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Questions and Answers
What is the purpose of modulation in radio transmission?
What is the purpose of modulation in radio transmission?
- To increase the power of the audio signal
- To carry the audio signal at high frequencies for long distance transmission (correct)
- To remove the audio signal from the modulated wave
- To convert the audio signal into electrical signal
What is the process known as removing the audio signal from the modulated wave at the radio receiver?
What is the process known as removing the audio signal from the modulated wave at the radio receiver?
- Conversion
- Demodulation (correct)
- Modulation
- Transmission
Why is it not feasible to directly send audio signal over the air for long distances?
Why is it not feasible to directly send audio signal over the air for long distances?
- Because the power of audio signal is quite small
- Because air cannot carry audio signals
- Because the energy of a wave is directly proportional to its frequency
- Because it requires large power (correct)
Why is wire not used in radio transmission?
Why is wire not used in radio transmission?
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Study Notes
Modulation in Radio Transmission
- Modulation allows information to be transmitted over long distances without degradation or loss of signal strength.
Demodulation
- Demodulation is the process of removing the audio signal from the modulated wave at the radio receiver.
- It is necessary to retrieve the original audio signal from the modulated wave.
Limitations of Direct Audio Transmission
- It is not feasible to directly send an audio signal over the air for long distances because the signal will be weakened and distorted due to the characteristics of air as a medium.
Radio Transmission vs. Wired Transmission
- Wire is not used in radio transmission because it would limit the range and flexibility of communication.
- Radio transmission allows for wireless communication over long distances, making it a more practical and convenient option.
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