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schaefer(at)rts-services.
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nuckolls.bob(at)cox.net
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 Posted: Wed Nov 14, 2007 12:48 pm Post subject: Wire Layout Ideas |
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There are no practical limitations on proximity of
wires for the purpose of limiting exchange of
noises between wires. We don't do it on the
heavy iron and you shouldn't need to do it on
your OBAM aircraft either.
Bob . . .
At 11:50 AM 11/14/2007 -0600, you wrote:
| Quote: | Folks,
I would like some guidelines on how to distribute the following wires
through the fuselage to minimize interference:
1) #4 Battery Cables for rear battery
2) 2 GPS-Waas antennas
3) 1 XM Antenna
4) 1 Com Antenna inside the rudder.
5) Ray Allen Trim Tab
6) ELT
7) Master Relay
 Strobe/Position lights
I know I should keep the Com Antenna cable away from the GPS Antenna and
cables.
How best to distribute the rest &
This is a LancAir IV-P. Carbon Fiber fuselage & Fiber Glass Vertical and
Rudder.
Richard T. Schaefer E-mail:
<mailto:schaefer(at)RTS-Services.com>schaefer(at)RTS-Services.com
RTS Services Inc Web:
<http://www.rts-services.com/>http://www.RTS-Services.com
7330 Cave Hollow ___ Voice: (512) 923-2755
Austin, TX 78750 | Fax: (830) 798-9644
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Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Wed Nov 14, 2007 1:15 pm Post subject: Wire Layout Ideas |
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At 12:47 11/14/2007, you wrote:
| Quote: | There are no practical limitations on proximity of
wires for the purpose of limiting exchange of
noises between wires. We don't do it on the
heavy iron and you shouldn't need to do it on
your OBAM aircraft either.
Bob . . .
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Not even for Stormscope antenna proximal to 400Hz power and/or CFS
5kHz autopilot power lines?
The SS IM has pretty specific guidance otherwise IIRC...
Ron Q.
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fvalarm(at)rapidnet.net
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| Posted: Wed Nov 14, 2007 5:48 pm Post subject: Wire Layout Ideas |
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Bob,
By this do you mean to say, run all wires as is most convenient to the
install process?. I too was planning on separating antenna wires from mic
wires, and both from auto pilot wires, +/- power wires close together or
even twisted etc. Although I have not completely figured out how to do this
in an RV7. I just don't want ANY interference and have to re-wire to get
it. BTW I've never done this before. More advice please.
Bevan
RV7A wiring
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nuckolls.bob(at)cox.net
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| Posted: Wed Nov 14, 2007 6:26 pm Post subject: Wire Layout Ideas |
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At 05:46 PM 11/14/2007 -0800, you wrote:
Bob,
By this do you mean to say, run all wires as is most convenient to the
install process?. I too was planning on separating antenna wires from mic
wires, and both from auto pilot wires, +/- power wires close together or
even twisted etc. Although I have not completely figured out how to do this
in an RV7. I just don't want ANY interference and have to re-wire to get
it. BTW I've never done this before. More advice please.
Understand. Know that when we wire a BIG airplane,
the electro-wienies are at the bottom of the food
chain when it comes to space claims on board the
airplane. We get what's left over after fuel,
engine, flight, hydraulics and air-conditioning
are installed. The only time we had the luxury of
choosing to route THIS wire separate from THAT
wire was when the first electrical system went aboard
something like big honking radial engined machine
that offered relatively open spaces and few competing
systems.
Fortunately, systems designed for modern aircraft
have matured along with the airplanes . . . and
they're designed to run in happy co-habitation
with other systems. By design and qualification,
we craft devices that DO NOT require special
consideration from the installer to insure
harmonious communities potential victims
and antagonists.
The wild is replete with ol' mechanic's
hangar tales about how some intractable
interference problem was cured by separating
the bundles of squabbling systems. However, if
one tracks down root cause of the
symptoms, it's likely that one or both systems
lacked the pedigree to be installed aboard
aircraft . . . or cars . . . or boats. Or
some important instruction for installing one
of the systems was ignored.
It doesn't take long for a handful of real
problems (masked by the wrong solutions) to
morph into a body of sage advice from many
a wizened mechanic concerning the building
of "fences" between potentially recalcitrant
systems. While well intentioned, 99% of
what we hear has no basis in physics. Happily
for you (and for those of us still building
heavy iron) the inter-system squabbles are
pretty much taken care of at the factory.
Route your wires for convenience and good
craftsmanship. There's no automatic value
to be achieved by separating any wires based
on hangar legend.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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fvalarm(at)rapidnet.net
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| Posted: Wed Nov 14, 2007 7:04 pm Post subject: Wire Layout Ideas |
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Thank you very much. Onward and Upward !!
Bevan
--
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