In message <[email protected]>, dated Tue, 25 May 2010, Cortland Richmond <[email protected]> writes:
>I have certainly not bought any for myself, and I am ready to deal with >conducted emissions from neighbors' via my street's common MV power >with a 200A facility EMI filter at my own dwelling's power entry. Conducted emissions per se are rather beside the point. The threat is seen from radiated emissions from wiring due to mode conversion from differential to common mode by impedance discontinuities in the wiring. This is why proposals to control the common-mode emissions from modems into balanced loads are frankly fraudulent. For safety reasons, the modem output is transformer coupled, and the secondary winding is floating. So there is virtually no common-mode emission. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK I should be disillusioned, but it's not worth the effort. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
