves at Two Megacycles 6 ...

Page 13: ... 2 is used to lock the tuning mechanism at the tuning setting chosen 1 40 SELECTIVITY The SELECTIVITY switch 18 figure 1 2 provides a choice of XTAL crystal and three NON XTAL noncrystal positions of re ceiver selectivity The six positions provide selectivity steps ranging from a SHARP to a BROAD indica tion The XTAL switch positions provide bandwidths of 0 2 0 5 and 1 3 kc and the NON XTAL switch...

Page 14: ... on any of six preselected channels In the VFO position the continuously variable oscil lator is placed in operation In any of the six XTALS positions the crystal associated with the switch position is connected to the crystal controlled oscillator and the crystal oscillator is placed in operation 1 49 D FREQ The D FREQ control 7 figure 1 2 is used to tune in the signal when the fixed frequency cr...

Page 15: ...own in figure 2 3 TABLE V TEST EQUIPMENT REQUIRED FOR MAINTENANCE AN Type Name Designation Electronic Multimeter ME 74jU Electronic Multimeter ANjUSM 34 Audio Oscillator TS 382AjU RF Signal Generator Set ANjURM 25 RF Signal Generator Set ANjURM 26 Signal Generator TS 447jU Cathode Ray Oscilloscope OS 9jU Tube Tester ANjUSM 31 Alternate ME 6AjU ME 25AjU Hewlett Packard 200AB Precision E 200 C Preci...

Page 16: ... T O 31R2 4 101 2 PL 259 RG 59 U 100 OHM a2 F 9 LANTENNA INPUT CONNECTOR TO SIGNAL GENERAT Figure 2 2 Antenna Cable PL 259 RG 59 U APPROX 20 IN LONG 0 _1 3 LlFOUTPUT CONNECTOR 10 Figure 2 3 Cathode follower Cable ...

Page 17: ...MER TAP VOLTAGE RATINGS CAUTION Choose the power transformer primary tap whose voltage rating is in closest agreement with the a c source voltage 3 6 PLUG CONNECTOR ASSEMBLIES Each plug connector assembly removed from the receiver for ship ment is listed in table VIII As it is unpacked connect each plug to the receiver 3 7 PREPARATION FOR RESHIPMENT OR STORAGE 3 8 When the radio receiver is to be ...

Page 18: ...s and place in the carton at the side of the receiver f Complete the taping of the carton using the three inch tape 12 g Wrap the carton in waterproof paper and seal all folds with three inch waterproof tape h Put the waterproof wrapped carton into the wooden case i Nail the cover on the wooden case and put two steel straps around the case j Stencil aU markings on the end of the case and affix an ...

Page 19: ...on tube associated with each stage The receiver is a superheterodyne type using single conver sion on frequencies below 7 4 mc and double conversion on frequencies above 7 4 mc The antenna input circuit is designed for a balanced doublet or a single wire an tenna system 4 10 The signal voltage induced into the antenna cir cuit is applied to a two stage tuned r f amplifier com prising tubes VI and ...

Page 20: ... the first mixer stage a 3955 kc if results Before application to the i f amplifiers the sig nal must be converted to the 455 kc frequency to which the i f circuits are tuned This second frequency con version is accomplished in the second mixer circuit A 14 switch ganged to the BAND CHANGE control dis ables the 455 kc i f gate circuit and applies power to the 3 5 mc crystal oscillator tube V8 and ...

Page 21: ...2AU7 6V6GT I i I i T I AVC t I I VI5A VI5B 455 V7 I 455 VI2 L1MIT METER KC GATE KC VI3 BUFFER ER RECTI f 1 2 FIER 57491 BFO 57491 6C4 57261 1 2 6BA6W 6BA6W 6AL5WI 57261 6097 6AL5WI 6097 FREQ CONTROL SELECTOR VIS VI9 VOLTAGE B RECTIFIER REGULATOR 5R4GY OA2 SIGNAL PATH COMMON TO AC SOURCE V3 V4 ALL FREQUENCIES FFO VFO SIGNAL PATH FOR FREQUENCIES V20 6AC7 6C4 BELOW 7AMC C RECTIFIER SIGNAL PATH FOR FR...

