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Author Topic:   Fishfinder Interference
djtdmd posted 11-23-2009 10:44 PM ET (US)   Profile for djtdmd   Send Email to djtdmd  
I have a 255 Conquest with a Northstar 6000i. The sounder or fishfinder is getting some vertical interference lines, or spikes as I think they are called. This happens only when the engines are running, no problems otherwise. I have read about the transducer cable being too close to power cables and such. I have an Airmar P66 transducer, recently re-mounted by Whaler technicians. Any ideas as to how to solve this problem would be greatly appeciated. Thanks a lot! Dan
jimh posted 11-23-2009 11:27 PM ET (US)     Profile for jimh  Send Email to jimh     
Dan--The best way to reduce interference with your SONAR signals from the power or control harnesses of your engines is to physically separate the the SONAR cable from any bundle of cables running from the transom to the helm.

I would examine the route the SONAR cable takes from the transducer to the SONAR unit, with an eye to keeping it isolated and away from other cables. Try a test with the SONAR cable run loosely to the head unit and away from all other cables.

Also, it may be possible that some interference is being conducted into the power distribution wiring. To test for this, bring a separate 12-volt battery onboard. It can be a small battery, as you only need enough power for a few moments of testing. Connect the SONAR unit directly to this separate battery, and unlace its power cable from any bundle. Observe the unit to see if this affects the interference. If the interference decreases when running on an isolated battery, you should install some power de-coupling and filtering components in the feed to the SONAR.

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