In message <[email protected]>, dated Sun, 23 Apr 2006, "Grasso, Charles" <[email protected]> writes >Anyone who tests for FCC compliance knows that there is an upper >frequency requirement that is basedon the highest frequency used. Does >anyone know why (for clocks >1GHz) the FCC picked the 5th harmonic as >the limit?
I think it was chosen at a time when no-one really knew how to do repeatable emission measurements from all sorts of equipment above 1 GHz. So to specify 5 GHz to, say, 15 GHz was quite ambitious. Even now, repeatability is not impressive. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. 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
