Tony Fegan VE3QF wrote: > > I am quite aware that the gurus at Elecraft > are extremely busy and need evidence that firmware changes are > beneficial. That is why I asked that those with the KRX3 should try my > method and report their findings. > The K3 has a great CW receiver but SSB improvements seem to be on the > back burner. > Tony, I verified that intelligibility is maintained with a null in the passband center as you suggested, and it's an interesting effect. But I'm not convinced that this will bring an improvement in QRM immunity. QRM invariably encroaches from the top or bottom of the passband, not from the middle.
Two pieces of spectrum spanning 350-2400hz are used in your scheme. I suspect that this will actually be more vulnerable to QRM than using K3's conventional tight ssb filtering in the range of 1.3-1.8Khz width. If the hypothesis is that the decreased total bandwidth of the scheme will yield improved intelligibility of very weak signals via better s/n ratio - I'd like to see some recordings made to test this because I wouldn't consider it a given. 73, Barry N1EU -- View this message in context: http://n2.nabble.com/K3-SSB-Contour-Filter-%28reduce-total-bandwidth%29-tp1687580p1689959.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
