[Elecraft] K-3 Noise Reduction

[Bill W4ZV]

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


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