wrote
Regarding ringing, the sharper the filter, the more it rings. You
can't fight physics. I really annoys me how people think digital is
the solution to everything without really understanding the nuances.

You have obviously never worked a top line radio like the Icom IC-756
PRO III on CW with a narrow DSP filter. I assure you that even as
narrow as 50 hertz
THERE IS NO RINGING
If you don't believe me I am quite prepared to e-mail anyone an MP3
recording of the 50 Hertz filter working a beacon.

I also have many DX mates who work CW beacons and use Timewave DSP
filters right down to 8 hertz and I have never heard them complain of
ringing.

John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
Antenna's RF Systems DX 1 Pro Mk II, Datong AD-270
Kiwa MW Loop, PAORDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx