[Elecraft] Dual PB filter

[alsopb]

Anybody out there playing with this feature or actually used it in a contest?  
What are your experiences?

Playing with it yielded the following:.

1) Narrower CW filters can't be used (at least not my 400 Hz and narrower
filters).  The wings are outside the narrow filter passband.
2) For me that meant the 1.8KHz roofing filter was used.

It seems like that defeats the purpose of having a K3.  In a contest
situation, I would certainly like as many rock crusher signal outside the
roofing filter passband as possible.

It would suggest one might consider the 1 KHz roofing filter, if you want to
seriously use this option.

If there existed some intermediate (say 700Hz) or variable roofing filter, 
what would it's width have to be to include the wings and be used for dual
PB filtering?

de Brian/K3KO
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