Kenwood FM Transceiver TK-481 Service Manual page 37

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