31VXR-7000 UHF Service Manual
Alignment
Repeater Mode
Deviation Adjustment
First ensure that the “DUPLEX” mode of operation
is enabled via CE27 Channel/Alignment Program.
Set the BASE/REPEATER switch on the front panel
of the repeater to the “REPEATER” mode (the RE-
PEATER LED will turn on).
Inject a signal on the Center channel frequency at a
level of 40 dBμ (1 kHz tone @ ±3 kHz deviation)
from the RF Signal Generator into the RX antenna
jack, and adjust VR4001 (on the CNTL Unit) so that
the deviation meter reading (TX deviation) is ±3.0
kHz (±0.1 kHz) deviation.
Base Mode
Alignment Setup
Set the BASE switch on the front panel of the re-
peater to the “BASE” mode (the REPEATER LED
will turn off).
Press the LOCAL/REMOTE switch on the front pan-
el of the repeater to the “REMOTE” mode (the RE-
MOTE LED will turn on).
Set S4001 and S4002 on the CNTL Unit to the “0
(off)” position and “1 (on)” position respectively, then
select the Center channel.
Audio Level Adjustment (LINE OUT Level)
Inject a signal on the Center channel frequency at a
level of -73 dBm (1 kHz tone @ ±3.0 kHz deviation)
from the RF Signal Generator into the RX antenna
jack, and adjust VR4002 (on the CNTL Unit) so that
the “Line Out” audio level (LINE jack pins 5 and 6)
is –10 dBm (±0.1 dBm).
Deviation Adjustment (LINE IN Level)
Connect the AF generator to LINE jack pins 3 and 4,
and the AF generator output level to -10 dBm, at a
frequency of 1 kHz.
Key the repeater, and adjust VR4003 (on the CNTL
Unit) so that the deviation meter reading (TX devia-
tion) is 3.0 kHz (±0.1 kHz) deviation.
CNTL Unit Alignment Points
VR4003
VR4002
S4002
VR4001
S4001
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