Kenwood NXR-700 Service Manual page 53

Item Condition
10. Receive 1) A: Low
VCO Lock
Voltage
2) A: High
(Adjustment
& Check)
3) B: Low
4) B: High
11. Reference 1) Connecting SSG to REF IN
Signal and 50Ω-load parallel.
SSG frequency: 10MHz
The switch- SSG output: +0dBm (224mV)
ing circuit to
2) SSG frequency: 10MHz
switch the
SSG output: +0dBm (224mV)
OCXO and the
internal refer-
3) SSG frequency: 10MHz
ence oscilla-
SSG output: +10dBm (708mV)
tion
4) SSG frequency: 10MHz
SSG output: –7dBm (99.9mV)
12. VCXO 1) Confi rm that there is no
OCXO and external reference
input.
13. Maximum 1) NXDN Narrow
Deviation
(NXDN) 2) NXDN Very Narrow
14. 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
15. High 1) Low K
Transmit Center K2
Power
(Pre ADJ)
16. Coupler 1) Low K
ADJ Center K2
17. High 1) High
Transmit
Power
(Max power
limit ADJ)
2) Low
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
DVM RX CV1
PC
SSG Rear REF IN TX
Spectrum TX REF OUT
analyzer
SSG Rear REF IN
Oscilloscope TX REV_LV
SSG Rear REF IN
Spectrum TX REF OUT
analyzer
F. counter TX REF_IN
PC
Power meter TX TX OUT
(CN802)
Power meter Rear TX ANT
PC
Final
DVM Final REF Final
Power meter
Power meter Rear TX ANT
PC
Final
NXR-700
Adjustment
Parts Method
PC 0.8V K ±0.05V
ADJ 0.9V K2
Check 4.0V or less K
4.2V or less K2
PC 0.8V K ±0.05V
ADJ 0.9V K2
Check 4.0V or less K
4.2V or less K2
VR402 +8~+9dBm The OCXO LED (orange)
lights.
VR401 2.0Vp-p The OCXO LED (green) lights.
Check REF OUT: +10dBm or less
The OCXO LED (orange)
lights.
REF OUT: –50dBm or less
The OCXO LED goes off.
PC 5.99MHz+0.3ppm ±0.15ppm
ADJ (5.99000270~5.99000090MHz)
It takes a time from move-
ment of adjustment value to
stability.
PC Value: 22800 Fixed value writing
ADJ
Value: 10000
PC +20.0dBm (100mW) ±0.1dBm
ADJ
Disconnect the cable from TX
OUT and insert a cable from
power meter.
After the adjustment, connect
the cable to TX OUT.
PC Value: 1024 Fixed value writing
ADJ
VR2 5.0W ±0.1W
VR1 0.09~0.14V K Adjust to the minimum value,
if it is not reduced to 0.14V. K
Adjust to the mini-
mum value. K2
PC Value: 1024 Fixed value writing
ADJ
VR2 7.0W ±0.2W
PC Value: 1024 Fixed value writing
ADJ
Check 6.5W or more
Specifi cations / Remarks
53