13
Alignment
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
key for 1/2 second;
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
key for 1/2 second;
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.
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
key for 1/2 second;
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
key for 1/2 second;
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.
Summary of Contents for Spirit VXA-700
Page 4: ...4 Note ...
Page 5: ...5 Block Diagram ...
Page 6: ...6 Connection Diagram ...
Page 10: ...10 Note ...
Page 32: ...32 AF Unit Note ...
