Depth/Transponder probs - suggestions

Jeff Quigley

Petty Officer 2nd Class
Joined
Aug 21, 2004
Messages
109
Firstly, I've repost this from another iboats forum.<br /><br />Here's my problem. I Installed a depth/fish finder this year (more for depth as I don't fish that much). My plan was to install the transponder on the transom but the the connector was just over a 1/4 inch and I didn't want to drill a honking huge hole in the transom. The instructions also said not to cut the wire... sooo... I Decided on "option 2" in the instructions which was to mount it internally using slow set epoxy. Everything worked out great. Turned on the unit and it read the depth and I was seeing fish while docked at the slip. Even used a pole to confirm that it was reading the proper depth.<br /><br />Last night I started up the engine and then noticed the depth reading at zero feet. Strange... then it jumped to 340 feet! I'm thinking engine vibration is the culprit. I opened up the floor access and checked the transponder. Solid. In the same position and has not come lose. The instructions said to use slow set epoxy so that there were no air bubbles. I didn't see any upon examination.<br /><br />So, if that's not a pain in the rear, I then noticed when I turned on the stereo I was picking up the sonar pulse through the speakers. Arrrrg!<br /><br />Anyone ever run into these probs and what did you do to fix it? That transponder is pretty solid in place! <br /><br />Jeff<br /><br />PS. just to get the ball rolling, Flashback made this comment on my post.<br />----<br />Jeff, I would guess that the eratic behaviour is caused by electrical interference rather than vibration. I would try to separate the fishfinder wiring as far away as possible from any other wiring. one common mistake folks make is bunching wires together with ties and such. fish finders do not like that.. good luck.. by the way you may get more responses for this in the electronic forum...one of the moderators will probably move it...<br />----
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: Depth/Transponder probs - suggestions

I think what Flashback said is correct. You need to either move the wires so they are farther apart or get a filter at radio shack to cancel the noise. This is a pretty common problem. You may need a filter on your radio and your ignition..
 

chuckz

Chief Petty Officer
Joined
Aug 22, 2004
Messages
625
Re: Depth/Transponder probs - suggestions

If it happened after you started the engine, your transducer wire is probably too close to the tach signal. That would interfer with the depth reading. The noise in the radio may be coming in either on the power leads or on the antenna leads. Whichever leads are closest to the transducer cable, move them.
 

Gail Wrede

Cadet
Joined
Jun 1, 2006
Messages
9
Re: Depth/Transponder probs - suggestions

Check all your grounds and make sure that not corroded
 
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