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+clc;
+//page no 545
+//prob no. 15.3.1
+// VHF mobile radio system is given
+Pt=100;//transmitted power
+f=150;//freq used in MHz
+d1=20;//height of transmitting antenna in m
+Gt=1.64;//transmitting antenna gain
+ht=2;//height of receiving antenna in m
+d2=40;// distance in km
+wl=c/(f*10^6);
+E0=sqrt(30*Pt*Gt)
+// Field strength at a receiving antenna is
+ER=(E0*4*%pi*d1*ht)/(wl*(d2*10^3)^2);
+disp('uV/m',ER*10^6,'Field strength at a receiving antenna is'); \ No newline at end of file