In message
<7b3d1875a9a53142ab5d421ee97d0e6003bbb...@ccsexchange.ccsdomain.ccsemc.co
m>, dated Wed, 25 Jan 2012, Michael Heckrotte
<michael.heckro...@ccsemc.com> writes:
Years ago I recall discussions about electronic wristwatches and FCC
compliance; the power drawn from the watch battery was less than the
output power of an emission that would just pass the Class B limit
therefore compliance was inherent and no EMC testing was required. I
don?t know if this was ever codified.
It wasn't codified into the EMC Directive or the Guide, but it is a very
good approach and would probably convince in Europe. I suspect it's not
inconsistent with my suggestion that actual emission 40 dB below the
relevant limit is a criterion for 'benign' that some would demand.
Extending this concept to a radio would give new meaning to a
flea-powered transmitter.
Indeed, but EMC basically doesn't care whether the radiator is
intentional or not (except on-channel, of course); what is sauce for the
wristwatch is sauce for the radio.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Some people who are peeling the finch of the financial crisis are thinking of
biting a rook.
-
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