Sonar Quiz #24

Learned some from this thread. Was this a power drift? I can't seem to wrap my mind over how the drift produced a clean boat image.

Thanks Rickie for that information, very interesting. The Onix looks really good and I assume it has the third piezo in it. (DI)
I'd love to see the homogeneous bottom the use for testing these problems.:biggrin
LarryB

Quote:

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Originally Posted by Superx10

Learned some from this thread. Was this a power drift? I can't seem to wrap my mind over how the drift produced a clean boat image.

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If you are asking about the OP image ... I assume Spearfish III was trolling under power ...

Rickie

Quote:

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Originally Posted by rnvinc

"Dark lines" aka "Ghost Lines" aka "Washboard lines" anomalies show up in side scanning images most commonly in examples of side scan images captured while using an xducer that has both "side pointing" SI piezoes and a "down pointing" DI piezo ...

LSS 1
Attachment 274217
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LSS 2 (not as prominent but still there)...
Attachment 274218
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Onix
Attachment 274219
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Garmin
Attachment 274220

Overlapping slice beams create an effect similar to this beam form example which end up showing in the SI image as the dark lines ...

Attachment 274221

Rickie

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Rickie, with the onix, you can run the di on a different frequencie than the si or , if you choose, just turn the di off.

Quote:

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Originally Posted by kosmo

Rickie, with the onix, you can run the di on a different frequencie than the si or , if you choose, just turn the di off.

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From what info I can find ...Onix (and maybe Ion) is the only unit (with SI piezoes and a DI piezo in the same housing) that the DI piezo can be shut off to completely eliminate the issues caused by overlapping slice beams ...

Rickie

Interesting stuff.