NB - DSP/IF

[Jim - W6VAR]

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?

Jim - W6VAR

[M0XDF]

I have to say, I haven't been able to tell a great deal of difference,  
but I think that is because I don't have that kind of noise at my QTH.
I do find NR works really well though :-)
73 de M0XDF, K3 #174
--
Always remember, half the people in the world are above average  
intelligence!

On 14 Oct 2008, at 06:31, 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).

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[Don Wilhelm-4]

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?
>  
>
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