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Amplitude Modulation
1. Determine ? and the percentage of the total power carried by the sidebands of the AM wave for tone modulation when (a) µ = 0.5 and ( b) = 0.3
2. Find for a simple case of tone modulation when modulating signal is
3. The signal is modulated by the carrier using DSB modulation.
a) What are the frequencies of the base band signal and the carrier signal in Hz?
b) Plot the time signals , and .
c) Calculate the mathematical expression of
4. Explains the methods of generating DSB-SC.
5. Explain the working of envelope detector.
6. A 360-W carrier is simultaneously modulated by two audio waves with modulation percentages of 55 and 65, respectively. What is the total side band power radiated.
7. When a broadcast AM transmitter is 50 percent modulated, its antenna current is 12A. What will the current be when the modulation depth is increased to 0.9?
8. The antenna current of an AM broadcast transmitter, modulated to a depth of 40 % by an audio sine wave, is 11 A. It increases to 12 A as a result of simultaneous modulation by another sine wave. What is the modulation index due to this second wave?
9. Calculate the maximum power for the AM wave
10. For a base band signal m (t) = cos wmt, find the DSB –SC signal, Sketch its spectrum.
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