Set MIC SEL to RPL BIAS. You do not need the high gain amp with that
mic. It is likely producing feedback as you have it set.
73,
Don W3FPR
On 8/23/2020 11:56 AM, N4ZR wrote:
Recently, I began trying to use the rear microphone jack on my K3 with
my Yamaha boom mike, instead of using a stand-alone USB sound card and
feeding the signal to the LIN IN jack. This worked fine for a couple of
weeks, but today when I tried it, I got very loud white noise driving my
radio and amp essentially to full scale. I have MIC SEL set to RPH BIAS,
which has worked in the past. Any MIC gain setting over 7 drives the amp
to full output. When I pull the mike plug out of the jack, the problem
goes away.
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