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+//Chapter 13 example 13
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+MTBF2    = 20000;       // microwave Tx output MTBF figure  
+MTBF3    = 60000;       // power amplifier portion of MTBF
+
+// Calculations
+MTBF1    = (MTBF2*MTBF3)/(MTBF3-MTBF2); 
+impr     = MTBF1-MTBF2      // improvement in MTBF if power amplifier not used
+
+// output
+mprintf('Improvement in MTBF of transmitter if power amplifier is not used = %d hours',impr);
+//------------------------------------------------------------------------------