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Lowrance side scan issue - may be transducer placement

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Lowrance side scan issue - may be transducer placement

Old 03-30-2015, 08:33 AM
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Default Lowrance side scan issue - may be transducer placement

I need some help please. I recently bought a new electronics suite including several Lowrance products. My issue is with my HDS Gen2 9" touch. In particular the Structure scan.

The issue is I can’t get the structure scan to display with any usable clarity. I can make out faint and fuzzy images of dock pilings but almost nothing else. I have spent hours slowly trolling past several types of structure including sunken boats, many docks, and my local marina. I have tried to adjust all available settings, including frequency, transparency, range, and contrast. I have tried the Auto settings as well, all with no improvement. I have spent hours reading the manuals and watching both the Lowrance knowledge base videos, Hull Truth forums, and YouTube vids. I have exhausted all the tools available to me.

The down scan seems to display somewhat better as I can discern some bait pods and bottom detail.

I realize that transducer placement can be critical so I have attached pics showing my set up. My local marine rigging tech installed my equipment but may have not placed the transducers properly. I have both the structure scan and the 83/200 transducers as you will see in the attached pics.

Just to keep this issue in perspective I LOVE my new equipment! I bought not only the HDS unit and both transducers but also the Sonic Hub, the NMEA 2000 backbone, Engine interface cable, and the Fuel level cable - all work GREAT!

Your help will be most appreciated...thanks in advance!
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Old 03-30-2015, 09:13 AM
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Damn there's a thread going right now about a guy with a hydrofoil that's throwing washy water at the ducer. Seems like your trim tab could be the culprit. It could be splashing the water around the ducer causing interference
Old 03-30-2015, 09:18 AM
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It seems to me that the StructureScan transducer would be far better mounted on the same surface that your other transducer is mounted on.
Old 03-30-2015, 09:45 AM
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The structure scan ducer looks like it's to high to me which would cause air and turbulence that could cause the fuzzy look. The tab could cause some issues to if it was down during use.
Old 03-30-2015, 11:44 AM
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move it down first,if that doesn't help then move to where the other ducer is.
That being said,the other ducer looks like it might have to go down a little more too. If your reading from that are lacking then move it down too.For this ducer to be mounted behind the angled hull one side will always seem too low relative to the water slip stream,but that is what you have to do to make sure the high side is in the water.
If you do have to move the side scan ducer down- same thing- no bubbles or water that may have been disturbed by the hull in front.
I f you have to move the side scan down don't put it near the area where the flat hull and the angles hull meet-there could be turbulence there too-put it right in the middle of that flatted area.This could also be part of the problem you are having where the side scan is mounted now.
Question- does the resolution from the 2D transducer change from clutch speed to a slow plane ?
Also, be aware that if you have to move it down you might get a slight shadow from your lower unit on the port side- I know I get a little with my set up and I am about the same distance laterally as you are where you are mounted now.
Best of luck.
Wen
Old 03-30-2015, 11:46 AM
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wen
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Incidentally- you have the same hardware as I do-- consider getting the TM150M- you won't believe the difference !Like nite and day !
Old 03-30-2015, 01:17 PM
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I would have mounted it where the other transducer is. However, the current position does not appear to be horrendous. Before moving the transducer, I would suggest taking a look at how the cable is routed. Make sure it is not run alongside the tachometer wire. After that, loosen the screws up and slide it down. If that still doesn't work, it probably should be moved to somewhere around the drain plug.

If you can record a screenshot of sidescan in action, you might get a little better insight here.
Old 03-30-2015, 02:49 PM
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Join the growing group of unhappy Lowrance structure scan owners. I have never gotten mine to work as advertised. Installed by a "Lowrance certified installer", "tech support from Navico"
Old 03-30-2015, 03:32 PM
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Looking at this again from the computer now and am able to see the pic better.... it also looks like its too close to the 45 degree bend in the hull (left of the flat area) that could be the problem as well.
Old 03-30-2015, 04:07 PM
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First off my structure scan works beautiful.second thing u have the transducer in wrong spot the ss should b below the sonar trans plus ur getting too much turbulence from all the bends like fish hunter says you've got a lot of bends so I would try them right near the drain plug
Old 03-31-2015, 06:00 AM
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Thanks for all the thoughts...seems like the consensus is that the SS TD maybe should take the place of the 83/200, and the 83/200 repositioned to just left of where the SS is now? Just a little concerned about the duper being vulnerable to an accidental debris hit.

I did send pics to Lowrance Customer Support and should hear back soon. Will update for the benefit of future THTers.
Old 03-31-2015, 08:33 AM
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Rick what speeds are you going when you are having your issues? Is it giving you trouble even when drifting or moving at idle? My first thought as well was the fact that your transducer is right next to the trim tab. That seems like a bad idea to me.

You might want to read over my thread as well for additional advice on mounting positions:
Here

I am wondering if we are having the opposite problem. My structure scan works great at slow speeds, but I can't get my normal sonar to read at speed. I am considering moving my 83/200 to the location where yours is at to fix. Do you have any issue with holding bottom or getting a lot of interference on the screen above hull speeds?
Old 03-31-2015, 10:53 AM
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the structure scan is usually mounted to the center and lower than any other transducer. You also have it mounted in a pocket in your hull, which will likely cause more turbulence. moving it to where your other transducer is would be best, and then mount that tranducer at your next sloped part of hull to the outside, just to the left of where your structure scan transducer is now. or mount them both down at that bottom area. There seems to be enough room for both.
Old 03-31-2015, 11:18 AM
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Kevin, slow trolling speed...will read your thread - thanks.

