EMC-PSTC'ers,
I just ran across the following article on measuring low-frequency
radiated emissions to meet FCC regulations:
Straus, Isidor, "Loops and Whips, Oh My! On Low Frequency
Measurements Issues," Conformity, pp. 22-28, August 2002.
After reading your posts (especially the one from Michael Peters on 6
Sep 2002) and more studying of FCC Part 15, I believe the best procedure
for FCC testing of intentional radiators is:
1. Measure radiated and conducted emissions just as we would do for any
unintentional radiator.
2. Measure radiated and conducted emissions from the "lowest radio
frequency generated in the device" on up to the specified highest
frequency, to meet clause 15.33(a).
I had followed this procedure to FCC test two 418MHz telemetry
transmitters for a client. In this particular case I was comfortable,
because Don Bush had tested previous products for this client this way,
and they had all been licensed by the FCC without any problems.
But I wanted more justification for not testing intentional radiations
to FCC Part 15 clause 15.209(a) below the fundamental frequency, than
"just because we've always done it that way".
Thanks all!
John Barnes KS4GL
dBi Corporation
http://www.dbicorporation.com/
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