Kenwood TK-780 Service Manual page 49

Receiver Section
Item Condition
1. Discriminator 1) Set test mode
CH : CH1 - Sig1
SSG output : –53dBm
AF : 1.4V/4Ω
2. Sensitivity 1) Set test mode
Select "SENS" in tuning mode.
"L SENS"
SSG freq' : 146.050MHz
SSG output : –118dBm/0.31µV meter
SSG MOD : 1.5kHz
AF output : 1V/4Ω
2) "C SENS"
SSG freq' : 160.050MHz
3) "H SENS"
SSG freq' : 173.950MHz
3. Squelch 1) Set test mode
Select "nL SQL" in tuning mode.
SSG freq' : 146.050MHz
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 1.5kHz (Narrow)
2) "nC SQL"
SSG freq' : 160.050MHz
3) "nH SQL"
SSG freq' : 173.950MHz
4) "sL SQL", "sC SQL", "sH SQL"
SSG freq' : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 2.4kHz (Semi-wide)
5) "wL SQL", "wC SQL", "wH SQL"
SSG freq' : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 3.0kHz (Wide)
4. RSSI (Low) 1) Set test mode
Select "nL LRSI" in tuning mode.
SSG freq' : 146.050MHz
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 1.5kHz (Narrow)
2) "nC LRSI"
SSG freq' : 160.050MHz
3) "nH LRSI"
SSG freq' : 173.950MHz
4) "sL LRSI", "sC LRSI", "sH LRSI"
SSG freq' : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 2.4kHz (Semi-wide)
5) "wL LRSI", "wC LRSI", "wH LRSI"
SSG freq' : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 3.0kHz (Wide)
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
SSG Rear ANT TX-RX L6
panel (A/2)
AF VTVM ACC
Oscilloscope (EXT.SP)
SSG ANT
AF VTVM ACC
Distortion (EXT.SP)
Oscilloscope
AG
Adjustment
Parts Method
AF output voltage
maximum.
Adjust for
maximum SINAD.
Adjust for
maximum SINAD.
Adjust for
maximum SINAD.
Squelch must be
closed once.
Then adjust for
squelch open point.
Writing values only.
TK-780
Specifications/Remarks
49