Kenwood NXR-800 Service Manual page 38

NXR-800
Item Condition
15. High 1) Low
Transmit
Power
(Pre ADJ)
16. Coupler 1) Low
ADJ
17. High 1) High
Transmit
Power
(Max power
limit ADJ)
18. High Frequency
Transmit 1) Low
Power 2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
19. Low Frequency
Transmit 1) Low
Power 2) Center
3) High
Attach the EXCITER/FINAL
shield cover.
20. Deviation Modulation pattern
: 100Hz square signal
(The transmis- Connect the deviation meter to
sion VCO band the TX ANT end via the ATT.
is separated Deviation meter setting
into A and B. HPF: OFF
3-points for LPF: 15kHz
each, i.e., total De-emp: OFF
of 6-points shall Detector: (p-p)/2
be adjusted.) 1) A: Low
2) A: Center
3) A: High
4) B: Low
5) B: Center
6) B: High
Exit "Deviation" screen to "Test
Mode" screen, then set test
signaling mode to be "NXDN"
and signaling number to be "3".
Set Wide/Narrow drop down
list to be "Narrow". Set test
channel to be "1".
Deviation meter setting
HPF: OFF
LPF: 15kHz
De-emp: OFF
Detector: +peak, –peak
Push "Transmit" button, then
measure the deviation.
38
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Power meter Rear TX ANT
PC
Final
DVM Final REF Final
Power meter Rear TX ANT
PC
Final
Power meter Rear TX ANT
Ammeter
Deviation Rear TX ANT
meter
Oscilloscope
PC
Adjustment
Parts Method
PC Value: 1024 Fixed value writing
ADJ
VR2 5.0W ±0.1W
VR1 Adjust to the mini-
mum value.
PC Value: 1024 Fixed value writing
ADJ
VR2 7.0W ±0.2W
PC 5.0W ±0.1W
ADJ 4.4A or less
0.50W ±0.01W
3.3A or less
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