Helix 7 MSI not reading over 8-10mph

[Wayne P.]

So I had a Helix 7 G2 SI at the console with transom mount transducer and a Helix 5 G2 SI on Bow with TM transducer. I recently upgraded to 2 Helix 7 G3N MSI at the console and now and have them connected through an Ethernet hub. The original setup would read fine on 2D sonar while underway but my new setup doesn’t read depth or show sonar once I get over about 8-10mph. The frequency was set to narrow and I just put it on full to try my next time out. And Yes I have the “XNT 9 HW MSI 150 T” which is supposed to be the “high speed” transducer. Any suggestions on why I’m not getting any depth or sonar imaging?

What boat do you have? Post a picture of the transom transducer installation.