TM-11-6625-351-35

• FIELD AND DEPOT MAINTENANCE MANUAL: RADIO INTERFERENCE MEASURING SET AN/URM-85
• WARNING
• Chapter 5. DEPOT OVERHAUL STANDARDS
• General Requirements
• Audio Amplifier Response Test
• Linearity Test
• Impulse Generator Test
• Impulse Noise Sensitivity Test
• IF Rejection Test
• Calibration as Two-Terminal RF Voltmeter
• Figure 95.3. Test setup for calibrating tuning unit as two-terminal voltmeter.
• RADIO INTERFERENCE MEASURING SET AN/URM-85
• Appendix. REFERENCES
• REFERENCES (cont)
• Field and Depot Maintenance Manual
• Figure 2. Shunt method of calibration, using incoming RF signal.
• Chapter 5. DEPOT OVERHAUL STANDARDS
• Test Facilities Required
• General Requirements
• Dial Calibration Accuracy Test
• Audio Amplifier Response Test
• Linearity Test
• Gain Versus Frequency Test
• Impulse Noise Sensitivity Test
• IF Rejection Test
• RF-IF Attenuator Test
• Figure 95.4. Test setup for calibrating tuning unit as two-terminal voltmeter.
• Bandwidth Test
• Table of Contents
• CHAPTER 1. THEORY
• Shunt Method of Calibration Using Internal Signal Source
• Figure 1. Shunt method of calibration, using internal signal source.
• Coaxial Relays and Attenuators.
• Shunt Method of Calibration Using Incoming Rf Signal
• Series Method of Calibration
• Figure 2. Shunt method of calibration, using incoming rf signal.
• Figure 3. Series method of calibration.
• Introduction to Unit Theory
• Section II. THEORY OF MAIN UNIT
• Block Diagram of Signal Attenuator AT702 Circuitry
• Figure 4. SIGNAL ATTENUATOR DB control circuitry, block diagram
• Block Diagram of Power Supply
• Figure 6. Power supply, block diagram.
• Power Supply, Analysis of Input Circuits
• Figure 6. Power supply, simplified schematic diagram
• Power Supply, Analysis of Output Circuits
• 1.2- Volt Dc Power Circuit for Electrometer V4
• Audio Amplifier, Stage Analysis
• Meter Cathode Follower V702 and Metering Circuit, Stage Analysis
• CW AVERAGE Position of Function Switch
• Figure 8. Cathode follower and meter circuit, CW AVERAGE position of function switch
• CW PEAK Position of Function Switch
• Figure 9. Cathode follower and meter circuit, CW PEAK position of function switch.
• Figure 10. Cathode follower and meter circuit, ZERO ADJ position of function switch.
• Figure 11. Cathode follower and meter circuit, PULSE PEAK position of function switch.
• METERED SLIDEBACK Position of Function Switch
• Figure 12. Cathode follower and meter circuit, METERED SLIDEBACK position of function switch
• Impulse Generator Circuit
• Impulse Generator Driver Stage V703B
• Coaxial Relays and Attenuators
• Figure 14. Coaxial relays and attenuators, simplified schematic diagram.
• Section III. THEORY OF TUNING UNIT 1
• Figure 15. Tuning unit 1, block diagram
• Rf Tuner Section, Detailed Analysis
• Figure 16. Tuning unit 1 rf oscillator, mixer, and oscillator, simplified schematic diagram.
• If. Input Selector, Detailed Analysis
• Figure 17. Tuning unit 1 if. input selector and if. step attenuator, schematic diagram.
• If. Step Attenuator, Detailed Analysis
• If. Amplifier, 455-Kc, Detailed Analysis
• Figure 18. Tuning unit 1, 455-kc if. amplifier and if output selector
• If. Output Selector
• Figure 19. Detector and electrometer assembly, schematic diagram
• Electrometers 3 and V4, Circuit Description
• Audio Detector VI
• Rf Tuner, Analysis of 20-70-Mc Amplifiers
• Figure 20. Tuning unit 2, block diagram
• Figure 21. First and second rf amplifiers (20-70 mc), schematic diagram.
