Try to keep the mic away from the radio speaker.check to see if its turned up to high.check your mic gain to make sure its like 1/2 open.If these fail then you could solder two 0.001 ceramic disc capacitors from the audio to the shield wires about 3" apart.then on the audio wire in between the 2 caps solder a 4700 ohm 1/4 w resistor.this should work.
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Try to keep the mic away from the radio speaker.check to see if its turned up to high.check your mic gain to make sure its like 1/2 open.If these fail then you could solder two 0.001 ceramic disc capacitors from the audio to the shield wires about 3" apart.then on the audio wire in between the 2 caps solder a 4700 ohm 1/4 w resistor.this should work.