144 



COVERAGE DIAGRAMS 



where A' = {F«/Fi)pD. The divergence factor may 

 be found directh^ from Figure 11 for the coiTected 

 values of n and 7 '. It will be found that for the higher 

 lobes, the effect of {\n) upon the value of the 

 divergence factor is negligible. 



Table 5 sliows calculations of the corrected values 

 of n and 7 when the i-adiation from antenna A of 

 6.(i.3 and Table 4 is vertical!}^ polarized. Trans- 

 mission over sea water is assumed. Tables 6 and 7 

 illustrate the effects of vertical polarization on reduc- 

 ing the maxima and increasing the minima. 



of n and minimum ranges. The free-space range is 

 100 km, as in Section 6.6.3. The last column shows 

 the ratio of ranges for horizontal and A-ertical polar- 

 ization. 



68 GENER.4LIZED COVERAGE DIAGRAMS 

 (HORIZONTAL POLARIZATION) 



*^^ Basic Parameters 



The u-v method applied to generalized coordi- 

 nates which was given in Section 6.5.2 may be 



Tables 6 and 7 show the effect of a reflection 

 coefficient which is less than unity upon the ma.\- 

 imum and mmimum ranges of station A in Section 

 6.6.3. The first table gives odd values of n and 

 maximum ranges; the second table gives even values 



extended to all transmitter heights and wa\'elengths. 

 In this method, points on the lobe are located by the 

 intersection of the path-difference locus with the 

 normalized distance envelope. The basic parameters 

 are rfo and K. 



