RF/TM noise interference improvment (597ci HD DI)

[Dutch]

Last week I was informed of RF/TM noise on screen shots of my new 597ci. Here's waht I was seeing at trolling speed .8-1.0....
..

After doing some research I rerouted the transducer wire away from the coiled power wire and installed a pair chokes on the TM power cord. Here was the result...(setting were 9 sensitivity, 9 contrast with surface clutter set to 1, noise filter set to high1).
Not quite what I wanted but I could live with it if neccessary. But I continued to reasearch the subject.
RF Chokes installed....

Today I twisted a 18 gauge wire around the transducer wire and spliced it into the negative wire on the sonar unit (tried the neg. wire on the TM power with no results) and anchored it to the clamp on the TM motor. Here is the result...(sensitivity set to 12 (14 was clear as well), contrast 10, surface clutter 5, and noise filter off)....

Still needs some tweaking on sharpness and whatnot, but as can be seen there is very little RF/TM noise showing on the unit while the TM is running at trolling speeds. Need less to say I am very happy now.

The fix....