Question about Heil Sound Audio Players & Recorders
Posted by Anonymous on
The Heil "ICM" microphone is designed to be used with certain Icom brand ham radios. These have a 8-pin round plug. Describing the pinout to you will depend upon your perspective, whether you are looking at it from the microphone plug itself, or the microphone socket on the front of the radio. Therefore, from the perspective of looking at the mic plug on the end of the mic cable, note that there is a notch or dimple in the plug that also lines up with the screw. Going clockwise from the notch, the pins are numbered 1 thru 7. Pin #8 is the center pin.
Pin 1 = mic input
Pin 5 = Push-to-talk (PTT)
Pin 6 = PTT ground
Pin 7= Mic ground
From the standpoint of an Icom transceiver, the remainder of the mic connector pins are as follows:
pin 2 = +8 volts DC (output from the radio)
pin 3 = frequency control up/down
pin 4 = squelch switch
pin 8 = audio output (level varies w/vol control)
Hope this helps
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
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