Vertex Standard VXA-200 Service Manual page 10

Alignment
PLL Section
PLL Reference Frequency
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.
Press and hold in the PTT switch, MONITOR switch,
and [ ENT (
)] key while turning the transceiver on
to enter the alignment mode.
Rotate the DIAL selector knob to select "REF xxx
Press the PTT switch, confirm the frequency counter
reading is 128.000 MHz.
If not,
1. press the [ ENT (
2. rotate the DIAL selector knob clockwise (frequency
up) or counter-clockwise (frequency down),
3. press the [ ENT (
4. confirm the frequency counter reading.
Repeat above steps 1 - 4, so that the counter reading is
128.000 MHz (±100 Hz).
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 (
transceiver on.
10
REF xxx." REF xxx REF xxx REF xxx
)] key momentarily,
)] key again,
)] key while turning the
Transmitter Section
AM TX Power Adjustment
Connect the wattmeter and dummy load to the an-
tenna jack, then set the transceiver to 128.000 MHz
and turn the transceiver off.
Press and hold in the PTT switch, MONITOR switch,
and [ ENT (
)] key while turning the transceiver on
to enter the alignment mode.
Rotate the DIAL selector knob to select "TX PO xxx
Press the PTT switch with no microphone input, con-
firm the RF output power is 1.5 Watts.
If not,
1. press the [ ENT (
2. rotate the DIAL selector knob clockwise (increase
the power) or counter-clockwise (decrease the
power),
3. press the [ ENT (
4. confirm the RF output power.
Repeat above steps 1 - 4, so that the RF output power
is 1.5 Watts.
Turn the transceiver off.
TX AM Modulation Adjustment
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.
Set the transceiver to 127.500 MHz and turn the trans-
ceiver off.
Press and hold in the PTT switch, MONITOR switch,
and [ ENT (
)] key while turning the transceiver on
to enter the alignment mode.
Rotate the DIAL selector knob to select "MDLV xxx
Press the PTT switch, confirm the modulation level is
85 % modulation (±2 %).
If not,
1. press the [ ENT (
2. rotate the DIAL selector knob clockwise (increase
the MIC gain) or counter-clockwise (decrease the
MIC gain),
3. press the [ ENT (
4. confirm the modulation level.
Repeat above steps 1 - 4, so that the modulation level
is 85 % modulation (±2 %).
Turn the transceiver off.
TX PO xxx." TX PO xxx TX PO xxx TX PO xxx
)] key momentarily,
)] key again,
MDLV xxx MDLV xxx
MDLV xxx." MDLV xxx
)] key momentarily,
)] key again,