How is information sent to a radio?

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The short answer to the question is that information is transmitted to a radio by modulating a carrier signal (by packaging the original information inside a sinusoidal signal). After this packed signal is received by the radio it is unpacked and the original info restored.

Suppose you have random signal to transmit `U=U(t)` that varies over time and a sinusoidal carrier `A_max*sin(omega_0*t)` . There are two ways of modulating this carrier with the original signal.

First way is to modulate the value of the...

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