RADIO PROPAGATION OVER SPHERICAL EARTH 



483 



5 

 10 

 15 

 20 

 25 

 30 

 35 

 40 

 45 

 50 

 55 

 60 



50 100 



DISTANCE IN KILOMETERS 



500 



Fig. 4 — Comparison between theory and experime^it on 4.2 mc. Experimental 

 points from Fig. 1 of "Nortii Atlantic Ship-Shore Radio Telephone Transmission 

 During 1930 and 1931" by C. N. Anderson, Proc. I.R.E. 21, 81-101, January 1933. 



Curve 1 — Theoretical neglecting refraction. 



Curve 2 — Theoretical assuming average refraction from meteorological data. 



Curve 3 — Theoretical assuming same refraction as curve 3 of F"ig. 3. 



Curve 4 — Theoretical for plane earth taking finite conductivity into account. 



50 



50 



y -d/VXK^ (diXiN KILOMETERS) 



1000 



Fig. 5 — Comparison between theory and experiment on 2, 1.4, and 0.43 mc. 

 Experimental points from Bion and David; theoretical curve from equation 

 (7). 



