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+//chapter-8 page 338 example 8.3
+//==============================================================================
+clc;
+clear;
+
+//For a reflex klystron 
+n=2;//peak mode value
+V0=300;//beam voltage in V
+I0=0.02;//beam current in A
+Vs=40;//signal voltage in V
+J1=1.25;//bessel coefficient for n=2
+
+//CALCULATION
+Pdc=V0*I0;//The input power in watts
+Pac=((2*Pdc*J1)/((2*n*(%pi))-((%pi)/2)));//The output power in watts
+n=(Pac/Pdc)*100;//Efficiency in percentage
+
+//OUTPUT
+mprintf('\nThe input power is Pdc=%1.0f watts \nThe output power is Pac=%1.2f watts \nEfficiency is n=%2.1f percentage',Pdc,Pac,n);
+
+//=========================END OF PROGRAM===============================
+