• Figure 22. Tuning unit 2, mixer and oscillator (20-70 mc), schematic diagram.
• Rf Tuner, Analysis of 70-220-Mc Amplifiers
• Figure 23. First and second rf amplifiers (70-220 mc), schematic diagram.
• Figure 24. Tuning unit 2, mixer and oscillator (70-220 mc), schematic diagram.
• Figure 25. Tuning unit 2, if. step attenuator with if. amplifiers V207 and V208, schematic diagram
• If. Amplifier, Detailed Analysis
• If. Amplifiers K207 and V208
• Detector and Electrometer Assembly A201
• Section V. THEORY OF TUNING UNIT 3
• RF Amplifier V401, Detailed Analysis
• Amplifier Circuit
• Figure 28. Tuning unit 3 rf amplifier and oscillator, schematic diagram.
• Crystal Mixer Circuit, Detailed Analysis
• If. Preamplifier, Detailed Analysis
• Figure 29. Tuning unit 3, if. amplifier, schematic diagram
• Figure 30. Tuning unit 3, second if. amplifier V405 and if. step attenuator, schematic diagram.
• If. Step Attenuator AT401
• Figure 32. Tuning unit 3, sixth if. amplifier V409 and cathode follower V410, schematic diagram.
• Section VI. THEORY OF TUNING UNIT 4
• Figure 33. Tuning unit 4, block diagram
• Rf Tuner, 700-1,000 Mc, Introduction
• Circuit Analysis, Static Condition.
• Figure 34. Tuning unit 4, rf ampiifier and oscillator (700-1,000 mc), simplified sthematic diagram.
• Rf Tuner, 700-1,000 Mc, Dynamic Circuit Analysis
• Rf Tuner, 400-700 Mc, Introduction
• Figure 36. Tuning unit 4, rf amplifier and oscillator (400-700 mc), simplified schematic diagram.
• Circuit Analysis, Static Condition.
• Rf Tuner, 400-700 Mc, Dynamic Circuit Analysis
• If. Preamplifier, Detailed Analysis
• If. Step Attenuator AT501
• Section VII. THEORY OF MINOR COMPONENTS
• Coupler, Antenna CU-890/URM-85
• Figure 37. Coupler, Antenna CU-890/URM-85, schematic diagram.
• Figure 38. Signal pickup devices, schematic diagrams.
• Minor Components for Use with Tuning Units 2, 3, and 4
• Coupler Antenna CU-893/URM-85
• Minor Electrical Components for Use with All Tuning Units
• Multimeter, Remote ME-204/URM-85
• Transformer, Power, Isolation and Step-Down TF-248/G
• Figure 40. Transformer, Power, Isolation and Step-Down TF-248/G, schematic diagram.
• Chapter 2. TROUBLESHOOTING
• Resistance measurements
• Figure 41. Tube socket voltage and resistance diagram, main unit chassis, bottom view.
• Figure 42. Tube socket resistance diagram, upper deck of main unit, top view.
• Figure 43. Voltage and resistance diagram, main unit terminal boards, bottom of chassis
• Figure 44. Voltage and resistance diagram, main unit terminal boards, top of chassis
• Figure 45. Voltage and resistance diagram, main unit filter box assembly
• Figure 46. Use of the test harness.
• Figure 47. Voltage and resistance diagram, tuning unit 1.
• Figure 48. Voltage and resistance diagram, tuning unit 2.
• Figure 49. Voltage and resistance diagram, tuning unit 3, showing outline of type 6299 coplanar electron tube
• Figure 50. Voltage and resistance diagram, tuning unit 4.
• Section Il. TROUBLESHOOTING TEST SET
• Troubleshooting
• Main unit, with tuning unit 1 interconnected by test harness (fig. 46).
