Figure 1-1. Frequency Meters AN/USM-159, AN/USM-159A, and AN/USM-159B
CHAPTER 1. INTRODUCTION - TM-11-6625-486-14-P0013
Section II. DESCRIPTION AND DATA
Description
CHAPTER 2. SERVICE UPON RECEIPT AND INSTALLATION
Figure 2-1. AN/USM-159 (*), packing diagram.
Section II. INSTALLATION
CHAPTER 3. OPERATING INSTRUCTIONS
Figure 3-2. FR-149A/USM-159 and FR-149B/USM-159, controls and indicators.
Section II. OPERATION UNDER USUAL CONDITIONS
Figure 3-3. Interpretation of filmstrip.
Figure 3-4. FR-149(*)/USM-159, calibration tables.
Determining Local Transmitter Frequency When Approximate Frequency is Known
Determining Frequency of Distant Transmitter
Tuning Transmitter to Desired Frequency
Section III. OPERATION UNDER UNUSUAL CONDITIONS
CHAPTER 4. OPERATOR'S AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section III. TROUBLESHOOTING - TM-11-6625-486-14-P0032
Section IV. MAINTENANCE OF FREQUENCY METER
CHAPTER 5. FUNCTIONING OF EQUIPMENT
Figure 5-1. FR-149(*)/USM-159, block diagram.
Figure 5-2. FR-149/USM-159, crystal oscillator, schematic diagram.
Crystal Oscillator Circuit
Figure 5-4. FR-149/USM-159 low frequency oscillator schematic diagram.
Low Frequency Oscillator Circuit
Figure 5-6. FR-149/USM-159 high frequency oscillator, schematic diagram.
High Frequency Oscillator
Figure 5-8. FR-149/USM-159, mixer circuit, schematic diagram.
Mixer Circuit
Crystal Oscillator signal
Audio Amplifier Circuit
Modulator and Dial Lamp Power Circuit
Figure 5-12. FR-149/USM-159 regulated power supply and voltage distribution circuit, schematic diagram.
Figure 5-13. FR-149A/USM-159 and FR-149B/USM-159 regulated power supply and voltage distribution circuit, schematic diagram.
Regulated Power Supply and Voltage Distribution Circuit
CHAPTER 6. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Table 6-2. Dc Resistances of Transformers and Coils
Figure 6-2. Frequency Meter FR-149(*)/USM-159, location of parts, right-side view.
Figure 6-4. Frequency Meter FR-149(*)/USM-159, location of parts, rear view.
Figure 6-5. Frequency Meter FR-149/USM-159, location of parts, bottom view.
Section III. TROUBLESHOOTING - TM-11-6625-486-14-P0056
Checking B + Circuits for Shorts
Table 6-3. Troubleshooting
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0059
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0060
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0061
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0062
Signal Tracing Procedures
Figure 6-7. Crystal oscillator signal tracing.
Tracing Crystal Oscillator Signal.
Figure 6-8. Modulator signal tracing.
Signal Tracing of Internally Generated Signals Through Audio Amplifier
Figure 6-10. Mixer signal tracing.
Audio Power Output Test
Removal and Replacement of Audio Amplifier Circuit Board
Removal and Replacement of Low Frequency Vfo Circuit Board
Removal and Replacement of Other Components
Figure 6-11. Filmstrip mechanism, left side view.
Figure 6-12. Filmstrip mechanism, right-side view.
Figure 6-13. Dial lamp and filmstrip, installation diagram.
Equipment Adjustments
Figure 6-14. Crystal oscillator alignment setup.
Adjustment of Low Frequency Vfo
Section V. GENERAL SUPPORT TESTING PROCEDURES
Modification Work Orders
Figure 6-16. Frequency drift with change in line voltage test setup.
Table 6-5. Frequency Drift with Change in Line Voltage Test
Figure 6-17. Crystal oscillator frequency test setup
Crystal Checkpoint and Vfo Calibration
Figure 6-18. Frequency range of corrector test setup.
