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I understand that in digital broadcasting ( radio, TV, ect.) tha carrier wave must be as before a sine wave since this is the way electromagnetic radiation travels.

I understand that in digital broadcasting ( radio, TV, ect.) tha carrier wave must be as before a sine wave since this is the way electromagneticradiation travels. What I don't find described anywhere is : what is the modulation that allows bits to be transmitted? Is it a matter of jumpingup and down between two amplitudes? Thanks for the attention, Paolo de Magistris, Rome.

The problem with using a pure sine wave to transmit data is that a sine wave continues forever, and has a bandwidth of 0 Hz. Unfortunately, with this waveform, you can transmit zero data, and it takes forever to reach the destination.