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Icom Mic Connector

1 - Mic Input
2 - +8v DC output
3 - Freq UP/DN *
4 - Squelch Switch
5 - PTT
6 - Gnd (PTT Gnd)
7 - Gnd (Mic Gnd)
8 - AF Outout
* Ground this lead directly to move one way, through a 470 ohm resistor to
move the other way. I forget which way.

Great memory, Roy!  I had to look it up. :-)  UP is a hard ground to pin 5, 
and DOWN is to the same pin, but thru a 470 ohm resistor.

73, Ken

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