In message <[email protected]>, dated Tue, 11 Dec 2007, [email protected] writes:
>We are considering placing an OATS on the roof top of a building for >some inhouse testing. Does anyone have any experince with OATS on roof >tops? They do exist. >To our lab we may be required to run 60' of cable from our antenna. >Does 60' sound too long? At 1 GHz, 6' is 'long'! Thinks again; you need a mini-lab (plastic dome) on the roof. >We would like to get good site attenuation out to 1GHz. Also any >suggestions on material for the ground plane would be appreaciated. >Since we will be running the grounding conductors before we can test >the site, we wonder if we should provide more than one ground >connection to the plane. Not sure what you mean by 'ground connection'. Any wire from a rooftop plane to the planet's surface is long enough to be an inductor of very significant impedance, and at 1 GHz it's a transmission line. You had better regard your 'ground plane' as a counterpoise to any common-mode emissions and ground it only for protection against lightning, i.e. with a lightning conductor. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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/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
