Squelch Threshold; Manual Alignment - Vertex VXR-1000 Service Manual

Ë
With the transceiver set to (band center) chan-
nel #3, and the RF signal generator tuned to
the same frequency, set the generator for 3.0
kHz deviation (for 25 kHz steps) with 1 kHz
tone modulation, and set the output level for
100 µV at the antenna jack.
Ë
Adjust T2002, T2003, T2004, and T2005 on the
Main Unit for optimum SINAD, reducing the
signal generator output level as necessary for
proper meter deflection.
Ë
After the previous step, the final signal gen-
erator level should be less than 0.3 µV for 12
dB SINAD.
Squelch Threshold I
PC Alignment
Ë
Select channel #3, and adjust the signal gen-
erator level for 0 dBµ (1.0 µV).
Ë
Adjust the squelch threshold level by the PC
so that it just closes (RX LED turns off).

Manual Alignment

Ë
Turn the VXR-1000 off.
Ë
Rotate the CHANNEL Selector Knob to the "16"
position.
Ë
Press and hold in the PTT switch while you
turn the VXR-1000 on, then rotate the CHAN-
NEL Selector Knob counter-clockwise to the
"13" position while holding in the PTT switch
continuously.
Ë
Confirm that the "PRI," "COR," and "PWR"
LEDs are blinking, then release the PTT
switch. The VXR-1000 now is in the Squelch
Threshold Alignment Mode.
Ë
Rotate the CHANNEL Selector Knob to the "2"
position, and adjust the Signal Generator level
for 0 dBµ (1.0 µV).
Ë
Press and hold in the PTT switch, and rotate
the CHANNEL Selector Knob so that the "RX"
LED turns off (Squelch just closes).
Ë
Release the PTT switch, then turn the VXR-
1000 off.
Squelch Threshold II
You can now adjust the Squelch Threshold
for each channel.
Ë
Turn the VXR-1000 off.
Ë
Rotate the CHANNEL Selector Knob to the "16"
position.
Ë
Press and hold in the PTT switch while you
turn the VXR-1000 on, then rotate the CHAN-
NEL Selector Knob counter-clockwise to the
"14" position while holding in the PTT switch
continuously.
Ë
Confirm the "MBL," "COR," and "PWR" LEDs
are blinking, then release the PTT switch. The
VXR-1000 now is in the Squelch Threshold
Alignment (for each channel) Mode.
Ë
Rotate the CHANNEL Selector Knob to the
channel position where you wish adjust the
squelch threshold level.
Ë
Press and hold in the PTT switch, and rotate
the CHANNEL Selector Knob so that the "RX"
LED turns off (Squelch just closes).
Ë
Release the PTT switch, then turn the VXR-
1000 off.
Alignment
31