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#11920465 - 11/06/16 08:16 PM 987 interference
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
I was using my buddies boat today and he has two 987's on his boat. The one on the console works like a champ but the one on the bow gets all distorted when you activate the minn Kota trolling motor. It goes from reading normal depth to 250' then back to normal as soon as I let off the button and I know I didn't find a drop off...
any thoughts, concerns or what I should look at to figure this out? It's a pain in the butt
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11920515 - 11/06/16 08:50 PM Re: 987 interference [Re: Mike Keenan]
44 Diesel Online   content
TFF Team Angler

Registered: 12/25/12
Posts: 4394
Loc: Burleson,TX
RF interference, the possible fixes are endless. First make sure the graphs are not wired to the trolling motor batteries. Make sure all transducer and power leads are not touching the trolling motor power leads. Has this been an issue for a while or just start. What model trolling motor are you using. What transducer are you using an external or a US2 inside the trolling motor? Some minn kota trolling motors have a fuse inside the head for this reason.

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#11920845 - 11/07/16 07:54 AM Re: 987 interference [Re: 44 Diesel]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
It's a Minn Kota maxxum and it's an older trolling motor too. As far as I know it's been going on for a while. This was the first time I took out the boat.
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11921219 - 11/07/16 11:01 AM Re: 987 interference [Re: Mike Keenan]
UJC Offline
Extreme Angler

Registered: 01/12/07
Posts: 1950
Loc: Plano, TX
I found ferrite rings to be effective on HBs. I called HB years ago when I had a bird and they shipped it gratis. RF disappeared.
_________________________
LIVE PURPLE LOVE GOLD
Jimmy

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#11921360 - 11/07/16 11:58 AM Re: 987 interference [Re: UJC]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
Where can I find these ferrite rings?
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11921365 - 11/07/16 12:00 PM Re: 987 interference [Re: Mike Keenan]
Bobby Milam Offline
Extreme Angler

Registered: 07/13/14
Posts: 2614
Loc: Arlington
Humminbird sells them but they are proid of them. I will eventually just run to radioshack and grab a couple. They are pretty cheap there

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#11921559 - 11/07/16 01:34 PM Re: 987 interference [Re: Bobby Milam]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
You just clamp the rings on the power and transducer cables right?
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11923768 - 11/08/16 04:31 PM Re: 987 interference [Re: Mike Keenan]
UJC Offline
Extreme Angler

Registered: 01/12/07
Posts: 1950
Loc: Plano, TX
I don't recall which cable I placed the HB ferrite ring on. But I went to Radio Shack and bought two more. I now have Lowrance at the bow. I place each ferrite on power, sonar and another cable I don't recall.

Visit this HB page . It should be useful for HB and other brands.
_________________________
LIVE PURPLE LOVE GOLD
Jimmy

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#11923822 - 11/08/16 05:04 PM Re: 987 interference [Re: Bobby Milam]
Wayne P. Offline
TFF Team Angler

Registered: 11/16/10
Posts: 3679
Loc: Charlottesville, Va
Originally Posted By: Bobby Milam
Humminbird sells them but they are proid of them. I will eventually just run to radioshack and grab a couple. They are pretty cheap there


Humminbird has the TMC-1 that attaches to the trolling motor power cord.

_________________________
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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#11923949 - 11/08/16 06:32 PM Re: 987 interference [Re: Mike Keenan]
Bobby Milam Offline
Extreme Angler

Registered: 07/13/14
Posts: 2614
Loc: Arlington
Here is a video of the ring and how to use it.
https://www.youtube.com/watch?v=EM3xNctWaO4

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#11935281 - 11/15/16 10:44 AM Re: 987 interference [Re: Bobby Milam]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
Thanks guys, since my buddy is not inclined to do the work, I guess I get to work on it...
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11947216 - 11/22/16 08:28 PM Re: 987 interference [Re: Mike Keenan]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
Will these ferrit rings go bad? There's one on his transducer cable now.. or maybe should he do the much needed update and hook the front fishfindee to the cranking battery?
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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#11947233 - 11/22/16 08:38 PM Re: 987 interference [Re: Mike Keenan]
44 Diesel Online   content
TFF Team Angler

Registered: 12/25/12
Posts: 4394
Loc: Burleson,TX
They don't go bad. Do the proper wiring first then go from there. Keep all ff cables away from trolling motor power cables

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#11947740 - 11/23/16 08:09 AM Re: 987 interference [Re: 44 Diesel]
Mike Keenan Offline
TFF Celebrity

Registered: 10/31/04
Posts: 9837
Loc: San Diego, Ca/ Sanger, Tx
As I figured, thanks
_________________________
R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.


817-673-2102

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