Changed the feedline to the vertical dipole from 18ga ladder line to 14ga and tested the system...all works fine except on 15m cw with K3s/KPA500/KAT500 as usual. Barefoot, no msg, but with K3s providing 23w of drive to get 500w out, I get an intermittent ERR KP1. Dont see this code in the manual. Any ideas or suggestions? 73 Tom HP1XT