Kenwood TK-880 series, Service Manual

Page: 51 / 75

51
ADJUSTMENT
Measurement
Test-
equipment
Unit Terminal
Adjustment
Unit Parts Method
Specifications/Remarks Condition Item
TK-880
Receiver Section
1. Discriminator 1) Set test mode SSG Rear ANT TX-RX L6 AF output voltage
CH : CH1 - Sig1 panel (A/2) maximum.
SSG output : –53dBm AF VTVM ACC
AF : 1.4V/4
Ω
Oscilloscope (EXT.SP)
2. Sensitivity 1) Set test mode SSG ANT “L SENS 25” E,E4
Select “SENS” in tuning mode. Adjust for maxi-
“L SENS” AF VTVM ACC mum SINAD. E3
SSG freq’ : See freq’ table Distortion (EXT.SP)
SSG output : –118dBm/0.31
µ
V meter
SSG MOD : 1.5kHz Oscilloscope
AF output : 1V/4
Ω
AG
2) “C SENS” Adjust for maxi-
SSG freq’ : See freq’ table mum SINAD.
3) “H SENS” “H SENS 250”
SSG freq’ : See freq’ table
3. Squelch 1) Set test mode Squelch must be
Select “nL SQL” in tuning mode. closed once.
SSG freq’ : See freq’ table Then adjust for
SSG output : Sensitivity squelch open point.
value of 12dB SINAD.
SSG MOD : 1.5kHz (Narrow)
2) “nC SQL”
SSG freq’ : See freq’ table
3) “nH SQL”
SSG freq’ : See freq’ table
4) “sL SQL”, “sC SQL”, “sH SQL”
SSG freq’ : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 2.4kHz (Wide 4k)
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 5k)
4. RSSI (Low) 1) Set test mode Writing values only.
Select “nL LRSI” in tuning mode.
SSG freq’ : See freq’ table
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 1.5kHz (Narrow)
2) “nC LRSI”
SSG freq’ : See freq’ table
3) “nH LRSI”
SSG freq’ : See freq’ table
4) “sL LRSI”, “sC LRSI”, “sH LRSI”
SSG freq’ : Same as
narrow adjustment.
SSG output : Sensitivity
value of 12dB SINAD.
SSG MOD : 2.4kHz (Wide 4k)
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 5k)