开云体育A frequency entry device that attaches to the rear of the FT-8x7 series radios is connected to, and communicating with the radio via CAT commands over a serial port. A microphone that attaches to the front radio microphone jack communicates with the radio over the RJ45 connection and *likely* uses some special, non-CAT protocol/logic (if you could CAT control the radio over the mic connection I *suspect* that would have been noticed/documented by now). It would take a sophisticated device to translate the protocol the microphone 'speaks' with the CAT commands the radio accepts via the rear connection (the MH59 mic has a dedicated chip that controls all button interactions, translating them into a form of serial data). I *suspect* the FT-817/818 microphone jack on the radio is wired differently than on the FT-857/897 radios, and no external device can overcome that design issue. To confirm this, one would need to compare MH59 mic wiring diagram and then evaluate the mic connection of the FT-817 with that of the FT-857/897 radios. The three FT-8x7 radios share many, many similarities, but they are not identical, as easily proven by an examination of the physical board, the display circuitry, and the control (knobs/buttons) selection. (They are not the same radio MH59 circuit diagram:? It appears the microprocessor in the MH59 talks to and listens to the radio over pins 7 and 8 (the up/down button lines) FT-817 service manual:? FT-857 service manual:? I tried to follow the two circuit diagrams for the two radios, and I couldn't make sense of them. Interesting question, I hope the above can help a more knowledgeable reader figure out (and share) a definitive answer. Ken, N2VIP On Aug 15, 2024, at 03:58, Steve <g4vrr57@...> wrote:
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