[1000mp] Narrow ssb filters (was 500Hz vs 400Hz filters)

[Barry N1EU]

N3DRK commented "The thing I would be concerned about Dave is a station 
close by while you are at 400 Hz and the signal start pumping your agc. In 
that case I dont think the edsp at 120 or even 60 would help. That is when 
the 250 hz would come in."

AGC pumping could be eliminated by using the shift and width controls with 
the 500/400hz filter pair.  The 250hz filter pair are certainly nice to 
have, but not absolutely necessary in this case.  It pays to be proficient 
with the shift/width controls in a variety of qrm circumstances.  Using the 
1.8khz pair, I often will take the bandwith down even further in crowded ssb 
contests with shift/width.

73,
Barry N1EU

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