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+// Example 8.46
+// Calculation of maximum repeater spacing of a)ASK hetrodyne b)PSK homodyne  
+// Page no 500
+
+clc;
+clear;
+close;
+
+//Given data
+
+S=0.2;                             // Split loss
+c=3*10^8;                          // velocity of light
+lambda=1.55*10^-6;                 // Wavelength
+B1=50*10^6;                        // Speed of communication
+h=6.63*10^-34                      // Planck constant
+B2=1*10^9;                         // Speed of communication
+
+
+// a)Maximum repeater spacing for ASK hetrodyne
+P1=(36*h*c*B1)/lambda; 
+P1=10*log10(P1/10^-3);
+s1=4-P1;
+R1=s1/S;
+P2= (36*h*c*B2)/lambda;
+P2=10*log10(P2/10^-3);
+s2=4-P2;
+R2=s2/S;
+//b)Maximum repeater spacing for PSK homodyne
+K1= (9*h*c*B1)/lambda;
+K1=10*log10(K1/10^-3);
+K1=4-K1;
+R3=K1/S;
+K2= (9*h*c*B2)/lambda;
+K2=10*log10(K2/10^-3);
+K2=4-K2;
+R4=K2/S;
+
+//Displaying results in the command window            
+printf("\n Maximum repeater spacing(in Km) = %0.3f  ",R1);
+printf("\n Maximum repeater spacing(in Km) = %0.3f  ",R2);
+printf("\n Maximum repeater spacing(in Km) = %0.3f  ",R3);
+printf("\n Maximum repeater spacing(in Km) = %0.3f  ",R4);
+// The answers vary due to round off error