VXA-150
Alignment
Vertex Standard Co., Ltd.
3
TX Power Adjustment
TX Power Adjustment
TX Power Adjustment
TX Power Adjustment
R
Connect the wattmeter and dummy load to the antenna jack, and tune the
transceiver to 128.000 MHz.
R
Transmit, and adjust
VR1003
to obtain 1.5 W RF (carrier) power indicated on the
wattmeter (without audio modulation input).
TX
TX
TX
TX Modulation Adjustment
Modulation Adjustment
Modulation Adjustment
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 transceiver
tuned to 127.500 MHz.
R
Transmit, and adjust
VR1002
to obtain 85 % modulation (±3 %) 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.
Internal System Alignment Routine
Internal System Alignment Routine
Internal System Alignment Routine
Internal System Alignment Routine
This feature uses a programmed routine in the transceiver which replaces many
previously-complex discrete component settings and adjustments with digitally-
controlled settings via the
CHANNEL
selector knob. Transceiver adjustments include:
Squelch Hysteresis Adjustment
Squelch Threshold Adjustment
Squelch “Tight” Adjustment
To begin, set the transceiver to 127.500 MHz, and turn the transceiver off. Then, press
and holding the
LAMP
switch,
PTT
switch and the
CHANNEL
selector knob while
turning the transceiver on.
Squelch Hysteresis Adjustment (HSSQ)
Press the
CHANNEL
selector knob, then select the squelch hysteresis level
using the
CHANNEL
selector knob.
Next, press the
CHANNEL
selector knob.
Rotate the
CHANNEL
selector knob to select the next setting.
Squelch Threshold Adjustment (THSQ)
Inject a –9 dBµ (0.35 µV) RF signal (with a standard modulation: 30 % AM
modulation @ 1 kHz), then press the
CHANNEL
selector knob
twice
.
Now rotate the
CHANNEL
selector knob to select the next setting.
