George, this is a very timely post as I was trying to do exactly the same yesterday. I followed the recipe that Steve K3FZT posted, but I am having issues with the PTT. I am using an IC-9700 as the radio. As VA3MCT said, the way to do this would be with VOX. Somehow, I am unable to get VOX to work with the 9700 connected to the PC, so I must be missing something simple. If anybody has suggestions, please let me know!
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Facundo-KK4ODA
