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FM10A 23
broadcast on a school campus, campground or local neighborhood, as long
as you do not cause interference to broadcast reception.
“Why talk about acres"?
There are three reasons to translate our look at "field strength" into "acres".
(1) The first one is easy: the numbers would get too cumbersome if we
discussed your possible signal coverage in terms of square feet or
square meters.
(2) It's very easy to see that your signal can easily and legally serve a
school campus or wilderness campground.
(3) And, if we remember that typical urban single-family home sites run
from 1/4 to 1/2 acre on the average, it should become extremely clear
that your obligation to avoid interfering with broadcast reception can
easily involve hundreds of homes, before adding apartments!
METERS FEET FIELD
STRENGTH
(µV)
TOTAL
RECEPTION
AREA
3
10 250 314 FT
6
20 125 1256 FT
12
39 63 4800 FT
24
78 31 19113 FT
48
157 15 1.8 ACRES
96
315 7.5 7.2 ACRES
192
630 3.8 28.6 ACRES
384
1260 1.9 11.4 ACRES
768
2520 .95 458 ACRES
1536
5036 .5 1830 ACRES
DISTANCE FROM TRANSMITTER ANTENNA