[Elecraft] K3S Filter Shape Factor

[Robert Sands]

I thought the shape factor of the 2.8kHz filter was 1.5 to 1 which is
impressive up front with good deep out of band pass rejection in excess of
70 dB. The DSP adds the final shaping to the signal that exceeds the
roofing filter spec and is therefore the most effective source of final
rejection. One observation I have made is that the DSP efficiency is better
when I use the 2.1 or 1.8 roofing filters which suggests that the
selectivity of the roofing filters is worth quite a bit in the mix. Is this
a fair analysis? MD here not EE.
Bob
K7VO

On Wed, Mar 20, 2019, 3:19 PM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Tony,
>
> The filter shape factor is not stated, but there are filter plots on the
> Elecraft website.
>
> The filer shape factor for the roofing filters is not critical as it is
> in an analog receiver.  In the K3/K3S, the final filter shape and shape
> factor is determined by the DSP filters which follow - the DSP filters
> have a very steep slope.
>
> 73,
> Don W3FPR
>
> On 3/20/2019 6:09 PM, ab2cj wrote:
> > All:
> >
> > Where can one find filter shape factor specifications for Elecraft K3S
> > filters?
> >
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