Kenwood TK-80 Service Manual page 111

KAT-2 (Internal Automatic Antenna Tuner)
Adjustment
Item Condition
1. Automatic 1) Display: 2MHz
antenna Mode: CW
tuner check Dummy load: 20Ω
Set silver-point of TC1 to 45°
Silver-point
Press [AT TUNE] key
2) Dummy load: 150Ω
Press [AT TUNE] key
3) Dummy load: 50Ω
Press [AT TUNE] key
Terminal Function
CN No. Pin No. Pin Name
CN3 1 POD1 VC101 position detection signal
2 POD2 VC102 position detection signal
3 VREF AT reference voltage (5V)
4 ATG AT GND
5 PR22 Motor rotation direction control 4
6 PR21 Motor rotation direction control 3
7 PR12 Motor rotation direction control 2
8 PR11 Motor rotation direction control 1
9 ATA AUTO/THRU switch
10 APRE Preset control select
11 SPED Motor speed control
12 ATI Preset AT install. "L": Install
13 14S 14V (switched)
14 5A 5V
15 DGND Digital GND
16 DGND Digital GND
Measurement
Test-
Unit Terminal
equipment
Oscilloscope
Dummy
load
Function
Adjustment
Unit Parts Method
AT TC1 Check
CN No. Pin No. Pin Name
W1 1 AT1 AT signal 1
2 GND GND
W2 1 AT2 AT signal 2
2 GND GND
W103 1 24AT AT band bata 22.00000~26.99999MHz
2 21AT AT band bata 19.00000~21.99999MHz
3 18AT AT band bata 14.50000~18.99999MHz
4 28AT AT band bata 27.00000~29.99999MHz
5 14AT AT band bata 8.00000~14.49999MHz
6 4AT AT band bata 2.40000~4.49999MHz
7 7AT AT band bata 4.50000~7.99999MHz
8 GND GND
TK-80
Specifications/
Remarks
SW meter decreases,
then AT is stop.
Function
97