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Page: 1/ 3

Confidential

Icom IC-F8100 Antenna Tuner Control Protocol

Date: Aug 23rd, 2011

1. Pin Configuration

For AT-140/AT-130 (Icom’s auto-antenna tuner)

AD-119 GPIO / OPC-2205 ANT Tuner 側

Pin

No. Name Function @using AT-140 Operation

1 13.8 13.8 V output for Antenna

tuner

3 KEY Key signal input –0.5 to 0.8 V during tuning

11 START Start/through signal output

14 GND Connect to ground

Chart-1: Wiring Information

2. Control Method

Tuning operation works as below. (See Chart-2: Timing Chart)

1. Push and hold [TUNER(9)] keypad.

2. ”START” line turns from “H” to “L” for 500ms.

3. After approx. 300ms passed from “START” turned to “L”, AT-140 turns “KEY” line to “L”.

(Tuning operation start)

4. When “KEY” line turned to “L”, F8100 transmits a 10W signal on CW mode.

5. ”KEY” line turned “H” for 200ms after 20ms from the tuning operation has done, F8100

interprets that the tuning operation succeeded then “T” icon shows up on F8100 display. On

the other hand, “KEY” line turned “L” for 200ms after 20ms from the turning operation has

done, F8100 interprets that the tuning operation failed.

Page: 2/ 3

Push [TUNER] keypad

500mS

START

300mS 20mS 200mS

KEY

Tuning Starts Tuning Done

TX 10W (CW)

Chart-2: Timing Chart of Tuning Operation

*Using “Tuner Through”function

1. Push [TUNER(9)] keypad while “T”icon is shown on F8100 display. When “Tuner

Through”function activates, “T”icon disappears from F8100 display.

2. “START” line turns from “H” to “L” for 70ms.

70mS

START

KEY

“KEY” line stays “H”, no answer back is initiated.

Chart-3: Timing Chart of Tuner Through Operation

H

L

H

L

OUTPUT(Tx)

OFF

H

L

H

L

OK

NG

Page: 3/ 3

3. Control Signal Level

[START]

Voltage [V]

Chart-4: Signal Level of START line

[KEY]

Voltage [V]

Chart-5: Signal Level of KEY line

AT-140 Pin Configuration

5

0

More than 350 ms*

Less than 1V to start tuning

*For “Tuner Through” function ;Less than 250 ms

Approximately 5V

5

0

Automatic Tuning Process

Grounded

Approx. 5V

Time

Time