296 



ATTENUATION OF RADIO WAVES 



Table 7.7. Drop size distribution 



( Burrows-A ttwood ) 



Drop diameter, 



D, in 



centimeters 



0.05 

 .10 

 .15 

 .20 

 .25 

 .30 

 .35 

 .40 

 .45 

 .50 

 .55 

 .60 

 .65 

 .70 



Precipitation rate, p, in mm/hr 



0.25 



1.25 2.5 



Percentage of a given volume containing 

 drops of diameter, D 



1.0 



4.1 



7.6 



11.7 



13.9 



17.7 



16.1 



11.9 



7.7 



3.6 



2.2 



1.2 



1.0 



0.3 



Table 7.8. Attenuation in decibels per kilometer for different rates of rain precipitation 



Temperature 18 °C 

 (Burrows-Attwood) 



Table 7.9. Attenuation in rains of knoivn drop size distribution and rate of fall 



(decibels per kilometer) 

 (Burrows-Attwood) 



