I wish I had a 700 Hz filter because I like the DSP in the 400-700 region. My reason for this is that when a narrower filter is in use, it tends to have many signals with about the same tone. At least for my hearing, I need and like to have a spectra of audio signals. Sometimes I get the lower tone ones and sometimes the higher ones. Also, notwithstanding the "reverse beacon" phenomenon, there are usually callers who are off frequency enough that a narrow filter will miss them. Incidentally, some of us suspect the reverse beacon spots are not the issue that people think. We observed the pileups got much bigger when clusters spots showed up. We suspect the RBN spots are used by contesters and general dxers are still using and favoring the DX clusters.
Fred Cady fcady at ieee dot org > -----Original Message----- > From: elecraft-boun...@mailman.qth.net [mailto:elecraft- > boun...@mailman.qth.net] On Behalf Of Peter Wollan > Sent: Monday, December 05, 2011 11:45 AM > To: Elecraft Reflector > Subject: Re: [Elecraft] K3 hardware AGC experiment shows promise (& > KE7Xconfig) > > Fred's configuration struck me as quite surprising. With DSP at > 5-700, his K3 would be using the 1000 kHz roofing filter, so there > would be a substantial frequency range blocked only by the DSP. And > ATT on -- why would this be attractive? I'd think to hear weak > signals close together, you'd turn off ATT, turn up RF gain, and > squeeze down to a narrow roofing filter. Wouldn't that make the > signals sharper and more legible? > > I wonder if this choice of operating settings is the reason not > everyone hears the mushy effect. > > Peter W0LLN > > > On Mon, Dec 5, 2011 at 7:09 AM, Cady, Fred <fc...@ece.montana.edu> > wrote: > > > When operating, ATT is ALWAYS ON. I don't think I ever took it off > > except maybe when 15 was dead. PRE never on. > > > > > I have 250, 400, 1000 and 2.7 kHz filters. > > > > DSP _usually_ in the 500 - 700 range, sometimes a little wider, > > sometimes a little narrower. I don't think I ever went below 300 Hz. > ______________________________________________________________ > 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
