Gary, I think the waveguide will work well to keep emissions from entering through the aperature. I would add ferrites to the Ethernet cable at the shield room opening to strip off the common mode energy. Bill
_____ 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 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
