Receiver Section - Kenwood NX-300 Service Manual
Uhf digital transceiver
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Also See for NX-300:
- Service manual (172 pages) ,
- Operating instructions (2 pages) ,
- Function reference (608 pages)
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Mode
Signaling
Audio
-
NXDN
CWID
-
• Balance is common with all the above deviation adjustments. If Balance (Transmitter Section 3) has already adjusted, please skip Step1 and adjust from
Step2.
• Maximum Deviation (Analog Wide/Narrow) is common with all the analog signaling deviations and CWID Deviation (NXDN Very Narrow). If Balance and
Maximum Deviation (Analog Wide/Narrow) (Transmitter Section 5) have already adjusted, please skip Step2 and adjust from Step3.
Receiver Section
Item
Panel tuning mode
1. AF level
[Panel test mode]
setting
1) CH-Sig: 1-1
SSG output:
–47dBm (1mV)
(MOD: 1kHz/±1.5kHz)
Wide/Narrow: Narrow
Beat Shift: Uncheck
Compander: Uncheck
(K,K3) Sensitivity adjust
2. Sensitivity 1
1) Adj item: [SENS1]
adjust
Adjust: [✳✳✳]
(K,K3)
2) Adj item:
[L SENS1]→
[L' SENS1]→
[C SENS1]→
[H' SENS1]→
[H SENS1]
Adjust: [✳✳✳]
Press [ ] key to store
the adjustment value.
3. Sensitivity 2
1) Adj item: [SENS2]
adjust
Adjust: [✳✳✳]
(K,K3)
2) Adj item:
[L SENS2]→
[L' SENS2]→
[C SENS2]→
[H' SENS2]
Adjust: [✳✳✳]
SSG output:
–90dBm (7.08µV)
(MOD: 1kHz/±1.5kHz)
Press [ ] key to store
the adjustment value.
3) Adj item: [H SENS2]
Adjust: [✳✳✳]
SSG output:
Press [ ] key to store
the adjustment value.
ADJUSTMENT
Wide
Step1. Balance adjust
Step2. Maximum Deviation (NXDN Narrow)
-
Condition
PC test mode
equipment
1) Test Channel
SSG
Channel: 1
DVM
Test Signaling
AF VTVM
Mode: Analog
Dummy
Signaling: 1
load
Wide/Narrow: Narrow
Beat Shift: Uncheck
Compander: Uncheck
SSG output:
–47dBm (1mV)
(MOD: 1kHz/±1.5kHz)
1) Adj item:
SSG
[Sensitivity 1]
AF VTVM
2) Adj item: [Low],
Oscilloscope
[Low'], [Center],
[High'], [High]
Press [Apply All]
button to store the
adjustment value.
1) Adj item:
[Sensitivity 2]
2) Adj item: [Low],
[Low'], [Center],
[High']
SSG output:
–90dBm (7.08µV)
(MOD: 1kHz/±1.5kHz)
Press [Apply All]
button to store the
adjustment value.
3) Adj item: [High]
Press [Apply All]
button to store the
adjustment value.
Necessary adjustment and order
Narrow
Measurement
Test-
Unit Terminal Unit
Panel
ANT
Panel
Universal
connector
Panel
ANT
Panel
Universal
connector
NX-300
Very Narrow
Step1. Balance adjust
Step2. Maximum Deviation (NXDN Very Narrow)
Step1. Balance adjust
Step2. Maximum Deviation (Analog Narrow)
Step3. CWID Deviation (NXDN Very Narrow)
Adjustment
Specifi cations /
Parts
Method
Volume
Turn the Volume
0.63V±0.1V
knob
knob to obtain
0.63V AF output.
[Panel
Write the value as
tuning
followings
mode]
[L SENS1] / [Low]
[
],
: 120
[
]
[L' SENS1] / [Low']
: 135
[PC test
[C SENS1] / [Center]
mode]
: 145
[ ],[ ]
[H' SENS1] / [High']
: 160
[H SENS1] / [High]
: 173
(The RSSI level is
shown on the sub
LCD display and PC
window.)
1. Change the ad-
justment value to
get the maximum
RSSI level.
2. Increase the
adjustment value
to seek "NX-300
ADJ Point" of
RSSI level.
(Refer to right.)
Write the value as
followings.
[H SENS2]/[High]
: 245
Remarks
NX-300
Adj Point
1
256
Adjustment value
53
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