May I suggest that one of the necessities of using APF is to throttle back the RF gain so that the AGC is not pushing up the noise to the level of forcing what sounds like ringing. When I'm hearing what sounds like ringing, moving back the RF gain (or removing PRE, or using ATT) will usually clear it up. Using slow AGC usually does NOT help much, but backing off RF gain so the background noise is only moderate or less usually helps.
73, Guy. On Wed, Jan 26, 2011 at 6:52 PM, Barry N1EU <barry.n...@gmail.com> wrote: > > Forget it - full stop! > > I just ran a spectral analysis of the current firmware versus the very > first > APF implementation (mcu 4.17 dsp 2.65) from 11/3/10 AND THE PLOTS ARE > ABSOLUTELY CONGRUOUS! The APF implementation hasn't changed a bit (or a > byte). > > Have a look: http://n1eu.com/k3apf.gif > > magenta and green plots are taken with width = 200hz > aqua and yellow plots are taken with width = 100hz > > Barry N1EU > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/APF-tp5963894p5964669.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
