8
4. Base unit :
4.1 Test Equipment required and connection.
AC Power supply : 120V 50Hz
4.2. Preparation from alignment
Place the Base Board into test mode.
4.3. Alignment procedure :
Step
Preset
Adjustment
Remark
1
Base Board into test
mode
---
Connect the digital voltmeter to the point RX-
Loop -V. The reading should >0.25V DC and
<4.3V DC.
2
Base Board into test
mode
---
Connect the digital voltmeter to test point TX-
Loop -V. The reading should > 0.25V DC and
<4.3 DC.
3
Base Board into test
mode
BRC99
Connect the digital voltmeter to test point RX
AUDIO. Adjust for1.625VDC to 1.925VDC at
CH6.
4
Base Board into test
mode
BC56
Connect the Frequency counter to test point ANT.
Adjust for 903.8MHz at CH6.
5
Audio Gen : 1KHz,
-10dB (NO Load)
BR40
Connect the VTVM to test point PIN 4 &5 of BT1
Adjust for -10dB
6
Audio Gen : 1KHz,
-30dB (NO Load)
BR39
Connect the VTVM to test point TX Audio. Adjust
for -26dB.
Digital Voltmeter
RX -Loop-V TX-Loop-V RX-Audio
Quad-Tune /
Base unit
Pin4 &5 of BT1/
Pin3 of BT1
(RF & Audio Board)
Tx Audio
9V DC IN ANT
Audio
Generator
VTVM
Adapter
Frequency
Counter
Содержание FT-3809 BK
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