TM-11-5820-670-30

• AVIATION INTERMEDIATE MAINTENANCE MANUAL RADIO SET AN/ARC-131
• SAFETY STEPS
• WARNING
• WARNING-continued
• Table of Contents
• HOW TO USE THIS MANUAL
• Radio Set AN/ARC-131
• CHAPTER 1. INTRODUCTION
• REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).
• Section II EQUIPMENT DESCRIPTION
• Section III PRINCIPLES OF OPERATION
• Section III PRINCIPLES OF OPERATION-continued
• GENERAL
• RECEIVER SIGNAL FLOW.
• LOCAL OSCILLATOR AFC/CRYSTAL REFERENCE SYSTEM.
• COARSE TUNING THE LOCAL OSCILLATOR
• CRS BALANCED MIXER A3200.
• CRS SECOND MIXER A3300 AND CRYSTAL SWITCH A2000.
• CRYSTAL SWITCH A2000
• SECOND MIXER AND CRYSTAL SWITCH OPERATING EXAMPLE
• CRS FIRST AND SECOND IF. AMPLIFIER A3400/CRS THIRD IF. AMPLIFIER AND LIMITER A3500
• CRS HUNT DISCRIMINATOR A3600, CRS PHASE DISCRIMINATOR A3700, AND REFERENCE OSCILLATOR A2000.
• CRS PHASE DISCRIMINATOR A3700
• HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR WORKING EXAMPLE LOCAL OSCILLATOR AT CORRECT FREQUENCY
• HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR-WORKING EXAMPLE - LOCAL OSCILLATOR RUNNING TOO HIGH
• TIME DELAY CIRCUIT P/O MODULE A2100.
• GEARBOX ASSEMBLY A9700.
• RF CONTROL ASSEMBLY P/O MODULE A4500 (RECEIVE MODE).
• ANTENNA TUNING AND PROTECTION MODULE A1100.
• SECOND RF AMPLIFIER MODULE A1300.
• LOCAL OSCILLATOR MODULE A1500.
• LOCAL OSCILLATOR Q1501
• IF. ATTENUATOR MODULE A4900 (RECEIVE MODE).
• THIRD, FOURTH, AND FIFTH IF. AMPLIFIER, LIMITER AND DISCRIMINATOR A4200.
• AUDIO AND SQUELCH PREAMPLIFIER MODULE A4300.
• RECEIVER SQUELCH AMPLIFIER MODULE A5200 AND SQUELCH FILTER MODULE A5300 (RECEIVE MODE).
• TONE (SQUELCH MODE)
• TRANSMITTER SIGNAL FLOW.
• TRANSMllTER SIGNAL FLOW-continued
• MASTER OSCILLATOR FREQUENCY CONTROL LOOP.
• Phase Discriminator
• Hunt Generator
• AUDIO MIXER MODULE A8600.
• FIRST AND SECOND IF. AMPLIFIERS MODULE A8300.
• PHASE DISCRIMINATOR MODULE A8200.
• HUNT GENERATOR MODULE A8400.
• MASTER OSCILLATOR MODULE A6300.
• BUFFER AMPLIFIER MODULE A6400 AND REGULATOR ASSEMBLY.
• ISOLATION AMPLIFIER MODULE A6600.
• MIXER AND BUFFER AMPLIFIER A1400 (TRANSMIT MODE).
• HUNT CUTOFF DETECTOR P/O MODULE A4200.
• AUDIO AMPLIFIER MODULE A5400 (TRANSMIT MODE).
• RF AMPLIFIER ASSEMBLY MODULE A6500.
• AGC AMPLIFIERS
• RF CONTROL ASSEMBLY P/O MODULE A4500 (TRANSMIT MODE).
• REFLECTOMETER
• HOMING SIGNAL FLOW.
• HOMING SIGNAL FLOW-continued
• RF CONTROL ASSEMBLY P/O MODULE A4500 (HOMING MODE).
• IF. ATTENUATOR MODULE A4900 (HOMING MODE).
• HOMER-DETECTOR AMPLIFIER ASSEMBLY A4800.
• IF. AGC AMPLIFIER
• OFF COURSE SIGNAL AMPLIFIER
• SYNCHRONOUS DETECTOR-continued
• RETRANSMIT OPERATION.
• VHF TUNER POWER SUPPLY MODULE A1600.
• VOLTAGE REGULATOR ASSEMBLY A2100.
