Goto Section: 80.757 | 80.761 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 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
(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: 2019 |
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