[Elecraft] K3 Filter Ring with Noise?

[Lyle Johnson]

The K3 offers IIR and FIR filters for the narrowest bandwidths (100 Hz 
and 50 Hz).

IIR may have some amount ringing.  The disable IIR, go to CONFIG:FLx ON 
(or any other filter menu) and tap "7" on the keypad until you see IIR OFF.

The K3 uses fairly aggressive skirts on its filters.  We have talked 
about implementing a "soft slope" which would make heavily filtered 
noise a bit broader, but that has implications on dynamic range and 
other issues that keep it from getting near the top of the list.

73,

Lyle KK7P