Kenwood TK-480 Service Manual page 24

Item Condition
22. BATT 1) SYS – GRP : 4 – 1
detection BATT terminal voltage : 5.7V
check PTT : ON
2) BATT terminal voltage : 6.5V
PTT : ON
Note : When the CPU is changed these adjustment values will become suitable values for NPSPAC, the deviations except MAX DEV in NPSPAC band
are automatically adjusted.
Receiver Section
Item Condition
1. Sensitivity 1) SYS – GRP : 1 – 1
check SSG output : –116dBm
MOD : 1kHz
DEV : ± 3kHz
1) SYS – GRP : 4 – ✽
2. Squelch
adjustment Select SQL
in tuning mode.
SSG output : 3dB below to
12dB SINAD level
3. Squelch 1) SYS – GRP : 4 – 1
check SSG output : 12dB SINAD level
See Note. 2) SSG output : OFF
Note : When squelch is adjusted, the microcomputer simultaneously reads and writes the RSSI level. Do not write adjustment values without the SSG
connected.
ADJUSTMENT
Measurement
Test-
Unit
equipment
Power meter Panel
Deviation
meter
Oscilloscope
AG
AF VTVM
Measurement
Test-
Unit
equipment
SSG Panel
AF VTVM
Oscilloscope
Distortion
meter
✽ ✽ ✽
Adjustment
Terminal Unit Parts
ANT Panel Encoder Check
knob
Adjustment
Terminal Unit Parts
ANT Check
Panel Encoder Adjust to point of
knob closing squelch.
Check
TK-480
Specifications/Remarks
Method
Can not transmit.
LED (TX) blinks.
Transmit
Specifications/Remarks
Method
12dB SINAD or more.
Squelch must be opened.
Squelch must be closed.
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