Hey Will;
If you place groups of wires together...twist them as "pairs"
separately, i.e. B+ and B- (ground) together, and each pair of signal
+ and signal - (charge firing) together, and so forth. IDEALLY if you
then are forced to place these pairs adjacent to one another AND they
have a slightly different twist "rate" (amount of twist per
"unit-of=-measure") things will be as good as you can get.
("Crosstalk" between pairs will be minimal as you can make it.)
In the confines of a "electronics bay" this may seem a lot more
theoretical than useful, but it forms good engineering practice, and
ignoring the above rules completely can contribute to an "ebay cato".
How so:
When so twisted the wires can "take shape" so that the
printed-circuit-board can be held in place by the wiring alone. So
when the brunt of excessive g forces breaks the plastic screws you
used for mounting (I know, everyone is a perfect flyer, so taking
"hard landings" into account may seem "excessive".....grin.), you now
have a chance of recovering a working unit....... !! (Ask me how I
know.....er, um, another time please !)
Anyways, my input......hope it helps you fiqure this out.
Fly high, fly fast, fly safe....not nec. in that order.
VERY best regards;
Baab F.
P.S... Shielding is not as useful as twisting on "balanced" circuits
when considering coupling between each (non-coaxial) wire (or circuit)
-pair, This is due to the lack of a third (tertiary) path on these
two-wire circuits.
On Sun, Dec 6, 2020 at 11:36 AM Will Marchant
<[email protected]> wrote:
>
> Hi Folks:
> Any "rules of thumb" about how much twisting to do of the various
> avionics wires?
>
> One turn per inch? More? Less?
>
> Thanks in advance for any advice!
> Happy holidays,
> Will
>
> --
> Will Marchant, KW4WZ
> [email protected]
> http://www.spaceflightsoftware.com/will/
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