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P. 5
PRC-47_-35_Man

PRC-47_-35_Man

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TM 11-5820-509-35TECHNICAL MANUALDIRECT SUPPORT, GENERAL SUPPORT,AND DEPOTMAINTENANCE MANUALINCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTSRADIO SET AN/PRC-47This copy is a reprint which includes current pages from Changes 1 and 2.HEADQUARTERS DEPARTMENT OF THE ARMYNOVEMBER 1974
 
WARNING
Avoid contact with the high-voltage circuits and the antenna terminal of the radio transmitter-receiverwhile performing trouble isolation procedures personal injury may result.
WARNING
The 650- and 1500-volts potentials at the power amplifier screen and plate electrodes are extremelydangerous. Avoid contact with these circuits.
WARNING
Place the POWER-LIGHTS switch to POWER OFF, disconnect the primary power source cable from thefront of RT-671/PRC-47, and discharge the plate circuit capacitors and high-voltage filter capacitors inthe power supply before proceeding with the following test. Personal injury or death can result fromthese dangerous voltages.
WARNING
Avoid contact with the high-voltage circuits of Signal Data translator CV-1377A/PRC-47 (A3), PowerSupply PP-3518/PRC-47 (A5). and in the power amplifier compartment. These voltages can causepersonal injury or death.
WARNING
Before removing any equipment cover or module from Radio Receiver-Transmitter RT-671/PRC-47,disconnect all power from the unit.
WARNING
High voltages are present in the circuits associated with Signal Data Translator CV-1377A/PRC-47,Power Supply PP-3518/PRC-47, and the power amplifier compartment. These voltages are dangerousand can cause personal injury or death. Ground the two high-voltage terminals on the main chassis (J1-A1 and J1-A2) to discharge the capacitors in the high voltage circuits before beginning maintenancewithin the chassis or inside any module.
WARNING
Before further disassembly, short-circuit connector pins P1-A1 and P1-A2 to ground to discharge thehigh-voltage filter capacitors. Personal injury or death can result from these voltages.
WARNING
High voltages are present on circuit components associated with the power amplifier stage. Thesevoltages are dangerous and can be fatal. Before beginning tube replacement, ground the two high-voltage terminals (J1-A1 and J1-A2) on the main chassis to discharge the filter capacitors in thisequipment.
 
*TM 11-5820-509-35
TECHNICAL MANUALHEADQUARTERSDEPARTMENT OF THE ARMYNo. 11-5820-509-35WASHINGTON, DC, 29 November 1974
Direct Support, General Support andDepot Maintenance Manual(Including Repair Parts and Special Tools List)RADIO SET AN/PRC-47
ParagraphPageCHAPTER 1.INTRODUCTIONScope.................................................................................................................................1-11-1Indexes of publications.......................................................................................................1-21-1Reporting of errors .............................................................................................................1-31-1Reporting equipment improvement recommendations (EIR)................................................1-3.1Administrative storage........................................................................................................1-3.2Destruction of Army electronics materiel.............................................................................1-3.3Historical revisions to equipment........................................................................................1-42.FUNCTION OF EQUIPMENTSection I.System FunctionSystem applications ...........................................................................................................2-12-1Block diagram explanations................................................................................................2-22-1Overall block diagram.........................................................................................................2-32-1General description ............................................................................................................2-42-3Receive signal path ...........................................................................................................2-52-8Transmit signal path...........................................................................................................2-62-9Frequency control circuits ..................................................................................................2-72-9Power supply circuits .........................................................................................................2-82-12Section II.Theory of Receiver-Transmitter OperationAudio Frequency AmplifierAM-3506/PRC-47 (A8A1)................................................................................................2-92-14Amplifier-ModulatorAM-3507/PRC-47 (A8A2)................................................................................................2-102-18Signal Data TranslatorCV-1377A/PRC-47 (A8A3)..............................................................................................2-112-21Power Supply PP-3518/PRC-47 (A8A5)..............................................................................2-122-27Radio Frequency Oscillator0-1032/PRC-47 (A8A6).......................................................................................................2-132-28Oscillator Control................................................................................................................C-4311/PRC-47 (A8A7)......................................................................................................2-142-29Electrical Equipment Chassis..............................................................................................CH-474/PRC-47 (A8A4)......................................................................................................2-152-31CHAPTER 3.DIRECT SUPPORT MAINTENANCE..................................................................................SectionI.General Troubleshooting TechniquesScope.................................................................................................................................3-13-1Tools, test equipment, and materials required ....................................................................3-23-2SectionII.Direct Support Troubleshooting...........................................................................................Overall troubleshooting.......................................................................................................3-33-3Troubleshooting Radio Receiver-Transmitter RT-671/PRC-47 (A8).....................................3-43-3Localizing Tests..................................................................................................................3-53-75SectionIII.Isolating TroubleTrouble isolation within a module........................................................................................3-63-87Dc resistance of coils and transformer windings..................................................................3-73-88SectionIV.RepairGeneral parts replacement techniques................................................................................3-83-95General removal and replacement procedures ...................................................................3-93-96SectionV.Assembly and DisassemblyGeneral..............................................................................................................................3-103-97Removal and replacement of receiver-transmitter case.......................................................3-113-97
*This manual supersedes TM 11-5820-509-35, 20 November 1963, Including all changes.Change 2i
 
