I don't know if this helps... Europe has standards for short range devices such as EN 300330 and country exceptions listed in ERC Recommendation 70-03. Although this standard is for inductive loop systems, it is interesting to note that the allowed level drops off like a cliff at 135 kHz. I understand this is due to licensed services (LF broadcast??)in this valley of the spectrum. I have also heard that a carrier in this band above 135 kHz is just not allowed...
In some bands, emissions are distinguished as spurious or carrier. Spurious is allowed (less than a given level) whereas intentional transmission is not. This appears to be one of those bands. Don Umbdenstock Manager Compliance Engineering Tyco Safety Products / Sensormatic 6600 Congress Avenue Boca Raton, FL 33487 USA 561.912.6440 [email protected] From: Robert A. Macy [mailto:[email protected]] Sent: Tuesday, July 12, 2005 11:52 AM To: John Woodgate Cc: [email protected] Subject: Re: Radiated emission measurement below 30MHz It radiated an ELECTROSTATIC field. We're talking voltage field of 100V at 150KHz. A little 1 inch wire poked out with 100 V on it. Current was the load of the parasitic capacitance around 10pF. You can't even see that 10 m away Yet, not allowed, go figure. - Robert - On Tue, 12 Jul 2005 05:33:29 +0100 John Woodgate <[email protected]> wrote: > Robert A. Macy <[email protected]> wrote (in > <[email protected]>) about 'Radiated emission > measurement below 30MHz', on Mon, 11 Jul 2005: > >Is this allowed? > > > >It was my understanding that one of my clients tried to > get a *very* low power intentianal "radiator" [at these > frequencies, radiator is a euphemism] through Europe and > due to some application there, couldn't even start > although the power could not even be measured within 10 > meters. > > Seriously, there was NOTHING at 10 m. They saw > "intentional radiator" > >150KHz, and said NO. > > > >Did we use the wrong people? > > It's difficult to tell. Was 150 kHz the actual operating > frequency or did it just emit (marginally) at that > frequency? 150 kHz is just above the lower end of the LF > broadcast band (lower end 148.5 kHz) and it could be > argued that no intentional radiator can be accepted whose > operating frequency is in a broadcast band. > -- > Regards, John Woodgate, OOO - Own Opinions Only. > Deadlines are 90% of deadliness. > http://www.jmwa.demon.co.uk Also see > http://www.isce.org.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/listserv/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: > > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the > web at: > > http://www.ieeecommunities.org/emc-pstc 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
