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+clc;
+//page 748
+//problem 14.3
+
+//The distance d = 30 * 1.6 * 10^3 m;
+d = 30 * 1.6 * 10^3;
+
+//Frequency f = 4 * 10^9 Hz
+f = 4 * 10^9;
+
+//Wavelength w = c/f m 
+w = 3*10^8 / f;
+
+//Transmitter gain KT = 40 dB
+KT = 10^4;
+
+//Reciever gain KT = 40 dB
+KR = 10^4;
+
+//Reciever power PR = 10^-6 Watt
+PR = 10^-6;
+
+//Transmitter power PT
+PT = PR*(4*%pi*d/w)^2/ (KT*KR);
+
+disp('The transmitter output is '+string(PT)+' Watt')
+
+
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