Posted by Bruce Beford-2 on URL: http://elecraft.85.s1.nabble.com/Question-about-K1-tp5613295p5613451.html
David,
You can only have one filter board in the K1 at a time.
My 4 band board is for 40m/30m/20m and 15m.
I have a 2 band board I swap in for 160m and 80m.