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What is the need for modulation?
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Answer Posted / amal dev.p
1.Long distance transmission:-
The capability of a wave to travel is directly
proportional to the wavelength,so increase in wavelength
increase the distance that covered by the wave.
2.Noise reduction:-
Noise is a low frequency signal so its tendency to mix with
high frequency signal is low.
3.Height of antenna:-
Height H=(wavelength)/4 but frequency F=c/(wavelength)
where c=3*10^8
so increase in wavelength decrease the height of antenna.
4.Adjacent channel reduction:-
All senders use signals of approximately same(with point
difference)wavelength.So there is chance for interfering of
waves so mixing this modulating wave with a high frequency
carrier wave increase the difference between the wavelength
of adjacent channels.
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