Dear All I am looking at PSK31 signals not SSB and my definition of distortion is my visual observation on the PC waterfall in DM780 and the fact that decode of the signal by the PC starts to fail when I engage the narrow filters. This is observed when I have clean signals using the 2.1 or 2.7 filters and only DSP. I do understand the how strong signals can create havoc in the band which is why I have the narrow filters. The issue is until I get them setup to work well without interference I will not expect them to help much when I have close signals or weak signals that I want to pull out.
I do have all the offsets per the documentation with the filters so this should not be the issue. Folks have pointed to some articles regarding the setting of the filter gain and have privided insight on how to use information on the K3 display to help quantify signals. My biggest problem is I have zero results when I do searches on these types of topics. One of the responses was a link directly to a writeup that I had been searching for, go figure. :-) All I know for sure is that again the user community has helped me get to the info I needed and now I have a basis of logic on what I will be looking at when I make some adjustments. Now I need to get in front of the radio and follow the advice of the wise ones. Thanks Everyone!!! Don KD8NNU On Sat, May 28, 2011 at 3:17 PM, gold...@charter.net wrote: > Gents, > > I am searching without much luck for recommendations for the gain > setting recommendations for roofing filters. > > Specfically I have a 700 hz 8 pole and a 200 hz filter 5 pole. There > is a gain setting in the k3 setup menue and I remember there were > recomendations on how to choose this setting. However, I have not > been able to find reference on the net. > > Please can anyone provide some guidance as the performance when these > filters are engaged with digital modes is rather disapointing. What > I mean by this is that a signal can be very clean with the 2.7 or 2.1 > filter engaged but if I use on of these filters the signal becomes > very poor. I want to use these to isolate close in signals but there > appears to be a lot of distortation so they are basically of little > use. > > I am betting that there is more to this gain setting than meets the > eye and that is where my problem is. I have put the gain for these > two filters at 1 and the 2.1 & 2.7 at zero. > > I will be playing around with the settings, but there is a method to > set this parameter so I need to learn what and why so I can make them > work the way they are supposed to work. > > Thanks and have a great holiday. > > Don > KD8NNU > ______________________________________________________________ > 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
