Edward R. Cole wrote: > > Let me ask a filter question for a different situation. I am > interested in receiving very-weak CW and currently have the 2.8 KHz > and 400-Hz 8-pole filters. Will narrowing the DSP bw down to 200-Hz > work as well as using a 200-Hz filter? There are no strong stations > either nearby or on the band. >
There would be no advantage to a 200 Hz XFIL in that case...but you may not want to go that narrow. I prefer a wider bandwidth (350-400 Hz) for extremely weak signals in white noise (no QRM!). I believe the human ear does a better job of discriminating signals from white noise if it has some bandwidth to work with. APF also works better for me if used with wider bandwidths for the same reasons. The 200 Hz XFIL is mainly useful for extreme QRM situations...like the CQ 160. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/adding-250Hz-filer-any-improvement-tp6004879p6007288.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
