I find the best thing for phone contesting is a ton of attenuation and judicious use of RF Gain, combined with narrow bandwidth. No way to get rid of the low-frequency rumble from within the passband, but the combination of the roofing filter, DSP high cut and shift/width will get rid of the high-pitched adjacent noise enough to be reasonably efficient. I still don't like SSB contests, but they're far more survivable with a loaded K3s than they were with previous radios!
--------------------------------------------- GO FRC! Peter, W2IRT www.facebook.com/W2IRT -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill Stravinsky via Elecraft Sent: Monday, August 27, 2018 1:35 AM To: Elecraft Reflector Subject: Re: [Elecraft] Filter Recommendations I opted for a 2.1 ssb filter hoping to be able to enjoy phone contesting just a little bit more but so far I haven't found the magic elixir for phone.I only replied to the post after seeing "information garbling" from Don. That is exactly what happens to me with whatever filter or passbandsetting I have tried in my K3 during a phone contest. Btw, that is during major DX contests, I can handle the smaller ones but normally don't, hi. BillK3WJV On Sunday, August 26, 2018, 9:53:41 AM EDT, Don Wilhelm <donw...@embarqmail.com> wrote: Lee, The 2.8kHz filter has a flatter passband and steeper skirts than the 2.7kHz. But remember that this is a roofing filter, the DSP provides the actual filtering for the K3/K3S. The purpose of the roofing filter is to keep strong adjacent signals from overloading the Hardware AGC and the ADC at the input to the DSP circuits. A strong signal that is inside the passband of the roofing filter, but outside the passband of the DSP filter (you may not hear that signal since it is outside the DSP filter) can cause receiver AGC "pumping" and in extreme cases can overload the ADC causing severe "information garbling". 73, Don W3FPR On 8/26/2018 8:45 AM, Lee Murrah via Elecraft wrote: > I am looking to upgrade my K3S with filters and am using the DX version of > the radio as a guide. What is the advantage of the 2.8 KHz filter over the > stock 2.7? What does the 2.1 KHz filter do for you? > ______________________________________________________________ > 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 > Message delivered to donw...@embarqmail.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 Message delivered to k3...@yahoo.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 Message delivered to li...@w2irt.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