• Main unit, with tuning unit 1 interconnected by test harness (fig. 46). (cont)
• Main unit, with tuning unit 1 interconnected by test harness (fig. 46). (cont)
• Figure 51. Main unit removed from dust cover, parts location diagram
• Figure 52. Main unit, top of chassis, parts location diagram
• Figure 53. Main unit, rotary switches S702, S707, and S708, parts location diagram.
• Figure 54. Voltage regulator assembly, parts location diagram.
• Figure 55. Main unit, bottom of chassis, parts location diagram.
• Tuning unit 1.
• Tuning unit 1. (Cont)
• Tuning unit 1. (Cont)
• Figure 56. Tuning unit, parts location diagram
• Figure 57. Tuning unit 1, rf tuner chassis, parts location diagram.
• Figure 58. Tuning unit 1, turret tuner segments, parts location diagram.
• Figure 61. Tuning unit 1, 1,600-kc if. amplifier. parts location diagram.
• Tuning unit 2.
• Tuning unit 2. (cont)
• Tuning unit 2. (cont)
• Figure 64. Tuning unit 2, parts location diagram
• Figure 65. Tuning unit 2, rf tuner cover removed, parts location diagram
• Figure 67. Tuning unit 2, if. amplifier, parts location diagram.
• Tuning unit 3
• Tuning unit 3 (cont)
• Tuning unit 3 (cont)
• Figure 68. Tuning unit 3, parts location diagram
• Figure 69. Tuning unit 3, interior of rf tuner, parts location diagram.
• Figure 71. Tuning unit 3, if. amplifier, parts location diagram.
• Tuning unit 4.
• Tuning unit 4. (cont)
• Tuning unit 4. (cont)
• Tuning unit 4. (cont)
• Tuning unit 4. (cont)
• Figure 72. Tuning unit 4, parts location diagram
• Figure 73. Tuning unit 4, rf tuner (400 to 700 mc), parts location diagram.
• Figure 74. Tuning unit 4, rf tuner (700 to 1,000 mc), parts location diagram.
• Figure 76. Tuning unit 4, if. amplifier, parts location diagram.
• Dc Resistances of Tuning Unit Multi pin Connectors
• Figure 77. If. transformers (bottom view), key to terminal identification.
• Signal Substitution Technique
• Signal Substitution, Tuning Unit 1
• Rf Chart
• Rf Chart (cont)
• Figure 78, Test setup for tuning unit 1, rf tuner section.
• If. Test Procedure.
• Signal Substitution, Tuning Unit 3
• Rf Chart (fig. 69)
• Signal Substitution, Tuning Unit 4
• If Test Procedure.
• Overall Gain Measurements
• Typical Combined Rf Tuner and If. Amplifier Gain Data.
• Chapter 3. REPAIRS AND ALIGNMENT
• Figure 79. Test setup for checking tuning unit 1 minor components.
• Coupler, Antenna CU-890/URM-8~for Vertical Antenna
• Figure 80. Couplers, Radio Frequency Interference CU-891/URM-85 and CU-892/URM-85 parts location diagram.
• Figure 81. Coupler, Antenna CU-890/URM-85 for vertical antenna, parts location diagram.
• Figure 82. Reflector, Antenna AT-1027/URM-86, parts location diagram.
• Replacement of Parts, Minor Components for Use with Tuning Units 2, 3, and 4
• Figure 83. Loop Antenna AT-1028/URM-85, Parts location diagram
• Figure 84. Couplers, Radio Frequency Interference CU-896/URM and CU-897/URM-85, parts location diagram.
• Coupler, Radio Frequency Interference CU-897/URM-85
• Couplers, Antenna CU-893/URM-85 and C CU-894/URM-85
• Antenna AS-1158/URM-85 and Coupler, Antenna CU-895/URM-85
• Figure 86. Couplers, A n t e n n a CU-893/URM-86 and CU-894/URM-85, parts location diagram.