Page 22: ...citance coupled triode voltage amplifier whose output voltage drives the grid of tube V17 The output amplifier is a cathode biased beam power amplifier circuit whose output is 16 transformer coupled to the load The output amplifier furnishes a maximum of two watts of undistorted power to a 600 ohm load connected to the AUDIO OUTPUT terminals B figure 1 3 on the rear apron A separate winding on the...

Page 23: ... n RII i I I I I I CID I I I I I J I L I INTERSTAGE RFTUNER I I 0 54 1 35 Me I I _________L __ _ C23 I I C163 I CIA CIB R2 RI CIS VI I STRF 5749 68A6W 5 2 I I I I I I I I I L __ l TUNING E61 r I LI i I I r 1 I JI ANTENNA I INPUT I C3 C2 CONNECTOR I L _ ANTENNA R F TUNER 0 54 1 35 MC R97 i _ AVC FROM AVC BUS bSS J C41 Figure 4 3 Radio frequency Amplifiers Schematic Diagram R93 o MAN R FGAIN 5IVDC I...

Page 24: ...ontrol grid is used to control the gain of the stage The RF GAIN control is always operative even in automatic operation and may 18 be used to control the overall r f gain of the stage For direction finding applications where greater sensitivity and greater selectivity are required the bias lead is removed from the NORMAL link and placed on the DF link In the DF position the a v c potential is les...

Page 25: ...I 0 R38 I I lIo V8 CI03I I 3 5MCOSC I CI02 6C4 I V6 2ND MIXER 6BE6 T2 R97 4 FROM AVC BUS Ave S8 J C165 R53 R32 C167 C70 t TI V7 GATE 5749 6BA6W R33 r I I I I I I I I I R31 I L_ J C73 R27 C66 R26 FROM R AMPUFIER 150VDC REGULATED 5IVDC R48 RI15 RI16 265 VDC III n o l Figure 4 4 Single and Double conversion Circuits Schematic Diagram ...

Page 26: ...g are developed across the C67 L31 tank circuit and nals flow through the complex plate load and only the applied to the second mixer by means of transformer 455 kc signals are developed A portion of the signal coupling developed across voltage divider resistors R32 and R33 is applied to the control grid of gate tube V7 The out 4 29 The fixed frequency heterodyne oscillator is an put of the gate c...

Page 27: ...gate circuit on the three higher bands The plate potential for this stage is ap plied through the primary windings of i f interstage transformer T3 The plate circuit of first mixer tube V5 contains two independent parallel resonant circuits which comprise the primary windings of interstage trans former T1 As described in paragraph 4 28 the L32 winding is resonant to 455 kc and the L31 winding is r...

Page 28: ...nt channel signals by utilizing the crystal as a variable frequency filter The first of these purposes is achieved through the inherent sharp frequency response of the crystal the second is achieved by making use of the fact that the crystal and its holder comprise a series L C R network shunted by the capacity of the crystal holder This network can be made parallel resonant at frequen cies above ...

Page 29: ...f the crystal and its holder The input terminals of the bridge are connected to the sec ondary of inductor L36 the output terminals are con nected to the output tank circuit When XTAL PHAS ING control CIII is properly adjusted the bridge is balanced and no voltage is coupled through the shunt capacity of the crystal to the output circuit The only coupling possible under these conditions is through...

Page 30: ...I25 L JL JL42 t L41 CI26 I I IR56 I ICI27 I I I I S5C I L XTAL j I I I I I I I I I CI24 I ICI23 I I 1 LJ I I I I R51 ICI21 I II 1 J R52 VIO 2ND IF 5749 6BA6W H R49 T4 r 0 1 I i 0 Dr _ I I II I I iii I CII9 I R50 I II I JVI L l L J L38 L39 CI20 r I I I I I I I I ICI17 I ICII8 II 1 L S R44 I I CII5 I I I I I I I I V9 I ST IF 5749 6BA6W FROM PIN 5 OF V6 5 2ND MIXER OR 2 6 V7 GATE I 4 _ I XTAL PHASING...

Page 31: ... to the control grid of driver tube VII through grid stabilizing resistor R55 The driver stage a power amplifier obtains bias voltage from a voltage divider compnslOg resistors R57 R56 and RI13 which are connected across the IO volt output of the C rectifier Resistor R57 in conjunction with capacitors Cl27 and C128 also serves as a grid decoupling filter Plate volt age is supplied from the 265 vol...

