I just got back to the "Frost Fest" and played with a K3 I'm 95% sure I'm going buy a K3. I want to start and build. I have to start with the K3/100 as 10 watts won't drive my amp. I have a SteppIR so the tuner isn't needed. My question what is the minimum filters. I don't do CW, I do RTTY contests and voice contests. Thanks 73 Larry K1ZW/4 Durham, NC