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

[Rick Tavan]

Interesting. I tried a ferrite and, although it reduced the problem, it
didn't cure it. I'm not sure it was a #31 mix, though, and I didn't wrap
that many turns. Will try again. Sure wish toroids were labeled!

Thanks,

/Rick N6XI

On Sun, Nov 21, 2021 at 5:55 PM David Herring <david.n5dch at gmail.com> wrote:

> I also had RF problems with the CM-500 plugged into the rear mic jack.
> The solution I’ve implemented so far was to wrap about 13 turns of the
> CM-500’s cord around a #31 toroid. It both shortened the cord which was way
> too long for my shack and eliminated the RF problem. A two-for-one
> solution. ;-)
>
> On rare occasions I like to use my D-104 mic in the front panel jack.  It
> too is adversely affected with RF issues.  As soon as I get a moment I’m
> going to try wrapping it’s cord around a #31 toroid and hope it works as
> well there as with the CM-500.
>
> I hope Elecraft is looking at the front panel mic jack as well as the rear
> when looking at solving the RF issue.
>
> 73,
> Dave - N5DCH
>
>
>
>
> > On Nov 21, 2021, at 6:40 PM, Rick Tavan <rick at tavan.com> 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
> <mailto: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
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-- 
--

Rick Tavan
Truckee and Saratoga, CA