Page 32: ... 41 VI2 BUFFER 5149 6BA6W RIOO L47 R59 JCI29B 265 VDC 5 I 6 I I I R15 I VI3 I BFa 6C4 CI30 L45 I CI31 BEAT I OSc I I CI33 I rCI36 R77 R76 r L46 L _ _ I I I I I I I I ____________ J S7 150 VDC L Il C W Il Ilo M O Il REGULA TED Figure 4 8 Seat frequency Oscillator and Suffer Circuits Schematic Diagram 26 ...

Page 33: ...ilizes a diode detector circuit with inherent characteristics of good fidelity and good signal handling capabilities The 455 kc input signal is detected in the circuit and the audio component applied to the a f section of the re ceiver A diode shunt type noise limiter circuit is in cluded to reduce pulse type noise from the audio output The 455 kc signal is also applied to the a v c circuit JCI64 ...

Page 34: ...e of VISA becomes negative with respect to the plate and tube VI5A conducts and shunts the de tector load current to ground through the low impedance 28 path provided by the tube and capacitor C144 The sig nal applied to the a f amplifiers is momentarily inter rupted and the noise pulse does not appear in the re ceiver output 4 51 For maximum weak signal sensitivity a delayed a v c system is used ...

Page 35: ...ing connected to the AUDIO OUTPUT terminal board is designed to match a 600 ohm load The 600 ohm secondary is split and the two sections are con nected together at the AUDIO OUTPUT terminal board When a 600 ohm transmission line carries the audio output to a remote operating point a d c device such as a teletypewriter may share the same transmission line The doc output current of the teletypewrite...

Page 36: ...05VDC R90 CIS8 CI59 CI60 f l CIS6 V20 C RECTIFIER 6ALS 2 R87 R88 R86 R89 6 VI9 4 B RECTIFIER 5R4GY 7 5 VAC F2 3 8A II_ B II I I I I I I 6 3 VAC II 7 5VAC T8 r I r 4 4l _ f lml _ __ J r i I Is VAC LSI I JCI6IA 260 234 1 I I I I I I L1 _ J ON SIO OFF PI AC POWER 50 60 CPS FI 1 6A LINE Co o 12 13 14 lCI54 Figure 4 1 J Power Supply Schematic Diagram ...

Page 37: ... voltage secondary winding of transformer T8 and its filament voltage from the 5 volt secondary wind ing The applied voltage is rectified and applied to a two section pi type filter comprising capacitors C161A C161B and C161C and filter chokes L51 and L52 Volt age regulator tube V18 is connected to the output of the B rectifier circuit through dropping resistor R85 and furnishes regulated 150 volt...

Page 38: ...ceiver indicating the nature of the defect and initiate the necessary action for field maintenance 5 5 PERFORMANCE TEST PROCEDURE If the re ceiver operates normally during the preliminary checks outlined in paragraph 5 4 proceed with the receiver performance tests outlined in table IX If the receiver fails to meet any of the minimum performance standards noted in the table refer to paragraphs 5 8 ...

Page 39: ... was in off position Note r f uv output reading on signal gener ator A reading of 2 uv or less at any signal frequency within tuning range of receiver is required under minimum performance standards Adjust AUDIO GAIN control for a read ing of 10 db lO mw output at 10 1 point and record exact setting of control Equipment connected as shown in figure 5 1 Repeat receiver sensitivity test to obtain si...

Page 40: ...btained on either side of zero Connect an audio oscillator to a headset or loudspeaker and by matching tone output of audio oscillator to beat output of re ceiver determine that beat note is 3 kc Check frequency stability of bfo by settirig BEAT OSC control to arbitrary settings and noting whether or not beat note remains constant at each setting Disconnect signal generator and connect an tenna to...

Page 41: ...erator frequency Note receiver i f output indication on elec tronic multimeter Receiver i f output should be 200 mv or more with a 2 uv input signal Connect equipment as shown in figure 5 1 Measure receiver sensitivity at signal fre quencies listed in table IV following pro cedure outlined above for receiver sensitiv ity test Record input signal voltage reo quired for 1O mw output at each frequenc...

Page 42: ...CONTROL selec tor switch to VFO Set SEND REC switch to SEND Set SEND REC switch to REC rotate BAND CHANGE control through six bands RF GAIN control at max RF GAIN control at min Set FREQ CONTROL selec tor switch to VFO and then to XTALS positions RF GAIN control at max RF GAIN control at min None Possible Cause of Abnormal Indication F2 V19 V17 T7 If fault clears check V3 If fault clears check Vl ...

