Comnet MLS II MLSH041, Maintenance Manual

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ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A
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5.3 RECEIVER
Alignment and Troubleshooting procedures for Receiver Circuitry on
Transmitter/Receiver Board CMN-233 are as follows:
5.3.1 Receiver Alignment
Equipment Required:
•
RF Signal Generator (150.8 – 174 MHz)
•
DC Voltmeter
•
Frequency Counter (up to 500 MHz with 0.05 V sensitivity)
•
Audio Level Meter and Distortion Analyzer
•
4 Ohm, 6 Watt Resistor
5.3.1.1
Preliminary Adjustment
1. Connect 13.8 VDC to P2.
2. Set MONITOR switch to “out” position.
3. Select desired channel.
4. Disable Channel Guard by connecting ground to J701-7.
5. Connect RF Signal Generator to antenna jack J1.
NOTE
Make sure the transmitter is properly aligned before aligning the receiver
.