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Equation of modulated signal:

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(1)

1.Write down the basic equation of FM Modulated signal.

2.Draw the block diagram of FM Modulator.

(2)

3.Draw FM Modulated signal for Sine wave and for Square wave modulating signal that means message signal.

5. Find the FM modulation index if modulating signal is 100Cos(2*pi*1000*t) and deviation constant is 20 Hz/volt.

(3)

4. Write down the FM modulated signal equation with respect to modulation index when carrier signal is a sine wave and message signal is cosine.

(4)

6.

(5)

7.Find the transmission bandwidth for fm modulated signal if the modulation Index is 3 and message signal bandwidth is 5 khz.

8.Which technique is used more bandwidth FM or AM?

Ans: FM

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9.Write the difference between AM and FM Modulation?

AM FM

Amplitude of carrier signal is changed with respect to the message signal.

Frequency of carrier signal is changed with respect to the message signal.

Equation of modulated signal:

Y

AM

(t)=[A

c

+ x(t)]cos(2πf

c

t)

Equation of modulated signal:

Y

Fm

(t)=A

c

cos[2πf

c

t+2πk

f

∫x(t)dt]

Modulated wave shape Modulated wave shape

AM modulation needed less

Bandwidth for transmission than FM modulation

FM modulation needed more Bandwidth for transmission than AM modulation

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