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+clc
+//Chapter10
+//Example10.2
+//Given
+P=3//Transmitter power
+ht=100// Antenna height
+G=5//Antenna gain
+d=20e3//distance
+lambda=1,hr=1//assumed
+E=((88*G*ht*hr*P^0.5)/(lambda*d^2))//field strength
+mprintf('The field strength at distance 20km is %f uV/m',E*1e6)
+
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