http://elecraft.85.s1.nabble.com/DSP-XTAL-filter-settings-tp389470p389473.html
My preference is to use the 700 Hz xtal filter and then narrow down the bandwidth with the DSP filters when necessary.
>
> Hello All,
>
> I just added the DSP processor to my K2 and adjusted both the DSP and
> XTAL filters to the same center frequency using Spectrogram. The DSP and XTAL
> filters work fine together, except that when using the default filter settings,
> the DSP and XTAL filters essentially duplicate each other and it's not obvious
> what the best combination of filter settings should be and how the XTAL and DSP
> filters should be used in combination, particularly for SSB.
>
> I found a posting from Tom Hammond from January in which he recommends
> that for CW, because of the signal loss of the XTAL filters below 200Hz, use the
> DSP filters below 200 Hz. and the XTAL filters above 200 Hz. Thus, it seems that
> I should set the CW DSP filters to something like 200 Hz, 100 Hz, 50 Hz and
> LOPASS, and the XTAL CW filters to something like 1.5 kHz, 1.0 kHz, 700 Hz and
> 400 Hz. Then, when I want the wider bandwidth, I'd use one of the XTAL filters
> with the DSP filter set to LOPASS, and when I want the narrower bandwidth, I'd
> use one of the DSP filters (and since the XTAL filters all would have wider
> bandwidths, it wouldn't make any difference which XTAL filter is selected).
>
> That seems like a reasonable approach to the DSP and XTAL filter
> settings and combinations on CW. (Comments?)
>
> However, I have no idea how to set up the DSP and XTAL filters and what
> filter combinations to use for SSB. It seems to be a waste of the K2
> capabilities just to have the DSP and XTAL SSB filters essentially duplicate
> each other, as their default settings seem to do. So, is there some optimum way
> to setup the DSP and XTAL filters and use them in combination for SSB that makes
> best use of the K2 capabilities?
>
> Thanks for any advice and suggestions that you can give me.
>
>
> Bob Solosko
> W1SRB
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