Lowering cockpit RF interference

wrote:
Hello all EEs.

What is standard operating procedure for when and where to use shielded wire in cockpit wiring?

What is standard operating procedure for when and where to use ferrite sleeves?

Do both the positive and negative lead need to pass through the ferrite sleeve?

Thanks for the education.

It can all be a bit trial and error, but
http://audiosystemsgroup.com/SAC0305Ferrites.pdf
gives some of the theory and practical aspects of it.

Key points:
- mount "close" to interference source
(close = less than 1/20th of the wavelength)
- mount "close" to whatever is being affected by
the interference
- multiple loops are better, usually
- resonance can cause surprises; be prepared to experiment
- any piece of wire can be an antenna, including the
cable shields