humminbird greg

Since I posted my last message in the wrong section I will try this one. Greg, I am interested in the HB 596c hd DI. Have tried to read this on line, still not sure. I want to be able to get 1 to 1 bottom ratio from my trolling motor mount......
Q# 1 Can I get this from the transducer that comes with this unit?

Q#2 If I want transducers on transom and trolling motor, what transducers do I need( of course I will need the swich )

Q#3 Will down image work alright on the trolling motor, or will speed be a problem

Thanks, love to read all of your responses and I have learned alot fropm this forum.

Maybe this will help with your ratio question...

http://i477.photobucket.com/albums/r...c/45c336a5.jpg

Rickie

Am I reading this right in that the down imaging has a wider band than the 2D sonar?

Yes, wider left to right but VERY MUCH thinner front to back. So when moving forward a piece of structure under the boat will show on your 2D sonar before it will show on your DI image. But a piece of structure farther out to the left or right will show on the DI but may not show on the 2D because it is out of the cone coverage area, and you won't know what side of the boat it is on.

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Originally Posted by blairarnold

Am I reading this right in that the down imaging has a wider band than the 2D sonar?

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Yes ... Kenny is correct in that a 2d signal produces a circle, while a DI produces a fan shaped cone. A 2d sonar is giving you a 2 dimensional picture of what's within the cone. A DI sonar signal is producing slices thru the water, giving you a closer to 3 dimensional picture. The cone angle degrees are relative to the signal strength, along with the (shape) side to side & front to back width of the coverage area.

The illustration that "rnvinc" has in his post, shows you how each signal is shaped. Take special note of the "Top View of Sonar Beams" illustration ... that shows you what the difference in shape & area coverage is, of a 2d cone (circle) vs a DI cone (fan). The Area of Coverage menu tells you that a DI cone has 3-4 times the left to right angle of coverage, but only 1/3-1/4 the front to rear angle of coverage area. (I believe the front to rear angle is something on the order of 6 degrees of angle).

If memory serves me ... a 60deg cone angle is the widest there is on a 2d unit (triple 20deg cones). But even then, the units are only able to give you a 2d picture. DI units are "scanning" with their narrow depth/wide width cone, and the higher processor power of those units can composite a more 3d version of the signal ... translating the return signal into more of a "picture", than a "representation" (like what you get with the pixel collection of a 2d unit). It's also why DI units need to be moving forward, in order to get the scan info from different angles, and "draw" the more detailed image on the screen.

The more power the unit has (kHz) in the output, and the smaller the pixels (more pixels per given area) ... the more detailed the screen image can be.

* that's the way I understand it, anyway !! I'm no expert on anything, and don't claim to be :biggrin

... cp :cool:

These guys explained that very well..

I would offer to add... Always consider that sonar is not a "camera" looking down into the water..It's a sound wave transmitter..

Everytime the unit "pings" ...a sound wave (in the shape of the specific beam angle) is sent thru the water...

Echos received in that "ping" are processed and "plotted" onto the unit's screen in a thin strip (a few pixels wide) to the far right of the 2d or DI screen...

The very next "ping"s echo data is processed and plotted onto the far right of the screen....pushing the previous "ping" data to the left...

This "stacking" of echo data into strips onto the far right of the unit screen ...is what "builds" the screen image on the unit screen...

The only data showing on the screen image that is currently under the xducer.. Is the strip at the far right of the screen... Everything to the left of that thin strip on the screen is "history" that the xducer has already passed over...(and no longer in the sonar beam)...

Rickie

Thanks for the answers. You all have taught me a lot. It's always a good idea to deal with people smarter or more knowledgable than I am.

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Originally Posted by blairarnold

Thanks for the answers. You all have taught me a lot. It's always a good idea to deal with people smarter or more knowledgable than I am.

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Not 'smarter'.....just ....

Been there, done that....with the same questions you have......

Questions is how we all learn...keep asking...:)

Rickie

thanks i needed to know that.

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Originally Posted by crappie1133

Since I posted my last message in the wrong section I will try this one. Greg, I am interested in the HB 596c hd DI. Have tried to read this on line, still not sure. I want to be able to get 1 to 1 bottom ratio from my trolling motor mount......
Q# 1 Can I get this from the transducer that comes with this unit?

Q#2 If I want transducers on transom and trolling motor, what transducers do I need( of course I will need the swich )

Q#3 Will down image work alright on the trolling motor, or will speed be a problem

Thanks, love to read all of your responses and I have learned alot fropm this forum.

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Crappie1133,
Q #1 - If you are meaning a 1 foot wide coverage area for 1 foot of water depth, than I think the image that Rickie posted should answer your question (nice image of the Di and 2 sonar beams there Rickie).

Q #2 – The only transducers we have right now that will work with any of the DI units is the XNT-9-DI-T. You will have to either purchase the Humminbird AD-XTM-9 trolling motor adapter bracket or an adapter from another company like Transducer Shield & Saver (this one actually helps protect the transducer). You will also need the TS3 Transducer Switch.

Q #3 – I think that this was covered by the others; the DI sonar needs movement in order to build up the images that many have posted. With no movement the unit would continue to update the display with the same sonar data (this is also true on the 2D sonar as well) and would repeat it over and over again.

Wow , Thanks everyone.I understand now that to get 1 to 1 water ratio on 2D sonar I have got to pick another unit. I want to get more than 3.33 feet in 10 feet of water. (20 dec. cone angle) I think everyone is saying that on a stationary or slow moving boat, the sonar showing lots of fish could be picking up the same one or two instead of a screen full. If I just purchase a 2D sonar with dual beam plus can I get more bottom coverage. Thanks , Greg for the information on transducer and switches. Maybe I am asking to much or am looking for something that is not availiable yet.Thanks again everyone for the valiable information.

crappie1133,
If you want a wider coverage area for 2D sonar than the standard DualBeam units that we make will work best for you. Just make sure that it is a 700 series unit (DualBeam Plus sonar) so that you can select to display the wider 60 degree 2D sonar beam information as it covers 1 X the water depth for coverage area.

For the widest coverage area (with a single sonar beam) you can’t beat the 75 degree coverage you get with the 455kHz DI sonar beam of our DI units.

A third option is to use a unit that can use the QuadraBeam transducer which uses three sonar beams to cover a 909 degree area. This gives you 2X the water depth in coverage area. Wider than this is only available with an Si sonar unit.

Now as far as using each sonar in shallow water: the lower frequencies (like the 60 degree 83kHz sonar we use for our DualBeam units) does not work as well as the higher frequencies does (like the 200kHz and 455kHz). They also cannot show as small of sonar signal returns or detail as the higher frequency beams can.