Thanks for the nice explanation Bill. It is effective but weird. Somone needs to make a movie. Steve N4LQ n...@carolina.rr.com ----- Original Message ----- From: "Bill W4ZV" <btipp...@alum.mit.edu> To: <elecraft@mailman.qth.net> Sent: Thursday, August 27, 2009 7:12 AM Subject: Re: [Elecraft] [K3] K3 NR triggering
> > > > Steve Ellington wrote: >> >> I just had a CW QSO on a noisy 80m. Here's what I noticed with NR set for >> F1-3. BW set for 2.5 kHz. >> QRN very loud! I pushed NR. Band goes almost totally silent. Calling CQ >> with >> the bug was like being in TX mode but I was using QSK as always. >> Wow...Nice >> and quiet. Then someone answered my CQ. On his very first DIT, the noise >> level jumped up and stayed up throughout the entire QSO. It was quieter >> than >> no NR at all but why should it stay that way??? >> > > Remember that NR is an adaptive filter. When you perturb it with a > coherent > signal it rebuilds the filter around that signal. F1 is the longest tap > setting which means it has the greatest stored data stream and will take > the > longest to respond when you add new data (i.e. a signal). Once the new > input to the filter (signal plus noise) is steady state, the filter will > then stay in that state until the inputs change again (i.e. when the > signal > goes away). > > 73, Bill > -- > View this message in context: > http://n2.nabble.com/K3-NR-triggering-tp3521099p3524344.html > Sent from the [K3] 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
