nuckolls.bob(at)aeroelect
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 Posted: Thu Nov 16, 2023 4:04 pm Post subject: Power, signal, and Coax - How should they be bundled? |
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At 01:54 PM 11/16/2023, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
A trim servo position potentiometer is extremely unlikely to cause any
interference because the output signal changes very slowly as the motor
runs. When the motor stops running, the position signal is steady DC. |
<snip>
Exactly.
I might add that coax cables for radios are also
very low on the list for potential victim or antagonist.
The magic thing about coax is its ability to keep
signals on the inside IN; signals on the outside OUT.
This magic goes away should the shield connections
at the connector become undone. In these cases,
you might WANT the fault to raise a ruckus of some
variety with another system . . . else how would
you become aware of the need for maintenance? I've
only encountered a couple instances of loose shields
on a coax . . . and those involved UG-88 connectors with
threaded clamps. Crimped connectors are pretty immune
from this ailment.
Another consideration for making wire routing
decisions is the fact that potential victims
are largely confined to stuff behind the panel.
Even if gizmos scattered about the airplane
were potential antagonists (mostly not), they
don't share environs with the most vulnerable
systems behind the panel.
Everything off the panel will happily
coexist in wire bundles.
Bob . . .
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In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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