I read in !emc-pstc that Doug McKean <[email protected]> wrote (in <[email protected]>) about 'EMI guard bands', on Thu, 20 Dec 2001: >Anywho, the answer I got back from him was that >the limits were empirically derived in reference to >interfering with television signals. So, the worst >case (which turned out to be Class B) was a tv >back to back across a wall from another device >in an apartment complex.
I would be suspicious of that; it is a 'near-field' scenario, which means that the emission field strengths are complex and impossible to calculate. The Class B limits are related to a 10 m separation of source and potential victim, and that implies far-field conditions for emissions above about 5 MHz. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [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: No longer online until our new server is brought online and the old messages are imported into the new server.
