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Transmitter Section
Item
Condition
1. Maximum
1) NXDN Narrow
Deviation
(NXDN)
2) NXDN Very Narrow
2. Driver
Disconnect the cable from TX
Amplifi er
OUT and insert a cable from
Power
power meter.
After the adjustment, connect
the cable to TX OUT.
1) Low
2) Center
3) High
3. High
Frequency
Transmit
1) Low
Power
2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
4. Low
Frequency
Transmit
1) Low
Power
2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
5. Deviation
Modulation Pattern
(NXDN Very
: 100Hz Square Signal
Narrow)
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
(NXDN
Exit "Deviation" screen to "Test
Narrow)
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.
ADJUSTMENT
Measurement
Test-
Unit
Terminal
Unit
equipment
Power meter TX
TX
OUT
(CN802)
Power meter Rear
TX ANT
Deviation
Rear
TX ANT
meter
Oscilloscope
PC
NXR-901
Adjustment
Parts
Method
PC
Value: 22800
Fixed value writing
ADJ
Value: 10000
PC
+16dBm (40mW)
±0.1dB
ADJ
Disconnect the cable from TX
OUT and insert a cable from
power meter.
After the adjustment, connect
the cable to TX OUT.
PC
360mW
±5mW
ADJ
100mW
±5mW
PC
±1.10kHz
±0.05kHz
ADJ
Adjust it into clean
square wave with
Connect the deviation meter
changing "Sub-
to the TX ANT end via the
audible Gain" and
ATT.
"Audible Gain".
Check
±3.06kHz±0.20kHz
Clean sine wave.
Specifi cations / Remarks
83
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