TM 11-5820-509-35
ParagraphPageCHAPTER 3.Direct Support Maintenance --ContRemoval and replacement of plug-in modules ...................................................................3-123-97Module assembly and disassembly procedures ..................................................................3-133-98Power amplifier (A8A4A1) tube removal and replacement...................................................3-143-103Power amplifier load-tune mechanism................................................................................3-153-104Frequency selection mechanism.........................................................................................3-163-107Power amplifier (A8A4A1) plate capacitor switch assembly.................................................3-173-111Power amplifier (A8A4A1 XMTR PWR switch ....................................................................3-183-112Main chassis and front panel removal and reassembly .......................................................3-193-114SectionVI.Alignment and AdjustmentsTest equipment and special tools required for alignment and adjustments...........................3-203-116Mechanical alignment of CV-1377A/PRC-47 slug rack coupler............................................3-213-124Receiver audio output adjustments ...................................................................................3-223-125Receiver agc circuit adjustments ........................................................................................3-233-125Transmitter sidetone adjustment ......................................................................................3-243-126Microphone amplifier gain adjustment.................................................................................3-253-127Transmitter vox gain adjustment ........................................................................................3-263-127Power amplifier grid drive alignment and bias adjustments.................................................3-273-128Temperature compensated oscillator frequency adjustment................................................3-283-129Balanced modular adjustments ..........................................................................................3-293-130CHAPTER 4.GENERAL SUPPORT MAINTENANCEGeneral .............................................................................................................................4-14-1Test equipment required ..................................................................................................4-24-1Test facilities .....................................................................................................................4-34-1Modification work orders ....................................................................................................4-44-1Physical tests and inspection................................................................................................4-54-1Receiver sensitivity tests.....................................................................................................4-64-2Receiver avc characteristic test...........................................................................................4-74-4Receiver selectivity tests ....................................................................................................4-84-5Receiver if rejection test .....................................................................................................4-94-6Receiver image rejection test .............................................................................................4-104-6Receiver volume control test ..............................................................................................4-114-7Receiver audio output distortion test ..................................................................................4-124-7Power input requirements, receive mode ............................................................................4-134-8Transmitter power output test ............................................................................................4-144-9Transmitter output meter sensitivity test..............................................................................4-154-13Transmitter frequency stability test ....................................................................................4-164-14Transmitter power input test...............................................................................................4-174-15Transmitter cw operation test..............................................................................................4-184-17Transmitter sidetone test ..................................................................................................4-194-18CHAPTER 5.DEPOT MAINTENANCEGeneral .............................................................................................................................5-15-1Replacement of parts..........................................................................................................5-25-1Equipment adjustments .....................................................................................................5-35-1Transmit mixer balance and transmitter gain control adjustment.........................................5-45-1Transmitter hum balance adjustment..................................................................................5-55-2Transmitter modulation fidelity test.....................................................................................5-65-3Transmitter spurious output adjustments............................................................................5-75-4CHAPTER 6.DEPOT OVERHAUL STANDARDSSectionI.GeneralScope ................................................................................................................................6-16-1General .............................................................................................................................6-26-1Test facilities......................................................................................................................6-36-8Modification work orders ....................................................................................................6-46-8Physical tests and inspection..............................................................................................6-56-8Reference standards tests .................................................................................................6-66-8Tests to be Performed........................................................................................................6-76-9Reference standards...........................................................................................................6-86-9SectionII.Performance TestsGeneral..............................................................................................................................6-96-13Audio Frequency AmplifierAM-3506/PRC47 (A8AI) .................................................................................................6-106-13Amplifier-ModulatorAM-3507/PRC-47 (A8A2) ...............................................................................................6-116-16
ii Change 2
 
TM 11-5820-509-35
ParagraphPageCHAPTER 6.Depot Overhaul Standards-Cont.Signal Data TranslatorCV-1377A/PRC-47 (A8A3)..............................................................................................6-126-18Power SupplyPP-3518/PRC-47 (A8A51)...............................................................................................6-136-24Radio Frequency Oscillator0-1032/PRC-47 (A8A6)...................................................................................................6-146-27Oscillator ControlC-4311/PRC-47 (A8A7)...................................................................................................6-156-31SectionIII.Special Test FixturesGeneral..............................................................................................................................6-166-37Test Fixture for Audio Frequency AmplifierAM 3506/PRC-47............................................................................................................6-176-37Test Fixture for Amplifier-ModulatorAM-3507/PRC-47............................................................................................................6-186-41Test Fixture for Signal Data TranslatorCV-1377A/PRC-47..........................................................................................................6-196-45Test Fixture for Power SupplyPP-3518/PRC-47............................................................................................................6-206-50Test Fixture for Radio Frequency Oscillator0-1032/PRC-47...............................................................................................................6-216-54Test Fixture for Oscillator ControlC-4311/PRC-47...............................................................................................................6-226-56CHAPTER 7.CIRCUIT DIAGRAMSIntroduction.....................................................................................................................7-17-1APPENDIX A.REFERENCES....................................................................................................................A-1APPENDIX B.DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCEREPAIR PARTS AND SPECIAL TOOLS LISTSectionI.IntroductionScope ................................................................................................................................B-1B-1General..............................................................................................................................B-2B-1Explanation of columns ......................................................................................................B-3B-1Special information (Not applicable)....................................................................................B-4B-2How to locate repair part ....................................................................................................B-5B-2Federal supply code for manufacturer (FSCM)....................................................................B-6B-2II.Repair parts for DS, GS, and depot maintenance.................................................................B-4III.Special tools, test, and support equipment...........................................................................B-196IV.Index-federal stock number and reference number cross-reference to figure and itemnumber................................................................................................................................B-197V.Index-reference designation cross-reference to page number...............................................B-259INDEX...........................................................................................................................................INDEX 1
iii
 
TM 11-5820-509-35LIST OF ILLUSTRATIONS
FigureNo.TitlePage
2-1Radio Set AN/PRC-47, Overall Block Diagram..................................................................................................2-22-2Receiver-Transmitter Circuits, Block Diagram....................................................................................................2-42-3Frequency Control Circuits, Block Diagram........................................................................................................2-62-4Power Supply Circuits, Block Diagram ..............................................................................................................2-82-5Compressor/Amplifier Circuits, Schematic Diagram ..........................................................................................2-142-6Output Amplifier, CW Oscillator, and VOX Circuits, Schematic Diagram...........................................................2-162-7Receiver Amplifier, AGC Circuit, and Sidetone Gate, Schematic Diagram..........................................................2-182-8Balanced Modulator, ALC Amplifier Circuit, Schematic Diagram .......................................................................2-192-9IF. Amplifier Circuit, Schematic Diagram ..........................................................................................................2-202-10Last If. Amplifier and Product Detector Circuit, Schematic Diagram...................................................................2-212-11Isolation Amplifier Circuits, Schematic Diagram................................................................................................2-222-12Receive Mixer/Transmit Mixer Circuits, Schematic Diagram ..............................................................................2-242-13Hf Oscillator and Varicap Control Circuits, Schematic Diagram.........................................................................2-262-145- to 14-MHz Amplifier/Limiter Circuits, Schematic Diagram .............................................................................2-272-15Discriminator Circuit Waveforms ......................................................................................................................2-303-1Preliminary Troubleshooting Diagram ...............................................................................................................3-43-2Receiver Tests, Troubleshooting Test Setup .....................................................................................................3-53-3Transmitter Tests, Troubleshooting Test Setup..................................................................................................3-63-4Radio Receiver-Transmitter RT-671/PRC-47 (A8), Top View, Location ofAssemblies and Test Points .............................................................................................................................3-73-5Radio Receiver-Transmitter RT-671/PRC-47 (A8), Bottom View, Location ofAssemblies and Test Points .............................................................................................................................3-83-6Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Top View, CoverRemoved, Location of Subassemblies and Test Points .....................................................................................3-93-7Amplifier-Modulator AM-3507/PRC-47 (A8A2), Side View, Cover Removed,Location of Subassemblies E1 and E2, and Test Points ....................................................................................3-103-8Amplifier-Modulator AM-3507/PRC-47 (A8A2), Side View, Cover Removed,Location of Subassemblies E3, E4, and E5, and Test Points ............................................................................3-103-9Signal Data Translator CV-1377A/PRC-47 (A8A3), Top View, Location ofSubassemblies and Test Points ........................................................................................................................3-113-10Signal Data Translator CV-1377A/PRC-47 (A8A3), Bottom View, Locationof Subassemblies .............................................................................................................................................3-123-11Power Supply PP-3518/PRC-47 (A8A5), Top View, Cover Removed,Location of Subassemblies and Test Points ......................................................................................................3-133-12Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Side View, CoverRemoved, Location of Subassemblies El and E2, and Test Points ....................................................................3-143-13Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Side View, CoverRemoved, Location of Chassis Subassembly and Test Points ..........................................................................3-153-14Oscillator Control C-4311/PRC-47 (A8A7), Top View, Cover Removed,Location of Subassemblies and Test Points ......................................................................................................3-163-15Oscillator Control C-4311/PRC-47 (A8A7), Bottom View, Location ofSubassemblies .................................................................................................................................................3-173-16Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Cover Removed,Chassis Subassembly ......................................................................................................................................3-183-17Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Cover Removed,Subassembly E1...............................................................................................................................................3-193-18Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Cover Removed,Subassembly E2 ..............................................................................................................................................3-203-19Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Cover Removed,Subassembly E3...............................................................................................................................................3-213-20Amplifier-Modulator AM-3507/PRC-47 (A8A2), Cover Removed,Subassemblies E1 and E2.................................................................................................................................3-22
iv
 
