The noise on different bands has different sources and different characteristics. Noise at lower frequencies is generally non-stationary (a statistical measure) which makes it harder to remove.
I don't know why it would behave differently with the preamp on or off. wunder K6WRU On Mar 20, 2013, at 4:35 PM, Ed Ketterer wrote: > All, > > Posted this a couple of weeks ago. Still looking for some thoughts on it... > > The effect of the NR (DSP) feature on my KX3 appears to vary with the band I > am on. On 80m and 40m, NR significantly reduces noise when the preamp is > off, but has little effect when the preamp is on. On 30m and 20m, there > might be a bit more noise reduction provided when the preamp is on, but > again, the effect is much more dramatic when it's off. On 17m and above, I > get very effective noise reduction regardless of whether the preamp is on or > off. It would be nice if the NR feature provided similar noise reduction > across all bands regardless of whether the preamp is on or off, and for me I > would certainly like to see significant noise reduction on 40 and 20 with > the preamp on. I have made no changes to the locked NR setting in the menu, > and am running the latest firmware. Has anyone else experienced this? Any > ideas on how to make the performance more consistent across bands? > > Ed, K8SZN > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- Walter Underwood [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
