CALCULATION OF RADIO GAIN 4.2] 
10,000 
2000 
1000 
500 
OLY 
100 125 150 
Betty. 
MERRREDEZ2 
WE 
VON VIG 
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Zo 
RUNING 
SUNTAN 
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A 
Tol {| 
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ans 
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175 200 225 250 275 300 325 350 
d IN KILOMETERS 
Figure 49. Maximum range for\ = 3 meters (sea water vertical polarization — 20 log g’ = 1). See equation (186). 
General Solution for Vertical 
(or Horizontal) Dipole 
Over a Smooth Sphere 
1. Field strength of dipole. The vertical component 
of the electrical field of a vertical dipole radiating 
in a homogeneous atmosphere over a sphere of 
radius ka (or horizontal component in the case of a 
horizontal dipole) is given by equation (192). The 
solution is valid provided the distance between 
receiver and transmitter and the radius of .the 
sphere are much greater than a wavelength, condi- 
tions which are fulfilled im any practical application 
of short waves. 
E =2F)(2 rt)? ») eo 
Tn 
—ITS 
fnlhi) + fn (he)|. (192) 
m= 
