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//Chapter 3, Example 3.10, page 92
clc
//Initialisation
f=5*10**9 //frequency in Hz
c=3*10**8 //speed of light
h1=6 //in metre
h2=2 //in metre
pi=3.14
//Calculation
h=c*f**-1 //wavelength
w=atan(h1*2250**-1) //grazing angle in radian
w1=w*180*pi**-1 //grazing angle in degree
a=((2*pi*h1*h2)*(h*300)**-1)*3.14*180**-1
e=sin(a)
F=e*2*180*pi**-1 //PGF value (wrong value calculated in textbook)
LR=20*log10(F) //Decrease in received signal level
//Results
printf("(1) Grazing angle = %.2f degree",w1)
printf("\n(2) PGF value = %f",F) //The answer provided in the textbook is wrong
printf("\n(3) Decrease in received signal level = %.2f dB",LR) //The answer provided in the textbook is wrong
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