Questions and Answers
What is the purpose of modulation in radio transmission?
To carry the audio signal at high frequencies for long distance transmission
What is the process known as removing the audio signal from the modulated wave at the radio receiver?
Demodulation
Why is it not feasible to directly send audio signal over the air for long distances?
Because it requires large power
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.
