AH-705 Antenna Tuner

[Steve Haynal]

Hi Group,

I am a fan of the AH-4 antenna tuner as it works well mounted remotely for the long wire antennas I drape over trees. But it is no longer manufactured. I recently purchased a AH-705 antenna tuner:

https://www.icomjapan.com/lineup/options/AH-705/

It turns out to use the same protocol as the AH-4. This link was very helpful to set it up:

https://www.fbnews.jp/202007/ww02/#:~:text=To%20connect%20the%20AH%2D4,DC%20power%20to%20the%20tuner.

I have been quite happy with the AH-705. I am "old school" and use 5W QRP and the interface on the back panel:

https://github.com/softerhardware/Hermes-Lite2/tree/master/hardware/enclosure/endcaps/kf7o/hl2_40b#atu

but I suspect it should work just as well with any AH-4 support provided by the IO board.

I have played with the atu-10 and atu-100, but found the tuning range more limited and lacked an easy weather proof assembly. 

73,

Steve

kf7o