(a) Give three reasons why modulation of a message signal necessary for long distance transmission.
(b) Show graphically an audio signal, a carrier wave and an amplitude modulated wave.

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Solution

(a) Modulation is necessary because of following reasons :

(i) Reduction in the height of antenna
(ii) Avoids mixing of signals
(iii) Increases the range of communication
(iv) Multiplexing is possible
(v) Improves the quality of reception

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(a) Give three reasons why modulation of a message signal necessary for long distance transmission.(b) Show graphically an audio signal, a carrier wave and an amplitude modulated wave.

(a) Modulation is necessary because of following reasons : (i) Reduction in the height of antenna (ii) Avoids mixing of signals (iii) Increases the range of communication (iv) Multiplexing is possible (v) Improves the quality of reception

(a) Give three reasons why modulation of a message signal necessary for long distance transmission.
(b) Show graphically an audio signal, a carrier wave and an amplitude modulated wave.

(a) Modulation is necessary because of following reasons :

(i) Reduction in the height of antenna
(ii) Avoids mixing of signals
(iii) Increases the range of communication
(iv) Multiplexing is possible
(v) Improves the quality of reception