Frequency Resetability
Dial Lock Frequency Shift
Figure 6-20. Dial lock frequency shift and modulator repetition rate test setup.
Modulator Repetition Rate
Figure 6-21. Spurious crystal checkpoint rejection test set up.
Audio Power Outpu t With Internal Crystal Oscillator Test
Figure 6-22. Audio power output with internal crystal oscillator test setup.
Table 6-13. Audio Power Output With Internal Crystal Oscillator Test
Audio Power Output With External Rf Input Signal Test
Figure 6-23. Audio power output with external rf input signal test setup.
Table 6-14. Audio Power Output With External Rf Input Signal Test
Table 6-14. Audio Power Output With External Rf Input Signal Test-continued
Performance Test Summary
Figure 6-24. FR-149/USM-159, low frequency ufo circuit wiring diagram.
Figure 6-25. FR-149A/USM-159 and FR-149B/USM-159, low frequency ufo circuit wiring diagram.
Figure 6-27. FR-149A/USM-159 and FR-149B/USM-159, mixer circuit wiring diagram.
Figure 6-28. FR-149/USM-159, crystal oscillator and modulator circuit wiring diagram.
Figure 6-29. FR-149A/USM-159A and FR-149B/USM-159, crystal oscillator and modulator circuit wiring diagram.
Figure 6-31. FR-149B/USM-159, audio amplifier circuit wiring diagram.
Figure 6-32. FR-149(*)/USM-159, power supply circuit wiring diagram.
APPENDIX A. REFERENCES - TM-11-6625-486-14-P0107
APPENDIX C. MAINTENANCE ALLOCATION
Tool and Test Equipment Requirements (Table 1)
SECTION II MAINTENANCE ALLOCATION CHART FOR AN/USM-159, AN/USM-159A, AN/USM-159B
SECTION II MAINTENANCE ALLOCATION CHART FOR AN/USM-159, AN/USM-159A, AN/USM-159B-continued
TABLE I. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR AN/USM-159, AN/USM-159A, AN/USM-159B
APPENDIX D. ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LISTS
How to Locate Repair Parts - TM-11-6625-486-14-P0116
Figure D-1. Frequency Meter AN/USM-159, AN/USM-159A and AN/USM-159B.
GROUP 00 FREQUENCY METER AN/USM-159, AN/USM-159A, AN/USM-159B
Figure D-2. Frequency Meter FR-149()/USM-159 (Sheet 1 of 4).
Figure D-2. Frequency Meter FR-149()/USM-159 (Sheet 2 of 4).
Figure 2. Frequency Meter FR-149()/USM-159 (Sheet 3 of 4).
Figure 2. Frequency Meter FR-149()/USM-159 (Sheet 4 of 4).
GROUP 01 FREQUENCY METER FA-149( )/USM159
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0126
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0127
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0128
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0129
Figure D-3. Audio Amplifier.
GROUP 0101 AUDIO AMPLIFIER
Figure D-4. Crystal Oscillator and Modulator.
GROUP 0102 CIYSTAL OSCILLATOR AND MODULATOR
Figure D-5. Mixer.
GROUP 0103 MIXER
Figure D-6. Power Supply.
GROUP 0104 POWER SUPPLY
Figure D-7. Oscillator Network Assembly.
GROUP 0105 OSCILLATOR NETWORK ASSEMBLY
Figure D-8. Variable Frequency Oscillator.
GROUP 010501 VAIAILE FRQUENCY OSCILLATOR
Figure D-9. Film Drive Assembly (Sheet 1 of 2).
Figure D-9. Film Drive Assembly (Sheet 2 of 2).
GROUP 0106 FILM DRIVE ASSEMBLY
GROUP 0106 FILM DRIVE ASSEMBLY-continued - TM-11-6625-486-14-P0146
GROUP 0106 FILM DRIVE ASSEMBLY-continued - TM-11-6625-486-14-P0147
Figure D-10. Capacitor Assembly (Sheet 1 of 2).
Figure D-10. Capacitor Assembly (Sheet 2 of 2)
GROUP 0107 CAPACITOR ASSENSLY
Figure D-11. Oscillator Assembly.