Page 43: ...ible Cause of Abnormal Indication 6 lOY None Field maintenance required Junction of R95 and R96 7 lV MAN AVC switch at MAN RF GAIN control at max V10 V9 V7 V6 T2 Junction of R93 and R94 JUNCTION R93 R94 E JUNCTION C160 R92 R93 JUNCTION L51 L52 CI61B VI6 PIN 2 PIN I V9 H I H VIO PIN I Figure 5 3 Radio Receiver Test point Location 38 ...

Page 44: ...ghten the knurled screw To replace any of the remaining tubes in the re ceiver first remove the tube shield by twisting it counter clockwise while exerting downward pressure Then lift out the tube with a tube remover and replace it Replace the tube shield 5 13 PILOT LAMPS The four pilot lamps used in the receiver are of the bayonet base type To remove a pilot lamp lift the individual lamp socket o...

Page 45: ...x AVC MAN switch in MAN posicion and BAND CHANGE control set for 1 35 3 45 me Same as step 4 Input from signal gen approx 0 6V Input from signal gen approx 15 000 uv Input from signal gen approx 300 uv Vll V14 and or V15 V16A VIO and or T5 V9 and orT4 6 7 Pin 1 V7 Pin 7 V5 Same as step 3 Same as step 3 Same as step 4 Same as step 4 Input from signal gen V6 V7 and or T3 approx 75 uv Input from sign...

Page 46: ...subassembly see figures 5 3 and 5 4 first re move the shield can by removing the four No 6 32 machine screws which hold the shield can in place Then unsolder the externally connected leads at the subassem bly terminals and remove the two No 6 32 machine screws which attach the subassembly to the receiver chassis lift the subassembly fr om the receiver To re place any of the subassemblies follow th...

Page 47: ...erodyne oscil lator only as follows a Set up the equipment for the sensitivity test refer to table IX with the receiver main dial set in turn to the alignment frequencies listed in table XII b Remove the metal button to align C for the variable frequency heterodyne oscillator see figure 5 5 Readjust the capacitor setting slightly with an insulated alignment tool to obtain maximum receiver output c...

Page 48: ...and L42 for T5 L38 and L39 for T4 L37 and L36 for T3 and L34 and L33 for T2 See figure 5 5 b Align in turn the adjustable tuning cores for the replaced i f transformers only for maximum receiver output repeating the procedure until no further increase in output results 5 23 PREVENTIVE MAINTENANCE 5 24 LUBRICATION All parts of the radio receiver requiring lubrication have been adequately lubricated...

Page 49: ...amage Zero meter with adjustment screw Inspect tubes for loose envelope Check tube sockets for cracks and broken pins check sockets for spring tension check for dirt moisture and signs of over heating Inspect for bulges leaks and signs of over heating Check for dirt moisture and bent or dam aged plates Inspect for cracks chipping and dirt or moisture Inspect resistors for signs of overheating Chec...

Page 50: ...ded in the table are the frequencies and amplitudes of the signals injected at each point and the normal receiver output voltage The steps in the table are sequential and it is assumed that any trouble which might have been indicated in a preceding step has been cleared Through the use of the troubleshooting table a fault may be readily isolated to a specific circuit To find the defective part wit...

Page 51: ...than 20V 16 0 5 V 400 cps signal applied Defective first audio circuit through 0 01 uf to test point 3 AUDIO GAIN at max receiver audio output less than 20V 46 Refer to symptom 18 Refer to symptom 30 Check for voltage at AC power outlet If absent check a c source power cable and capacitors C158 and C168 Replace defective parts Check fuse Fl switch SlO part of RF GAIN control and transformer T8 Rep...

Page 52: ...mp tom 17 audio output less than 20V 22 65 uv 455 kc AM of 400 cps Defective first mixer circuit applied through 0 01 uf to test point 5 receiver set as for symp tom 17 audio output less than 20V Check jumper across DIODE OUTPUT terminals VII and V14 Check V15 and V16 for shorts Check C127 C128 C129A C129B C139 C141 C142 C143 R55 R56 R57 R58 R59 R61 R62 R63 R64 R65 and RI13 Replace defective parts...

