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+// Chapter 9 example 8
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given Data
+PW      = 10*10^-6;         // pulse width in sec
+f       = 10*10^9;          // frequency in Hz
+fm      = 1000;             // modulating frequency
+
+// calculations
+BW_M    = 1/PW              // matched bandwidth
+cf1     = f+fm;             // closest freq.
+cf2     = f-fm;             // closest freq.
+fo      = f;                // centre freq.
+
+// Output
+mprintf('Centre of frequency spectrum = %d Khz\n The two closet frequencies to the center of the spectrum are %d Khz and %d Khz',fo/10^3,cf1/10^3,cf2/10^3);
+//------------------------------------------------------------------------------