GROUP 010701 OSCILLATOR ASSEMBLY
Figure D-12. Ceramic Plate Assembly.
GROUP 01070101 CERAMIC PLATE ASSEMBLY
Figure D-13. Plate Case Assembly.
GROUP 01070102 PLATE CASE ASSEMBLY
Figure D-14. Shaft Assembly.
GROUP 010702 SHAFT ASSEMBLY
Figure D-15. Rear Panel Assembly.
GROUP 0108 REAR PANEL ASSEMBLY
Figure D-16. Battery Box Assembly.
GROUP 0109 BATTERY BOX ASSEMBLY
Figure D-17. Antenna Assembly AT-564( )/U.
GROUP 02 ANTENNA ASSEMBLY AT-564 ( )/U
Figure D-18. Case and Cover Assembly.
GROUP 03 CASE AND COVER ASSEMBLY
Figure D-19. Case Assembly.
GROUP 0301 CASE ASSEMBLY
Figure D-20. Cover Assembly.
GROUP 0302 COVER ASSEMBLY
Figure D-21. Cable Assembly, Power Electrical CX-7782/USM-159.
GROUP 04 CABLE ASSEMBLY, POWER ELECTRICAL CX-7782/USM-159 OR CX-12005/USM-159
Figure D-22. Cable Assembly, Power Electrical CX-12005/USM-159.
Parts Lists
Figure D-23. Cord Assembly CG-409/U.
GROUP 05 CORD ASSEMBLY CG-409/U
Figure D-24. Cord Assembly CD-307A.
GROUP 06 CORD ASSEMBLY CO-307A
NATIONAL STOCK NUMBER AND PART NUMBER INDEX - TM-11-6625-486-14-P0180
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0181
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0182
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0183
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0184
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0185
TM-11-6625-486-14-P Frequency Meters AN/USM-159 AN/USM-159A AND AN/USM-159B Manual
CHAPTER 1. INTRODUCTION - TM-11-6625-486-14-P0013
Section II. DESCRIPTION AND DATA
Description
CHAPTER 2. SERVICE UPON RECEIPT AND INSTALLATION
Figure 2-1. AN/USM-159 (*), packing diagram.
Section II. INSTALLATION
CHAPTER 3. OPERATING INSTRUCTIONS
Figure 3-2. FR-149A/USM-159 and FR-149B/USM-159, controls and indicators.
Section II. OPERATION UNDER USUAL CONDITIONS
Figure 3-3. Interpretation of filmstrip.
Figure 3-4. FR-149(*)/USM-159, calibration tables.
Determining Local Transmitter Frequency When Approximate Frequency is Known
Determining Frequency of Distant Transmitter
Tuning Transmitter to Desired Frequency
Section III. OPERATION UNDER UNUSUAL CONDITIONS
CHAPTER 4. OPERATOR'S AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section III. TROUBLESHOOTING - TM-11-6625-486-14-P0032
Section IV. MAINTENANCE OF FREQUENCY METER
CHAPTER 5. FUNCTIONING OF EQUIPMENT
Figure 5-1. FR-149(*)/USM-159, block diagram.
Figure 5-2. FR-149/USM-159, crystal oscillator, schematic diagram.
Crystal Oscillator Circuit
Figure 5-4. FR-149/USM-159 low frequency oscillator schematic diagram.
Low Frequency Oscillator Circuit
Figure 5-6. FR-149/USM-159 high frequency oscillator, schematic diagram.
High Frequency Oscillator
Figure 5-8. FR-149/USM-159, mixer circuit, schematic diagram.
Mixer Circuit
Crystal Oscillator signal
Audio Amplifier Circuit
Modulator and Dial Lamp Power Circuit
Figure 5-12. FR-149/USM-159 regulated power supply and voltage distribution circuit, schematic diagram.
Figure 5-13. FR-149A/USM-159 and FR-149B/USM-159 regulated power supply and voltage distribution circuit, schematic diagram.
