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Write two factors justifying the need of modulating a signal. A carrier wave of peak voltage `12 V` is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75% ? |
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Answer» Modulation of a signal is necessary to transmit a signal in the audio frequency range over a long distance on account of (i) suitable size of the antenna, (ii) suitable effective power radiated by the antenna , (iii) avoiding mixing up of signals from different transmitters. here, `A_c = 12 V, A_m = ?` `mu = 75% = 0.75` As ` mu = A_m/A_c` `:. A_m = muA_c = 0.75 xx 12 = 9V. ` |
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