Gary, David
LAN manufacturers typically insert an RF-clean Ethernet hub between EUT and
AE. You can use the ferrite decouplers of EN 55022 A2:1998 to suppress
emissions from the hub.
.
Honeywell
David W. Sterner
Quality Assurance Engineering
Security & Custom Electronics
165 Eileen Way
P.O. Box 9035
Syosset, NY 11791
Phone: (516) 921-6704 x6970
Fax # (516) 364-6953
[email protected]
<http://www.honeywell.com <http://www.honeywell.com/> >
[email protected]
<http://www.IEEE.LI <http://www.ieee.li/> >
Electromagnetic Compatibility
IEEE 05888136
From: [email protected] [mailto:[email protected]]On Behalf Of Garnier, David
S (GE Healthcare)
Sent: Wednesday, August 30, 2006 7:13 PM
To: McInturff Gary
Cc: [email protected]
Subject: RE: Chamber transition panels
Gary,
There are RJ45 fiber optic converter boxes out there. In the past, we have
used "black box"
fiber converter boxes. Note, they were screamers and we spent lots of time
trying to quiet
them down, (sanding all painted mating surfaces, adding FB's, etc.) Not fun
when you have
to do real work.
Maybe someone else has a better RJ45 fiber optic converter box.
Regards,
Dave Garnier
_____
From: [email protected] [mailto:[email protected]] On Behalf Of McInturff Gary
Sent: Wednesday, August 30, 2006 1:52 PM
To: [email protected]
Subject: Chamber transition panels
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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