John, I could be wrong, but if you have PTT enabled by CAT, then you don't need a com port. Vice versa, if you have PTT enabled by a com port, then don't select CAT. And you might double-check the audio settings. I'm not at all familiar with the FT-991A, but they don't look right to me.
David AD4TJ
On Monday, April 1, 2024 at 06:09:46 PM EDT, John Madden <n4ejm2019@...> wrote:
