[Elecraft] Background Noise with Mike Plugged in to Rear Mike Jack

[Rick Tavan]

Hi, Pete. Try a dynamic mic or use the front panel (ugh) mic connector.
I've had RFI problems at high power using a CM-500 on the rear panel mic
jack. Elecraft are working on a fix. My Heil headset with dynamic mic works
fine.

73,

/Rick N6XI

On Sun, Nov 21, 2021 at 5:32 PM Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:

> I don't normally operate phone, but wanted to contribute a few QSOs to
> my club in SS SSB.  So I recorded messages on my external USB sound
> card, using Audacity.  They sounded fine, both on a speaker and on my
> K3's monitor.  So then I plugged my Yamaha CM-500 condenser mike headset
> into the rear microphone jack, with MIC SEL = rP.L bIAS.  That worked
> OK, but there was a very high level of white noise, audible both with
> live voice and while playing recorded contest messages.  I was reading
> 700 watts out without talking.
>
> Experimenting, I discovered that the source of the noise was definitely
> the mike on the rear microphone jack.  I also didn't like the fact that
> in this setup the mike was live while recorded messages were playing.
>
> How can I rig things so that the mike doesn't contribute this high level
> of background noise, and how can I manage things so that the microphone
> is muted when the recorded messages are playing through the line in jack.
>
> --
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
>
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-- 
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Rick Tavan
Truckee and Saratoga, CA