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//Chapter 13 example 2
//------------------------------------------------------------------------------
clc;
clear;
// Given data
f = 4.5; // microwave terrestrial comm link oper. freq in Ghz
D = 40; // single hop path length in miles
hant = 200; // antenna ht. above surface of earth
// from fig
D1 = 5;
D2 = 35;
K = 1; // for normal case
// calculations
F1 = 72.2*((D1*D2)/(D*f))^0.5; // first fresnel zone
// computing curvature 'h' of earth at a distance of 10 miles from Transmitter if given by (D1*D2)/(1.5*K)
h = (D1*D2)/(1.5*K); // curvature of earth in feet
PLabove = hant - h; // path line is PLabove feet above surface of earth
hmaxtol = PLabove - F1; // max tolerable height in feet
// Output
mprintf('Maximum tolerable height of obstacle above surface of earth = %3.1f feet',hmaxtol);
//------------------------------------------------------------------------------
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