[Elecraft] KDSP2 - artifact

[Lyle Johnson]

Hello Johnny!

> I experienced exactly the same in the recent CQww SSb contest.  I really 
> want to know how I should adjust the beta and decay time to minimise the 
> artifact.  I don't mind having much less aggressiveness in NR during SSB 
> operation.
> 
> In some extreme situation during the contest, I simply turned off the KDSP2
> 
> Could any of you in the list point me to the right direction?

I suggest you tune in a typical signal and change Beta from 99 to 00 and
back again.  This will give you a good idea of what Beta does.  Then do
the same for Decay, changing between 99 and 00.

Please also read the Design Notes article about the KDSP2 <
http://www.elecraft.com/KDSP2/kdsp2design.pdf >. It explains the
techniques used and the limitations of the DSP noise reduction system.

There is not "best" setting of the noise reduction system.  The defaults
are a reasonable compromise based on input from the field test team.

Hearing and sound preferences are different each individual.  What is
acceptable to me may be very annoying to you, and vice versa.

As signals get weak, they become more like noise and are harder for the
DSP to separate, just like it is harder for you to separate.  Noise
reduction will have the best chance to work if the signals are moderate
and the bandwidth is wide.  Weak CW signals will come through the noise
reduction system much better than weak voice signals.

I believe that within its limitations, the DSP system does a very good
job.  But it cannot do miracles :-)

So, please experiment with the settings, and understand the limitations
of the system.

73,

Lyle KK7P