http://www.ieee-pses.org/symposium
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Dear EMC experts,
FCC Part 18 (46 CFR 18.305) defines field strength limit at very
long distance such as 300m and 1600m.
Fortunately, it is permitted to make a measurement at closer
distance:
Sec. 18.305 Field strength limits.
...
2. Testing for compliance with these limits may be made at closer
distances, provided a sufficient number of measurements are taken
to plot the radiation pattern, to determine the major lobes of
radiation, and to determine the expected field strength level at
30, 300, or 1600 meters.
Alternatively, if measurements are made at only one closer fixed
distance, then the permissible field strength limits shall be
adjusted using 1/d as an attenuation factor.
Well, the latter method, adjustment with 1/d, is quite clear.
But the former method is not clear enough for me - how should we
determine the expected level?
Can we simply extrapolate the data at, for example, 3m, 6m and 10m
to determine the expected level at 300m or 1600m?
I think such extrapolation can cause quite large error in the result.
Does anybody here has experience to use the former method for compliance
test, or does anybody knows of more detailed requirements or guidelines?
Regards,
Tom
Tomonori Sato <[email protected]>
URL: http://homepage3.nifty.com/tsato/
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