I have the 250Hz - it is *very* sharp! Simon Brown, HB9DRV www.ham-radio-deluxe.com ----- Original Message ----- From: "Terry" <terry at kk6t.com> > I'm considering purchasing a K3. Which filter do I want for RTTY (both > DX & contesting)? 200 Hz 5-pole or 250 Hz 8-pole? Or is there some > other configuration I should consider?