User's Guide

Audio Processor Board Instruction Manual iii
TABLE OF CONTENTS
Page
1 FM AUDIO PROCESSOR .............................................................................................1-1
1.1 Introduction ..........................................................................................................1-1
1.2 Block Diagram (FM Audio Processor).................................................................1-3
1.3 FM Audio Processor Board Pin Connections.......................................................1-4
1.4 Factory Configuration...........................................................................................1-4
1.5 Turn-on Time........................................................................................................1-5
1.6 Low Frequency Modulation..................................................................................1-5
1.7 Transmitter Standby Modes..................................................................................1-5
2 SIGNALS.........................................................................................................................2-1
2.1 FM Audio Processor Outputs...............................................................................2-1
2.2 Modulation Output ...............................................................................................2-1
2.3 Low Frequency / Direct Mod. Output...................................................................2-1
2.4 Microphone Input.................................................................................................2-1
2.5 Balanced Input......................................................................................................2-1
2.6 Auxiliary Input......................................................................................................2-2
2.7 Subtone Inputs......................................................................................................2-2
2.8 Direct Modulation Input .......................................................................................2-2
3 THEOR Y OF OPERATION ............................................................................................3-1
4 ALIGNMENT..................................................................................................................4-1
4.1 Standard Deviation Adjustment.............................................................................4-1
4.2 Balanced Input Setup............................................................................................4-1
4.3 Microphone Input Setup.......................................................................................4-1
4.4 Subtone Input Setup .............................................................................................4-2
4.5 Balanced Input Frequency Response....................................................................4-2
5 TROUBLESHOOTING - TEST EQUIPMENT NEEDED ............................................5-1
5.1 Balanced Input Test ..............................................................................................5-1
5.2 Frequency Response Test.....................................................................................5-1
5.3 Subtone Input Test................................................................................................5-2
5.4 Audio benchmarks ................................................................................................5-2
6 TEMPERATURE COMPENSATION ............................................................................6-1
7 ILLUSTRATIONS, TABLES AND SCHEMATIC DIAGRAMS ..................................7-1
7.1 Special Jumper Configuration Table.....................................................................7-1
7.2 FM Audio Processor Component Layout.............................................................7-2
7.3 FM Audio Processor Schematic Diagram.............................................................7-3
8 FM AUDIO PROCESSOR PARTS LIST.......................................................................8-1
9 AM AUDIO PROCESSOR.............................................................................................9-5
9.1 Introduction ..........................................................................................................9-5
9.2 Performance Specifications...................................................................................9-5
9.3 Audio Specifications.............................................................................................9-6