[Elecraft] Rear Mike Jack Question

[Andrew Hebden]

Hi,
Sounds a bit like RF getting into the mic line. Does it happen when running into a dummy load?
I use a Koss headset like this with no problems.

Andrew G8BYB

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of N4ZR
Sent: 23 August 2020 16:57
To: Elecraft List <elecraft at mailman.qth.net>
Subject: [Elecraft] Rear Mike Jack Question

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.

Have I inadvertently messed up another setting, or perhaps a failure in the mike?

--
73, Pete N4ZR
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