I was experiencing noise on 20m CW which the DSP NB (setting 3-7) could eliminate, but the hardware noise blanker couldn't tackle. The DSP NB could eliminate the noise with my 1 KHz roofing filter selected, but as soon as I reduced the DSP filter width to the point where the 400Hz roofing filter was automatically selected, the noise came back.
It would seem from the above that the DSP NB works well when using narrow DSP filter widths i.e. 450Hz - 1KHz under a wide roofing filter (1KHz or greater), but not when a narrow roofing filter is selected i.e. 400Hz. There has also been some discussion on this reflector about DSP NR not working at narrow filter settings and I was wondering if this is because of the automatic selection of narrow roofing filters rather than DSP filter width? Would it make sense to have an option in firmware to select between automatic and manual selection of roofing filters? This would allow a wide roofing filter to be selected i.e. 1KHz or greater when DSP NB is required, coupled with a much narrower DSP filter width i.e. 200Hz, to help with crowded band conditions. I know that this is possible by using the Elecraft filter configuration utility to ignore installed narrow roofing filter options, but I feel this is unworkable for every day operation/conditions. Doug K3 #1293 K2 #4688 -- View this message in context: http://n2.nabble.com/K3-Automatic-Manual-Roofing-Filter-selection-option-in-Firmware--tp1569054p1569054.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
