The limit for RE is based as I said in an earlier message on the television band rf signal level required to get a specified base band video signal-to-noise ratio. The fact that the interference coupling mechanism is near field is not important, except of course as it affects measurement technique.
---------- >From: "Doug McKean" <[email protected]> >To: "EMC-PSTC Discussion Group" <[email protected]> >Subject: Re: EMI guard bands >Date: Fri, Dec 21, 2001, 10:48 AM > > > "John Woodgate" wrote: >> >> 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. > > That's true, but weren't the early measurements for > Class B done at 3 meters? > > - Doug McKean > > > > ------------------------------------------- > 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. > ------------------------------------------- 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.
