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diff --git a/2409/CH12/EX12.11/Ex12_11.sce b/2409/CH12/EX12.11/Ex12_11.sce
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+
+//Variable Declaration
+
+Ps=-91.4      //saturation flux density(dBW/m2)
+f=14          //uplink frequency(GHz)
+GTR=-6.7      //G/T (dB/k)
+BO=11        //Input Back off(dB)
+k=-228.6       //Value of k(dB)
+RFL=0.6      //receiver feeder loss
+
+//Calculation
+
+A0=-21.5-20*log10(f)   //Effective antenna aperture(dB)
+CNR=Ps+A0-BO+GTR-k-RFL    //carrier to noise ratio(dB)
+
+//Result
+disp(A0)
+printf("The carrier to noise ratio is %.1f dB",CNR)