REFLECTION THEORY — PROPAGATION BEYOND THE HORIZON 



641 



Crawford Hill, N. J., and Round Hill, Mass., for which experimental 

 data is published.' For this circuit a = 0.05° (3 db points) and di = 1° 

 (4/3 earth radius). The tal)le below gives the calculated variation of re- 

 ceived power as angle d-i is varied. 



6; = 1° 1.1° 1.2° 1.4° 1.0° 1.8° 2° 2.2° 

 10 logio {Prx/Pri) = 2.3 4.5 8.5 12 15 17.9 20.5 



The received power versus elevation angle, 7 = 02 — ^i , is plotted in 

 Fig. 10. The calculated and experimental curves are in good agreement. 



If the beams of the antennas are steered simultaneously in the hori- 

 zontal plane. Fig. 11, the calculation of the variation of received power is 



if) 



_i 



LU 



u 



UJ 

 Q 



LU 



o 



Q. 



Q 

 LU 

 > 



LU 

 U 



w 

 a. 



LU 



> 



-8 

 -10 

 -12 



-14 



> -16 



-18 



-20 



-22 



-0.2 -0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 



VERTICAL ANGLE, /, IN DEGREES 



Fig. 10 — Relation between received power and vertical angle y. 



