Give reason, why high frequency carrier waves are needed for effective transmission of information signals.

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What is the range of frequencies used for T.V. transmission? State two factors by which the range of TV signals can be increased.

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Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.                                                          2 marks

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(a) Define the term 'modulation index,' used in communication system. Why is

     its value kept less than or equal to one ?

(b) A message signal of frequency 10 kHz and peak voltage of 10V is used to

      modelate a carrier frequency 1 MHz and peak voltage 10 V. Determine the

      (i) modulation index, and 

      (ii) side bands produced.

                                                                                                      3 marks

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A message signal of frequency 20 KHz and peak voltage of 20 volts is used to modulate a carrier signal of frequency 2 MHz and peak voltage of 40 volts. Determine (i) modulation index, (ii) the side bands produced. Draw the corredponding frequency spectrum of amplitude modulated signal.

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Draw a block diagram of a generalized communication system. Write the functions of each of the following :

(a) Transmitter 

(b) Channel

(c) Receiver                                     (3)

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(a) How is amplitutde modulation achieved?

(b) The frequencies of two side bands in an AM wave are 640 kHz and

660kHz respectively. Find the frequencies of carrier and modulating 

signal. What is the bandwidth required for amplitude modulation?            (3 marks)

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Explain the terms (i) Attenuation and (ii) Demodulation used in communications system.                          (1)

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(a) Explain any two factors which justify the need of modulating a low frequency

signal.                                                                                                         (3 marks)

(b) Write two advantages of frequency modulation over amplitude modulation.

 

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A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. What are the frequencies of the side bands produced?

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