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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))