[Elecraft] Rear Mike Jack Question

[Don Wilhelm]

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.
>