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Excessive clutter @ 50khz Furuno 587

Old 05-02-2013, 03:52 PM
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Default Excessive clutter @ 50khz Furuno 587

Hi guys.

Firstly would like to say...Really like the site!, So much good infomation.Have just registered and hope I can give back and help..

Am having a few probelms at the moment with my new sounder set up

Furuno 587 and a Airmar B260 through hull ..

Problem only really comes about in water over 250m (800ft ) on 50khz ( once I turn TVG to high..and start increasing gain..The whole screen just becomes full top to bottem with clutter..I then have to wind the clutter ruduction right up untill a point in 350M (1100 Ft) where I am at max clutter reduction and it is useless..

This is with engines running..Engines off it works pretty well..no clutter..80% of clutter is coming from STBD engine and 20% from port..

I have tried a ferrite block on power supply..No change
Have tried running the sounder off a compleatly seperate battery ( From my car ) up on the bridge for alsolutly so change..

If any body has any ideas that could help that would be awesome, The electronics store and auto electrician both think the alternators need surpressing..But by running it off a seperate battery i thought i eliminated it??..Correct me if i am wrong please

Best regards

Zane
Old 05-02-2013, 04:27 PM
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The sounder chassis probably needs high frequency grounding. Connect an AWG10 from the connection point at the back of housing directly to the negative terminal of the battery you are powering the sounder from.

The optimum grounding point for such HF grounding would be a ground plate mounted at the outside of the hull, but usually a connection to negative battery terminal will do the job.

The noise problem at the FCV-620 on the picture below was solved by grounding the chassis

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Old 05-02-2013, 08:53 PM
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Have you tried the higher frequency tighter beam in the 600-800' of water? The 50kHZ is a wider beam and the 200kHZ is a tighter beam. My Furuno FCV600 would clutter up in deep water on 50kHZ and would do great after switching to 200kHZ
Old 05-03-2013, 04:02 AM
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Abbor- Ok thanks for that..Thats something I never though of will be sure to look into that.

I Have no problem in up to 1000ft using 50kh just when I am going deeper and I change TVG to high thats were it plays up..And with most of my fishing being 1400 plus thats were I need it working perfectly.

Was chatting to somebody today who said it has to be Radiated interference coming in through the transducer cable..Will try re run the cable tommorow and try that..
Old 05-27-2013, 05:41 PM
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Hi, I have ran the transducer cable out the cabin door and up to the flybridge and have moved it about whilst sounding around in deep water with no change at all..

Havent had chance to ground sounder but will do next time i am out.( The clutter coming through looks very different to the pic above anyway but worth a try)

On thing I should mention is that the transduer is mointed right below the stbd engine..Is it possible for the transducer to be picking up harmonics from the engine??
Old 05-27-2013, 07:01 PM
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Contact semperfifishing on here. Electronics guru.
Old 05-27-2013, 07:21 PM
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Originally Posted by ZaneR View Post
Hi, I have ran the transducer cable out the cabin door and up to the flybridge and have moved it about whilst sounding around in deep water with no change at all..

Havent had chance to ground sounder but will do next time i am out.( The clutter coming through looks very different to the pic above anyway but worth a try)

On thing I should mention is that the transduer is mointed right below the stbd engine..Is it possible for the transducer to be picking up harmonics from the engine??
Please post a pic of the screen showing the clutter. It's easy to tell if it's electrical interference or water column clutter.
Old 10-17-2013, 02:53 AM
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Hi,

Sorry am struggling for post a pic.Any tips?

Thanks
Old 10-17-2013, 02:57 AM
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Old 10-17-2013, 04:09 AM
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Old 10-17-2013, 04:15 AM
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Old 10-17-2013, 04:19 AM
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There we go!..Got there in the end.

Settings for that screen shot..

50khz
Tx rate Max
Power 100%
TVG high
Gain 5.5


Just an update, am not any closer to solving the problem.
The transducer is mounted very close to the engine bearers for the STBD engine (Where all this clutter is coming from).
Is it possible that it is picking up vibrations at the same frequency or something along those lines?

Regards

Zane

Last edited by ZaneR; 10-17-2013 at 12:03 PM.
Old 10-17-2013, 07:33 AM
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Try to adjust down the Tx rate, looks like the type of noise often appearing when the ping rate is too high.
Old 10-17-2013, 12:13 PM
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Thanks for you feed back, noted..keep in mind with out touching any settings if I stop the Stbd engine all most of this clutter disappears.
Also if I am sounding around with the port engine ,with the Stbd engine in neutral If increase the revs on the Stbd engine it also cleans it up a little.as the engine revs and harmonics change it changes the picture on the screen.
Old 10-21-2013, 12:48 PM
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