Thread: HB 898 Transducer

The first thing to understand is that there 2 completely different DI technologies....

"DI from SI" (797, 798, 898, 997, 998, 1197, 1198)
"Dedicated DI" (any HB unit that actually has "DI" or "Down Imaging" in the model name)....

"DI from SI" is a computer generated image created by blending the echo data received in the 2 SI crystals and processing that blend into a "DI looking" image...so basically anything that shows in the SI image will also show up in the DI..because it's the same echo data (from the SI crystals)..just displayed differently on the screen...

"Dedicated DI" is echo information received in dedicated DI crystals (455kHz 75° beam, 800kHz 45° beam)...

So, in effect, a "Dedicated DI" unit is, indeed looking down...(in the 455kHz 75° beam or the 800kHz 75° beam)

But a "DI from SI" unit is looking out to the sides are far as the SI looks...(in the 455kHz 180° beam or the 800kHz 130° beam)...

Rickie

Thanks again Rickie for your answers I also read the post on sub forum with all of the pictures with your and others post. I am still learning and I did get a good view of a old bridge over Town Creek last time out. So now I have to adjust the SI to see the fish better,no trouble seeing the bait balls. I will also start trying to look at boat houses and old road beds.

Thanks again and I am sure I will be asking more questions.