Nx-800H(K3) Receiver Section - Kenwood NX-800 Service Manual

NX-800H(K3) Receiver Section

Item
Panel test mode
1. AF level
[Panel test mode]
setting 1) CH-Sig: 1-1
SSG output:
–47dBm (1mV)
(MOD: 1kHz,
Dev: ±1.5kHz)
2. Sensitivity 2 1) Adj item: [SENS2]
Adjust Adjust: [***]
(BPF adjust) 2) Adj item:
[L SENS2]Õ
[L' SENS2]Õ
[C SENS2]Õ
[H' SENS2]Õ
[H SENS2]
Adjust: [***]
Press [<] key to store
the adjustment value.
1) Adj item: [SENS1]
3. Sensitivity 1
Adjust Adjust: [***]
(BPF adjust) 2) Adj item:
[L SENS1]Õ
[L' SENS1]Õ
[C SENS1]Õ
[H' SENS1]Õ
[H SENS1]
Adjust: [***]
Press [<] key to store
the adjustment value.
ADJUSTMENT
Condition
PC test mode
equipment
1) Test Channel SSG
Channel: 1 DVM
Test Signaling AF VTVM
Mode: Analog Dummy
Signaling: 1 load (4Ω)
SSG output:
–47dBm (1mV)
(MOD: 1kHz,
Dev: ±1.5kHz)
1) Adj item:
[Sensitivity 2]
2) Adj item: [Low],
[Low'], [Center],
[High'], [High]
Press [Apply All]
button to store the
adjustment value.
1) Adj item:
[Sensitivity 1]
2) Adj item: [Low],
[Low'], [Center],
[High'], [High]
Press [Apply All]
button to store the
adjustment value.
Measurement
Test-
Unit Unit Parts
Terminal
ANT
Ext.SP
connec-
tor
NX-800/800H
Adjustment
Specifi cations /
Method
Volume Up/Down 2.83V±0.3V
[Panel
tuning knob to obtain
mode] 2.83V AF output.
[ ],[ ] (2.0W @ 4Ω load)
[PC test
mode]
[ ],[ ]
(Volum
Button in
PC test
mode
screen)
[Panel Write the value as Variable-Capacitor
tuning followings (Fixed). Tune voltage is
[L SENS2] / [Low] adjusted.
mode]
[ ],[ ] : 45 (Output voltage ad-
[L' SENS2] / [Low'] justment of IC205)
: 70
[PC test
mode] [C SENS2] / [Center]
[ ],[ ] : 120
[H' SENS2] / [High']
: 170
[H SENS2] / [High]
: 225
Write the value as Variable-Capacitor
followings (typical Tune voltage is
value). adjusted.
[L SENS1] / [Low] (Output voltage ad-
: 49 (Fixed) justment of IC206)
[L' SENS1] / [Low']
: 76 (Fixed) If sensitivity is low,
[C SENS1] / [Center] fine-tune the value.
: 113 (Fixed)
[H' SENS1] / [High'] [H SENS1] / [High]
: 147 (Fixed) Check Sens1
[H SENS1] / [High] FH(Narrow)
: 182 (Preset) RX Sensitivity >12dB
at SSG output:
-118dBm
(0.28uV).
If RX Sensitivity Out
of Specification,
set SSG output:
-90dBm (7.08uV),
FM:1.5kHz,
Align Sens 1 FH to
the last RSSI peak,
and -30 digit shift
from the last RSSI
peak.
Remarks
21