Regulated Power Supply and Voltage Distribution Circuit
CHAPTER 6. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Table 6-2. Dc Resistances of Transformers and Coils
Figure 6-2. Frequency Meter FR-149(*)/USM-159, location of parts, right-side view.
Figure 6-4. Frequency Meter FR-149(*)/USM-159, location of parts, rear view.
Figure 6-5. Frequency Meter FR-149/USM-159, location of parts, bottom view.
Section III. TROUBLESHOOTING - TM-11-6625-486-14-P0056
Checking B + Circuits for Shorts
Table 6-3. Troubleshooting
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0059
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0060
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0061
Table 6-3. Troubleshooting-continued - TM-11-6625-486-14-P0062
Signal Tracing Procedures
Figure 6-7. Crystal oscillator signal tracing.
Tracing Crystal Oscillator Signal.
Figure 6-8. Modulator signal tracing.
Signal Tracing of Internally Generated Signals Through Audio Amplifier
Figure 6-10. Mixer signal tracing.
Audio Power Output Test
Removal and Replacement of Audio Amplifier Circuit Board
Removal and Replacement of Low Frequency Vfo Circuit Board
Removal and Replacement of Other Components
Figure 6-11. Filmstrip mechanism, left side view.
Figure 6-12. Filmstrip mechanism, right-side view.
Figure 6-13. Dial lamp and filmstrip, installation diagram.
Equipment Adjustments
Figure 6-14. Crystal oscillator alignment setup.
Adjustment of Low Frequency Vfo
Section V. GENERAL SUPPORT TESTING PROCEDURES
Modification Work Orders
Figure 6-16. Frequency drift with change in line voltage test setup.
Table 6-5. Frequency Drift with Change in Line Voltage Test
Figure 6-17. Crystal oscillator frequency test setup
Crystal Checkpoint and Vfo Calibration
Figure 6-18. Frequency range of corrector test setup.
Frequency Resetability
Dial Lock Frequency Shift
Figure 6-20. Dial lock frequency shift and modulator repetition rate test setup.
Modulator Repetition Rate
Figure 6-21. Spurious crystal checkpoint rejection test set up.
Audio Power Outpu t With Internal Crystal Oscillator Test
Figure 6-22. Audio power output with internal crystal oscillator test setup.
Table 6-13. Audio Power Output With Internal Crystal Oscillator Test
Audio Power Output With External Rf Input Signal Test
Figure 6-23. Audio power output with external rf input signal test setup.
Table 6-14. Audio Power Output With External Rf Input Signal Test
Table 6-14. Audio Power Output With External Rf Input Signal Test-continued
Performance Test Summary
Figure 6-24. FR-149/USM-159, low frequency ufo circuit wiring diagram.
Figure 6-25. FR-149A/USM-159 and FR-149B/USM-159, low frequency ufo circuit wiring diagram.
Figure 6-27. FR-149A/USM-159 and FR-149B/USM-159, mixer circuit wiring diagram.
Figure 6-28. FR-149/USM-159, crystal oscillator and modulator circuit wiring diagram.
Figure 6-29. FR-149A/USM-159A and FR-149B/USM-159, crystal oscillator and modulator circuit wiring diagram.
Figure 6-31. FR-149B/USM-159, audio amplifier circuit wiring diagram.
Figure 6-32. FR-149(*)/USM-159, power supply circuit wiring diagram.
APPENDIX A. REFERENCES - TM-11-6625-486-14-P0107
APPENDIX C. MAINTENANCE ALLOCATION
Tool and Test Equipment Requirements (Table 1)
SECTION II MAINTENANCE ALLOCATION CHART FOR AN/USM-159, AN/USM-159A, AN/USM-159B
SECTION II MAINTENANCE ALLOCATION CHART FOR AN/USM-159, AN/USM-159A, AN/USM-159B-continued
TABLE I. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR AN/USM-159, AN/USM-159A, AN/USM-159B
APPENDIX D. ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LISTS
How to Locate Repair Parts - TM-11-6625-486-14-P0116
Figure D-1. Frequency Meter AN/USM-159, AN/USM-159A and AN/USM-159B.