• RECEIVER-TRANSMlTTER INTRAUNIT CIRCUIT FUNCTIONING.
• DISTRIBUTION OF +16 VDC
• CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING.
• CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING-continued
• CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING-continued
• CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING-continued
• SQUELCH SWITCH S9106
• RADIO SET AN/ARC-131 INTERUNIT CIRCUIT DETAILS.
• TRANSMITTER KEYING CIRCUITS
• TRANSMITTER KEYING CIRCUITS-continued
• AUDIO CIRCUITS
• RADIO SET AN/ARC-131 INTERUNIT CIRCUIT DETAILS-continued
• Retransmit Mode (RETRAN)
• Homing Mode (HOME)
• SQUELCH CONTROL CIRCUITS
• Tone Squelch Mode (TONE)
• TUNING SYSTEM RADIO SET AN/ARC-131.
• WHOLE AND DECIMAL MHZ TUNING CIRCUITS
• TUNING SYSTEM RADIO SET AN/ARC-131-continued
• GEARBOX MECHANICAL TUNING ASSEMBLY
• VHF TUNER MECHANICAL TUNING
• RF OSCILLATOR ASSEMBLY MECHANICAL TUNING
• CHAPTER 2. MAINTENANCE
• Section II PERFORMANCE TESTS
• GENERAL
• TEST METER TESTS.
• TEST PROCEDURE
• AUDIO POWER OUTPUT AND DISTORTION TEST.
• CONTROL AND SWITCH SETTINGS
• AUDIOFREQUENCY RESPONSE AND FRONT PANEL METER TEST.
• CONTROL AND SWITCH SETTINGS
• TEST PROCEDURE
• RECEIVER SENSITIVITY, QUIETING, AND LIMITING TEST.
• CONTROL AND SWITCH SETTINGS
• TEST PROCEDURE
• MAXIMUM SIGNAL PLUS NOISE-TO-NOISE RATIO TEST.
• CONTROL AND SWITCH SETTINGS
• RECEIVER CARRIER SQUELCH SENSITIVITY TEST.
• CONTROL AND SWITCH SETTINGS
• TEST PROCEDURE-continued
• RECEIVER TONE SQUELCH SENSITIVITY TEST.
• TEST SETUP
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER POWER OUTPUT TEST.
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER TONE MODULATION TEST.
• TEST PROCEDURE
• TRANSMITTER DEVIATION NARROW BAND TEST.
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER DISTORTION NARROW BAND TEST.
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER SIGNAL PLUS NOISE-TO-NOISE RATIO TEST.
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER FREQUENCY STABILITY TEST.
• CONTROL AND SWITCH SETTINGS
• TRANSMITTER AUTOMATIC FREQUENCY SELECTION AND CHANNEL CHANGING TONE TEST.
• TRANSMITTER SIDETONE TEST.
• TEST SETUP
• CONTROL AND SWITCH SETTINGS
• HOMING SENSITIVITY TEST.
• CONTROL AND SWITCH SETTINGS
• C-7066/ARC-131 MODE SWITCH SELECTION AND FRONT PANEL ILLUMINATION TEST.
• TEST SETUP
• TEST PROCEDURE
• SQUELCH SWITCH AND FREQUENCY SELECTION TEST.
• TEST PROCEDURE
• TEST PROCEDURE-continued
• RETRANSMIT RECEIVE TEST.
• CONTROL AND SWITCH SETTINGS
• RETRANSMIT TRANSMIT TEST.
• CONTROL AND SWITCH SETTINGS
• Section III TROUBLESHOOTING
• OVERALL TROUBLESHOOTING APPROACH
• GENERAL-continued
• HOW TO USE THE TROUBLESHOOTING CHARTS.
