Write two factors which justify the need of modulating a low frequency signal into high frequencies before transmission

Open in App

Solution

The required two factors are -
a) The transmission of the low-frequency signal needs an antenna of height 4-5 km which is impossible to construct. So we need to modulate wave in order to reduce the height of the antenna .
b) The effective power radiated by the antenna will be as $P \propto \frac{1}{λ^{2}}$ . Thus, for effective radiation by an antenna, we need to modulate the wave.

Suggest Corrections

Similar questions

Q. (a) Explain any two factors which justify the need of modulating a low frequency signal.
(b) Write two advantages of frequency modulation over amplitude modulation.

Q. State three important factors showing the need for translating a low frequency signal into a high frequency wave before transmission.

State three important factors showing the need for translating a low frequency signal into a high frequency wave before transmission.

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.

Q. Write any two factors which justify the need for modulating a signal.
Draw a diagram showing an amplitude modulated wave by superposing a modulating signal over a sinusoidal carrier wave.

Q. Write three important factors which justify the need of modulating a message signal. Show diagrammatically how an amplitude modulated wave is obtained when a modulating signal is superimposed on carrier wave.

Join BYJU'S Learning Program