KDSP2-settings for CW use

[Karsten Eppert (DK4AS)]

Hi folks,
has anybody experimented with the noise reduction of the KDSP2 for cw?
Are there any optimum settings that one should use or are the factory
settings already optimum. Up to now I´m not very much pleased with this
particular feature, while the others are very helpful. Possibly I´m just
using it wrong.
73
Karsten
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[n6wg]

Karsten
To use the NR function on cw, you need to open up the filters.
The narrower the filters, whether IF or audio, the more noise
pulses are stretched, and "white" noise begins to sound like
signal.  Both cases reduce the effectiveness of the NR function.

I find that I get the best results with the IF filter set around 500 Hz
bandwidth, and the same for the DSP filter.  This gives the NR
function a chance to work.

So you have a tradeoff between NR versus selectivity.  You have to
experiment under any given conditions to see which gives you the
best results.

Good luck and 73
Bob N6WG

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Karsten
Eppert(DK4AS)
Sent: Wednesday, November 23, 2005 11:51 AM
To: [hidden email]
Subject: [Elecraft] KDSP2-settings for CW use


Hi folks,
has anybody experimented with the noise reduction of the KDSP2 for cw?
Are there any optimum settings that one should use or are the factory
settings already optimum. Up to now I´m not very much pleased with this
particular feature, while the others are very helpful. Possibly I´m just
using it wrong.
73
Karsten
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[Bob Nielsen]

On Nov 23, 2005, at 12:24 PM, Robert Tellefsen wrote:

> Karsten
> To use the NR function on cw, you need to open up the filters.
> The narrower the filters, whether IF or audio, the more noise
> pulses are stretched, and "white" noise begins to sound like
> signal.  Both cases reduce the effectiveness of the NR function.
>
> I find that I get the best results with the IF filter set around  
> 500 Hz
> bandwidth, and the same for the DSP filter.  This gives the NR
> function a chance to work.
>
> So you have a tradeoff between NR versus selectivity.  You have to
> experiment under any given conditions to see which gives you the
> best results.

For those who think this might be a bad tradeoff, remember that  
(thanks to Mr. Boltzmann) the noise power is proportional to  
bandwidth, while the signal power will be generally independent of  
bandwidth.   Therefore, the need for noise reduction is less with  
narrower bandwidths.

73, Bob N7XY


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