Write two factors justifying the need of modulation for transmission o

1.	Write two factors justifying the need of modulation for transmission of a signal.
Answer» Two factors justifying the need of modulation for transmission of a signal are : (a) Managable size of the antenna: Audio signals when converted into emwaves have low frequency and large wavelength λ, so an antenna of large length L = λ/4 ≈ 3.75 km is required, which is unpractical. However for modulating audio signals with carrier waves of large frequencies, antenna of small managable size is required. (b) More effective power radiated by antenna: Power radiated by antenna is p ∝ l²/λ² This shows that there is a need of higher frequency conversion for effective power transmission by the antenna.

Write two factors justifying the need of modulation for transmission of a signal.

Answer»

Two factors justifying the need of modulation for transmission of a signal are :

(a) Managable size of the antenna: Audio signals when converted into emwaves have low frequency and large wavelength λ, so an antenna of large length L = λ/4 ≈ 3.75 km is required, which is unpractical.

However for modulating audio signals with carrier waves of large frequencies, antenna of small managable size is required.

(b) More effective power radiated by antenna: Power radiated by antenna is p ∝ l²/λ²

This shows that there is a need of higher frequency conversion for effective power transmission by the antenna.

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