Hummingbird 899 transducer

[Diago]

Just got the 899 with side imaging. I also got the two transducers. How far apart should I mount the transducers.

Thanks for the advise

Jim

[BartmanMN]

Why do you have two? You only need the XNT 9 SI 180 T, unless you are T'ing it off an running the same unit off a ducer up front too.

[Diago]

I was told I need the side imaging one that will read up to 10mph and the other one for reading the depth at high speeds

[BartmanMN]

I'm not sure what model your other transducer is, but I've never heard of that explanation about one for high speed.

This link shows the difference in the cone angle/frequency range between the XNT and XHS High Def models.

http://www.humminbird.com/Category/Support/FAQ/HDSIvsCompactSI/

[Diago]

Bartman,

Do you have the 899 with side imaging? Can you run at high speeds and still get a bottom reading?

Jim

[thatoneguy]

With many boats, you don't get a good reading of the bottom with the 'Bird SI units when on plane. You can add a second 'ducer mounted separately and connected with a Y cable to work around that - I'm guessing that's what diago is referring to here.

[h8go4s]

With many boats, you don't get a good reading of the bottom with the 'Bird SI units when on plane. You can add a second 'ducer mounted separately and connected with a Y cable to work around that - I'm guessing that's what diago is referring to here.

Exactly. It all depends on the boat and the transducer location. On my Alumacrft Classic 165, I can get good readings at my top speed of 29 mph. I've seen posts of good results up to 40 mph also. Stepped transoms are somewhat problematic, and lots of sparkly glass boats need a separate 2d transducer for high speed readings. The Y-cable uses the 2d signal from the 2d transducer and the SI signal from the SI transducer. It doesn't matter how far apart they are.