Thread: PVC cover

Originally Posted by rnvinc

Air isn't the only density difference factor that Sonar detects ...

There are other substances besides air that also have a different density than water (fish flesh, scales, structure, bottom composition, etc) ...

Air would be in the "less dense" category vs water ...
Flesh, scales, structure, etc would be in the "more dense" category vs water ...

Either side of the "vs water" density would be different than the water density itself ...

Rickie

OK, I got all that !! So, if a 2d sonar beam was restricted to a narrow fan shape by blocking the front & rear of the cone ... would/could it produce a similar image as the DI ?? It wouldn't, would it ?? But, is it the shape of the crystal or the frequency being transmitted that determines the image ?? Or am I comparing apples to oranges, here ??

Originally Posted by CrappiePappy

OK, I got all that !! So, if a 2d sonar beam was restricted to a narrow fan shape by blocking the front & rear of the cone ... would/could it produce a similar image as the DI ?? It wouldn't, would it ?? But, is it the shape of the crystal or the frequency being transmitted that determines the image ?? Or am I comparing apples to oranges, here ??

The shape of the piezo only affects the beam shape ... round piezoes create cones / bar piezoes create slices and fan beam shapes ... (size affects beam
Angle) ...

If we were to connect a bar shape piezo to the 2d wire channel = we would have a fan (or slice) shape 2d Sonar beam ...

Fish echoes from this scenario would be painted in the 2d image as a colored dot (depending on 2d palette choice) ... just like a DI fan beam paints a white dot ...

A "dot fish echo" vs an "arch fish echo" we know is simply created by target time in the Sonar beam ... a fan beam doesn't allow the target to be pinged as many times ... and the few times that target is pinged in the fan (or slice) beam, the target is basically the same distance from the xducer (or negligible difference anyway) ...

Now to expand this scenario some ...

If we increase the frequency of this scenario's 2d fan beam (to 455kHz or 800kHz) ... we may even see some these 2d fish echo dots that look like fish ... but colored (depending on 2d palette choice) ...

Basically ... imaging is imaging because of higher frequency and fewer pings on the target ...(and processing the returns into several shades [by strength of return] of the same imaging palette color choice) ...

Rickie

I HAVE PUT PVC IN LAKE AND FOUND SOME IN IT ALSO ,I CAN SEE IT ON MY UNITS,859 AND 1199,I SAW IT WHEN I FIRST PUT IT DOWN,SAW IT A WEEK LATER AND SAW IT A MONTH LATER AND SAW IT PASS WEEK,DID NOT TRAP AIR IN IT ,NO ALGAE ON IT,AND DID NOT SCRATCH IT UP,IT IS A MATTER OF SETTING YOUR UNIT UP RIGHT TO SEE IT,HOWEVER YOU DO NOT NEED TO SEE IT IF YOU KNOW WHERE IT IS ,JUST SEE FISH AND IF NO FISH ,KEEP GOING

Thanks, when you say setting my unit right to read the pvc do you have a tips on doing that? I have Lowrance HDS units.
The reason i want to make sure I am on the cover is because I put the pvc cover in an area with current,

Which Lowrance?

I have the hds 9 touch gen 3 on the dash and a hds 8 on the front hooked to trolling motor

Originally Posted by steve telinda

Thanks, when you say setting my unit right to read the pvc do you have a tips on doing that? I have Lowrance HDS units.
The reason i want to make sure I am on the cover is because I put the pvc cover in an area with current,

If you have current, do't expect your stuff to be where you dropped it if the water has much depth. Trust me.