Service manual

15
Alignment
Alignment Point
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 MAIN 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 VR1003 to obtain 1.5 W RF (car-
rier) power indicated on the wattmeter (without au-
dio modulation input).
TX Modulation Adjustment
r Connect the Radio Tester to the antenna jack, then ad-
just 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 % modula-
tion (±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
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 CHANNEL selector knob. Trans-
ceiver 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)
r Press the CHANNEL selector knob, then select the
squelch hysteresis level using the CHANNEL selector
knob.
r Next, press the CHANNEL 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 CHANNEL selector knob twice.
r Now rotate the CHANNEL 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 CHANNEL selector knob twice.
r Press and hold the in the CHANNEL 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 fac-
tory defaults), press and holding the MONITOR button and
PTT switch while turning the transceiver on.
TC1001
PLL Reference
VR1003
TX Power Adjustment
VR1002
TX Modulation Adjustment
VR1001
TX Modulation Adjustment
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