Hello, I push this message again, because I have the same question / issue... I am building a specific Arduino interface between a microHam stationMaster and the KAT500, but unfortunately I am not able to find any wiring/voltage concerning this serial «3.5 stereo jack» connector. If someone has the information, thanks in advance... I assume that it's RS232 compliant (so MAX232 needed for Arduino interface...) but even that, not sure... 73 Jean F4GXG
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