798 SI help please

Attachment 87994Attachment 87995on right side of SI when you get over 12 feet deep it is very distorted, left side is clear. If I turn around it is still distorted on the right screen.. It gets so bad on right side as I go deeper at times I cannot see where water column stops but left side is still fairly clear. The transducer is clear with nothing blocking view on either side. I have tried to adjust it up and down with the sentivity yet it still will not clear up.. Any help would be appreciated. thanks

I don't know much about these, but that almost looks like RF interference. I wouldn't think RF noise would show on just one side tho. You might be able to test if you turn off whichever motor you are using momentarily, then back on. If you see a clear spot with the motor off, it may be noise.

I can cut motor off and all other DF and it still do it

Gene...Can you post a pic of your xducer mounting setup...both from the rear and from the side...??

Rickie

Rickie,will post it Sat,will not be able until then, but it is mounted under the step down near drainage.It is a bass tracker,it has a clear path over 180%

Is the TD mounted on the port side of center?

Gene,
If there is no obstruction than the problem could be in the unit or transducer. See if you can find someone to let you test your unit on their boat. It does not have to be 798 unit but it does have to be another Humminbird Side Imaging unit. Just plug in the power cable and transducer to test it.

thanks greg, I have a friend coming to visit and he has a 798 . we are going to put his unit on my transducer and my unit on his transducer ,then we will know weather unit or transducer is problem.It has got so bad can hardly see on right side while left side is fine. It makes DI where it is hard also. Will let you guys know next week,am camping and on week end I come home and have internet. I thank you guys

Attachment 88332Attachment 88333Attachment 88334Pictures of transducer of my 798

The pictures sure look like a good setup...

Hopefully your upcoming test with your friend's unit will help you find the problem...

Rickie

To me it looks like the right side of your TD might be picking up turbulence . See if you can drop it down a couple more inches and see off the problem gets worse/better or shows up on both sides. Looks like you have another transducer up higher and to the right. Put your side imaging TD there and I bet your problem clears up although you may have to slightly trim your motor up at times for the best picture.

it does it even when engine is off and other unit is off

Gene, did you ever find the answer to this problem? I have the same issue. Thanks.

KJACK,YES FOUND PROBLEM,WHEN I HOOK UP DUCER THE EXTRA CABLE I JUST ROLL UP AND THAT WAS WHAT CAUSE IT,WAS SUPPOSE TO FOLD IN MIDDLE AND ROLL,THAT WAY CABLE IS WINDING UP BOTH WAYS.HOW I FOUND OUT WAS BOUGHT A 998 AND AFTER A WHILE IT DONE IT ALSO, DON G WAS WITH ME AND WE DEFAULT THE UNITS AND REWIRED THEM AND THEY HAVE NOT DONE IT SINCE,OVER A YEAR AGO. I WOULD SEND IT OFF AND THEY WOULD +FIRST DEFAULT IT AND THEN SAY NOTHING WAS WRONG, BUT IN A FEW WEEKS IT WOULD DO IT AGAIN,PROBLEM IS NOW SOLVE. MAKE SURE U DEFAULT IT FIRST, HOPE THIS HELP

Thank you, Gene. This is great information. I have my extra TD wire rolled neatly all in the same direction. I have tried everything but never thought of that. I will try it. Thank you, Merry Christmas! Keith

My 798 does the same thing also. I too will try this trick. Let me see if i understand you correctly. The excess transducer cable should be folder both ways (once towards the transom and then the next wrap back towards the bow) until you use all of the slack cable, to eliminate external magnetic interference into the cable?

Quote:

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Originally Posted by fishingman

My 798 does the same thing also. I too will try this trick. Let me see if i understand you correctly. The excess transducer cable should be folder both ways (once towards the transom and then the next wrap back towards the bow) until you use all of the slack cable, to eliminate external magnetic interference into the cable?

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Coil the excess cable into an 8" coil ...

Then, twist the entire coil into a "figure 8" and fold 1/2 of the figure 8 (4" coil) onto the other 1/2 of the figure 8 ...creating a duo-directional 4" coil ...

Rickie

I never knew that! Going to try it, I have a 1198 doing that.

Lord have mercy, just when you think you have heard it all something like this pops up. I just installed SI on my boat but have not had a chance to run it yet. It is a Lowrance HDS 7 touch screen. Wish my transducer was as compact as yours. Mine is about a foot long. I will check my cable tomorrow.

Thank you soo much for the info. I will do this before my next trip.