I was experiencing terrible RF interference between my Terrova with US2 and two different greyscale HB units-a 718 and a 570. I ran #6 wire to the TM and had it mounted as far away from my sonar cables as possible. I added the HB choke on the recommendation of the HB customer care center-no go. I also purchased 4 additional ferrite cores and placed them in series on the HB power cord as close to the unit as possible-no go. I still had interference issues that made the unit useless most of the time on the water, as all but the top 5-10 feet of water were completely blacked out. I was about to sell the Terrova on Craislist and deciced to try one more thing. I installed a Lowrance x135 unit up front and connected it to the US2 and no interference. I have fished it for the last 2 months from water depths of 3'-88' with no RF interference whatsoever.

I'm not making this out to be a HB vs Lowrance thread as I have always been a dedicated HB customer and have an 898 on the console. I just wanted to give others hope and explain the way that I ultimately got rid of the interference and still get to use the awesome features of the Terrova.