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//Chapter 5, Example 5.10, page 205
clc
//Initialisation
d=3000 //distance in Km
re=6370 //radius of earth in Km
phi=72 //angle in degree
N=5*10**11 //electron density
pi=3.14
//Calculation
teta=3000*(2*6370)**-1 //in radian
teta1=teta*180/pi //degree
dt=90-teta1-phi //Elevation angle
a=re/(sin(phi*pi/180))
b=sin((teta1+phi)*pi/180)
h=(a*b)-re //Height in Km
fc=9*sqrt(N) //frequency in MHz
MUF=fc*(cos(phi*pi/180))**-1 //Maximum working frequency
//Results
printf("(1) Elevation angle = %.1f degree",dt)
printf("\n(2) Height h = %.1f km",h)
printf("\n(3) MUF = %.1f MHz",(MUF*10**-6))
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