ADJUSTMENT
Measurement
Test-
equipment
Unit Terminal
Adjustment
Unit Parts Method
Specifications/RemarksConditionItem
36
TK-480/481
1. Frequency 1) SYS – GRP : 4 – ✽ f. counter Panel ANT Panel
Encoder
TK-480 ±100Hz
adjustment Select FREQ ✽ ✽ ✽ knob : 815.500MHz
in tuning mode. TK-481
PTT : ON : 899.025MHz
2. Maximum 1) SYS – GRP : 4 – ✽
Power meter
Check 3.0W or more
power check Select HPOW 256
in tuning mode. Ammeter Panel ANT
PTT : ON
3. TX high 1) SYS – GRP : 4 – ✽ Panel
Encoder
2.5W ±0.1W
power Select HPOW ✽ ✽ ✽ knob 1.7A or less
adjustment in tuning mode.
PTT : ON
4. TX T/A 1) SYS – GRP : 4 – ✽
high power Select THPW ✽ ✽ ✽
adjustment in tuning mode.
PTT : ON
5. TX high 1) SYS – GRP : 1 – ✽, 7 – ✽ Check 2.0~3.0W
power check TA mode : OFF and ON
(Press [A] key, then [C] key) 1.7A or less
PTT : ON
6. TX low 1) SYS – GRP : 4 – ✽ Panel
Encoder
1.0W ±0.1W
power Select LPW ✽ ✽ ✽ knob 1.2A or less
adjustment in tuning mode.
PTT : ON
7. TX T/A 1) SYS – GRP : 4 – ✽
low power Select TLPW ✽ ✽ ✽
adjustment in tuning mode.
PTT : ON
8. TX low 1) SYS – GRP : 1 – ✽, 7 – ✽ Check 0.5~1.5W
power check Low power (Press [B] key) 1.2A or less
TA mode : OFF and ON
(Press [A] key, then [C] key)
PTT : ON
Transmitter Section
Common Section
1. Setting 1) BATT terminal voltage : 7.5V
Standard modulation
MOD : 1kHz
DEV : ±3kHz (TK-480)
±1.5kHz (TK-481)
2. VCO lock 1) SYS – GRP : 1 – 1
Power meter
TX-RX VC Check 0.5V or more.
voltage DVM
2) SYS – GRP : 7 – 1 4.3V or less.
PTT : ON
3) SYS – GRP : 7 – 1
TA mode : ON
PTT : ON
Measurement
Test-
equipment
Unit Terminal
Adjustment
Unit Parts Method
Specifications/RemarksConditionItem
