One of my first transmitters was a Millen with a keyed 6L6 crystal oscillator and an 807 final. So I know what chirp sounds like.
It sounded like chirp to me. Wes --- On Mon, 12/7/09, Vic K2VCO <v...@rakefet.com> wrote: > From: Vic K2VCO <v...@rakefet.com> > Subject: Re: [Elecraft] [k3] NB & Chirp > To: "Wes Stewart" <n...@yahoo.com> > Cc: "Elecraft Reflector" <elecraft@mailman.qth.net> > Date: Monday, December 7, 2009, 11:26 PM > Wes Stewart wrote: > > I worked and have since been listening to J79WE on 40m > CW for some time. The wind is > > blowing about 40 mph so the power lines are acting up > and I've been tweaking the noise > > blanker. > > > > While playing around I noted that his signal had > developed some chirp. I thought that > > strange, since he was clean when I worked him. I > fired up old reliable, my TS870 and > > listened to him and he was T9 with no chirp (and no > audio distortion). On the K3 he > > definitely had chirp, then I happened to turn off the > noise blanker and the chirp went > > away. > > > > The Noise blanker setting were IF=MED4 and > DSP=T3-7. The chirp seems to be related to > > the DSP part of it. > > > > Anyone else notice this? > > Are you sure it was chirp -- a change in frequency when > keying? Or was it a softening of the leading edge of the > keyed elements? > > The latter is characteristic of the DSP noise blanker when > it's at an advanced setting, like T3-7. Some distortion is > part of the tradeoff for noise blanking. > > I used to say "you know, it sounds like a guy with a > slow-starting crystal oscillator" until I realized that you > very rarely hear any crystal-controlled rigs these days. > -- 73, > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco > ______________________________________________________________ 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
