THK C VI.Cl I.VTION ()!•' VERTICAL COVERAGE 



L69 



1000 



Figure 71. Divergence factor graph. 



where ^ = the angle of reflection measured from the 

 horizontal; 



e c = e r — j6CVA; 



t r = dielectric constant of the reflector rela- 



■ tive to air; 

 a = conductivity of the reflector, mhos per 



meter; 

 X = wavelength, in meters; 

 <$> = phase angle, lagging. 



Some typical ground constants are given in 

 Table 12. 



Table 12. Terrain reflection characteristics. 



