(a) State three important factors showing the need for translating a low-frequency signal into a high-frequency wave before transmission.
(b) Draw a sketch of a sinusoidal carrier wave along with a modulating signal and show how these are superimposed to obtain the resultant amplitude modulated wave.

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Solution

Following are the resons-
1)For efficient transmission and reception , the transmitting and recieving antennas must have length equal to quater wavelengths .setting up vertical antennas of such size is practically impossible.
2)The energy radiated by antenna is practically zero .The power radiated at audio frequency is quite small . Hence, transmission occurs in loss
3) The various information signals transmitted at low frequeny get mixed and hence cannot be distinguised

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