Vertex Standard VXA-200, Service Manual

Page: 10 / 28

10
Alignment
PLL Section
PLL Reference Frequency
ˆ
Connect the wattmeter, dummy load and frequency
counter to the antenna jack, then set the transceiver to
128.000 MHz and turn the transceiver off.
ˆ
Press and hold in the
PTT
switch,
MONITOR
switch,
and [
ENT
( )] key while turning the transceiver on
to enter the alignment mode.
ˆ
Rotate the
DIAL
selector knob to select “
REF xxx REF xxx REF xxx REF xxx REF xxx
.”
ˆ
Press the
PTT
switch, confirm the frequency counter
reading is 128.000 MHz.
ˆ
If not,
1. press the [
ENT
( )] key momentarily,
2. rotate the
DIAL
selector knob clockwise (frequency
up) or counter-clockwise (frequency down),
3. press the [
ENT
( )] key again,
4. confirm the frequency counter reading.
ˆ
Repeat above steps 1 - 4, so that the counter reading is
128.000 MHz (±100 Hz).
ˆ
Turn the transceiver off.
Transmitter Section
AM TX Power Adjustment
ˆ
Connect the wattmeter and dummy load to the an-
tenna jack, then set the transceiver to 128.000 MHz
and turn the transceiver off.
ˆ
Press and hold in the
PTT
switch,
MONITOR
switch,
and [
ENT
( )] key while turning the transceiver on
to enter the alignment mode.
ˆ
Rotate the
DIAL
selector knob to select “
TX PO xxx TX PO xxx TX PO xxx TX PO xxx TX PO xxx
.”
ˆ
Press the
PTT
switch with no microphone input, con-
firm the RF output power is 1.5 Watts.
ˆ
If not,
1. press the [
ENT
( )] key momentarily,
2. rotate the
DIAL
selector knob clockwise (increase
the power) or counter-clockwise (decrease the
power),
3. press the [
ENT
( )] key again,
4. confirm the RF output power.
ˆ
Repeat above steps 1 - 4, so that the RF output power
is 1.5 Watts.
ˆ
Turn the transceiver off.
TX AM Modulation Adjustment
ˆ
Connect the Radio Tester to the antenna jack, then
adjust the AF generator output level for injection of
200 mV rms @ 1 kHz to the MIC jack.
ˆ
Set the transceiver to 127.500 MHz and turn the trans-
ceiver off.
ˆ
Press and hold in the
PTT
switch,
MONITOR
switch,
and [
ENT
( )] key while turning the transceiver on
to enter the alignment mode.
ˆ
Rotate the
DIAL
selector knob to select “
MDLV xxx MDLV xxx MDLV xxx MDLV xxx MDLV xxx
.”
ˆ
Press the
PTT
switch, confirm the modulation level is
85 % modulation (±2 %).
ˆ
If not,
1. press the [
ENT ( )] key momentarily,
2. rotate the
DIAL
selector knob clockwise (increase
the MIC gain) or counter-clockwise (decrease the
MIC gain),
3. press the [
ENT
( )] key again,
4. confirm the modulation level.
ˆ
Repeat above steps 1 - 4, so that the modulation level
is 85 % modulation (±2 %).
ˆ
Turn the transceiver off.
Resetting the CPU
If you are unable to gain control of the transceiver
(or if you want to clear all memories and settings
to their factory defaults), press and hold the
MONI-
TOR
switch and [
ENT
( )] key while turning the
transceiver on.