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987 interference #11920465 11/07/16 02:16 AM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11920515 11/07/16 02:50 AM
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44 Diesel Offline
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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.

Re: 987 interference [Re: 44 Diesel] #11920845 11/07/16 01:54 PM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11921219 11/07/16 05:01 PM
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UJC Offline
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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.

Re: 987 interference [Re: UJC] #11921360 11/07/16 05:58 PM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11921365 11/07/16 06:00 PM
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Bobby Milam Offline
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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

Re: 987 interference [Re: Bobby Milam] #11921559 11/07/16 07:34 PM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11923768 11/08/16 10:31 PM
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UJC Offline
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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.

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



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Re: 987 interference [Re: Mike Keenan] #11923949 11/09/16 12:32 AM
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Bobby Milam Offline
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Here is a video of the ring and how to use it.
https://www.youtube.com/watch?v=EM3xNctWaO4

Re: 987 interference [Re: Bobby Milam] #11935281 11/15/16 04:44 PM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11947216 11/23/16 02:28 AM
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Mike Keenan Offline OP
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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.
www.basscat.com

Re: 987 interference [Re: Mike Keenan] #11947233 11/23/16 02:38 AM
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They don't go bad. Do the proper wiring first then go from there. Keep all ff cables away from trolling motor power cables

Re: 987 interference [Re: 44 Diesel] #11947740 11/23/16 02:09 PM
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Mike Keenan Offline OP
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As I figured, thanks


R.I.P. Mike "pappy" "broken rod" Green born 07-16-62 on to better fishing 06-10-08.
www.basscat.com

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