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Vertex Standard VX-424A Series Service Manual page 10

Vhf fm transceiver
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Alignment
Set up the test equipment as shown below for trans-
ceiver alignment, and apply 7.5V DC power to the trans-
ceiver.
Power Supply
7.5 VDC
Transceiver
ANT
RF IN/OUT
Radio
Tester
CLONE
GND
MIC IN
SP
MIC IN
CLONE
The transceiver must be programmed for use in the
intended system before alignment is attempted. The RF
parameters are loaded from the file during the alignment
process.
In order to facilitate alignment over the complete op-
erating rang of the equipment, it is recommended that the
channel data in the transceiver be preset as per the chart
below.
C
C
S
HANNEL
HANNEL
PACE
CH 1
Wide
CH 2
Narrow
CH 3
Wide
CH 4
Wide
10
Adapter
MIC/SP
MIC
SP CLONE
AF OUT
AF IN
COM Port
10µF/16V
AF IN
2.2 kΩ
PTT
SP
AF OUT
4 Ω
CT-29
( S
)
F
REQUENCY
IMPLEX
160.100 MHz
160.100 MHz
146.100 MHz
173.900 MHz
PLL VCV (Varactor Control Voltage)
Connect the DC voltmeter between TP2045 on the
Main Unit and ground.
Set the transceiver to CH 4 (high band edge), and ad-
just L2036 on the Main Unit for 4.0 V ± 0.1 V on the
DC voltmeter.
Set the transceiver to CH 3 (low band edge), and con-
firm the low-end VCV is more than 0.9 V while re-
ceiving.
Set the transceiver to CH 4 (high band edge), and ad-
just L2038 on the Main Unit for 4.0 V ± 0.1 V while
transmitting.
Set the transceiver to CH 3 (low band edge), and con-
firm the low-end VCV is more than 0.9 V while trans-
mitting.
Side B
Side A
TP2045
L2036
L2038

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