That sounds like an excellent suggestion to me. It does raise one unrelated question in my mind, because I know little about Ethernet. This is just for my own understanding, it doesn't bear on the original post. Why is it you can get 100 MHz on "phone-line" type Ethernet cable, but only 10 MHz when on coax? Seems like it ought to be just the reverse.
> From: [email protected] > Date: Wed, 30 Aug 2006 20:23:52 -0500 > To: [email protected] > Cc: [email protected] > Subject: Re: Chamber transition panels > > 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 > > The items contained in this e-mail reflect the personal opinions of the > writer and are only provided for the assistance of the reader. The writer > is not speaking in an official capacity for APC nor representing APC's > official position on any matter. > > > > "McInturff Gary" > <GMcInturff@spray > cool.com> To > Sent by: <[email protected]> > [email protected] cc > > 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 don¹t like to be filtered. I¹m 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. I¹ve > 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 1Ž2 inch metal > pipe and attach that to the transition panel and route the cable > through the ³wave guide² The opening itself even at 1Ž2 is larger than > 18 GHz upper test frequency, but the width of the wave guide buys me > some attenuation and I don¹t expect to see much in the way of > ambient up that high anyway. > > I don¹t have an option of putting the test gear into the chamber with the > EUT. The test gear would be a worse problem. > I don¹t think this is completely brain dead but don¹t see any easier > solution, but this doesn¹t 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 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
