In message <201048ea81ba0745aca78e4cc8839001054c9...@desmdswms201.des.grplnk.net>, dated Fri, 3 Jul 2009, "Haynes, Tim (SELEX GALILEO, UK)" <[email protected]> writes:
>Radio FTL in ionosphere under "certain conditions" maybe so, but they >were not created to be FTL. You used the 'c-word'. I'm not getting into that!(;-) > >This article suggests that FTL radio can be created and this IS new (if >true). Not quite; the radio waves don't travel faster than light, they do something even more interesting (see below). What is superluminal is a phase pattern, and that is not very different from the phase pattern in a waveguide, which can also move FTL, in fact, I think it always moves FTL. However, even a leaky guide doesn't radiate in the same way as the curved dielectric antenna. > >So, if the world starts using FLT Radio, what new susceptibility >effects might it introduce in electronics? Well, I questioned that, but having read the paper, I know. The radio wave emissions DON'T obey the inverse-square law - the intensity decreases linearly with distance, so the limit of usable (or interfering) field strength can be VERY much further away from the source than with conventional propagation. That's why mobile phones might be able to talk directly to satellites. This effect also occurs with column loudspeakers, which radiate a flat, fan-shaped beam, and with any emission that is confined to two dimensions. > >Might we see rising edges with speeds of minus 1nS? :-) Only if you have some thiotimolene. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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]>