Page 53: ...except input signal level 10 uv tuning meter does not indicate 20 db 30 Signal generator and receiver con Defective meter circuit nected as for symptom 25 except AUDIO GAIN control adjusted for 1 9 V receiver output with METER switch in AF posi tion meter reads some value other than zero db 31 Signal generator and receiver con Defective b f o circuits nected as for symptom 25 except receiver set f...

Page 54: ...lt voltmeter or a d c vtvm to make the measurements Keep the a c line voltage at 117 volts and adjust the receiver for manual c w operation but with no signal input and the AUDIO GAIN control at minimum Socket Pin Numbers Tube J 2 3 4 5 6 7 8 9 Mode of Operation VI 1 6 3ac 200 95 RF GAIN max VI 41 6 3ac 260 245 RF GAIN min V2 1 6 3ac 210 95 RF GAIN max V2 41 6 3ac 260 245 RF GAIN min V3 0 6 3ac 26...

Page 55: ... Freq above 7 4 me V9 1 6 3ae 205 90 RF GAIN max Y9 54 6 3ae 260 150 RF GAIN min VI0 1 6 3ae 205 90 RF GAIN max VI0 54 6 3ae 260 150 RF GAIN min Yn 7 S 6 3ae 210 140 RF GAIN max Vn 7 S 6 3ae 235 140 RF GAIN min V12 6 3ae 210 40 RF GAIN max b f o injection max Y12 6 3ac 240 45 RF GAIN min b f o injection max Vl3 25 6 3ae 25 RF GAIN max or min V14 6 3ae 22 RF GAIN max or min V15 6 3ae RF GAIN max or...

Page 56: ... 17 5k 9 5k 0 17 5k 9 5k 0 17 5k 19k 0 17 5k 115k Var freq osc operation Freq band 1 35 3 45 mc Freq bands below 7 4 mc Freq bands above 7 4 mc Freq bands above 7 4 mc Freq bands below 7 4 mc Freq bands below 7 4 mc Freq bands above 7 4 mc 0 to 1k BFO IN control 15 8k 680 360 o 65k o 196k 196k o o 40 o 17 4k 470k o 162k lOOk 15 6k inf 49k o o o o o o o o o o o o o o o o 42 o 15 2k 470k inf 20k o 1...

Page 57: ...lder the red lead of the unit from filter capacitor C161 Set the FREQ CONTROL selector switch to its 3 position and loosen the four setscrews in the rigid shaft coupling and the two setscrews in the disc on the selector switch shaft Slide the switch shaft forward through the coupling and disc Loosen the setscrews of the 6 FREQ control knob and remove the knob Remove the nut and lock washer at the ...

Page 58: ...the reverse procedure 6 11 R F STRIP If the receiver fails to operate nor mally on any of its six frequency bands and the trouble has been localized to the r f strip the subassembly must be removed to provide access to its parts The removal and replacement should be performed as follows a To remove the unit remove the ten No 6 32 screws at the top shield of the tuning capacitor assembly and remove...

Page 59: ...ired should not entail more than a slight angular motion of the adjusting screw 6 16 ALIGNMENT PROCEDURE The alignment procedure for the receiver follows a definite sequence the alignment of the 455 kc i f section first then the alignment of the 3955 kc i f section and finally the alignment of the r f amplifiers and first conversion oscil lator on each of the six bands Table XVIII outlines the ste...

Page 60: ...h to REC MOD CW switch to MOD AVC MAN switch to MAN SELECTIVITY switch to 3 kc po sition AUDIO GAIN control at max use approx 20 volts output meter indication BAND CHANGE control for 1 35 3 45 mc band TUNING control for 2 5 mc XTAL PHASING control to ar row RF GAIN control at max then as rec alignment is made reduce to prevent excessive output LIMITER OFF switch to OFF SELECTIVITY switch to 0 2 kc...

Page 61: ...n in put of 7 15 me 30 percent 400 cps AM Repeat step 15 and step 16 in sequence Same as step 17 but set signal gen level to approx 3 uv Same as step 7 but signal gen in put of 7 5 me 30 percent 400 cps AM Same as step 8 but signal gen in put of 14 5 me 30 percent 400 cps AM Repeat step 19 and step 20 in sequence Same as step 7 but set TUNING control for 3A mc main dial in dication Repeat step 11 ...

