RobertG wrote > Bill... > Every time I attempt to use APF I encounter so much ringing that it's > more or less unusable. I'd appreciate any hint that you might have about > "taming" this feature for use. Thanks.
Hi Robert, Reduce the gain and narrow the XFIL/DSP bandwidth such that the desired signal pops out of the noise. I generally don't use APF unless all signals in the passband are relatively weak. Ideally you don't want anything in the passband except band noise and the signal of interest. This may sound counterintuitive but IF QRM ALLOWS, try a relatively wide XFIL/DSP bandwidth (e.g. 400 Hz). I find this helps your brain/ears have better discrimination between the signal and noise. If you narrow XFIL/DSP too much, you may magnify ringing. Contrary to what I thought when I first tried APF, I now use it most of the time, but I hasten to add that "most of the time" I'm listening to very weak signals (e.g. 160m DX or QRP SOTA ops on higher bands). When I activate SOTA summits, I *REALLY* miss APF on my K2 and this feature alone may eventually push me over the edge to a KX3. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/CW-Pitch-Resolution-tp7579837p7580141.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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
