# Modulation

Thread Starter

#### mikeonthegreen

Joined Jan 7, 2007
21
Here is the question. What is the formula?

An AM transmitter transmits 200 W when modulated at 40%. The power in the lower sideband is ________ W.
Your answer: 85.18
The correct answer: 7.41

#### beenthere

Joined Apr 20, 2004
15,819
Hi,

How did the correct answer get arrived at? Think of this - if the total power in both AM sidebands is X watts, then the power in either the upper or lower sideband is __ % of the total.

#### ak86

Joined Jan 26, 2007
5
Pt=Pc(1+m^2/2) is the correct formula for this so u'll need to substitute in this and you get the answer,understood if this is wrong formula then let me know the correct one.
thank you

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