Page 62: ...on Repeat step 27 and step 28 in se quence Same as step 28 but set rec controls as in step 10 Alignment or Adjustment Same as step 21 repeat as needed Adjust in turn L29 L5 L12 L19 for max output Adjust in turn C90 Cl3 C36 C56 for max output Repeat step 23 and step 24 in se quence until no further increase in output results Same as step 25 repeat as needed Adjust in turn L30 L6 L13 L20 for max out...

Page 63: ...attenuation in db Audio fidelity of receiver should approximate that shown in figure 1 5 Connect equipment as shown in figure 6 2 Tune receiver to r f signal generator frequency Advance AUDIO GAIN control to max and adjust RF GAIN control for 10 mw receiver output 10 db on electronic multimeter Adjust audio oscillator frequency in small steps over frequency range of 50 to 10 000 cps being careful ...

Page 64: ... or mechanical defects which if not corrected may result in receiver failure during operational use The receiver should therefore be inspected regularly as follows a Inspect the receiver for dirt dust and corrosion tropicalization of r f coils chokes and soldered joints evidence of oil leakage loose subassemblies trimmers and adjustable cores poor soldering and partly broken leads b Inspect the V ...

Page 65: ...t similar type springs tised to provide indicator slide action and to provide holding action of the conversion switch located at the rear of the turret rotor assembly 6 22 OVERHAUL SCHEDULE 6 23 The overhaul schedule of the receiver is depend ent upon the operating conditions to which it has been subjected in normal use When a receiver is turned in to 60 maintenance activIties for repair the need ...

Page 66: ... accessible from the bot tom of the radio receiver The voltage values listed in figure 7 2 are all with reference to chassis ground ex cept where noted otherwise Unless indicated otherwise all voltages are de The readings were obtained with a vtvm The 500 volt scale was used for all voltages above 10 volts and the lO volt scale for voltages below 10 volts Line voltage was 117 volts with no signal ...

Page 67: ...RII 1 Me G S5B R48 1 0 MEG NORMAL _ I 1 I I I ___J 1ST IF V9 5749 6BA6W 117 2ND MIXER V6 6BE6 SO IO AC A c I CI65 10K OIMFD S9 U II l 0 I I po 8 I It_ CI02 I po t III R37 I 04 I I po MFD 2200 I B I It SINGLE CONVERSION iFf I 54 _7 4 e r r t F J I r I t I l L J 2S Io4FDC 7 I 0 I ON D I I I I I 5 I ___ J 1ST MIXER V5 6BE6 1 I I I I I I I I CIH I I I I I I g C53 J 14 _ II __ T25 C55 1 18 FREQ CONTROL...

Page 68: ...W OF CHASSIS 260V IV IV 1 5V 210V 228V 6 3 VAC 12V 6 3VAC 95V 50V 6 4V 6 3VAC 6 3VAC 210V 95V 200V 6 3 VAC V6 VOLTAGE PRESENT ONLY WHEN VOLTAGES PRESENT ONLY WHEN RECEIVER IS SET TO BANDS 4 5 AND 6 RECEIVER SET TO BANDS 1 2 AND 3 BOTTOM VIEW OF CHASSIS 150V VI3 VI8 300V VAC BETWEEN PINS 2 300V AND 8 VI9 96V 6 3 VAC 96V V20 V8 VOLTAGES PRESENT ONLY WHEN RECEIVER IS SET TO BANDS 4 5 AND 6 25V 150V 6...

Page 69: ...J CONTROL 0 17 5K 19K V3 42 VI9 0 INFINITE IN VFO OPERATION 49K 0 93K 65K 0 196K 0 49K 0 V20 15 6K 0 0 816K 0 lOOK VI4 0 162K 17 5K 0 0 VI3 1 1 MEG 9 5K 0 0 22K 0 0 0 17 5K 19K 47K 19K 0 48K 1 1 MEG 9 5K INFINITE INFINITE 0 22K 390 0 V6 V7 0 0 V8 V4 V5 INFINITE ON BANDS 1 2 AND 3 INFINITE ON BANDS 1 2 AND 3 INFINITE ON BANDS 4 5 AND 6 INFINITE WITH FREQ CONTROL SWITCH FREQUENCY BAND 1 35 3 45 MC I...

Page 70: ...T O 31R2 4 101 2 SECTION VIII DIFFERENCE DATA SHEETS NOT APPLICABLE Section VIII 65 ...

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