Adjustment Procedure - Cobra MR HH325VP Service Manual

Step Adjustment
1 L22 Receive
2 L23 Transmit
3 VC1
VR2
4
Modulation

ADJUSTMENT PROCEDURE

Test Point Procedure
1. Connect digital voltmeter to TP1 on RF PCB.
2. Set CH01.
TP1
3. Adjust L22.
4. TP1 voltage 1.2~1.6V DC.
1. Connect a digital voltmeter to TP1 on RF PCB.
2. Set CH01.
TP1
3. Adjust L23.
4. TP1 voltage 1.2~1.6V DC.
1. Connect the antenna coupler output to a frequency counter.
2. Set channel to CH01 (156.050 MHz).
3. Adjust VC1 to obtain a frequency reading 156.050 MHz±200Hz.
1. Connect the antenna coupler output to an FM linear detector.
2. Connect Audio Oscillators to Microphone Jack.
3. Set unit to transmit mode.
4. Set audio oscillator output to -23dBm 1 kHz.
5. Adjust VR2 to obtain ±4.5 kHz deviations.
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