What specific frequency you are looking at? You could use 40dB/dec for freq
below 30MHz per FCC Pt.15.31. But you'd better use the real roll off factor
>from the data measured at 3, 10, and 30m.
At 7/15/2010 09:18 AM, rehel...@mmm.com wrote:
How do you determine roll-off (extrapolation factor) for frequencies
under 30
MHz, in particular, for a test site? The "standard" roll-off is 20 dB/decade.
Thanks,
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
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