I have LSI. Lawn sprinkler interference. Next door neighbor's lawn sprinklers chatter with 100-200w out on HF. I was able to solve the problem on 10m by putting ferrite on the power cord of the control unit but still causing a "problem" on 40M. More ferrite? Buy him a new controller? Dick W7ZR Price Reduced!! Beach Vacation or Retirement Home Visit www.w7zr.com for details