Thanks to all for the responses. It makes sense, and yes, I do find that the mic is 'hotter' w/ the Mic Bias turned off. I had already been using the noise gate so that's probably why I didn't notice the little bit of extra noise. All sounds good.
73, Dale WA8SRA > I saved this detailed note that was posted on this list a couple of years > ago. Maybe Elecraft needs a KX3 FAQ with this info. > > ------------ > Re: KX3 - Buzzing in headphones varies with MON level > Posted By: kk7p > Date: Wed Jun 20, 2012 12:49 pm > > I dragged out my CM-500 to test this. > > The CM-500 gets its mic bias from BOTH the tip and the ring of the gray > mic > connector. This is too bad, because the tip voltage is controlled by the > MENU:MIC BIAS ON|OFF but the ring is always biased by the PTT/UP/DN logic > supply. > > To get around the problem, do the following: > > 1) MENU" MIC BIAS OFF > > You will find you need a lot less Mic Gain for full ALC action. In my KX3, > I > need about 30 if BIAS is ON, and 17 if BIAS is OFF, for full ALC. > > 2) Since the PTT/UP/DN is a digital logic supply, it may have some > residual > noise that the CM-500 passes as audio to the tip of the connector. > > Go to MENU: TX GATE and tap "1" to turn it ON then adjust VFO A for 01 or > 02, > whatever it takes to kill the residual buzz. > > In the case of my KX3 + CM-500, this cured the problem. And in Dave's > case, it > might not cure the problem of noisy neighbors, but will allow the KX3 to > better > ignore them! > > 73, > > Lyle KK7P > ---------- > > Thanks, Lyle. > > wunder > K6WRU > > On Apr 19, 2014, at 9:27 AM, "[email protected]" <[email protected]> > wrote: > >> I'm connecting a Yamaha CM500 headset to the KX3, and find that the >> microphone works properly regardless of the MIC BIAS setting (MIC BTN is >> set to OFF). >> >> As I recall, the few times I used the CM500 w/ the K3, the MIC BIAS had >> to >> be ON or the microphone produced no output. >> >> Any idea why the MIC BIAS setting doesn't seem to matter w/ the KX3? >> >> 73, Dale >> WA8SRA >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > > -- > Walter Underwood > [email protected] > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
