[Elecraft] NB - DSP/IF

[Don Wilhelm]

Jim,

The effectiveness of the NB and NR will depend on the type of noise you 
encounter - that is why the K3 implements both.
The NB works best on impulse type noise.  It will have little effect on 
noise that makes more of a 'frying bacon' sound.  The way it works is to 
detect the noise early in the receiver and then blank out a later 
receiver stage so the noise pulse is not heard.
The NR works well on that 'frying' sound.  In the K3, NR is implemented 
as a "signal enhancement" function, rather than reducing the noise, it 
looks for patterns that would be found in a real signal and passes those 
along while rejecting the rest.  If I recall the proper term is 'signal 
correlation'.

73,
Don W3FPR

Jim - W6VAR wrote:
> I've had my K3 for about a month now and the NR seems to work very well.
> However, I have had little luck with either the DSP or IF NB when I hear
> what sounds like electrical noise. There does not appear to be significant
> differences between any of the settings and I don't detect an appreciable
> differrence in audio (which I would at higher levels of DSP). 
>
> Thoughts?
>   
>