Kenwood NX-820 Service Manual page 82

NX-820
Receiver Section
Item
Panel tuning mode
1.AF level [Panel test mode]
1) CH-Sig: 1-1
setting
SSG output:
–47dBm (1mV)
(MOD: 1kHz/±1.5kHz)
Wide/Narrow: Nar-
row
Beat Shift: Uncheck
Compander: Un-
check
2. Sensitivity 1 This adjustment
can be performed
only PC test mode.
3. Sensitivity 2 This adjustment
can be performed
only PC test mode.
*Note:
12dB SINAD or more at -118.5dBm (Mod: 1kHz/±1.5kHz) with preset digit value at each adjustment point.
If less than 12dB SINAD, execute the "Readjustment method 1" procedure at the failed adjustment point.
[Readjustment method1]
Decrease the digit value to get 12dB SINAD at -118.5dBm (Mod: 1kHz/±1.5kHz).
If it is still NG, execute the "Readjustment method 2" procedure.
[Readjustment method2]
If the sensitivity is still NG for [Low] or [Low'] point by using method1, conduct the following procedure.
1. Change the data of the failed adjustment point. ([Low] or [Low']) to the following, and store it.
Sens1 Sens2
[Low] 54 69
[Low'] 95 108
2. Open Sensitivity1, and select the failed adjustment point.
3. Set SSG to the following.
SSG Output: -118.5dBm (0.266uV)
4. Decrease the data until the sensitivity becomes 12dB SINAD.
5. Press [Apply All] button.
4. RSSI 1) Adj item: [RRSS]
reference Adjust: []
*5 2) Adj item:
[R.RSS]
[R.R.SS]
[Analog
[R.R.S.S]
Narrow]
[R.R.S.S.]
[R.R.S.S._.]
SSG output: 12dB
SINAD level -3dB
(MOD: 1kHz/±1.5kHz)
82
ADJUSTMENT
Condition
PC test mode
equipment
1) Test Channel SSG
DVM
Channel: 1
AF VM
Test Signaling
4
Mode: Analog
Dummy
Signaling: 1
load
Wide/Narrow: Narrow
Oscillo-
Beat Shift: Uncheck
scope
Compander: Uncheck
SSG output:
–47dBm (1mV)
(MOD: 1kHz/±1.5kHz)
1) Adj item: SSG
[Sensitivity 1] AF VM
2) Adj item: [Low], 4
[Low'], [Center], Dummy
[High'], [High] load
Press [Apply All] Distortion
button to store the meter
adjustment value. Oscillo-
scope
1) Adj item: SSG
[Sensitivity 2] AF VM
2) Adj item: [Low], 4
[Low'], [Center], Dummy
[High'], [High] load
Press [Apply All] Distortion
button to store the meter
adjustment value. Oscillo-
scope
MOD: 1kHz/±1.5kHz
1) Adj item: SSG
[RSSI Reference AF VM
(Analog Narrow)] 4
2) Adj item: [Low], Dummy
[Low'], [Center], load
[High'], [High] Distortion
SSG output: 12dB meter
SINAD level –3dB Oscillo-
(MOD: 1kHz/±1.5kHz) scope
Measurement
Test- Termi-
Unit Unit
nal
ANT
Ext.SP
con-
nector
ANT
Ext.SP
con-
nector
ANT
Ext.SP
con-
nector
ANT
Ext.SP
con-
nector
Adjustment
Parts Method
[Panel Volume Up/Down 2.83V±0.3V
Key to obtain ( Volume Button in PC
tuning
test mode screen)
2.83V AF output.
mode]
(2.0W @ 4 load)
[ ],
[ ]
[PC test
mode]
[ ],
[ ]
[PC test Write the value as
mode] followings,
[Low]:34 (Preset)
[ ],
[Low']:75 (Preset)
[ ]
[Center]: 117
(Fixed)
[High']: 155 (Fixed)
[High]: 192 (Fixed)
[PC test Write the value as *Note
mode] followings,
[Low]: 59 (Preset)
[ ],
[Low']: 98 (Preset)
[ ]
[Center]: 137
(Preset)
[High']: 179
(Preset)
[High]: 209
(Preset)
[Panel tuning mode]
After input signal
from SSG, press
[ ] key to store
the adjustment
value.
[PC test mode]
After input signal
from SSG, press
[Apply] button to
store the adjust-
ment value.
Specifi cations/
Remarks