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Confidential
Icom IC-F8100 Antenna Tuner Control Protocol
Date: Aug 23
rd
, 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.
