TM-11-5820-398-35

• FIELD AND DEPOT MAINTENANCE MANUAL RADIO SET AN/PRC-25
• WARNING
• Field and Depot Maintenance Manual is changed as follows
• Figrue 5.1. Tone squelch module A24, late model, schematic diagram
• Tone Generator Module A23 (Early Model)
• Figure 7. Tone generator module A23, early model, schematic diagram
• Figure 7.1. Tone generator module A23, late model, schematic diagram
• Late Models
• Figure 22.1. Fss IF module A18, Late Model, schematic diagram
• Figure 25.1. Voltage regulator module A16, late Model, schematic diagram
• Figure 683.1. Module A16, late model, parts location
• Figure 70.1. Module A18, late model, parts location
• Figure 75. Module A23, early model, parts location
• Figure 75.1. Module A23, late model, parts location
• Field and Depot Maintenance Manual is changed as follows
• Figure 10.1. Variable frequency oscillator A9, Order No. 64009-PP-65, improved schematic diagram
• Note
• Figure 61.1. Module A9, Order No. 64009-PP-63, improved module, parts location
• CHAPTER 6. DEPOT INSPECTION STANDARDS
• Additional Equipment-continued
• Figure 79.1. Test cables No. 1, No. 2, and No. 3.
• Figure 79.2. Test cables No. 4, No.5, and No.6.
• Figure 79.3. Test cables No. 7, No. 8, and No. 9.
• Figure 79.4. Receiver dummy antenna, schematic and wiring diagrame.
• Figure 79.5 Transmitter dummy load adapters, fabrication and connection details
• Figure 79.6. Test assembly, schematic/wiring diagram.
• General Test Requirements
• Figure 79.7. RT-505/PRC-25, receiver test setup
• Transmitter Test Setup
• Figure 79.8. RT-505/PRC-25, Transmitter Test Setup
• Catching Range Test.
• Selectivity Test.
• Transmitter System Tests, Radio Set AN/PRC-25
• Sidetone Test
• Catching Range Test.
• Miscellaneous System Tests and Inspection, Radio Set AN/PRC-25
• RADIO SET AN/PRC-25
• CHAPTER 1. INTRODUCTION
• CHAPTER 2. THEORY
• Transmitting Signal Path
• Frequency Synthesizer System-continued
• Section II. CIRCUIT ANALYSIS
• Second Rf Amplifier Module A4
• Figure 1. First rf amplifier module A3, schematic diagram
• Figure 2. Second rf amplifier module A4, schematic diagram
• Figure 3. Receiver mixer module A5, schematic diagram.
• Receiver Audio Amplifier Module A25
• Figure 4. Receiver audio amplifier module A25, schematic diagram.
• Speech Amplifier Limiter Module A22
• Figure 6. Speech amplifier limiter module A22, schematic diagram.
• Tone Generator Module A23
• Variable Frequency Oscillator Module A9
• Figure 8. Sidestep oscillator module A20, schematic diagram.
• Transmitter First Rf Amplifier Module A8
• Figure 10. Variable frequency oscillator module A9, schematic diagram
• Figure 11. Transmitter first rf amplifier module A8, schematic diagram
• Transmitter Second Rf Amplifier Module A7
• Transmitter Intermediate Power Amplifier Module A6
• Power Amplifier Tank Module A2
• Antenna Looding Network A28
• Frequency Synthesizer System First Mixer Module A14
• Figure 16. Antenna loading network A28, schematic diagram
• 1-Mc Spectrum Generator Module A15
• Figure 18. 1-mc spectrum generator module A15, schematic diagram.
• Frequency Synthesizer System Second Mixer Module A12
• Figure 19. Interval oscillator module A10, schematic diagram
• Frequency Synthesizer System If. Amplifier Module A18
• Phase Comparator Module A17
• Figure 22. Speech amplifier limiter module A18, schematic diagram.
• Frequency Synthesizer System Discriminator Driver Module All
• Voltage Regulator Module A16
• Dc-to-Dc Converter Module Al
• Test Points
• Figure 26. Dc-to-dc converter module A1, schematic diagram.
• Power Distribution
• Receive
• CHAPTER 3. THIRD ECHELON MAINTENANCE
• Figure 27. Typical module extender for module A20.
• Test Setup
• Localizing and Isolating Troubles
• Troubleshooting chart for receiver section of R T-505/PRC-25-continued
• Troubleshooting chart for receiver section of R T-505/PRC-25-continued
• Troubleshooting chart for receiver section of R T-505/PRC-25-continued
• Troubleshooting chart for transmitter section of RT-505/PRC-25.
• Troubleshooting chart for transmitter section of RT-505/PRC-25-continued
• Troubleshooting chart for transmitter section of RT-505/PRC-25-continued
• Isolating Trouble in Transmitter Power Amplifier Circuit
• Section III. THIRD ECHELON REPAIRS
• Removal and Replacement of Audio and Control Chassis A27
• Figure 30. Receiver-Transmitter, Radio RT-505/PRC-25, bottom view.
