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

[Pete Smith N4ZR]

I don't think RFI is implicated.  I can hear the loud background noise 
even with the RF turned way down.  This is something else, I believe, 
perhaps something about the way the gain is distributed, or???

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.

On 11/21/2021 8:40 PM, Rick Tavan wrote:
> 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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> -- 
> --
>
> Rick Tavan
> Truckee and Saratoga, CA