nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Oct 21, 2010 4:20 pm Post subject: MGL Avionics - Clip on ferrites for radio noise suppressio |
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At 01:08 PM 10/21/2010, you wrote:
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Does anybody have first hand experience with the MGL ferrite beads
or clip on ferrites for radio noise suppression?
They seem to be a good added insurance during installation for EMI
suppression for VHF frequencies... and not very expensive.
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Assuming that the components of any particular suite
of avionics were designed and tested for use aboard
aircraft, then sprinkling ferrite beads on the bundles
to fend of 'gremlins' is about as practical as sprinkling
Transorbs on all wires to ward off 'spikes'.
There is no such thing as a totally quiet system . . . nor
is there a device that is immune from all levels of electro-
magnetic pestilence. But in a century of crafting electro-
whizzies for airplanes, a very comfortable balance has been
achieved between LIMITING the about of garbage a potential
antagonist produces paired with designing potential victims
for certain degrees of robustness. See:
http://www.aeroelectric.com/articles/Philosophy/Whats_all_this_DO160_Stuff_Anyhow.pdf
http://www.aeroelectric.com/articles/avmaster.pdf
So assuming further that the combination of equipment you're
installing has a successful service history in other
airplanes when installed per instructions, then likelihood
of encountering a noise problem is low. If a noise problem
IS discovered, it's almost bound to have roots in (1) poor
installation practices or (2) improper design for either
the victim or antagonist.
RFI beads are the least likely cures for 99+ percent
of all noise problems. I've never found them useful
on an airplane. I've never heard or read of anyone
including such devices in the elegant solution for
a system installed aboard any type certificated aircraft.
Bob . . .
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