[Elecraft] What should I be hearing when I use the K3 Noise Filter?

[ka9zap]

Hi Robin
The last firmware NR was a bit on the to aggressive side making 
everything sound like it was
coming through a pipe or hollow sounding I found my self not using it 
often to fatiguing over
time to listen to.
This revised NR is a bit on the other side of the spectrum while the 
finish product is not
hollow sounding it does not offer a lot of reduction.

Could be the code writers are "range finding" shooting long then short 
to zero in nirvana
as a cw first operator who is not afraid to go very narrow on the 
filters I do not find myself
using the NR a lot the suttle influence is closer to my liking then the 
to agressive aproach.
So might it be nice to have both in the next release the 1-4 2-4 could 
be like but with a bit
of tweaking for more Reduction of Noise but not to much and then the 3-4 
4-4 come back in
from the other side of to much NR where it was hollow through a pipe 
response

Robin Diane Goldstein wrote:
> hi all...  elecraft/k3 newbie here (new owner of gently-cared-for 
> #2102)...  have read everything i can find, but can't dig up an 
> answer, so this is my first post to the list:
>
> i've downloaded the latest beta firmware and have read all the posts 
> reciting joy and jubilation (my words) in connection with the 
> operation of the Noise Filter... but i think i'm missing something... 
> i work almost exclusively SSB and find that i'm listening to stations 
> buried in the QRN...  i -thought- this was where the Noise Filter was 
> suppose to help, but when i turn on the NF and adjust it from 1-1 to 
> 4-4 i seem to hear a somewhat filtered/somewhat distorted version of 
> the input signal.  i understand that the filter works automagically, 
> but as i go from X-1 to X-4 it sounds like some kind of notch filter 
> is being applied in increasing amounts, but not in a 
> meaningful/useful way...  then it goes from X-4 to Y-1 and the 
> narrowing 'hiss' starts all over again, this time with a slightly 
> harmonic distortion.
>
> on very strong signals i can sometimes find a setting (usually 3-2 or 
> 3-3) that sharpens up the audio just a bit, but those signals usually 
> are loud enough to blast through the noise anyway... what i'm looking 
> for is help with the S2-S3 stuff.
>
> any advice or perhaps a pointer to an audio/video file showing the 
> filter in (proper) operation?
>
> btw, the NB seems to work just fine as does the notch filter.
>
> many thanks and 73!
> robin (K9RDG)
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