Hello Gary,
May I suggest going to older Ethernet hardware? There are 10BaseT to
10Base2 Ethernet adapters. You may have to look in a computer resale shop
to find this older hardware. This will get you to the older 50 ohm coaxial
Ethernet connection. You should have no trouble getting the coax through
the wall. You will be limited to 10 megabits/second, but that may be
sufficient.
Ted Eckert
American Power Conversion Corporation
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"McInturff Gary"
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Subject
08/30/2006 01:52 Chamber transition panels
PM
Dumb question maybe
I have to get a UTP Ethernet connection out of a semi-anechoic
chamber. There no anti-chamber so any unfiltered cable routing opening is a
major leak because of the opening and the induced noise on the cable
itself. Since Ethernet signals don’t like to be filtered. I’m considering
two options – neither of them make me real happy.
1) Find, if one exists, some sort of metallic RJ-45 bulkhead
transition connectors and mount that into the transition panel. I’ve
seen the plastic versions for inter-connecting Ethernet cables, but
the were neither metallic nor bulkhead mounted.
2) Make an air dielectric waveguide out of foot or so ½ inch metal
pipe and attach that to the transition panel and route the cable
through the “wave guide” The opening itself even at ½ is larger than
18 GHz upper test frequency, but the width of the wave guide buys me
some attenuation – and I don’t expect to see much in the way of
ambient up that high anyway.
I don’t have an option of putting the test gear into the chamber with the
EUT. The test gear would be a worse problem.
I don’t think this is completely brain dead but don’t see any easier
solution, but this doesn’t address any induced ambient noise on the cable.
Your thoughts?
Thanks
Gary
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