Ken, John thanks for your postings (and previous postings over the last year). Pretty much all of what you say is what I have experienced in experiments that I have conducted so far. I am interested in doing two further tasks but I have not really thought about them in detail.
Firstly I plan to do a subjective assessment of mutual interference whilst also measuring using a loop and a whip. I recently had some PLT equipment running at home and could jam a good quality broadcast from the Netherlands (I think) if the HF receiver, with a low quality antenna, was within about 3m of my house. The aim is to try and bring together the measurement of quantitative values and their real life effect. Secondly I would like to model my house with NEC, but I am just learning how to use the software so it may take me some time. My initial sketches of a simplistic model are still pretty complex, and I haven't even considered any mains loading. Iain From: "John Woodgate" <[email protected]> To: <[email protected]> Sent: Friday, March 18, 2005 4:14 PM Subject: Re: Broadband Communications over Power Lines In article <be603c03.20590%[email protected]>, Ken Javor <[email protected]> writes > I don't know how BPL really works in detail In Europe, the RF signal is applied in differential mode between the two power conductors (neutral, which may be grounded in various different ways or not grounded at all) and line 230 V 50 Hz). It stays substantially differential for oh, about 10 m or so! Beyond that, the cables radiate - ALL of the cables. So the field pattern, inside, and even immediately outside, a dwelling, is fearfully complex. This applies, of course, regardless of whether the inhabitants subscribe to the BPL service or not. >but there are a few > basic physical principles that apply regardless: An excellent resumé. -- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except 'What is a Moebius strip?' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
