39
ADJUSTMENT
Measurement
Test-
equipment
Unit Terminal
Adjustment
Unit Parts Method
Specifications/RemarksConditionItem
TK-480/481
1. Sensitivity 1) SYS – GRP : 1 – 1 SSG Panel ANT Check 12dB SINAD or more.
check SSG output : –116dBm
MOD : 1kHz AF VTVM
DEV : ±3kHz (TK-480)
Oscilloscope
:±1.5kHz (TK-481) Distortion
meter
2. Squelch 1) SYS – GRP : 4 – ✽ Panel
Encoder
Adjust to point of
adjustment Select SQL ✽ ✽ ✽ knob closing squelch.
in tuning mode.
SSG output : 3dB below to
12dB SINAD level
3. Squelch 1) SYS – GRP : 4 – 1 Check Squelch must be opened.
check
SSG output : 12dB SINAD level
See Note. 2) SSG output : OFF Squelch must be closed.
Note : When squelch is adjusted, the microcomputer simultaneously reads and writes the RSSI level. Do not write adjustment values without the SSG
connected.
Measurement
Test-
equipment
Unit Terminal
Adjustment
Unit Parts Method
Specifications/RemarksConditionItem
Receiver Section
22. BATT 1) SYS – GRP : 4 – 1
Power meter
Panel ANT Panel
Encoder
Check Can not transmit.
detection BATT terminal voltage : 5.7V Deviation knob LED (TX) blinks.
check PTT : ON meter
Oscilloscope
2) BATT terminal voltage : 6.5V Transmit
PTT : ON AG
AF VTVM
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.
