I read in !emc-pstc that Gordon,Ian <ian.gor...@edwards.boc.com> wrote (in <E1BA0362B28ED211A1E80008C71EA3060206FB33@z- 160-100-30-252.est.ibm.com>) about 'RADIATED IMMUNITY REQUIREMENTS FOR EN61326' on Mon, 3 Mar 2003:
>Furthermore, I have never been able to work out why there is a relaxation at >these freqs. The wording from table 1 of EN61000-6-2 is ....10V/m........ >"Except for the ITU broadcast frequency bands (given above) where the level >shall be 3V/m". >Can anyone provide the "logic" behind this clause? (I'm sure there is >some!). The transmitter antennas are designed not to produce high field strengths even close to the antennas, because receivers would be severely overloaded and maybe damaged. I did some measurements on portable radios and, scaling up from what you get at the base of the first transistor with say 100 mV/m, you would get 1 to 2 V at 10 V/m, which could even damage the transistor. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
