You have a new summer job with NASA and are working on astronomical observations using electromagnetic radiation that is not in the visible range. Your supervisor has explained 21cm radiation….
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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.
