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Transducer Help #12715380 04/13/18 07:30 PM
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JavelinJ Offline OP
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So, I have a hummingbird 998C SI. Everything looks good at idle and what not. But, at speed, I lose bottom.

Does anyone know the protocol for correcting that?


Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: Transducer Help [Re: JavelinJ] #12715413 04/13/18 07:57 PM
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bassmanrudy Offline
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I know on my boat(Tracker PT 190) I lose SI at speed. I run Lowrance Gen 2 7s. Heck I lose 2D on speed as well. I have it mounted low on the aft but not on the little underscooped part. I have been told if I move it down there it would maintain bottom contact better.

Last edited by bassmanrudy; 04/13/18 07:59 PM.

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Re: Transducer Help [Re: JavelinJ] #12715414 04/13/18 07:58 PM
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ETXfisher91 Online Content
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i got the helix 9 and i lose it all except maps when i get on plane

Re: Transducer Help [Re: JavelinJ] #12715420 04/13/18 08:00 PM
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Chris B Online Content
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Where's your transducer mounted?


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Re: Transducer Help [Re: JavelinJ] #12715424 04/13/18 08:03 PM
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Fishinfellow Online Content
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You have to have an in-hull ducer to keep an accurate bottom depth on pad.

Mounted to the Exterior, you won't read anything.


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Re: Transducer Help [Re: JavelinJ] #12715432 04/13/18 08:12 PM
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Pintail711 Offline
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Exactly what speed are you talking about?

Re: Transducer Help [Re: Fishinfellow] #12715442 04/13/18 08:16 PM
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JIM SR. Offline
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Originally Posted By: Fishinfellow
You have to have an in-hull ducer to keep an accurate bottom depth on pad.

Mounted to the Exterior, you won't read anything.




Yes,..!! fish

Re: Transducer Help [Re: JavelinJ] #12715475 04/13/18 08:33 PM
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Jeff From Iowa Offline
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above 10 you need a high speed ducer... most call them thru hull as we glue them to the bottom inside

Last edited by Jeff From Iowa; 04/13/18 08:54 PM.
Re: Transducer Help [Re: Fishinfellow] #12715486 04/13/18 08:39 PM
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Chris B Online Content
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Originally Posted By: Fishinfellow
You have to have an in-hull ducer to keep an accurate bottom depth on pad.

Mounted to the Exterior, you won't read anything.

Not true, I have my 2d transducer mounted externally and keep signal past 60mph.


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Re: Transducer Help [Re: Chris B] #12715563 04/13/18 09:29 PM
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TCK73 Offline
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Originally Posted By: Chris B
Originally Posted By: Fishinfellow
You have to have an in-hull ducer to keep an accurate bottom depth on pad.

Mounted to the Exterior, you won't read anything.

Not true, I have my 2d transducer mounted externally and keep signal past 60mph.


Yep, mine is the same way, no loss of bottom.

Re: Transducer Help [Re: JavelinJ] #12715606 04/13/18 10:00 PM
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JavelinJ Offline OP
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FYI - I never lost bottom on the other boat. So I know I have something not set up right. Just not sure exactly what yet.


Re: Transducer Help [Re: JavelinJ] #12715633 04/13/18 10:18 PM
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JavelinJ Offline OP
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Maybe it is too high?


Re: Transducer Help [Re: JavelinJ] #12715638 04/13/18 10:23 PM
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Re: Transducer Help [Re: JavelinJ] #12715640 04/13/18 10:25 PM
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squib Online Content
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That part of your boat isnt in the water over about 20 mph. It needs to be shoot thru. Either that or lower it to bottom of the step next to drain hole. But youll likely knock it off down there. Glue it in the bilge. As low and center as you can get it. Right in front of the drain in best. I can read mine at 65 mph.

Re: Transducer Help [Re: K.D.] #12715650 04/13/18 10:30 PM
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JavelinJ Offline OP
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Originally Posted by K.D.




That's what i figured.


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