Thread: Isolating RFI noise

What ya posed ta do wif it if ya do find static??

Is there any type of shielding that would take care of it?

once you find which wire is giving you the static you can put a rfi filter on that wire

If you are having Interference on a Humminbird Fishfinder you can contact our customer service group and give them your setup and we will send you out a kit that will take care of the interference. Humminbird Customer Number is 800-633-1468.

There are specific items on your boat that generate static noise and transmits through the wires to the rest of your circuits. Electronics are the most sensative, like your depth finder.

Your trolling motor(s) and boat motor(s) both generate noise and they both need to be wired directly to yhe battery and not part of any other circuit.

Also make sure your wires dont run near the motors, they create a magnetic field that will penetrate teh wire sheath and introduce noise to your clean circuit. Clean being connected directly to the battery.

If oyu have a Marine Radio, equvilent to a CB radio, you must make sure this is also on clean power and specifically away from static noise sources. They dont handle the noise well and it severly affects the distance you can transmit and receive.

If oyu can, seperate the trolling motor wires away from teh rest of your wires. Use the automotive wiring looms. Its slit down teh side from one end to the other and will slide over your wires where they lay.

Another source of noise is your pumps, livewell, airator, bilge, seperate clena circuits from yoru sensative electronics.

Most poeple have one power wire running from the battery to a terminal block and everything is connected to teh terminal block. Taht block just connected all your circuits and non of them are getting clean power. Put your trolling motor on its own circuits back to teh batteries. Put your dc motors, pumps, on there own circuit and back to the battery or common terminal block to those circuits. Put your sensative electronics on thier own circuits and back to one clean terminal block, back to the battery. Same with the grounds/negative side of things.

That will filter out 99% of your noise problems. If you still have interference, use a filter at each device you need to protect.

TM is on it's own battery with nothing else connected. All other electrical is rigged to other battery. Boat motor directly to Battery. Then two other sets of wires, one for port and the other for starboard. I no need no stinking circuit board. Each set fused at the battery, then spliced with junctions. Only noise I get is when I fart. (Tell the kids it's a fish call) Thanks for the info, I'll know what to look for should I have trouble.

If your TM is on a separate battery and your TM is bolted to an aluminum boat, you still have a possible ground loop which can induce noise. MOAO

Prove me wrong anyone?

Originally Posted by Cane Pole

If your TM is on a separate battery and your TM is bolted to an aluminum boat, you still have a possible ground loop which can induce noise. MOAO

Prove me wrong anyone?

Nylon bolts, TM base insulated

From a old old Ham radio Op. Ground it and shield it. If that doesn't work then add a RFI fillter. And yes those old transistor AM radios are a great tool. Even take one with me Crappie fishing just to past the time and keep track of the weather when I am out on the river.

Redman

Originally Posted by Crappie Reaper

Nylon bolts, TM base insulated

Good boy.