nuckolls.bob(at)aeroelect
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 Posted: Fri Sep 14, 2012 10:54 am Post subject: cable noises |
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At 11:14 AM 9/14/2012, you wrote:
Hello Bob,
I don't really know if I'm writting this message to the right
address, I actually wanted to post a message in the general forum but
haven't figured out how to do so; so this is why I'm writing you.
I see you're already signed up for a number of
lists on matronics. You've probably discovered that
you can join a conversation by simply replying to
a message. You can start a new one by simply sending
your query to aeroelectric-list(at)matronics.com
This will start a new conversation titled with what
ever words you put in the subject line.
I'm a builder of an RV7A in Spain and just wanted to ask for some
advise regarding the way that the antenna cables need to be routed
inside the plane. In other words, I know that big pulses like the
strobes will generate noise in the antena cables if they come close
enough, but what about bundling several antenna cables together like
the VOR, coms, gps and marker for example; can they interfere each
other or cause noise to each other? Also besides the strobe power
cables, what other cable should run far enough from the antenna
cables typically, and also what is "far enough" reasonable?
Actually, there's no practical value for separating properly
installed coax cables from other properly installed system
wires. In the heavy iron airplanes, every system installer
will fight tooth and nail to secure space and volume in
the airplane for his task. Wires running from one place to
another MUST join with wires from any and all other systems
who have found favor with the airframe turf-gods.
Artfully designed and installed systems for aircraft will
happily co-exist both for location of black-boxes and
airframe wire routes. So bundle your wires for convenience and
judicious used of space and $time$. If you find that you
do have a problem, it's generally easier to fix the
errors of installation than to put a band-aid on it
(repositioning, ferrite beads, filters, etc.).
Use good coax. RG-400/141/142 or LMR-195 and good practice
for termination. You've got a 99.9% probability of being
golden.
Bob . . .
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