nuckolls.bob(at)aeroelect
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 Posted: Thu Nov 16, 2023 9:31 am Post subject: Power, signal, and Coax - How should they be bundled? |
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At 06:43 AM 11/16/2023, you wrote:
| Quote: | | In general, I agree with Bob that this issue is overblown by some, but I am not quite as cavalier as is Bob in this regard. I don’t have any experience with aircraft wiring, but I do have 30+ years of experience with industrial controls and data acquisition and we had a lot of issues with EMI/EMC and noise over the years. |
As have I. The majority of my 'fire fighting' tasks
in airplanes involved EMC issues. But not once did
I encounter a problem that was resolved by resorting
any wires in their respective bundles.
Every problem had roots in poor integration
practices by the SYSTEM designer (ground loops,
bonding, etc), craftsmanship (pushed back pin,
broken shield ground, etc) -or- fundamental
errors or omissions in the performance of the
appliance (like those generator controllers
and annunciator signal conditioners in the
HB800). The 'fix' always went to correcting
shortcomings in the appliance . . . never
needed to move a wire to a different bundle.
Discovered many issues having root cause in failure
of some presumably 'qualified' appliance to comply
with legacy functional and/or environmental issues.
It's too bad that Garmin would include that
broad-brush, boilerplate narrative in their installation
manuals. But yeah, one is well advise to
hold lawyers at arms length with as many magic
words as justifies their salaries in corporate
legal departments.
Have you noticed that the first several to many
pages of instructions for a new purchase include
a library of warnings, do's and don'ts some of
which are not even applicable to how the product
works?
The 'Connection is in need of some serious
updating. I'd like to get started on that pretty
soon . . . not getting any younger!
Bob . . .
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(o o)
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< Go ahead, make my day . . . >
< show me where I'm wrong. >
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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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