[Elecraft] K3S DSP filter plots

[Don Wilhelm]

Charles,

Getting a plot is not difficult to do.  Just connect an audio spectrum 
analyzer such as Spectrogram or SpectrumLab to the audio output of the 
K3 and feed the antenna input with a broadband noise generator.
I use that technique most every day when aligning the IF filters on K2s 
- quick and easy.

No I do not have any saved plots.

73,
Don W3FPR

On 11/16/2015 10:59 AM, charles at k5ua.com wrote:
>   
>
> Thanks for the reply Joe.
>
> I'm hoping that the constant slope you described is not the way the DSP
> filters are implemented, because that would mean the 50hz filter has a
> 5.625:1 shape factor, the the 100hz filter has a 5:1 shape factor, the
> 200 hz filter has a 3:1 shape factor and the 400hz filter would have a
> 2:1 shape factor. To achieve better than 2:1 shape factor at 30dB per
> 100hz, the width of the DSP filter would need to exceed 400hz.
>
> I wonder if anyone has put their K3 or K3S in the 1 hz tuning mode with
> a signal generator and ploted out the approximate response curves using
> the S meter. It's a rather crude way to do it, but in the absence of
> more accurate test gear it will give some idea of the shape factor of
> the DSP filters.
>
> I will be ordering a K3S today and will ask Elecraft if they have plots
> for the 50, 100, 150, and 200 hz DSP filters. If not, I will get the
> little signal generator and report my findings on the reflector.
>
> If anyone reading this thread has plotted out the 50, 100, 150, or 200
> hz DSP filter response curves, please let me know.
>
>