• Figure 31. Receiver-Transmitter, Radio RT-505/PRC-25, bottom view, modules removed.
• Figure 32. Receiver-Transmitter, Radio RT-505/PRC-25, top view.
• Figure 33. Receiver-Transmitter, Radio RT-505/PRC-25, top view, modules removed.
• Section IV. THIRD ECHELON ALIGNMENT
• Alignment of Variable Frequency Oscillator Module A9
• CHAPTER 4. FOURTH ECHELON MAINTENANCE
• Figure 35. Receiver-Transmitter, Radio RT-505/PRC-25, bottom view disassembly
• Figure 37. Receiver-Transmitter, Radio RT-505/PRC-25, front panel, tuning knobs removed.
• Removal and Replacement of Selector Mechanism
• Figure 38. Front panel, rear view.
• Section II. FOURTH ECHELON ALIGNMENT
• Alignment of Tuning Capacitor C2
• Fabrication of Test Cables and Dummy Antenna
• Physical Tests and Inspection
• Figure 42. Transmitter power output test setup
• Transmitter Power Output Test
• Figure 43. Tone Oscillator frequency and transmitter modulation test setup
• Tone Oscillator Frequency and Transmitter Modulation Test
• Figure 44. System distortion test setup
• System Distortion Test
• Figure 45. Frequency accuracy test setup
• Frequency Accuracy Test
• Figure 46. Maximum signal plus noise-to-noise ratio setup
• Maximum Signal Plus Noise-to-Noise Ratio Test
• Figure 47. Receiver audio output power test setup
• Receiver Audio Output Power Test
• Figure 48. Receiver sensitivity test setup
• Receiver Sensitivity Test
• Figure 49. Receiver catching range test setup
• Receiver Catching Range Test
• Figure 50. Squelch sensitivity test setup
• Squelch Sensitivity Test
• Figure 51. Receiver distortion test setup
• Receiver Distortion Test
• Figure 52. Transmitter deviation test setup
• Transmitter Deviation Test
• Summary of Test Data
• CHAPTER 5. FIFTH ECHELON MAINTENANCE
• Isolating Trouble in Module A2
• Figure 53. Module A1 parts location.
• Isolating Trouble Within Modules A3 and A4
• Figure 54. Module A2 parts location.
• Faulty Parts Isolation.
• Isolating Trouble in Module AS
• Figure 56. Module Ad parts location.
• Isolating Trouble in Module A6
• Faulty Parts Isolation.
• Isolating Trouble in Module A7
• Signal voltage chart.
• Isolating Trouble in Module A8
• Figure 59. Module A7, parts location.
• Isolating Trouble in Module A9
• Figure 60. Module A8, parts location.
• Preparation for Alignment.
• Isolating Trouble in Module A10
• Figure 61. Module A9, parts location.
• Isolating Trouble in Module A11
• Figure 62. Module A10, parts location.
• Isolating Trouble in Module A12
• Isolating Trouble in Module A13
• Figure 65. Module A13, parts location.
• Isolating Trouble in Module A14
• Isolating Trouble in Module A15
• Isolating Trouble in Module A17
• Isolating Troubles in Module A18
• Figure 69. Module A17, parts location
• Isolating Troubles in Module A19
• Isolating Troubles in Module A20
• Figure 71. Module A19, parts location
• Isolating Trouble in Module A21
• Signal voltage chart.
• Isolating Troubles in Module A22
• Isolating Trouble in Module A23
• Isolating Troubles in Module A24
• Isolating Trouble in Module A25
• Selector Mechanism Disassembly Procedure
• Figure 77. Module A25, parts location
• Selector Mechanism Reassembly Procedure
• Disassembly and Reassembly of Interval Oscillator Module A10
• Figure 78. Selector mechanisrn, exploded view.
• Assembly.
• Figure 79. Module A10, exploded view.
• Figure 80. MIL STD resistor color code.
• Figure 81. MIL STD capacitor color codes
• Figure 82. Receiver-transmitter block diagram, received signal paths
• Figure 83. reciver-transmitter block diagram, transmitted signal paths
• Figure 84. Frequency synthesizer system, block diagram
• Figure 85. Receiver if. amplifier module A21, schematic diagram
• Figrue 86. Power distribution, receive condition, simplified schematic diagram
• Figure 87. Power distribution, transmit condition, simplified schematic diagram
• Figure 88. Receiver-Transmitter, Radio RT-505/PRC-25, overall schematic diagram
• APPENDIX A. REFERENCES
• INDEX
• INDEX-continued
• INDEX-continued
• INDEX-continued
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• Distribution
• TM-11-5820-398-35
• Distribution
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• Distribution
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