A blessed Christmas to you, Mark. Have a look on p46ff of the on-line K3 owner's manual for all that filter setup info. Brgds, Dave, N3HE -- View this message in context: http://elecraft.365791.n2.nabble.com/250-Hz-Cw-Filter-Setup-tp7121456p7124689.html Sent from the Elecraft mailing list archive at Nabble.com.