TM 11-5820-509-35LIST OF ILLUSTRATIONS (cont)
FigureNo.TitlePage
3-21Amplifier-Modulator AM-3507/PRC-47 (A8A2), Cover Removed,Subassemblies E3, E4 and E5 .........................................................................................................................3-233-22Signal Data Translator CV-1377A/PRC-47 (A8A3), Card Assembly TB1 ...........................................................3-243-23Signal Data Translator CV-1377A/PRC-47 (A8A3), Card Assembly TB2 ...........................................................3-243-24Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assemblies S1,S2, and S3, Top View, Card Assemblies E1 and E3 ..........................................................................................3-253-25Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assemblies S1,S2, and S3, Bottom View, Card Assemblies E2 and E4 ....................................................................................3-253-26Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S1,Rear View ........................................................................................................................................................3-263-27Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S2,Rear View ........................................................................................................................................................3-263-28Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S3,Rear View ........................................................................................................................................................3-273-29Signal Data Translator CV-1377A/PRC-47 (ASA3), Switch Assembly S4,Rear View ........................................................................................................................................................3-273-30Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S5,Rear View ........................................................................................................................................................3-283-31Signal Data Translator CV-1377A/PRC-47 (A8A3), VFO Coil Subassembly,Top View...........................................................................................................................................................3-283-32Signal Data Translator CV-1377A/PRC-47 (A8A3), VFO Coil Subassembly,Bottom View .....................................................................................................................................................3-293-33Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S6,VFO Circuit ......................................................................................................................................................3-303-34Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S7,Front View.........................................................................................................................................................3-313-35Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S8,Rear View ........................................................................................................................................................ 3-313-36Signal Data Translator CV-1377A/PRC-47 (A8A3), Switch Assembly S9,Rear View (Rotor at Index Position no.1.) .........................................................................................................3-323-37Signal Data Translator CV-1377A/PRC-47 (A8A3), Card Assembly E46............................................................3-333-38Signal Data Translator CV-1377A/PRC-47 (A8A3), Card Assembly E47............................................................3-343-39Signal Data Translator CV-1377A/PRC-47 (A8A3), Card Assembly E48............................................................3-353-40Signal Data Translator CV-1377A/PRC-47 (A8A3), Driver Tube (V3)Compartment, Bottom View ..............................................................................................................................3-363-41Signal Data Translator CV-1377A/PRC-47 (A8A3), Bottom View ......................................................................3-373-42Signal Data Translator CV-1377A/PRC-47 (A8A3), Typical Switch Card (S1through S8) Showing Rotor at Index Position no.1 ............................................................................................3-383-43Signal Data Translator CV-1377A/PRC-47 (A8A3), Rear View, FrequencyRange Switch Shaft Retaining Ring...................................................................................................................3-383-44Signal Data Translator CV-1377A/PRC-47 (A8A3), Front View, CouplerPosition at 2,000 kHz Dial Setting .....................................................................................................................3-393-45Power Supply PP-3518/PRC-47 (A8A5), Bottom View, Chassis.........................................................................3-393-46Power Supply PP-3518/PRC-47 (A8A5), Subassembly No. 1, Front View.........................................................3-403-47Power Supply PP-3518/PRC-47 (A8A5), Subassembly No. 1, Rear View...........................................................3-403-48Power Supply PP-3518/PRC-47 (A8A5), Subassembly No. 2 ............................................................................3-413-49Power Supply PP-3518/PRC-47 (A8A5), Subassembly No. 3 ............................................................................3-413-50Power Supply PP-3518/PRC-47 (A8A5), Upper Chassis Assembly ...................................................................3-423-51Power Supply PP-3518/PRC-47 (A8A5), Voltage Regulator Assembly TB1........................................................3-433-52Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Side View, CoverRemoved, Card Assemblies E1 and E2.............................................................................................................3-443-53Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Side View, CoverRemoved, Chassis Assembly ...........................................................................................................................3-45
v
 
