transducer placement issues

HB 597 DI, gets fuzzy screen at higher speeds of 15mph about with the 2d. Placed it up, down, all around but won’t go away, but the DI works just fine at all speeds. Wondering if its the placement, or be caused by having it connected to battery with the 25hp motor to it, higher speed causing more current going to battery causing interference. But then the DI should be affected to?
Dont want to put it on port side BC that’s where the transom electric trolling motor is located. Currently on other, 15″ away from prop, but being a smaller boat perhaps the wash is effecting it anyways. Any thoughts appreciated.

It sounds like it is getting some rough water running by at high speeds. I had a similar issue and I had to move my ducer left or right to avoid the rivets in my hull.

That’s what I was thinking but I have it well over 1/2″ under where it “technically” should line up. Everywhere in between by 1/8″ increments. Next attempt would be a temporary extension of 4″ to really get it down just to make sure its not interference from something.

Sounds normal. Higher speeds mean more cavitation showing up on the 2D.

I’m not sure I understand your problem correctly but here’s what happens on my boat and as I understand it, that’s normal.

Regular sonar will continue to work fine at higher speeds. At least for reading depths but not so much for marking fish. Down imaging and side imagining on the other hand, do not work well at high speeds.
I get really good clarity on my down imaging as long as I keep my speed below 6mph. Higher than that, and its pretty blurry.
Basically, when I’m on plane, I run sonar. When I slow down and fish, I’m generally running down imaging.

However, the way you worded you original question, makes me wonder if I’m not getting the most out of my structure scan.

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I’m not sure I understand your problem correctly but here’s what happens on my boat and as I understand it, that’s normal.

Regular sonar will continue to work fine at higher speeds. At least for reading depths but not so much for marking fish. Down imaging and side imagining on the other hand, do not work well at high speeds.
I get really good clarity on my down imaging as long as I keep my speed below 6mph. Higher than that, and its pretty blurry.
Basically, when I’m on plane, I run sonar. When I slow down and fish, I’m generally running down imaging.

However, the way you worded you original question, makes me wonder if I’m not getting the most out of my structure scan.

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Yup I’m exact opposite, DI works just fine up to top speed in my boat of 27mph, and regular sonar the whole screen gets fuzzy at about 10 or so. Very strange. Figured the higher frequency of the DI was able to cut through the interference whatever way it was coming from. Just not sure where its coming from.

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Yup I’m exact opposite, DI works just fine up to top speed in my boat of 27mph, and regular sonar the whole screen gets fuzzy at about 10 or so. Very strange. Figured the higher frequency of the DI was able to cut through the interference whatever way it was coming from. Just not sure where its coming from.

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Mine works just the opposite… DI is a blur at speed, and off. I’m new at it, but unless I slow down, I get nothing but depth regardless…. DI I thought was like SI, useless at any speed, and best at the 2-4 mph range.

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Yup I’m exact opposite, DI works just fine up to top speed in my boat of 27mph, and regular sonar the whole screen gets fuzzy at about 10 or so. Very strange. Figured the higher frequency of the DI was able to cut through the interference whatever way it was coming from. Just not sure where its coming from.

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Mine works just the opposite… DI is a blur at speed, and off. I’m new at it, but unless I slow down, I get nothing but depth regardless…. DI I thought was like SI, useless at any speed, and best at the 2-4 mph range.

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Well what the deuce is going on? Might have to put in a call to CS.

Look at it this way.

Your sonar sends X number of signals a seconds.

As your feet per second increases, your signals per foot decrease. Faster and Faster the less and less your sonar is going to show.

At full speed, you might catch a fraction of a fish (DOT) At slower speeds, your sonar will mark the entire fish (ARC).

Higher speeds just ARE NOT going to give you ANY DETAIL in comparison to slower speeds. They all should continue to show you depth at any speed, but i wouldn’t be expecting to mark fish at full speed.

It’s like driving by a strobe light. Drive by slow and you get flashed several times. Drive by 30mph and that strobe might light you up once…

DI casts a line like SI. Very thin beam, where as 2d sonar throws out a 360 degree signal.

I consistenly use my SI effectively at speeds from 0 to 8 mph. Anything over those speeds you are missing so much detail it’s nearly pointless to have your SI on for anything besides depth. Mine works up to 30mph, but certailny gets grainy after 7-9mph.

Those with DI working well at high speeds, my assumption is that you actually aren’t seeing Sh*t at high speeds, but yoru screen might possibly be free of cavitation.

Hold on a minute here.

I just noticed that this is the Hummingbird forum.
I run all Lowrance and for the most part, always have.
Running at high speeds, I can still get perfect readouts of the bottom (not fish).
But my Structure Scan is only good up to about 6 mph.

I’m guessing it might be just the opposite for you guys running birds.

I just noticed running up the Minnesota tonight that my 998 is doing the same thing. My di stays working at high speeds but my 2d is not.

Si worthless at High speed?

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Si worthless at High speed?

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Absolutely not, just not for marking fish at those very high speeds. You’re really only showing small slices of big structure at high speeds, so major things will show up like you’ve got there reddog.

If my boat would go over 30mph, i imagine my SI would work fine above that speed as well as it works fine from 0-30.

I was basically just trying to say that by no means should anyone expect the same quality image and detail etc at speeds higher than their chart speed MAX.

Nothing new to you reddog. You know more about these, have more experience, etc with the birds.

Mine stays on SI most of the time. Even when the 2D depth decides it doesnt want to read, my water column in SI stays intact, and without seeing depth numbers, I can tell how I am with the water column in SI. Not sure why it does that, but it does..

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Si worthless at High speed?

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Absolutely not, just not for marking fish at those very high speeds. You’re really only showing small slices of big structure at high speeds, so major things will show up like you’ve got there reddog.

If my boat would go over 30mph, i imagine my SI would work fine above that speed as well as it works fine from 0-30.

I was basically just trying to say that by no means should anyone expect the same quality image and detail etc at speeds higher than their chart speed MAX.

Nothing new to you reddog. You know more about these, have more experience, etc with the birds.

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Aluminum hull? Rivets in line with the transducer?