Double return on TZ-touch3 & Chirp & Airmar B275LHW Transducer

[ELGATODOS]

We are running a 19" TZ touch 3 using it's built in fish finder connected to a B275LHW. We are getting a second return of the bottom as you can see in the pictures. We also have the DFF-3D running and it does not show multiple returns, it looks normal. Both are in "Auto". When I switch the Chirp to "Manual" I can adjust the depth to put the single bottom return toward the bottom part of the screen to create a nice normal screen. What are we doing wrong? I'd like to "auto" setting to not show the double return.
First picture is 275, second is DFF3D

 

[gtstang462002]

Go into your sounder settings and adjust your bottom range shift area until you get the picture that you like. For reference, I have mine running at 80.

 

[FishTech]

When you get into a little deeper water the second bottom echo should go away. The initial echo is so strong that it reflects back off your hull and your transducer hears it a second time, at double the actual depth.
gtstang462002's advice is also good. The range shift will hide the second echo and give you more viewing room of the column.

 

[ELGATODOS]

Go into your sounder settings and adjust your bottom range shift area until you get the picture that you like. For reference, I have mine running at 80.

Roger thanks. It just threw me off as the display was fine, with a single return, then one day out of nowhere it changed. Thanks for the tip