[Elecraft] 2.1 kHz filter - K3

[Bob - W0GI]

I am using the 1500hz Inrad. As mentioned, you have to use the shift to make
it work for SSB.

It is only needed for extreme close-in QRM, as I find the 2.7khz filter
along with the DSP is fine for everything else.

I rarely have needed the 1500 for SSB, but I like it for wide CW tuning.

The K3 DSP is pretty good, and you may be wasting your money adding a 2.1,
1.8, or 1.5 unless you run into really strong close-in signals. I rarely do
on SSB.
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