NXR-901
83
ADJUSTMENT
Transmitter Section
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1. Maximum
Deviation
(NXDN)
1) NXDN Narrow
PC
ADJ
Value: 22800
Fixed value writing
2) NXDN Very Narrow
Value: 10000
2. Driver
Amplifi er
Power
Disconnect the cable from TX
OUT and insert a cable from
power meter.
After the adjustment, connect
the cable to TX OUT.
1) Low
2) Center
3) High
Power meter TX
TX
OUT
(CN802)
PC
ADJ
+16dBm (40mW)
±0.1dB
Disconnect the cable from TX
OUT and insert a cable from
power meter.
After the adjustment, connect
the cable to TX OUT.
3. High
Transmit
Power
Frequency
1) Low
2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
Power meter Rear
TX ANT
PC
ADJ
360mW
±5mW
4. Low
Transmit
Power
Frequency
1) Low
2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
100mW
±5mW
5. Deviation
(NXDN Very
Narrow)
Modulation Pattern
: 100Hz Square Signal
Connect the deviation meter to
the TX ANT end via the ATT.
Deviation meter setting
HPF: OFF
LPF: 15kHz
De-emp: OFF
Detector: (p-p)/2
1) Low
2) Center
3) High
Deviation
meter
Oscilloscope
PC
Rear
TX ANT
PC
ADJ
±1.10kHz
Adjust it into clean
square wave with
changing “Sub-
audible Gain” and
“Audible Gain”.
±0.05kHz
Connect the deviation meter
to the TX ANT end via the
ATT.
(NXDN
Narrow)
Exit “Deviation” screen to “Test
Mode” screen, then set test
signaling mode to be “NXDN”
and signaling number to be “3”.
Set Narrow/Very Narrow drop
down list to be “Narrow”. Set
test channel to be “1”.
Modulation Pattern
: Maximum Deviation Pattern
Deviation meter setting
HPF: OFF
LPF: 15kHz
De-emp: OFF
Detector: +peak, –peak
1) Low
Push “Transmit” button, then
measure the deviation.
Check
±3.06kHz±0.20kHz
Clean sine wave.
Summary of Contents for NEXEDGE NXR-901
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