Here´s a description on how connect UP/DOWN and PTT to Yaesu FT-100.
Here below does I a description how components shall connect to radio.
6-pins modular jack
Mic-jack Yaesu FT-100 / 90 / 8100.
Pin 1: SW 2 multi-function switching
Pin 2: N.C. (9600bps packet data output FT-90)
Pin 3: + 9 v
Pin 4: GND
Pin 5: Microphone Input
Pin 6: SW 1 PTT, UP och DOWN
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