ADJUSTMENT PROCEDURE
Step Adjustment Test Point Procedure
1 L18 Receive
*1
TP1
1. Connect digital voltmeter to TP1 on RF PCB.
2. Set CH01 .
3. Adjust L18.
4. TP1 voltage 1.2~1.6V DC.
2 L20 Transmit
*1
TP1
1. Connect a digital voltmeter to TP1 on RF PCB.
2. Set CH01 .
3. Adjust L20.
4. TP1 voltage 1.2~1.6V DC.
3 VC1
*2
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.
4
VR2
*2
Modulation
1. Connect the antenna coupler output to an FM linear detector.
2. Connect Audio Oscillator 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 deviation.
Remark:
*1: Please reference the “Main PCB Bottom View” drawing in page 12.
*2: Please reference the “Main PCB Top View” drawing in page 11.
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