GROUP 00 FREQUENCY METER AN/USM-159, AN/USM-159A, AN/USM-159B
Figure D-2. Frequency Meter FR-149()/USM-159 (Sheet 1 of 4).
Figure D-2. Frequency Meter FR-149()/USM-159 (Sheet 2 of 4).
Figure 2. Frequency Meter FR-149()/USM-159 (Sheet 3 of 4).
Figure 2. Frequency Meter FR-149()/USM-159 (Sheet 4 of 4).
GROUP 01 FREQUENCY METER FA-149( )/USM159
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0126
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0127
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0128
GROUP 01 FREQUENCY METER FA-149( )/USM159-continued - TM-11-6625-486-14-P0129
Figure D-3. Audio Amplifier.
GROUP 0101 AUDIO AMPLIFIER
Figure D-4. Crystal Oscillator and Modulator.
GROUP 0102 CIYSTAL OSCILLATOR AND MODULATOR
Figure D-5. Mixer.
GROUP 0103 MIXER
Figure D-6. Power Supply.
GROUP 0104 POWER SUPPLY
Figure D-7. Oscillator Network Assembly.
GROUP 0105 OSCILLATOR NETWORK ASSEMBLY
Figure D-8. Variable Frequency Oscillator.
GROUP 010501 VAIAILE FRQUENCY OSCILLATOR
Figure D-9. Film Drive Assembly (Sheet 1 of 2).
Figure D-9. Film Drive Assembly (Sheet 2 of 2).
GROUP 0106 FILM DRIVE ASSEMBLY
GROUP 0106 FILM DRIVE ASSEMBLY-continued - TM-11-6625-486-14-P0146
GROUP 0106 FILM DRIVE ASSEMBLY-continued - TM-11-6625-486-14-P0147
Figure D-10. Capacitor Assembly (Sheet 1 of 2).
Figure D-10. Capacitor Assembly (Sheet 2 of 2)
GROUP 0107 CAPACITOR ASSENSLY
Figure D-11. Oscillator Assembly.
GROUP 010701 OSCILLATOR ASSEMBLY
Figure D-12. Ceramic Plate Assembly.
GROUP 01070101 CERAMIC PLATE ASSEMBLY
Figure D-13. Plate Case Assembly.
GROUP 01070102 PLATE CASE ASSEMBLY
Figure D-14. Shaft Assembly.
GROUP 010702 SHAFT ASSEMBLY
Figure D-15. Rear Panel Assembly.
GROUP 0108 REAR PANEL ASSEMBLY
Figure D-16. Battery Box Assembly.
GROUP 0109 BATTERY BOX ASSEMBLY
Figure D-17. Antenna Assembly AT-564( )/U.
GROUP 02 ANTENNA ASSEMBLY AT-564 ( )/U
Figure D-18. Case and Cover Assembly.
GROUP 03 CASE AND COVER ASSEMBLY
Figure D-19. Case Assembly.
GROUP 0301 CASE ASSEMBLY
Figure D-20. Cover Assembly.
GROUP 0302 COVER ASSEMBLY
Figure D-21. Cable Assembly, Power Electrical CX-7782/USM-159.
GROUP 04 CABLE ASSEMBLY, POWER ELECTRICAL CX-7782/USM-159 OR CX-12005/USM-159
Figure D-22. Cable Assembly, Power Electrical CX-12005/USM-159.
Parts Lists
Figure D-23. Cord Assembly CG-409/U.
GROUP 05 CORD ASSEMBLY CG-409/U
Figure D-24. Cord Assembly CD-307A.
GROUP 06 CORD ASSEMBLY CO-307A
NATIONAL STOCK NUMBER AND PART NUMBER INDEX - TM-11-6625-486-14-P0180
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0181
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0182
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0183
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0184
NATIONAL STOCK NUMBER AND PART NUMBER INDEX-continued - TM-11-6625-486-14-P0185
TM-11-6625-486-14-P Frequency Meters AN/USM-159 AN/USM-159A AND AN/USM-159B Manual