• CORRECTIVE ACTION OR ADDITIONAL INSTRUCTION
• CONTROL AND SWITCH SETTINGS
• CHART 2-1. Voltage Distribution Troubleshooting (Sheet 1 of 5)
• CHART 2-1. Voltage Distribution Troubleshooting (Sheet 2 of 5)
• CHART 2-1. Voltage Distribution Troubleshooting (Sheet 3 of 5)
• CHART 2-1. Voltage Distribution Troubleshooting (Sheet 4 of 5)
• CHART 2-1. Voltage Distribution Troubleshooting (Sheet 5 of 5)
• CHART 2-2. + 27.5 vdc Circuit Troubleshooting (Sheet 1 of 3)
• CHART 2-2. + 27.5 vdc Circuit Troubleshooting (Sheet 2 of 3)
• CHART 2-2. + 27.5 vdc Circuit Troubleshooting (Sheet 3 of 3)
• CHART 2-3. +24 vdc Regulated Circuit Troubleshooting (Sheet 1 of 4)
• CHART 2-3. +24 vdc Regulated Circuit Troubleshooting (Sheet 2 of 4)
• CHART 2-3. +24 vdc Regulated Circuit Troubleshooting (Sheet 3 of 4)
• CHART 2-3. +24 vdc Regulated Circuit Troubleshooting (Sheet 4 of 4)
• CHART 2-4. + 16 vdc Circuit Troubleshooting (Sheet 1 of 4)
• CHART 2-4. + 16 vdc Circuit Troubleshooting (Sheet 2 of 4)
• CHART 2-4. + 16 vdc Circuit Troubleshooting (Sheet 3 of 4)
• CHART 2-4. + 16 vdc Circuit Troubleshooting (Sheet 4 of 4)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 1 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 2 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 3 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 4 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 5 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 6 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 7 of 8)
• CHART 2-5. No Audio Output Troubleshooting(Sheet 8 of 8)
• CHART 2-6. Audio Power Troubleshooting
• CHART 2-7. Audio Distortion Troubleshooting (Sheet 1 of 2)
• CHART 2-7. Audio Distortion Troubleshooting (Sheet 2 of 2)
• CHART 2-8. Poor Audio Response Troubleshooting (Sheet 1 of 2)
• CHART 2-8. Poor Audio Response Troubleshooting (Sheet 2 of 2)
• CHART 2-9. Poor Sensitivity Troubleshooting (Sheet 1 of 2)
• CHART 2-9. Poor Sensitivity Troubleshooting (Sheet 2 of 2)
• CHART 2-10. Maximum Signal Plus Noise-to-Noise Ratio Troubleshooting
• CHART 2-11. Carrier Squelch Sensitivity Troubleshooting
• CHART 2-12. Tone Squelch Sensitivity Troubleshooting (Sheet 1 of 2)
• CHART 2-12. Tone Squelch Sensitivity Troubleshooting (Sheet 2 of 2)
• CHART 2-13. Transmitter Power Output (HI) Troubleshooting (Sheet 1 of 3)
• CHART 2-13. Transmitter Power Output (HI) Troubleshooting (Sheet 2 of 3)
• CHART 2-13. Transmitter Power Output (HI) Troubleshooting (Sheet 3 of 3)
• CHART 2-14. Transmitter Power Output (LO) Troubleshooting
• CHART 2-15. Transmitter Tone Modulation Troubleshooting (Sheet 1 of 2)
• CHART 2-15. Transmitter Tone Modulation Troubleshooting (Sheet 2 of 2)
• CHART 2-16. Transmitter Deviation Narrow Band Troubleshooting (Sheet 1 of 2)
• CHART 2-16. Transmitter Deviation Narrow Band Troubleshooting (Sheet 2 of 2)
• CHART 2-17. Transmitter Distortion Narrow Band Troubleshooting (Sheet 1 of 2)
• CHART 2-17. Transmitter Distortion Narrow Band Troubleshooting (Sheet 2 of 2)
• CHART 2-18. Maximum Signal Plus Noise-to-Noise Ratio Troubleshooting (Sheet 1 of 2)
• CHART 2-18. Maximum Signal Plus Noise-to-Noise Ratio Troubleshooting (Sheet 2 of 2)
• CHART 2-19. Transmitter Frequency Stability Troubleshooting (Sheet 1 of 5)
• CHART 2-19. Transmitter Frequency Stability Troubleshooting (Sheet 2 of 5)
• CHART 2-19. Transmitter Frequency Stability Troubleshooting (Sheet 3 of 5)
• CHART 2-19. Transmitter Frequency Stability Troubleshooting (Sheet 4 of 5)
• CHART 2-19. Transmitter Frequency Stability Troubleshooting (Sheet 5 of 5)
• CHART 2-20. Automatic Frequency Selection and Channel Changing Tone Troubleshooting
• CHART 2-21. Transmitter Sidetone Troubleshooting
• CHART 2-22. Homing Flag Indication Troubleshooting
• CHART 2-23. Homing Needle Indication Troubleshooting (Sheet 1 of 3)
• CHART 2-23. Homing Needle Indication Troubleshooting (Sheet 2 of 3)
• CHART 2-23. Homing Needle Indication Troubleshooting (Sheet 3 of 3)
• CHART 2-24. Control Unit Troubleshooting (Sheet 1 of 12)
• CHART 2-24. Control Unit Troubleshooting (Sheet 2 of 12)
• CHART 2-24. Control Unit Troubleshooting (Sheet 3 of 12)
• CONTROL UNIT RESISTANCE TABLES
• MODE SWITCH at T/R, SEQUELCH switch at DIS.
