KK7P wrote: > > In the end, NR is a filter, and like any filter it will affect what is > being passed through it. The weaker the signal, the more it appears > like noise and the harder it is to separate the two. >
This is why some of us use a relatively wide DSP filter (4-500 Hz) when listening to ultra weak CW signals...so our brain's DSP can do a better job of separating the signal from noise. If you have an extremely narrow DSP filter (either set by WIDTH or NR), noise going through that filter can cause ringing which interferes with the signal. Some of you may have noticed the same effect with APF. I never use NR because it's essentially doing doing the same thing as reducing WIDTH. However I do find APF can help in some cases (again with a fairly wide WIDTH setting) but it appears to be more effective in impulsive noise (i.e. lightning induced) rather than white noise (i.e. galactic noise). That's the opposite of what I expected but that's how it works for me. As Lyle said: > Finally, NR is part of a general field of psychoacoustics. What some people like, others barely tolerate. Somewhat like tastes in music... Each must experiment to see what works best for your own brain/ears. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/K-3-Noise-Reduction-tp6368789p6372816.html Sent from the Elecraft 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
