I think Gert's analogy of PLC is excellent. If anyone is interested in finding out more about problems it can cause please check out this section of The EMC Journal http://www.compliance-club.com/default.aspx?id=17
Cheers Alan E Hutley Editor The EMC Journal www.theemcjournal.com From: ce-test, qualified testing bv - Gert Gremmen [mailto:[email protected]] Sent: 18 May 2010 6:55 AM To: [email protected] Subject: Re: [PSES] CE Standard for Power Lines data Transmission System There is no way of transmitting PLC (power line communications) signals at a usable signal level without severely interfering with wireless HF communications. Why else do you think we invented the coaxial cable to "transport" RF-signals ?? PLC has shown to be a mix of conducting and radiating HF close field signals with mutual coupling between multiple wire sets insuring signal continuity between sender and transmitter. At the proposed levels of signal (105 dBuV +) and power line density all of the residential areas will be virtually full of noise. I believe that PLC systems need to be treated as intentional radiators (=transmitters). Distributing HF signals by PLC can be compared with distribution of crude oils by the leaking platform in the gulf of mexico. The oil will arrive at its destination port ..... once ! And with the economic advantage of saving oil tankers or pipe lines. Gert Gremmen Ce-test, qualified testing bv Van: [email protected] [mailto:[email protected]] Namens John Woodgate Verzonden: maandag 17 mei 2010 22:18 Aan: [email protected] Onderwerp: Re: CE Standard for Power Lines data Transmission System In message <5DF40095BBDD4BD1A518F1F8EE4C6440@dell27c5040f40>, dated Mon, 17 May 2010, John Allen <[email protected]> writes: >I am surprised we have heard nothing from Mr Woodgate on this issue - I >think he has very strong views on the whole PLT issue! My message is already there; you just have to find it! My 'strong view' is that we **need to be clever enough** to make it work (because the economic benefits could be very large) while not compromising wireless communication in the HF band (because that's economically important, too). What isn't at all clever is to pretend that emissions tens of dB above current limits are harmless, and neither is an insistence that those current limits are some sort of natural law that cannot be adapted at all. -- 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]> - 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]> - 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]>
