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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
F121 VHF, F221 UHF they both use the latest Version 1.7. For F121 Factory default as follows:Open your CS-F100 software, enter RX TX frequency below, and write to the radio.Ch1: 136.100 MHzCh2: 155.100 MHzCh3: 173.900 MHz For F221 Enter RX TX frequency belowCh1: 440.000MHzCh2: 460.000MHzCh3: 489.000MHz, then write to your radio Or you check from this site:http://www.two-way-radio-tools.com/icom.html HP
You need to replaced the "voice coil". that thing that youve been desoldering and soldering is the voice coil. It has two wires- white and black. it is already grounded and need to be replace (the fact that it humms..). my company distribute wow magic sing here in Philippines and we can easily repair that.