Describe briefly three factors which justify the need for modulation of audio frequency signals over long distances in communication..
Q. 2. (a) Describe briefly three factors which justify the
need for modulation of audio frequency signals
over long distances in communication. (b) Draw
the waveforms of (i) carrier wave, (ii) a modulating
signal and (iii) amplitude modulated wave.
Q. 3. (a) Give three reasons why modulation of a
message signal is necessary for long distance
transmission. (b) Show graphically an audio
signal, a carrier wave and an amplitude modulated
wave.
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