Eagle 480 RFI

Attachment 86420

This is my new Eagle 480 sitting on the bow of the boat. You can see the ugliness on the screen.

Transducer is on the trolling motor.

When I took this picture all leads to all batteries were disconnected except for the power wires spliced into the power cord of the finder (at the bow) from there - 16’ feet of 16 gauge twisted pair is running to the cranking battery at the back.

As a test, I picked up the finder and the transducer cable and stood as far away from the boat as possible and still got this interference in the picture. I was getting 12.5 V at the splice up at the bow. No idea how I’m getting interference with only the finder plugged into a battery that’s 16’+ away. Also ferrite cores at the power going into the finder.

Thoughts or test to run?

possibly a nick in the wire insulation somewhere between front to back? Are the DF power wires running anywhere close to power wires for the TM ??

I don't think that is interference. It looks more like a bad unit. Do you get the correct display in simulation mode?
Sonar Simulator
This unit has a built-in simulator that lets you run it as if you were on
the water. All sonar features and functions are useable. When in
simulator mode, you will see [Simulator Mode] in the Sonar Page title
bar. To use the simulator:
1. From the Sonar Page, press
MENU|MENU|↓ to SONAR SIMULATOR|ENT.
2. Turn off Sonar Simulator by pressing
MENU|MENU|↓ to SONAR
SIMULATOR
|ENT|EXIT.

I agree with Bill. That looks like the unit is on auto trying to find bottom and not seeing it.

That could be it. That bottom it was trying to find would be my barn's wood floor. :dono

(I've done my homework studying the RFI sticky threads, but like I said all other power sources are disconnected.)

I'll try out the suggestions you all have made. I'm grateful for your help.