Kenwood NXR-901 Service Manual page 86

NXR-901
Receiver Section
Item Condition
1 MCF 1) Narrow
Tracking generator
Output: –20dBm
Spectrum analyzer
Frequency: 73.05MHz
Span: 50kHz
2. Discriminator 1) Narrow
Frequency: Desired frequency
SSG output: –53dBm (501µV)
SSG MOD: 1kHz
SSG DEV: 1.5kHz
AF output: 2V/4
3. RD Level 1) Channel spacing
: Analog Narrow
Connect the SSG to the RX
ANT.
SSG setting
Frequency: Desired frequency
Output: –53dBm (501µV)
MOD: 1kHz
DEV: ±1.5kHz
4. RA Level 1) Channel spacing
: Analog Narrow
Connect the SSG to the RX
ANT.
SSG setting
Frequency: Desired frequency
Output: –53dBm (501µV)
MOD: 1kHz
DEV: ±1.5kHz
5. Receiver 1) Channel spacing
Sensitivity : Analog Narrow
Check Connect the SSG to the RX
ANT.
SSG setting
Frequency: Desired frequency
MOD: 1kHz
DEV: ±1.5kHz
AF: 0.45V/4
6. RF AGC 1) Channel spacing
: Analog Narrow
SSG setting
Frequency: Desired frequency
MOD: OFF
Level: 0dBm
2) Channel spacing
: Analog Narrow
SSG setting
Frequency: Desired frequency
MOD: OFF
Level: –25dBm
86
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Tracking RX CN46 RX
generator
Spectrum CN47
analyzer
SSG Rear RX ANT RX
AF VM TEST/
SPKR
jack SPO
(pin 12)
4 load
SSG Rear RX
AF VM ANT
CON-
TROL
I/O jack
RD (pin
10)
SSG Rear RX
AF VM ANT
CON-
TROL
I/O jack
RA (pin
11)
SSG Rear RX
Distortion ANT
meter TEST/
SPKR
jack
SPO
(pin 12)
4 load
SSG Rear RX
Spectrum RX ANT
analyzer CN68
Adjustment
Parts Method
L232 Adjust it to look like Refer to Fig. 1. (Page 80)
L246 the wave in fi gure 1.
L286 Adjust AF output
max.
PC 80mV ±5mV
ADJ
PC 400mV ±20mV
ADJ
Check –115dBm (0.4µV) or less
Measure 12dB SINAD SSG
level to use squelch adjust-
ment.
PC Value: 128 Measure CN68 terminal level
ADJ : –38dBm~–26dBm
Check Measure CN68 terminal level
: –45dBm~–40dBm
Specifi cations / Remarks