At a Ham Fest last year I purchased a Kenwood
MC-60 microphone with the intention of using it
with my ICOM IC-746 transceiver. Figuring out the
microphone and PTT connections was pretty straight
forward. However making the Up and Down switch
work with my ICOM was not that straight forward.
Kenwood uses separate lines for the Up and Down
functions while ICOM uses one. Having other things
to do at the time, I simply hooked up the
microphone and the PTT switch and used it without
the Up/Down function.
Now I'm sorry I took so long to get back to the
project. After doing some investigation I figured
out (using the original ICOM microphone) that the
Up function on the ICOM was achieved by grounding
pin 3 on the ICOM microphone connector. The Down
function was done by grounding pin 3 through a 470
ohm resistor. The solution was simple. Add a 470
ohm resistor across pins 3 and 4 on the back of
the connector in the base of the MC-60 and connect
pin 4 of the microphone to pin 3 on the ICOM.
David M. Hitchner - email@example.com
KD5EIS - firstname.lastname@example.org.MODIFICATION.NET
Baton Rouge Area Scanning