I have found that having roofing filters automatically track the DSP filter width is a bad idea in a noisy environment. My noise was best tackled with the DSP NB rather than the hardware NB (ie. DSP NB 3-7, IF OFF).
The DSP NB still worked with a 1KHz roofing filter in line, but if a narrower roofing filter was selected (400Hz) as a result of reducing the DSP filter width, the DSP NB action vanished, and I was left with the same horrible audio as you are describing. I don't understand the full picture yet, but, DSP NB and NR need a wide roofing filter width (>= 1KHz) to work effectively. However, any narrow DSP filter width (as long as a wide roofing filter was selected) would still still allow DSP NB and NR to work effectively (ie. roofing filter 1KHz, dsp filter 200Hz). The automatic selection of roofing filters makes this combination and many others impossible to select (e.g. if you have a 400Hz roofing filter installed) without messing about with the Elecraft Utility software and disabling filters. My previous post suggested having a menu item that would allow the automatic/manual selection of roofing filters (defaulted to Automatic) to allow for better handling of selectivity in noisy situations. Doug GM0ELP -- View this message in context: http://n2.nabble.com/-K3%7D-fatiguing-auido%2C-high-noise-environment-tp1650872p1651490.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
