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Max Online: 36273 @ 01/23/13 02:34 PM
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#12507086 - 11/17/17 03:00 PM Graph question
T-Gauntt Offline
Pro Angler

Registered: 04/02/12
Posts: 667
Loc: Sachse, TX
I'm sure this question has probably been asked time and time again on TFF but if I step on my trolling motor and it causes interference on my depth finder, what is the cause? Is something not grounded properly?
_________________________
-Taylor


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#12507186 - 11/17/17 04:23 PM Re: Graph question [Re: T-Gauntt]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 6413
Loc: Boerne, Texas
If you have a minnkota, pull the head cap off and see if the fuse is blown. There are multiple reasons for electrical interference: prop is knicked up/damaged, transducer cable is close to the tm power wires, bad bearings in the tm motor, graph powered by the tm batteries. I’ve even swapped graphs around and had the interference stop.


Sometimes a ferrite choke will help too.

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#12507420 - 11/17/17 08:00 PM Re: Graph question [Re: T-Gauntt]
Dayne Online   content
Extreme Angler

Registered: 12/16/06
Posts: 2999
I run Motorguide trolling motors and Lowrance electronics. On the last 2 trolling motors I have had to install ferrite chokes to reduce the interference.

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#12507966 - 11/18/17 09:38 AM Re: Graph question [Re: T-Gauntt]
shut-up-and-fish Offline
TFF Celebrity

Registered: 02/08/10
Posts: 9911
Loc: Lewisville Tx.

Is the graph wired direct to the starting battery (recommended)

If it is wired to an accessories switch and or fuse panel that can create interference as well.
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#12510517 - 11/20/17 12:50 PM Re: Graph question [Re: T-Gauntt]
T-Gauntt Offline
Pro Angler

Registered: 04/02/12
Posts: 667
Loc: Sachse, TX
Wired direct to cranking battery. When I'm not stepping on the power button the graph reads perfectly clear. Fuse is not blown.

Is there a specific ferrite choke I'm supposed to use, and is there any specific place where it's best to install?
_________________________
-Taylor


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#12510531 - 11/20/17 01:14 PM Re: Graph question [Re: T-Gauntt]
Cast Online   content
TFF Celebrity

Registered: 07/31/12
Posts: 7024
Loc: North Texas - God's Country
Any ferrite bead will help. Always install near source of power.
_________________________
Cast



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#12510634 - 11/20/17 03:09 PM Re: Graph question [Re: T-Gauntt]
Wayne P. Online   content
TFF Team Angler

Registered: 11/16/10
Posts: 3859
Loc: Charlottesville, Va
Ferrites should be attached close to the equipment to filter any RFI that is picked up along the cable.

On a transducer cable just before the transducer plug, and on a power cord just before its plug.

https://www.oldwillknottscales.com/how-to-install-a-ferrite-bead.html

http://www.ni.com/pdf/manuals/321221a.pdf
_________________________
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1

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#12510638 - 11/20/17 03:14 PM Re: Graph question [Re: T-Gauntt]
Wayne P. Online   content
TFF Team Angler

Registered: 11/16/10
Posts: 3859
Loc: Charlottesville, Va
_________________________
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1

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