TM 11-5820-509-35LIST OF ILLUSTRATIONS (cont)
FigureNo.TitlePage
3-54Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly E1..........................................................................3-463-55Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly E2..........................................................................3-473-56Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly TBI.........................................................................3-483-57Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly E4..........................................................................3-493-58Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly E5..........................................................................3-503-59Oscillator Control C-4311/PRC-47 (A8A7), Card Assembly E6..........................................................................3-513-60Oscillator Control C-4311/PRC-47 (A8A7), Card Assemblies E7 and E8,Front View ........................................................................................................................................................3-523-61Oscillator Control C-4311/PRC-47 (A8A7), Line Filter Assembly at Con-nector P1, Cover Removed ...............................................................................................................................3-523-62Oscillator Control C-4311/PRC-47 (A8A7), Switch Card S5 With RotorShown in Index Position no.1.............................................................................................................................3-533-63Oscillator Control C-4311/PRC-47 (A8A7), Front View, Coupler Position at2000 kHz Dial Setting .......................................................................................................................................3-533-64Power Amplifier Compartment (A8A4AI) Top-View, Cover Removed..................................................................3-543-65Power Amplifier Compartment (A8A4A1) Bottom View, Cover Removed ...........................................................3-553-66Power Amplifier Compartment (A8A4A1) Power Amplifier SubassemblyParts Location ..................................................................................................................................................3-563-67Radio Receiver-Transmitter RT-671/PRC-47 (A8), Bottom View, CoverRemoved..........................................................................................................................................................3-573-68Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Subassembly El,Voltage and Resistance Diagram ......................................................................................................................3-583-69Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Subassembly E2,Voltage and Resistance Diagram.......................................................................................................................3-593-70Audio Frequency Amplifier AM-3506/PRC-47 (A8AI), Subassembly E3,Voltage and Resistance Diagram.......................................................................................................................3-603-71Audio Frequency Amplifier AM-3506/PRC-47 (A8A1), Chassis Assembly,Voltage and Resistance Diagram.......................................................................................................................3-613-72Amplifier-Modulator AM-3507/PRC-47 (A8A2), Subassemblies E1 and E2,Voltage and Resistance Diagram.......................................................................................................................3-623-73Amplifier-Modulator AM-3507/PRC-47 (A8A2), Subassembly E3, Voltageand Resistance Diagram...................................................................................................................................3-633-74Amplifier-Modulator AM-3507/PRC-47 (A8A2), Subassembly E4, Voltageand Resistance Diagram...................................................................................................................................3-643-75Amplifier-Modulator AM-3507/PRC-47 (A8A2), Subassembly E5, Voltageand Resistance Diagram...................................................................................................................................3-653-76Signal Data Translator CV-1377A/PRC-47 (A8A3), Driver Tube (V3)Compartment, Voltage and Resistance Diagram................................................................................................3-663-77Power Supply PP-3518/PRC-47 (A8A5), Voltage Regulator Assembly TB1,Voltage and Resistance Diagram.......................................................................................................................3-663-78Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Subassembly E1,Voltage and Resistance Diagram.......................................................................................................................3-673-79Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Subassembly E2,Voltage and Resistance Diagram.......................................................................................................................3-683-80Radio Frequency Oscillator 0-1032/PRC-47 (A8A6), Chassis Assembly,Voltage and Resistance Diagram.......................................................................................................................3-693-81Electrical Equipment Chassis CH-474/PRC-47 (A8), Power OscillatorAssembly, Voltage and Resistance Diagram......................................................................................................3-703-82Electrical Equipment Chassis CH-474/PRC-47, PA Filter Box FL2 (A8A4)Voltage and Resistance Diagram.......................................................................................................................3-713-83Oscillator Control C-4311/PRC-47 tA8A7), Top View, Waveform Diagram.........................................................3-723-84Cable Assembly Set AN/PRA-4, Equipment Supplied........................................................................................3-90
vi
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