Microphone Hum - MH2 on K3

[Brian - K1NW]

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[Brian - K1NW]

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[Don Wilhelm-4]

  Brian,

I would suggest you investigate the possibility of an open AF return
connection in the microphone or its plug.
Yes, there are other possibilities, but if it happened suddenly, then
perhaps a broken wire could be the only problem.

73,
Don W3FPR

On 4/3/2011 7:58 PM, radiori wrote:
> Follow-up to my original post. If I short PTT (pin 2) on the front panel
> microphone connector to either shell or ground (pin 8) the radio goes into
> transmit with NO hum.  Similarly if I short Mic Audio (pin 1) to shell or
> ground with VOX enabled the radio transmits with no hum. So perhaps it is
> the microphone.
>
> Thanks, Brian, K1NW
>
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