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Communication Systems

Q1:

A 360 W carrier is simultaneously modulated by two audio wave with modulation percentage of 55 and 65 respectively. Total sideband power radiated will be

A 500 W

B 360 W

C 180 W

D 130 W

ANS:D - 130 W

Mt=Underroot( m1^2 + m2^2).
Mt=underroot (0.55^2 + 0.65^2).
Mt=0.85.

Psb = (Pc Mt^2)/2.
Psb= (360x (0.85)^2)/2.
Psb= 130W.



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