Excuse me for butting in but I think what you may be looking for was made by W4RT. He is no longer in business. I have two FT-817’s that have his board in them. The board allows you to have a CW and SSB filter installed. W4RT used Collins filters on his board. These are very to find.
Robin
W4IEN
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On Jun 27, 2024, at 17:12, Tobias KK7BCO/2M0TFF <feltusfecit1@...> wrote:
?Sotabeams makes a DSP filter board, I believe that is what you are thinking of.
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