Kenwood NXR-700H Service Manual page 116

NXR-700H
Item Condition
9. Transmit 1) A: Low
VCO Lock
Voltage
2) A: High
(Check)
3) B: Low
4) B: High
10. Receive 1) A: Low
VCO Lock
Voltage
(Adjustment
2) A: High
& 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
switch the
2) SSG frequency: 10MHz
OCXO and the
SSG output: +0dBm (224mV)
internal refer-
ence oscilla-
tion
3) SSG frequency: 10MHz
SSG output: +10dBm (708mV)
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
116
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
DVM TX CV
DVM RX CV1
PC
SSG Rear REF IN TX
Spectrum TX REF OUT
analyzer
SSG Rear REF IN
Oscilloscope TX REF_LV
SSG Rear REF IN
Spectrum TX REF OUT
analyzer
F. counter TX REF_IN
PC
Power meter TX TX OUT
(CN802)
Adjustment
Parts Method
Check 1.0V or more
4.4V or less
1.0V or more
4.4V or less
PC 0.8V +0.15V, –0.05V
ADJ
Check 4.2V or less
PC 0.8V +0.15V, –0.05V
ADJ
Check 4.2V or less
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) ±0.1dB
ADJ
Disconnect the cable from TX
OUT and insert a cable from
power meter.
After the adjustment, connect
the cable to TX OUT.
Specifi cations / Remarks