What would be considered worst case? A bicon - log periodic pair, or a bilog hybrid? I think the less directional the antenna, the worse the uniformity may be, but, I'm no expert on antennas. Bob R.
--- On Thu, 8/26/10, John Woodgate <[email protected]> wrote: From: John Woodgate <[email protected]> Subject: Re: Field Uniformity Calibration per 61000-4-3 To: [email protected] Date: Thursday, August 26, 2010, 2:57 AM In message <1347744851.367114.12827814 [email protected] <http://us.mc565.mail.yahoo.com/mc/comp se?to=1347744851.367114.1282781476042.J [email protected]> .comcast.net>, dated Thu, 26 Aug 2010, [email protected] <http://us.mc565.mail.yahoo.com/mc/[email protected]> writes: > Shouldn't the chamber user's antenna be used for the field-uniformity test? Otherwise I don't see how the results would apply if a different Tx antenna is later used. The radiation cahracteristics, including the coupling with the chamber, will be different. I think so, too, but there are possibly two stages: - check the chamber for freedom from non-uniformity [1] using a reference antenna; - check that acceptable uniformity can be achieved with the user's antenna. [1] e.g. due to one or more quasi-specular reflections. -- 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 If at first you don't succeed, delegate. But I support unbloated email http://www.asciiribbon.org/ - ---------------------------------------------------------------- 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] <http://us.mc565.mai .yahoo.com/mc/[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] <h tp://us.mc565.mail.yahoo.com/mc/[email protected]> > Mike Cantwell <[email protected] <htt ://us.mc565.mail.yahoo.com/mc/[email protected]> > For policy questions, send mail to: Jim Bacher: <[email protected] <http: /us.mc565.mail.yahoo.com/mc/[email protected]> > David Heald: <[email protected] <http:/ us.mc565.mail.yahoo.com/mc/[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]>
