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[TG11] Can’t get rid of sounder clutter
07-30-19, 11:51 PM (This post was last modified: 08-07-19 08:24 AM by Chuck - Raymarine - Moderator.)
Post: #1
[TG11] Can’t get rid of sounder clutter
Hi just wondering what the problem is and how to fix it. I run a tm275 with a co470 and axiom 9, I’ve run all my wiring off a seperate battery and atm have the transducer cable separated from all other wiring. I have ran the transducer at different heights but still remain with the same problem

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08-15-19, 09:58 PM
Post: #2
RE: [TG11] Can’t get rid of sounder clutter
Hello Wawacoco,

Sorry you've not had a reply before. In case you haven't already got an answer, for example by calling our support team:

Moving a transducer up and down can help with problems with air bubbles across the transducer face (which cause gaps in the sounder image and low signal levels) but won't generally help with high clutter/noise problems.

Can you tell me what Sensitivity setup you were using when you took the video?
Do you have any other images or video in a bit deeper water?

In you video there is an increase in background noise coinciding with what I can hear of the engine revving up, but it's normal to get an increase in noise with increasing speed. Your transducer doesn't hear at the same frequency you do, but the increase in sound volume is the same either way. If you've shifted transducer cabling and tried with a separate battery then the noise is almost certainly acoustic (actual sound volume at the same frequency the transducer's working at) rather than electrical noise. There's not a lot that can be done about that - boats at speed are noisy places - but stepping the transducer mount off the transom on a rubbery anti-vibration mount can help, if the worst of the noise is transom vibration rather that prop, drivetrain, water-flow etc.

I describe noise like this to people as like trying to have a conversation in a noisy bar: even if your mate shouts, it can be hard to hear them over the noise.


Raymarine since 1999.
Interests: Diagnosis of problems in sonar/fishfinders, NMEA2000, ethernet comms, autopilots, thermal cameras
Location: Sydney, Australia
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