Question

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QUESTION :-
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Describe briefly three factors which justify the need for modulation of audio frequency signals over long distances in communication.


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Answer 1

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1. Size of antenna or aerial: For communication the transmitting frequencies should be high.

2. ... The interference of signals from different transmitters: To avoid the interference of the signals there is a need of high frequency which can be achieved by the modulation

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Answer 2

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• Wider Band width: High frequency provide wider bandwidth.
• Distance: High frequency wave used to carry baseband signals (low frequency signal) over a distance of several thousand kilometres.
• Cost : High frequency transmits with low cost.

Three factors for the need of modulating a message signal:

• Size of the antenna or aerial.
• Effective power radiated by an antenna.
• Interference of signals from different transmitters.