Your assertion that to be effective a shield must be a magnetic material got
me to thinking about Gaussian surfaces, a concept learned a rather long time
ago during four long (mostly boring) semesters of physics as an
undergraduate in engineering. While I may have nodded off during the
important moments I do recall that a Gaussian surface merely had to be
conductive to provide shielding. Ergo, aluminum is an effective shielding
material according to theory, and in fact shielded cables frequently use
aluminum foil for just that purpose. By definition a Gaussian surface is a
closed surface, but things like wires tend to be long and thin making for a
good approximation.
Should I have failed to grasp the theory perhaps someone who enjoyed (rather
than endured) physics will enlighten me (and other readers as well).
Best regards,
Rob Housman
A070
-----Original Message-----
Behalf Of Bob Harrison
Subject: Re: Bundling of coax cables
....
Also remember that aluminium has no capacity to shield magnetism ,like if
you put a sheet of metal across the rear of the bulkhead it needs to be thin
gauge stainless, or you'll need to buy 5 litres (minimum order) of Nickle
Based paint at about 200 a go !!!!
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: forum-owner@europaclub.org.uk
Subject: Bundling of coax cables
Hi Europa-cracks,
The cable ducts from the rear fuselage to the instrument panel will be one
of the next steps of my building activity. Before I start to do this, I'd
like to know if there is a problem when I put the coax cables into the same
cable duct. I use RG-400U for the transponder and the comm antennas and
RG-58U for the VOR antenna. Do these coax cables interfere with each other
when they are in a bundle? Any experiences and technical explanations from
the electronic knowledge blessed among us?
Alfred Buess
#097 Monowheel 912S
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