How about finding an ethernet common mode choke and putting it between two RJ connectors in a waveguide?
Just my thought – they work when exiting products to keep the noise inside the Faraday cage. Should be simple enough to solder up then you just have to figure out how to mount it (or just tape it up really well) :-) -Dave David Heald EMC Engineer | Worldwide Regulatory Compliance tel: +1.631.738.5373 fax: +1.631.738.5520 _____ From: [email protected] [mailto:[email protected]] On Behalf Of McInturff Gary Sent: Wednesday, August 30, 2006 2:52 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 email has been scanned for computer viruses. ________________________________________________________________________ This email has been scanned for computer viruses. ______________________________________________________________________ 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 - ---------------------------------------------------------------- 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
