Goto Section: 80.757 | 80.761 | Table of Contents
FCC 80.759
Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 80.759 Average terrain elevation.
(a)(1) Draw radials from the antenna site for each 45 degrees of azimuth
starting with true north. Any such radial which extends entirely over land
from the antenna site to the point of +17 dBu field strength need not be
drawn.
(2) If the distance from the antenna site to the point of +17 dBu field
strength between any of the 45 degrees radials would be less than the
distances calculated along these radials, an additional radial between such
adjacent radials must be plotted and calculations made in each case. Each
additional radial must be that radial along which it appears by inspection
that transmission loss would be greatest.
(b) Draw a circle of 16 km (10 statute mile) radius using the antenna site
as the center. Divide each radial into 320 meter (0.2 statute mile)
increments inside the circumference to the 3.2 km (2 statute mile) point.
(c) Calculate the height above sea level of each 320 meter (0.2 statute
mile) division by interpolating the contour intervals of the map, and record
the value.
(d) Average the values by adding them and dividing by the number of readings
along each radial.
(e) Calculate the height above average terrain by averaging the values
calculated for each radial.
[ 51 FR 31213 , Sept. 2, 1986, as amended at 58 FR 44953 , Aug. 25, 1993]
Goto Section: 80.757 | 80.761
Goto Year: 2006 |
2008
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