Max,

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I first ran into this difference years ago when trying to use my MD-1 Desk Microphone with a newly acquired (at the time) FT-920 Transceiver. If you look at the schematic of, for instance, the MD-1 compared to the MD-100 you can see the difference. BUT, note also that there was a later version of the MD-1 that had the updated wiring. Seems, if I recall correctly, that there was an MD-1b8 that I had but that the later version, MD-1c8, had that wiring updated. I have since updated both MD-1’s that I have here to “c8 status.” If you cannot find the details, let me know and I can do some digging here to help you.

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73, Bill, W9MXQ

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From: [email protected] <[email protected]> On Behalf Of Max Donoghue
Sent: Wednesday, August 10, 2022 2:32 PM
To: [email protected]
Subject: Re: [YaesuFT847] FAST button not working through mic jack

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Thanks Bill,

I'll have to trace the lines from the mic jack to the front panel board and try and sort out which is which.

Max