ADJUSTMENT
Measurement
Test-
equipment
Unit
Terminal
Adjustment
Unit
Parts
Method
Specifications/Remarks
Condition
Item
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/Remarks
Condition
Item
Summary of Contents for FM Transceiver TK-481
Page 49: ...TK 480 481 TK 480 481 57 BLOCK DIAGRAM ...
Page 54: ...63 TK 480 481 ...