Vertex Standard VXA-700 Service Manual page 13

FM TX HI Power Adjustment
r Connect the wattmeter and dummy load to the an-
tenna jack, then set the transceiver to 146.000 MHz
and turn the transceiver off.
r Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
r Rotate the DIAL selector knob to select "FM TX Hi xxx."
r Press the PTT switch, and confirm that the RF output
power is 5 Watts.
r If not:
1. Press the key momentarily;
2. Rotate the DIAL selector knob clockwise (increases the
power) or counter-clockwise (decreases the power);
3. Press and hold the
4. Confirm the RF output power.
r Repeat steps 1 - 4, as necessary, until you achieve the
specified RF output power of 5 Watts.
r Turn the transceiver off.
FM TX LOW1 Power Adjustment
r Connect the wattmeter and dummy load to the an-
tenna jack, then set the transceiver to 146.000 MHz
and turn the transceiver off.
r Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
r Rotate the DIAL selector knob to select "FM TX L1 xxx."
r Press the PTT switch, and confirm that the RF output
power is 0.3 Watts.
r If not:
1. Press the key momentarily;
2. Rotate the DIAL selector knob clockwise (increases the
power) or counter-clockwise (decreases the power);
3. Press and hold the
4. Confirm the RF output power.
r Repeat steps 1 - 4, as necessary, until you achieve the
specified RF output power of 0.3 Watts.
r Repeat the above procedures for the "FM TX L2 xxx
(set to 1 Watt)" and "FM TX L3 xxx (set to 2.5 Watt)"
parameters.
r Turn the transceiver off.
key for 1/2 second;
key for 1/2 second;
Tx AM Modulation (Hi) Adjustment
r 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.
r Set the transceiver to 127.500 MHz and turn the trans-
ceiver off.
r Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
r Rotate the DIAL selector knob to select "AM MOD Hi
xxx."
r Press the PTT switch, and confirm that the modula-
tion level is 85 % modulation (±5 %).
r If not:
1. Press the key momentarily;
2. Rotate the DIAL selector knob clockwise (increases the
MIC gain) or counter-clockwise (decreases the MIC
gain);
3. Press and hold the
4. Confirm the modulation level.
r Repeat steps 1 - 4, as necessary, until you achieve the
specified 85 % modulation level (±5 %).
r Turn the transceiver off.
Tx AM Modulation (Low) Adjustment
r 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.
r Set the transceiver to 127.500 MHz and turn the trans-
ceiver off.
r Reduce the power supply voltage to 4.8 V.
r Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
r Rotate the DIAL selector knob to select "AM MOD Lo
xxx."
r Press the PTT switch, and confirm that the modula-
tion level is 85 % modulation (±5 %).
r If not:
1. Press the key momentarily;
2. Rotate the DIAL selector knob clockwise (increases the
MIC gain) or
counter-clockwise (decreases the MIC gain);
3. Press and hold the
4. Confirm the modulation level.
r Repeat steps 1 - 4, as necessary, until you achieve the
specified 85 % modulation level (±5 %).
r Return the power supply voltage to 7.4 V.
r Turn the transceiver off.
Alignment
key for 1/2 second;
key for 1/2 second;
13