76 



CALCULATION OF RADIO GAIN 



er 



I 



1.0 



.6 .5 .4 



„- _du .A 



P v/2Kah| " dj 



.2 



Figure 17. Divergence factor D as a function of p and g or y and s. (Radiation Laboratory.) (p = 1 is the line of sight 

 where Z) = 0.) Note: S = 1 - q = di/d. 



Hence, on using equations (93), (94), and (95), 



(97) 



are unknowns. From equation (60) 

 di do 



Figure 18 shows (1 — p-)-/p as a function of p. 



The receiver height ho may also be expressed in 

 terms of hi, p, and q. This will be found useful in 

 drawing coverage diagrams in which both ho and d 



or 



_dl^d,r_dl\ 

 2ka di \ 2ka/ 



