This is a pic is from my 1197 off my trolling motor transducer. The trolling motor wasn't spinning when pic was taken. The motor is a minn kota maxum 65. When I switch the 1197 with my 998 at the console it has a great image but the 998 will have theses lines. I've done all of the steps to eliminate interference. Could this be a bad transducer? thanks for advice.