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 <r...@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.n...@gmail.com > <mailto:pete.n...@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. >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to rta...@gmail.com <mailto:rta...@gmail.com> > > > > -- > -- > > Rick Tavan > Truckee and Saratoga, CA > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > <http://mailman.qth.net/mailman/listinfo/elecraft> > Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> > Post: mailto:Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> > > This list hosted by: http://www.qsl.net <http://www.qsl.net/> > Please help support this email list: http://www.qsl.net/donate.html > <http://www.qsl.net/donate.html> > Message delivered to david.n5...@gmail.com <mailto:david.n5...@gmail.com> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
