>Bob, does this mean that if I want a turn co-ordinator I should plan a noise
>filter from the begginning?
No, please don't add a filter just 'cause someone else
has reported a problem . . . you only need to do this IF
your sure your situation is identical to the other guy's.
A builder called me about 10 years ago and spent about
5 minutes describing all the shielding and filtering he'd
done on his airplane and then asked, "What else do I need?"
I asked, "Gee, I dunno, what kind of noise problem do you
have".
"Oh," sez he, "No problem, I haven't flown the airplane
yet."
He had hours, dollars and pounds invested in noise abatement
techniques that vast majority of which he probably didn't
need.
If your T/C is a KNOWN antagonist, meaning that a number
of people have the same make and model and fixed a noise
problem by adding a filter, then it's a good bet that you'll
need it also. But lacking that kind of situation, don't
hang filters on things until a problem manifests itself
and you've identified source, propogation path, and victim.
(See chapter on Noise Abatement in my book).
>Also, does the Navaid autopilot/turn co-ordinator need one too?
I've not heard of anyone needing to filter the Navaid. (Has
anyone else out there been aware of a Navaid noise problem?)
>Can two devices share the same noise filter?
Sometimes . . . but remember that a single power source
for two devices makes them vulnerable to single points
of failure for both devices. One device craps and takes
out the fuse for both.
Bob . . .
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