Vexilar FL-22 Manuel d'utilisateur télécharger pdf (Page 49)

Electrical Interference

There may be situations where you experience interference from other electrical devices,

not just another nearby depth sounder. This interference will show on your display as

random signals which can appear anywhere. They will interfere with your ability to see

the normal display signals. The most common sources of interference are electric trolling

motors and engine ignitions systems. The Interference Rejection feature will not have

much effect on these types of interference, as this feature is designed to only deal with

signals from another sonar device. Here are some things to be aware of when it comes to

electrical interference.

So U r C e S

Interference can be introduced into your sonar system through the power supply, transducer

line, or both. To identify the source, unplug the transducer and run the trolling motor or

the engine. If the interference disappears, you know the noise is coming in through the

transducer line. If not, it’s coming through the power line, or both.

wi r i n G

Power line interference can generally be solved by improvements in the wiring positions,

connections, and grounding. You want to be sure the sonar wiring is as far away as

possible from the trolling motor wiring, and the wiring is neat. Make cable runs as short

as possible and neatly coil extra wire and tie it off so it stays put in rough water or

while pulling the boat. All electrical connections should be in very good condition. Push-

on terminals should be tight. Wire crimp connections should not come free when pulled

ﬁrmly. Conductors should be shiny, not dull or corroded.

Gr o U n d i n G

The boat’s electrical system should have a common “Earth” ground to the water. Most

boats electrical systems are grounded through the outboard to the water. Many times a

electric trolling motor interference problem can be solved by a “ground” wire from the

negative trolling motor power source to the negative of the starting battery.

eq U i p m e n t

Electric trolling motors and gas engines can have technical problems that can cause

interference. If common wiring improvements do not solve the problem, be sure to check

with the manufacturer to see if there are any recommendations or updates available

regarding interference with depth sounders.

For more information regarding interference issues, check the Support section of the

Vexilar web site or contact our service department.

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Vexilar FL-22 Manuel d'utilisateur Page 49