Explain the need for modulation for long distance transmission.
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When audio signals are transmitted over thousands of
kilometers through radio transmission, the audio
frequencies that lie within the frequency range of 15 Hertz to 20 Kilohertz have very small signal power and
thus cannot be transmitted via antenna for communication purposes. The radiation of electrical energy is
only possible at frequencies above 20 Kilohertz. The main advantage of high frequency signals is that they
can be transmitted over very long distances by dissipating very small power. Thus, the audio signals must
be sent along with the high frequency signals for communication. This can be done by superimposing
electrical audio signals on a high frequency wave called the carrier wave.
kilometers through radio transmission, the audio
frequencies that lie within the frequency range of 15 Hertz to 20 Kilohertz have very small signal power and
thus cannot be transmitted via antenna for communication purposes. The radiation of electrical energy is
only possible at frequencies above 20 Kilohertz. The main advantage of high frequency signals is that they
can be transmitted over very long distances by dissipating very small power. Thus, the audio signals must
be sent along with the high frequency signals for communication. This can be done by superimposing
electrical audio signals on a high frequency wave called the carrier wave.
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