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//Chapter 6, Example 6.17, page 271
clc
//Initialisation
pt=30 //transmitter power in watt
d=15 //distance in km
gt=3 //transmitter gain
ht=30 //transmitter height in m
hr=4 //receiver height in m
no=3.77*10**14
//Calculation
gt1=10**(gt*10**-1)
pt1=gt1*pt
e=88*sqrt(pt1)*pt*hr/(2*d**2) //Field strength
pr1=(e**2)/(2*no) //Recieved power
//Results
printf("Field strength = %f V/m",e)
printf("\nRecieved power = %.2f pW",(pr1*10**12))
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