NXR-901
86
ADJUSTMENT
Receiver Section
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1 MCF
1) Narrow
Tracking generator
Output: –20dBm
Spectrum analyzer
Frequency: 73.05MHz
Span: 50kHz
Tracking
generator
Spectrum
analyzer
RX
CN46
CN47
RX
L232
L246
Adjust it to look like
the wave in fi gure 1.
Refer to Fig. 1. (Page 80)
2. Discriminator 1) Narrow
Frequency: Desired frequency
SSG output: –53dBm (501µV)
SSG MOD: 1kHz
SSG DEV: 1.5kHz
AF output: 2V/4
SSG
AF VM
Rear
RX ANT
TEST/
SPKR
jack SPO
(pin 12)
4
load
RX
L286
Adjust AF output
max.
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
SSG
AF VM
Rear
RX
ANT
CON-
TROL
I/O jack
RD (pin
10)
PC
ADJ
80mV
±5mV
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
SSG
AF VM
Rear
RX
ANT
CON-
TROL
I/O jack
RA (pin
11)
PC
ADJ
400mV
±20mV
5. Receiver
Sensitivity
Check
1) Channel spacing
: Analog Narrow
Connect the SSG to the RX
ANT.
SSG setting
Frequency: Desired frequency
MOD: 1kHz
DEV: ±1.5kHz
AF: 0.45V/4
SSG
Distortion
meter
Rear
RX
ANT
TEST/
SPKR
jack
SPO
(pin 12)
4
load
Check
–115dBm (0.4µV) or less
Measure 12dB SINAD SSG
level to use squelch adjust-
ment.
6. RF AGC
1) Channel spacing
: Analog Narrow
SSG setting
Frequency: Desired frequency
MOD: OFF
Level: 0dBm
SSG
Spectrum
analyzer
Rear
RX
RX
ANT
CN68
PC
ADJ
Value: 128
Measure CN68 terminal level
: –38dBm~–26dBm
2) Channel spacing
: Analog Narrow
SSG setting
Frequency: Desired frequency
MOD: OFF
Level: –25dBm
Check
Measure CN68 terminal level
: –45dBm~–40dBm
Summary of Contents for NEXEDGE NXR-901
Page 154: ...1 E CN300 RX_IF_VN ...