• MODE SWITCH at RETRAN, SQUELCH switch at DIS.
• MODE SWITCH at RETRAN, SQUELCH switch at TONE.
• MODE SWITCH at HOME, SQUELCH switch at CARR.
• FREQUENCY SELECTION CODE TABLES
• TABLE B. Resistance Measurements for Antenna Coupler MC Tuning Control Lines
• TABLE C. Resistance Measurements for MC Tuning Control Lines
• TABLE C. Resistance Measurements for MC Tuning Control Lines-continued
• Section IV ALINEMENT AND ADJUSTMENT PROCEDURES
• RF AMPLIFIER ASSEMBLY A6500 ALINEMENT.
• CONTROL AND SWITCH SETTINGS
• ALINEMENT PROCEDURE-continued
• GEARBOX ASSEMBLY A9700 ALINEMENT.
• ALINEMENT PROCEDURE-continued
• AUDIO LEVEL ADJUSTMENT.
• CONTROL AND SWITCH SETTINGS
• CARRIER SQUELCH ADJUSTMENT.
• ADJUSTMENT PROCEDURE
• 150 Hz TONE MODULATION FREQUENCY AND DEVIATION ADJUSTMENT.
• ADJUSTMENT PROCEDURE-continued
• TONE SQUELCH ADJUSTMENT.
• ADJUSTMENT PROCEDURE
• NARROW BAND DEVIATION ADJUSTMENT.
• CONTROL AND SWITCH SETTINGS
• RECEIVER SENSITIVITY ADJUSTMENTS.
• ADJUSTMENT PROCEDURE-continued
• ADJUSTMENT PROCEDURE-continued
• ADJUSTMENT PROCEDURE-continued
• LOCAL OSCILLATOR ALINEMENT.
• ALINEMENT PROCEDURE-continued
• HOMING ADJUSTMENT.
• ADJUSTMENT PROCEDURE-continued
• Section V REPAIR AND REPLACEMENT PROCEDURES
• GENERAL.
• RT CASE REPLACEMENT.
• HOMING MODULE A4600 REPLACEMENT.
• A4000 MODULES AND ASSEMBLY REPLACEMENT.
• INSTALLATION
• INSTALLATION-continued
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• A9500 ASSEMBLY REPLACEMENT.
• A3000 MODULES AND ASSEMBLY REPLACEMENT.
• REMOVAL-continued
• INSTALLATION
• INSTALLATION-continued
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• A5500 MODULES AND ASSEMBLY REPLACEMENT.
• REMOVAL-continued
• REMOVAL-continued
• INSTALLATION
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• A8700 MODULES AND ASSEMBLY REPLACEMENT.
• REMOVAL-continued
• INSTALLATION
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• A6600 ASSEMBLY REPLACEMENT.
• POWER SUPPLY CIRCUIT CARD REPLACEMENT.
• INSTALLATION
• A6300 AND A6400 MODULE REPLACEMENT.
• INSTALLATION
• A4500 ASSEMBLY REPLACEMENT.
• REMOVAL
• A2100 ASSEMBLY REPLACEMENT.
• FRONT PANEL REPLACEMENT.
• A1100 THROUGH A1500 MODULE REPLACEMENT.
• INSTALLATION
• FOLLOW-ON MAINTENANCE
• TEST METER M9601 REPLACEMENT.
• SQ DIS SWITCH S9602 AND XMTR TEST SWITCH S9603 REPLACEMENT.
• INSTALLATION
• TEST SWITCH S9601 REPLACEMENT.
• INSTALLATION
• SQ ADJ SWITCH R9602 REPLACEMENT.
• XMTR HI-LO SWITCH S9604 REPLACEMENT.
• A6500 ASSEMBLY REPLACEMENT.
• REMOVAL
• RADIO INTERFERENCE FILTER FL9601 REPLACEMENT.
• INSTALLATION
• TRANSISTOR Q9601 REPLACEMENT.
