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diff --git a/1574/CH3/EX3.4/M_Ex_3_4.sce b/1574/CH3/EX3.4/M_Ex_3_4.sce
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+clc
+//Chapter3: Modulation
+//Example3.4, page no 138
+//Given
+Ebb=2e3//DC plate supply
+Ecc=-500//DC grid bias
+Ib=67e-3//DC plate current
+Ic=30e-3//DC grid current
+Egm=750//RF peak grid voltage
+Pout=75//RF Power output
+Ma=0.75//Depth of modulation
+Paf=(Ma^2*Ebb*Ib)/(2*1)//modulating power required from the audio source
+Pdc=Ebb*Ib//Power supplied by DC source
+Zm=Ebb^2/Pdc//Modulator Impedance
+
+Pd=Pdc+Paf-Pout//Plate dissipation
+mprintf('modulating power required from the audio source\n is:%f watts\n Modulator Impedance is:%f ohm\n Plate dissipation is:%f watts',Paf,Zm,Pd)
diff --git a/1574/CH3/EX3.4/Result_of_Chapter_3_Ex3_4.JPG b/1574/CH3/EX3.4/Result_of_Chapter_3_Ex3_4.JPG
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