This "relay switching" arrangement you describe is typical of some mics
designed specifically for PA. Ham mics typically have one side of the mic
switch grounded in the microphone housing somewhere.
Connect one of the Red/Black leads to the PTT input, and the other to the
PTT ground (maybe the same as audio ground, I'm not familiar specifically
with the Corsair -- but it should be a direct chassis ground). You could
connect one directly to the common ground point in the microphone base --
then the other goes to the PTT input on the Corsair.
> According to Shure the Red and Black leads control an external relay.
> I connected the Red lead of the mic to pin #3 of the Corsair.
> I hit the mic key and the radio did not trip into transmit.
> I changed the Red lead for the Black and left Black off.
> I hit the key on the mic and no relay trip in radio.
> Now I am thinking that maybe the red lead needs to be on pin
> #3 and the black lead has to go to the same pin on the mic
> plug as the green and shield so that the relay on the radio trips.
> Has anyone on the list hooked up one of these before?
> I understand this mic is the upgrade to the Shure 444.
> They should wire up the same as to those red and black wires.
> Waiting and thankful for any help.
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