• Tuning Unit 4 Antenna A T-1030/URM-85
• Replacement of Parts, Minor Components-for Use with All Tuning Units
• Figure 86. Tuning unit 4 Antenna AT-1030/URM-86, parts location diagram.
• Figure 87. Multimeter, Remote ME-204/URM-86, parts location diagram.
• Disassembly Procedure for Six-Step Signal Attenuator AT702
• Figure 89. Transformer. Power, Isolation and Step-Down TF-248/G, parts location diagram.
• Reassembly Procedure for Six-Step Signal Attenuator AT702
• Figure 90. Six-step signal attenuator AT702, parts location diagram.
• Replacement of Fixed20-DB Attenuator AT701
• Replacement of Parts, Tuning Units
• Tuning Unit 2
• Section II. ALIGNMENT
• Characteristics and Use of Laboratory Test Equipment, and Special Tools Required for Alignment
• If. Amplifier Alignment, Tuning Unit I, General
• Alignment of 455-Kc If. Amplifier
• Alignment of Rf Tuner Section, Tuning Unit 1
• Alignment of Rf Tuner Section, Tuning Unit 1 (cont)
• Alignment of Rf Tuner Section, Tuning Unit 1 (cont)
• If. Amplifier Alignment, Tuning Unit 2, General
• Figure 91. Test setup for if. amplifier alignment, tuning units 2 and 4.
• Using Tuning Wand
• Alignment of Rf Tuner Section, Tuning Unit 2
• Alignment of Rf Tuner Section, Tuning Unit 2 (cont)
• If. Amplifier Alignment, Tuning Unit 3, General
• Alignment of 42-Mc If. Amplifiers
• Alignment of Rf Tuner Section, Tuning Unit 3
• Alignment of Rf Tuner Section, Tuning Unit 3 (cont)
• Alignment of Rf Tuner Section, Tuning Unit 3 (cont)
• Alignment of Rf Tuner Section, Tuning Unit 3 (cont)
• If. Amplifier Alignment, Tuning Unit 4, General
• Alignment of 400-700-Mc Rf Tuner, Tuning Unit 4
• Alignment of 400-700-Mc Rf Tuner, Tuning Unit 4 (cont)
• Alignment of 400-700-Mc Rf Tuner, Tuning Unit 4 (cont)
• Alignment of 400-700-Mc Rf Tuner, Tuning Unit 4 (cont)
• Alignment of 700-1,000-Mc Rf Tuner, Tuning Unit 4
• Alignment of 700-1,000-Mc Rf Tuner, Tuning Unit 4 (cont)
• Alignment of 700-1,000-Mc Rf Tuner, Tuning Unit 4 (cont)
• Alignment of 700-1,000-Mc Rf Tuner, Tuning Unit 4 (cont)
• Chapter 4. TROUBLESHOOTING
• Characteristics of 20-Db Variable
• Dial Calibration Accuracy
• Linearity Test
• Figure 94. Test setup for linearity check.
• Figure 95. Test setup for interference measurement.
• Impulse Noise Sensitivity
• If. Rejection
• Calibration as Two-Terminal RF Voltmeter
• Bandwidth Determination
• Power Supply Test
• Figure 96. MIL-STD resistor color-code markings.
• Figure 97. MIL-STD capacitor color-code markings.
• Appendix. REFERENCES
• INDEX
• INDEX (cont)
• INDEX (cont)
• Figure 98. Main unit, schematic diagram (part 1 of 2)
• Figure 98. Main unit, schematic diagram (part 2 of 2)
• Figure 99. Tuning unit 1, schematic diagram
• Figure 100. Tuning unit 2, schematic diagram
• Figure 101. Tuning unit 3, schematic diagram
• Figure 102. Tuning unit 4, schematic diagram
• Figure 103. Test setup for calibration as two-terminal rf voltmeter
• The Metric System and Equivalents
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• Distribution
• Distribution
• TM-11-6625-351-35
• Distribution
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• Distribution
• Recommended Changes to Equipment Technical Publications
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