Mic Buttons - Yaesu FT-100 Undocumented

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, DOWN
The circuit below gives you PTT, UP, DOWN, ACC, P, P1, and P. Don't forget that you
can program the functions of P, P1 and P2 on the FT-100:
When you try to use various mics with the FT-100D you may find that you have muffled
or very low apparent audio drive level. This may be due to the fact that the mic you are
trying to use has a relatively high output impedance as compared to the input impedance
of the FT-100D. This can result in the low audio and/or muffled transmit audio problems.
There is a pre-amp design available at http://hometown.aol.com/ampmicro.

Mic Buttons

The microphone MH36B has a complete set of numeric buttons but they cannot be used
for numeric frequency input. They can only be used to send DTMF tones in FM mode by
holding in the PTT and simultaneously pressing the numeric sequence. There is no audio
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