[Elecraft] Difference in DSP in K2 and K3S

[Don Wilhelm]

Paul,

Comparing the technical side of the K2 DSP NR with the K3 NR is like 
comparing apples and oranges.
The KDSP2 is DSP added at audio, while the K3 NR is done at the 15kHz IF.
The K3 offers many more settings that are available with the K2 DSP, so 
I encourage you to experiment some more.

The way the NR algorithm works is that the DSP searches for what it 
believes to be a correlated signal and builds a filter around that 
signal.  That may result in the 'robotic' voices that you mention.

Not all noises are the same, and you may have to find the settings that 
deal most effectively with your particular noise - as I indicated, 
experimentation may be necessary.  You should look at the manual page 
dealing with "Reducing Interference and Noise" for some clues and 
cautions about NR.  Check to see if Noise Blanking might be more 
effective than NR for the type of noise you are dealing with.  A 
combination of the two can also be used if that should help.

73,
Don W3FPR

On 6/7/2016 5:16 PM, Paul Wilton wrote:
> I have been using a K3S in a 2m SSB VHF contest this evening and find that the DSP NR is a bit a disappointment compared with my usual K2 rig.  My QTH has a fair degree on man-made noise so on the K2, I normally run with the NR at level 4 (factory settings - I haven’t adjusted them).  However, when using the NR on the K3S this evening, when I adjusted it to get a similar amount of noise reduction, I find that is accompanied by a lot of swooshing noise modulated with an interval of between 0.5 to 3seconds.  Also, the voices seem a lot more robotic and harder to understand.
>
> I did try all of the NR settings but didn’t really find one which matched the niceness of the K2.  Has anyone else progressed from a K2 to a K3 on VHF and would like to comment on the effectiveness of the NR?  And more importantly, are there some settings I can try to get the K3S to sound like my K2?
>