Change in total power with modulation index

What is the change in the value of transmitted power when the modulation index changes from 0 to 1?


a.) 100%
b.) Remains unchanged
c.) 50%
d.) 80%

Correct Answer: c) 50%

Explanation:

Pt= Pc ( 1 + m2/2)

Pt= Pc ( 1 + 02/2) = Pc……………..(1)

New total power Pt1= Pc ( 1 + 12/2)
= Pc *3/2……………..(2)
(2) / (1),

We get , Pt1/ Pt= 3/2= 1.5
Pt1= 1.5 Pt
i.e. there is increase in total power by 50%
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