• INSTALLATION
• A4900 ASSEMBLY REPLACEMENT.
• RF ATTENUATOR AND DIODE SWITCH 24501 REPLACEMENT.
• REFLECTOMETER AND SIDETONE DETECTOR 24502 REPLACEMENT.
• LOW-PASS FILTER FL4501 REPLACEMENT.
• RELAYS K4501 THROUGH K4504 REPLACEMENT.
• RELAYS K9601 THROUGH K9606 REPLACEMENT.
• A1000, A2000, A6000, AND A9700 ASSEMBLY REPLACEMENT.
• REMOVAL-continued
• REMOVAL-continued
• INSTALLATION
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• A1000 ASSEMBLY REPLACEMENT.
• INSTALLATION
• A6000 ASSEMBLY REPLACEMENT.
• INSTALLATION
• A2000 ASSEMBLY REPLACEMENT.
• A9700 ASSEMBLY REPLACEMENT.
• RELAY K3001 REPLACEMENT.
• A1600 ASSEMBLY REPLACEMENT.
• FRONT PANEL KNOBS REPLACEMENT.
• INSTALLATION
• FRONT PANEL DIAL MASK REPLACEMENT.
• LIGHT PANEL REPLACEMENT.
• SWITCH AND WIRING ASSEMBLY REPLACEMENT.
• INSTALLATION
• SQUELCH SWITCH S9106 REPLACEMENT
• INSTALLATION
• VOLUME CONTROL SWITCH R9103 REPLACEMENT.
• INSTALLATION
• TENTHS FREQUENCY SELECTOR SWITCH S9103 AND/OR HUNDREDTHS FREQUENCY SELECTOR SWITCH S9104 REPLACEMENT.
• REMOVAL
• MODE SWITCH S9105 REPLACEMENT
• REMOVAL
• INSTALLATION
• FOLLOW-ON MAINTENANCE
• ELECTRICAL CONNECTOR J910I REPLACEMENT.
• REMOVAL
• TENS FREQUENCY SELECTOR SWITCH S910I REPLACEMENT.
• REMOVAL
• Schematic Drawing
• INSTALLATION
• UNITS FREQUENCY SELECTOR SWITCH S9102 REPLACEMENT.
• UNITS FREQUENCY SELECTOR SWITCH S9102 REPLACEMENT-continued
• REMOVAL-continued
• INSTALLATION
• INSTALLATION-continued
• INSTALLATION-continued
• FOLLOW-ON MAINTENANCE
• APPENDIX A. REFERENCES
• TECHNICAL MANUALS-continued
• TECHNICAL MANUALS-continued
• APPENDIX B. EXPENDABLE SUPPLIES AND MATERIALS LIST
• FO-1. Receiver Signal Path
• FO-2. Crystal Reference System, Functional Diagram
• FO-3. Gearbox Assembly, A9700 Simplified
• FO-4. Audio Amplifier A5400, Squelch Amplifier A5200, Squelch Filter A5300
• FO-5. Transmitter, Signal Path
• FO-6. Transmitter, Frequency Control Loop
• FO-7. Homing Signal Path
• FO-8. Detailed Interconnection Diagram (Retransmit Operation)
• FO-9. Simplified Interconnection Diagram (Retransmit Operation)
• FO-10. Power Supply Assembly A9500, Simplified
• FO-11. Intraunit Power Distribution
• FO-12. Receiver Transmitter, Radio RT-823/ARC-131, Schematic Diagram
• FO-13. Control Radio Set C-7088/ARC-1341, Schematic Diagram
• FO-13. Control Radio Set C-7088/ARC-131, Schematic Diagram
• FO-14. Transmitter Keying Circuits Functional Diagram
• FO-15. Audio Circuits, Radio Set AN/ARC-131
• FO-16. Mode Control Circuits, Radio Set AN/ARC-131
• FO-17. Squelch Control Circuits, Radio Set AN/ARC-131
• FO-18. Receiver-Transmitter, Coding Combinations
• FO-19. Tuning Control Circuits, Functional Diagram
• FO-20. Gearbox Mechanical Tuning Assembly, Mechanical Diagram
• FO-21. Control Radio Set C-7088/ARC-131, Wiring Diagram
• INDEX
• INDEX-continued
• INDEX-continued
• INDEX-continued
• INDEX-continued
• INDEX-continued
• INDEX-continued
• INDEX-continued
• INDEX-continued
• GLOSSARY
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• TM-11-5820-670-30
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