f([THETA]) = E([THETA])/E(O)
where:
E([THETA]) is the radiation from the tower at angle [THETA].
E(O) is the radiation from the tower in the horizontal plane.
where:
G is the electrical height of the tower, not including the base insulator and pier. (In the case of a folded unipole tower, the entire radiating structure's electrical height is used.)
where:
A is the physical height of the tower, in electrical degrees, and
B is the difference, in electrical degrees, between the apparent electrical height (G, based on current distribution) and the actual physical height.
G is the apparent electrical height: the sum of A and B; A + B.
See Figure 1 of this section.
where:
A is the physical height, in electrical degrees, of the lower section of the tower.
B is the difference between the apparent electrical height (based on current distribution) of the lower section of the tower and the physical height of the lower section of the tower.
C is the physical height of the entire tower, in electrical degrees.
D is the difference between the apparent electrical height of the tower (based on current distribution of the upper section) and the physical height of the entire tower. D will be zero if the sectionalized tower is not top-loaded.
G is the sum of A and B; A + B.
H is the sum of C and D; C + D.
[DELTA] is the difference between H and A; H-A.
See Figure 2 of this section.
[THETA] | f([THETA]) |
0 | 1.0000 |
30 | 0.7698 |
60 | 0.3458 |
[THETA] | f([THETA]) |
0 | 1.0000 |
30 | 0.7364 |
60 | 0.2960 |
[THETA] | f([THETA]) |
0 | 1.0000 |
30 | 0.5930 |
60 | 0.1423 |
47 C.F.R. §73.160