Originally Posted by Dbl0Kevin View Post
Rick what speeds are you going when you are having your issues? Is it giving you trouble even when drifting or moving at idle? My first thought as well was the fact that your transducer is right next to the trim tab. That seems like a bad idea to me.

You might want to read over my thread as well for additional advice on mounting positions:
Here

I am wondering if we are having the opposite problem. My structure scan works great at slow speeds, but I can't get my normal sonar to read at speed. I am considering moving my 83/200 to the location where yours is at to fix. Do you have any issue with holding bottom or getting a lot of interference on the screen above hull speeds?
Old 03-31-2015, 05:05 PM
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In my opinion you are geting air bubles and the transducer as a weak signal.
If you look at the manual you should get the transducer around 1cm below the hull.
You have one potential problem there also.
That inverted degree were you have the other transducer is certainly making a lot of bubles in your lss transducer.
I had that problem in mine. I filed the inverted degree with a nylon block and after i could get readings at around 25 knots and before i loosed bottom at around 6 knots.

Here are my solutions, maybe a litle unconventional:
Lower the transducer were it is and in a way that the bottom sits around 1cm bellow the hull. If you still have problems, try to fill the diference of the inverted degree to the back of the transom with a temporary solution and test it;

The other sugestion is my favorite one. In your inverted degree, put the LSS transducer inverted (you have to configure with the inverted position in your sonar) at the right of your other transducer and make sure you fill the diference with nylon or something else in a way it sits below the bottom of the hull (almost as it was a thruhull transducer). You can also try to do the inverted transducer directly in the hull were it is now.

Regards
Old 03-31-2015, 06:42 PM
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2dogs... SS does work quite well it speed if installed to allow it to do so, check out the screenshot... had an even better image but I didnt hit screen shot on it. As you can see on the lower right side there is a ledge plainly visible. Regardless if not mounted so its NOT in turbulent or aerated water it will result in sub par readings
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Old 04-01-2015, 05:31 AM
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FISHUNTR, What do you find is the upper speed limit for decent SS readings?

Originally Posted by FISHUNTR View Post
2dogs... SS does work quite well it speed if installed to allow it to do so, check out the screenshot... had an even better image but I didnt hit screen shot on it. As you can see on the lower right side there is a ledge plainly visible. Regardless if not mounted so its NOT in turbulent or aerated water it will result in sub par readings
Old 04-01-2015, 06:20 AM
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for best performance i have found on the large lss2 mounting it deep is better.
Old 04-01-2015, 10:33 AM
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Originally Posted by Jorinho View Post
In my opinion you are geting air bubles and the transducer as a weak signal.
If you look at the manual you should get the transducer around 1cm below the hull.
You have one potential problem there also.
That inverted degree were you have the other transducer is certainly making a lot of bubles in your lss transducer.
I had that problem in mine. I filed the inverted degree with a nylon block and after i could get readings at around 25 knots and before i loosed bottom at around 6 knots.

Here are my solutions, maybe a litle unconventional:
Lower the transducer were it is and in a way that the bottom sits around 1cm bellow the hull. If you still have problems, try to fill the diference of the inverted degree to the back of the transom with a temporary solution and test it;

The other sugestion is my favorite one. In your inverted degree, put the LSS transducer inverted (you have to configure with the inverted position in your sonar) at the right of your other transducer and make sure you fill the diference with nylon or something else in a way it sits below the bottom of the hull (almost as it was a thruhull transducer). You can also try to do the inverted transducer directly in the hull were it is now.

Regards
Here are some drawings I made.
Sorry but I never was good at drawing class!!!

I added other option.
In the left of the image you have the side view of it. The black lines are the hull. The round red is the transducer and the rectangular red is a Nylon Block or something similar.

I think that your main problem is air bubbles in the transducer, and I suspect that the inverted degree and maybe the flap have to do with it.
In my case, I had the transducer about 25cm aside of an inverted degree and when I filled it with the nylon for another transducer my LSS started to work fine (even without any change).
I think that those inverted degrees make some kind of vacuum effect and induce air around them.

Hope to have helped!

Regards
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Last edited by Jorinho; 04-02-2015 at 05:06 AM.
Old 04-02-2015, 06:14 AM
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Thanks for the effort Jorinho!

Originally Posted by Jorinho View Post
Here are some drawings I made.
Sorry but I never was good at drawing class!!!

I added other option.
In the left of the image you have the side view of it. The black lines are the hull. The round red is the transducer and the rectangular red is a Nylon Block or something similar.

I think that your main problem is air bubbles in the transducer, and I suspect that the inverted degree and maybe the flap have to do with it.
In my case, I had the transducer about 25cm aside of an inverted degree and when I filled it with the nylon for another transducer my LSS started to work fine (even without any change).
I think that those inverted degrees make some kind of vacuum effect and induce air around them.

Hope to have helped!

Regards

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