VX-2500U Alignment, Page 4/4
Vertex Standard Co., Ltd.
CTCSS Modulation Level
Select band center frequency channel, with 151.4Hz CTCSS encode, and reduce the AF generator
injection to zero.
Key the transmitter and adjust by control commands for CTCSS deviation from the computer for
0.75kHz ± 0.05kHz deviation as indicated on the deviation meter.
DCS Modulation Level
Select band center frequency channel, with DCS 023 enabled, reduce the AF generator injection to
zero.
Key the transmitter and adjust by control commands for DCS deviation from the computer for 0.75kHz ±
0.05kHz deviation as indicated on the deviation meter.
Receiver
Set up the test equipment as shown for receiver alignment, and construct the audio test adapter as
described in the box below.
With the transceiver set to band center frequency channel, and the RF signal generator tuned to the
same frequency,
set the generator for ±3.0kHz deviation (for 25kHz steps) with 1kHz tone modulation,
and set the output level for 1µV at the antenna jack.
Adjust by control commands for tune from the computer for optimum SINAD, reducing signal generator
output level as necessary for proper meter deflection.
After the previous step, final signal generator level should be less than 0.25µV for 12dB SINAD.
Squelch Threshold
Select band center frequency channel, and the RF signal generator turned to the same frequency, set
the generator for ±3.0kHz deviation with 1kHz tone modulation, and set the output level for -8dBµ at the
antenna jack.
Adjust the squelch threshold level by control commands for squelch threshold from the computer so
that it just closes (
BUSY
LED turns off).
