To add another observation: Robert has described the radiator as an E-field device, yet no CISPR/ETSI/EN/FCC emissions standards use anything but an electrically shielded magnetic loop antenna in this frequency range (ok, MIL and RTCA use an E-field rod antenna, but not applicable here)!
Not surprising that nothing shows up. With respect, Brent DeWitt Everett, WA > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf > Of [email protected] > Sent: Tuesday, July 12, 2005 11:00 AM > To: [email protected]; [email protected] > Cc: [email protected] > Subject: RE: Radiated emission measurement below 30MHz > > > 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] > > > -----Original Message----- > 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. 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