Vertex Standard VXA-710 SPIRIT, Service Manual

Page: 12 / 40

12
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; now turn the transceiver off.
Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
Rotate the DIAL selector knob to select “
RX TUNE xxx
.”
Press the
PTT
switch, and confirm that the counter
reading is 128.000.00 MHz.
If not:
1. Press the key momentarily;
2. Rotate the
DIAL
selector knob clockwise (frequency
up) or counter-clockwise (frequency down);
3. Press and hold the key for 1/2 second;
4. Confirm the counter reading.
Repeat above steps 1 - 4, so that the counter reading is
128.000.00 MHz (±100 Hz).
Turn the transceiver off.
Transmitter Section
AM TX HI 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 key while turning the transceiver on to enter
the alignment mode.
Rotate the DIAL selector knob to select “
AM TX Hi xxx
.”
Press the
PTT
switch with no microphone input, and
confirm that the RF output power is 1.5 Watts.
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 key for 1/2 second;
4. Confirm the RF output power.
Repeat steps 1 - 4, as necessary, until you achieve the
specified RF output power of 1.5 Watts.
Turn the transceiver off, then back on again, to pro-
ceed to the next step.
AM TX LOW 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.
Reduce the power supply voltage to 4.8 V.
Press and hold in the PTT switch, MONITOR switch,
and key while turning the transceiver on to enter
the alignment mode.
Rotate the DIAL selector knob to select “
AM TX Lo xxx
.”
Press the PTT switch with no microphone input, and
confirm that the RF output power is 0.3 Watts.
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 key for 1/2 second;
4. Confirm the RF output power.
Repeat steps 1 - 4, as necessary, until you achieve the
specified RF output power of 0.3 Watts.
Return the power supply voltage to 7.4 V.
Turn the transceiver off.
NOTICE !
Do not touch the “
FM TX Hi xxx
,” “
FM TX L3 xxx
,”
“
FM TX L2 xxx
,” and “
FM TX L1 xxx
” parameters.