Hi Bill Yes, I was using headphones. I will do further tests with the internal 2 tone generator and see if I still get the oscillation. Unfortunately I have very good hearing so every pip and squeak I can hear. Even with the sidetone running I can hear that mysterious relay resonance when keying.
If Elecraft releases a mod or update I may try that at a later date. In the meantime its of no consequence to me. I was unfortunately spending a lot of time trying to EQ a mic and thats why I noticed the artifact. 73 John --- On Mon, 5/3/10, Bill W4ZV <btipp...@alum.mit.edu> wrote: > From: Bill W4ZV <btipp...@alum.mit.edu> > Subject: Re: [Elecraft] k3:TX Monitor-some odd sound -beta? > To: elecraft@mailman.qth.net > Date: Monday, May 3, 2010, 7:54 AM > > > > Just noticed this when playing around with the K3's > monitor. > > > > With the Gate off > > EQ flat > > MH2 hand MIC > > TX test mode > > Band 7mhz > > > > While whistling there is a odd artifact. If I whistle > I get a sound that > > sounds like a oscillator pulling in a receiver. > I dont get any odd sounds > > with normal voice testing > > > > .With a continuous whistle I get this artifact > that is a mirror of the > > whistle, however it seems to shift frequency or pull > the louder you > > whistle.It might be a IMD product? I have never > noticed this before in > > the K3's monitor. I will also check the clubs K3's and > report back. > > > > Anyone else get this? > > > > Are you using headphones or the internal speaker? If > the latter, physical > microphonic modulation of the VCO can cause spur > artifacts. I've never > experienced this because I never use the speaker, but I've > noticed it on CW > signals from other K3s. The audible PITCH tone can > modulate the VCO causing > spurs at +/- PITCH setting. I suppose the same could > happen in SSB if > MONITOR volume were high enough. > > Elecraft has a stiffener/damper fix for the VCO board if > this is the problem > you're having. > > 73, Bill > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/k3-TX-Monitor-some-odd-sound-beta-tp4997305p4998207.html > Sent from the Elecraft mailing list archive at Nabble.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 > ______________________________________________________________ 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
