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Starting the Program Under DOS - Running Under Windows
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The DETECT Screen - Data Error Display
Section V - CIRCUIT DESCRIPTIONS
Introduction .............................................................................................................................15
Navigating the Schematics - The “PIC” and Front-Panel Logic
Input Conditioning and First Two Conversions ..................................................................15
Input Stage and Band-Pass Filter - Programmable First LO -
First IF and Second LO
Second IF and SCA Demodulation .......................................................................................16
Second IF Filter - SCA Demodulator - De-Emphasis, Audio
Output and Monitoring
Third(!) Conversion ................................................................................................................17
LO and Mixer - IF Filtering
Metering ...................................................................................................................................17
Metering Selector - Meter Rectifier - Bargraph Display
RDS Option Plug-In Assembly ..............................................................................................18
Baud Rate Jumper
Power Supply ...........................................................................................................................18
Model 540 Calibration Procedures .......................................................................................19
R14: Input Gain and Flatness Check - R19 and R64: Injection
and Data Level Set - R20: SCA Deviation - R21: SCA Audio
Level Set
Section VI - APPENDIX
Parts Lists - Schematics - Warranty .................................................................................21
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