ferite beads?

[thrmaln]

Hello All,

I have a sailplane that is giving me hell with an intermittant glitch. I am slated to fly this plane in a Large contest this weekend. The glider is mainly carbon fiber so I have the antenna wire on the outside of the plane. Unfortunately, I have made the wiring harness out of standard hitec servo wire rather then the twisted type which would of probably helped. Anyway, I have decided to give ferite beads a try. I have 6 servos, do I need 6 beads or can I use one large one for all the wires entering the receiver? Any help will be greatly appreciated.

Best regards,

Marc Webster

[AndyOne]

Marc,

I suspect the problem is carbon to carbon noise rather than servo lead length. If there are carbon parts that are allowed to touch eachother and they move or otherwise scrape together this can be just as bad as metal to metal noise, carbon is conductive, you know. Make sure if there are any carbon parts than move over each other to either insulate them from each other or electrically bind them together. Either of these approaches will cure this kind of noise.

Incedentally, I have used a single large bead over several servo leads but only as a precaution not as a cure for any particular problem.

Andy.

[Terry S]

On the same subject, I saw an add for 'noise sink' on this site, dose anyone know if it is any good and if so how dose it work ?

Terry

[Comatose]

As far as I can tell its just a ferrite chip with servo leads. Whether it works or not I can't say. Theoretically it should get you about the same as using a ferrite core and winding the leads a few times.