[Elecraft] K3 LPF add-on filter

[David Windisch]

Hi, all concerned:

I wrote the mother ship about the following several weeks ago, in ignorance
of efforts on the firmware APF.  I didn't hear anything back, which is just
as well, cuz I like the firmware version as much, or better, than anything
I've cobbled up <g>.

In any case, if you download the K3 LPF add-on filter manual and study the
schematic, you can experiment with your own low-level active or passive APFs
using the cuts as in and out, if you choose.  Just bring the connections out
of the radio in shielded cable.  I use designs from an ancient TI app note:
"Application Report SLOA058– November 2000" whic I found on line while
googling "state variable filter".  I like SV filters cuz you get
hi/lo/allpass-notch-peak functions from the same circuitry.

Remember, ymmv.  I am interested in the operational contrast between the
analog and digital worlds, and this is a relatively easy comparison.  I opte
for the factory lpf mostly to avoid YA box on the table.

Brgds,
Dave, N3HE
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