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We discussed this screenshot in comparison to another SI image in Quiz #6...
Now let's examine this screenshot by itself...
Attachment 272530
The right SI is considerably brighter than the left SI...
List the reasons that can cause this difference in the same SI image...and explain each reason separately...
Rickie
Aint nothing out there to echo back. The signal travels into the abyss.
To me, the fish returns seem the same intensity, with a difference in brightness only on the bottom. This could be that the bottom is transitioning from soft to hard bottom. Another possibility might be there is interference on the left side, possibly from the motor, and that may be partially blocking some of the TD signal.
the left side is getting deeper and the right is getting shallower
that's my thought on it because of the depth indicated from the centerline at max depth according to lines on the screen
I might and or could be wrong though
I'm going to say that the transducer is not parallel to the water side to side. I'm also going to say the td is mounted on the starboard side of the boat and has the port side of the td tilted up when it's in the water. IMO there is some interference also as seen by the white line on the port side of the water column about 4' deep. The wide black band under the boat on the port side may also be caused by the transducer install. I've never seen it on any of my Lowrance images and are not familiar with how finicky HB units are to td installation.
the reason is the right side is toward shore ,up hill side,and left side is away from shore,getting deeper,it will also do it when one side is harder bottom than other side,but that do not seem to be the case here because you would have some of that brightness on the beginning of left side as the transducer singal cross each other near middle
Transduce is turning to the right.... note elongated fish shapes. Turn allows more sonar reflection from right than left due to time on scan.
Mine always looks like that.
Ima right about echo return you know. Betch ya.
Boat is travelling southwest, the sun has began to fall in the west (5:32PM) March 9. The angle of the sun to the water is my guess.
Most of the possibilities have been listed...and each very good explaination...
There is still 1 possibilty no one has listed ...and it has to do with the internal workings of the unit/xducer....
Any guesses...??
Rickie
Interesting, could you please explain?Quote:
Originally Posted by chulai1968
My guess is based on the readout of the fishfinder.
The angle of the sun to the water has nothing to do with how the sonar will look. Sonar is listening only to acoustical energy, not light or heat from the sun.
Well still no guesses on the last possibility (hardware related)...that can cause 1 side of the SI image to be brighter than the other...??
Rickie
One side of the transducer could be starting to fail.
Quote:
Originally Posted by BobB
Ding, ding, ding, winner of a chicken dinner and I concur with your theory!
Mounted wopsided. Musta hit a stump and/or the xducer has old folks blockage.
Where there is nothing, you see nothing. Blip. blip. blip.
My theory is based on the signal being attenuated(loss), resulting in the echo return to be distorted. Like I said in the beginning, it was just a guess.
My guess also after seeing rnvinc's post yesterday looking for such a TD.Quote:
Originally Posted by BobB
I believe you guys finally got close to the un-obvious possible cause...
If the "1 side only" darker SI images (in my specific setup) were singled to only 1 specific HDSI xducer...then it could possibly indicate a problem with the left SI piezo starting to fail (as you guys mention)...
In the specific case of my setup...2 separate HDSI xducers and the LSS 2 I run ...are consistently darker on the left side...
This is an indication that my unit has a left SI transmitter possibly starting to fail....
"Sonar quiz #7" was offered as a learning tool to help realize all the possibilities in SI images being brighter or darker on 1 side only...
Sometimes this scenario can be duduced down to hardware related issues...
Rickie
Where there is nothing, you see nothing. The abyss.
The left side could be being too responsive and returning sensitive echoes. The right side might be normal. The crystals are not "bulbs".
On my 798 up front the right side is too responsive ,it do not take much to cloud it up,i have to cut sonar off on 998 in back to stop it from clouding,not the transducer but in the unit itself,have put 2 more ducers on it and will do te same,always the right side and that make the di do it beens it gets its information from both sides of si
Global warming has ruined everything?
And Gremlins...Quote:
Originally Posted by brettw
:yikes
Rickie