Vertex Standard VXA-210 Service Manual page 15

Internal System Alignment Routine
This feature uses a programmed routine in the trans-
ceiver which replaces many previously-complex discrete
component settings and adjustments with digitally-con-
trolled settings via the DIAL selector knob. Transceiver
adjustments include:
¦ Squelch Hysteresis Adjustment
¦ Squelch Threshold Adjustment
¦ Squelch "Tight" Adjustment
¦ VOR Sensitivity Adjustment
¦ VOR Sensitivity Hysteresis 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 DIAL selector knob while
turning the transceiver on.
Squelch Hysteresis Adjustment
r Press the DIAL selector knob, then select the squelch
hysteresis level using the DIAL selector knob.
r Next, press the DIAL selector knob.
r Rotate the CHANNEL selector knob to select the next
setting.
Squelch Threshold Adjustment (THSQ)
r Inject a –9 dBµ (0.35 µV) RF signal (with a standard
modulation: 30 % AM modulation @ 1 kHz), then press
the DIAL selector knob twice.
r Now rotate the DIAL selector knob to select the next
setting.
Squelch "Tight" Adjustment (TISQ)
r Increase the RF signal level to +15 dBµ (5.6 µV), then
press the DIAL selector knob twice.
r Now rotate the DIAL selector knob to select the next
setting.
VOR Sensitivity Adjustment (VSTR)
r Increase the RF signal level to +8 dBµ (2.5 µV), then
press the DIAL selector knob twice.
r Now rotate the DIAL selector knob to select the next
setting.
VOR Sensitivity Hysteresis Adjustment (HSVS)
r Press the DIAL selector knob, then select the VOR
Sensitivity Hysteresis level using the DIAL selector
knob.
r Press and hold the in the DIAL selector knob for 2
second to save all setting and exit.
Resetting the CPU
If you are unable to gain control of the transceiver
(or if you want to clear all memories and settings to
their factory defaults), press and holding the MON-
ITOR switch and PTT switch while turning the
transceiver on.
Alignment
15