[Elecraft] K3 Noise Reduction question

[Don Wilhelm]

Fred,

Perhaps an explanation of how NR works will help you understand what you 
are hearing a bit better.  The NR algorithm looks for some sequence that 
it can define as a signal, and then builds a filter around it.  The type 
of filter is determined by the parameters you have set.

That is why you have found there is no need for NR when using CW with 
narrow filters.  On SSB, yes, some settings can sound "pretty ratty".  
Enough so that I do not use it on SSB.  But do give some of the settings 
above 4-4 a try - those use a different algorithm and may be worthwhile 
when needed.

73,
Don W3FPR

On 4/27/2012 4:58 PM, Fred Jensen wrote:
> I operate mainly CW and while the NB is very effective for me on CW,
> I've never seen much advantage to the NR at narrow CW bandwidths.  I had
> occasion to be on SSB this week attempting to work several SOTA summit
> activations, and tried the NR.  At the wider SSB BW, it made a great
> difference.
>
> With NR however, even at F1-1 [which I think means least aggressive],
> while the nasty line noise really fell, the SSB signal acquired a
> profound echo which made it very hard to understand.  I'm running FW4.39
> and whatever DSP came with it.  Is this reverberation [it's more like
> that than a distinct echo, like talking through a long pipe] normal?
> The further "up" the NR scale I went, the more pronounced it got, and
> beyond F1-4, the signal was indecipherable.
>
> Full Disclosure:  My hearing sucks and has since one night in 1965 on
> the other side of the planet, so me telling you what something sounds
> like can be somewhat of a joke.  I can't use my hearing aids under my
> headphones, so I run the AF gain high ["afterburner roar" or close], but
> the reverb effect definitely is controlled by the NR.
>
> 73,
>