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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