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Communication Systems

Q1:

If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be

A 50

B

C 100

D 150

ANS:A - 50

Ans is B.

Pt =Pc (1+m2/2),
m=1.
Pt =1.5 Pc.
Now PSB =m2 Pc /2.
m=1.
PSB = Pc /2=0.5Pc.

%Saving = (1.5-0.5)/1.5.
%Saving = 66.66%.



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