14
PLL Reference Frequency
r
Connect the wattmeter, dummy load and frequency
counter connected to the antenna jack, and tune the
transceiver to 120.000 MHz.
r
Transmit, and adjust
TC1001
on the RF Unit, if nec-
essary, so the counter frequency is 120.000 MHz (±100
Hz).
TX Power Adjustment
r
Connect the wattmeter and dummy load to the anten-
na jack, and tune the transceiver to 128.000 MHz.
r
Transmit, and adjust
VR1004
to obtain 1.5 W RF (car-
rier) power indicated on the wattmeter (without audio
modulation input).
TX Modulation 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. Leave the trans-
ceiver tuned to 127.500 MHz.
r
Transmit, and adjust
VR1002
to obtain 85 % modula-
tion (±5 %) as indicated on the Radio Tester.
r
Reduce the AF generator output level to 20 mV rms,
then adjust
VR1001
to obtain 30 % modulation (±3
%) on the Radio Tester.
VOR Phase Adjustment
r
Set the transceiver to 108.000 MHz, set up the “
FROM
”
mode (press [
F
] + [
3
(
FROM
)] key, if necessary), and
set the Avionics Radio Tester as shown below.
r
Adjust
VR1003
for 90° (±1°) on the transceiver dis-
play.
Alignment
Alignment Point
108.000 MHz
+40 dBµ
30 %
30 %
480 Hz
FROM
90°
Frequency
Output Level
30 Hz VAR.
9.96 kHz Carrier
9.96 kHz MOD
DIRECT
PHASE
TC1001
PLL Reference Frequency
VR1004
TX Power Adjustment
VR1002
TX Modulation Adjustment
VR1001
TX Modulation Adjustment
VR1003
VOR Phase Adjustment
Содержание Pilot VXA-210
Страница 10: ...10 Block Diagram ...
Страница 16: ...16 Note ...
Страница 18: ...Main Unit Note 18 ...