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Preface7
Table of Contents9
General24
Section 1 - Introduction24
FM/AM-SOOA Electrical Description24
Frequency Selectors24
Meters24
Mode/Bandwidth Control24
RF Output Level Control25
FM/AM-SOOA Power Requirements25
Frequency Standards25
Reference Designators25
Corrective Maintenance Procedures26
Section 2 - Theory of Operation29
Introduction29
Simplified Theory of Operation29
Intermodule Systems Theory of Operation29
Block Modules30
Simplified Theory of Operation30
Operation as a Receiver30
Intermodule Systems Theory of Operations33
Reference Frequencies33
Frequency Conversion Modules33
Reference Frequencies Block Diagram33
Audio System34
Frequency Conversion Modules Block Diagram35
Frequency Error Display36
Audio System Block Diagram37
Frequency Error Indicator Block Diagram38
Phase Lock Indicator Circuit39
Phase Lock Indicator Circuit Block Diagram39
Section 3 - Performance Evaluation40
General40
Test Equipment Requirements41
Mobile Performance Evaluation Procedures42
Khz Tone Generator43
Variable Tone Generator44
Receiver45
RF Frequency Error Meter47
Audio Frequency Error Meter49
Generate Mode and Modulation Meter51
Modulation Meter51
Ssb53
Variable Tone Generator Lab Test Set-Up56
Receiver Lab Test Set-Up58
Frequency Error Meter Lab Test Set-Up66
Modulation Meter Lab Test Set-Up68
SINAD Meter71
Power Meter 4 -275
Generate Output Level75
General75
Calibration Points77
How to Use Tabular Flowcharts100
Troubleshooting Hints100
Safety Precautions101
Test Equipment Requirements101
Disassembly/Reassembly Requirements102
Index of Troubleshooting Flowcharts102
Troubleshooting Power Supply103
Incorrect Output Voltages103
Incorrect Battery Charging Rate106
Troubleshooting Receiver108
Sensitivity Low at Certain Frequencies108
Sensitivity Low at All Frequencies109
Improper Demodulation111
Troubleshooting Generator114
Incorrect Carrier Amplitude114
Incorrect Carrier Frequency121
Inadequate Response to Variable Generator Control124
Tr O U B 1 es Ho O T I N G Phase lo C K S· y Stem126
Lock Light Indicates System Is Not Phase Locked126
High Loop Does Not Phase Lock130
Low Loop Does Not Phase Lock134
Section 8 - Disassembly/Reassembly Procedures137
6- I Disassembly/Reassembly Procedures137
Genera 1137
Preliminary Considerations137
Index of Module Disassembly and Reassembly Procedures138
Case138
Battery138
Oven Oscillator138
Frequency Standard PC Boa Rd141
Power Supply PC Board141
1120 Mhz Low Pass Filter142
Speaker142
Motherboard142
Audio PC Boards143
Enclosed Module Assemblies144
Enclosed Modules145
IF Module Assembly150
IF Module151
Dual VCO153
Rear Panel154
Attenuator Control Alignment164
Power Supply Block Diagram171
Reassembly174
Preparation for Testing177
Testing178
Dual VCO Block Diagram180
Dual VCO Test Connections183
High Loop Synthesizer Block Diagram187
Low Loop Synthesizer Test Set-Up198
Receiver/Generator Block Diagram201
Frequency Standard Block Diagram207
Digital Module Input Signals215
Audio 300217
Reassembly218
Receive Audio Module Block Diagram221
Generate Audio Module Block Diagram230
Output Amplifier Module Block Diagram237
Generate Amplifier Block Diagram247
Section 8 - Preventive Maintenance249
External Cleaning249
Internal Cleaning249
Visual Inspection249
Section 9 - Pc Board Assemblies251
General251
Modulation Meter Switch PC Board (FM/AM-500A)251
RF Thumbwheel Switch PC Board252
Variable Tone Thumbwheel Switch PC Board252
Power Supply PC Board252
(SN 1001 Thru 3224)273

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IFR FM/AM-500A Specifications

General

Brand	IFR
Model	FM/AM-500A
Category	Measuring Instruments
Language	English

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IFR FM/AM-500A Service Manual

Table of Contents

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IFR FM/AM-500A Specifications

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