[Elecraft] K3S Filter Shape Factor

[Frederick Dwight]

          Several times over the last 5 years INRAD has offered 700 Hz filters for the k3/K3S.  For casual CW operation
something  like a BW of around 700 Hz is often just about ideal.  I equipped my K3S with this filter and do use it
from time to time. Something like a 400 Hz or 250 Hz filter is still required for very tough situations.  The DSP filtering
does such a good job with my 400 Hz or SSB filter, that I do not consider my 700 Hz filter a necessity, although
some CW folks may still want to consider this.  Probably something like the 500 Hz filter with the 3.1 shape factor
would be a good alternate solution, however you may still want a sharp filter for very tough situations.

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