A modulator is a device used to combine a signal, such as video or audio, with a radio or TV wave to make it suitable for transmission over long distances, like through radio, television, or cable networks. It works by changing the wave’s properties, such as its frequency, to carry the original signal. Modulators are commonly used in broadcasting to send signals to televisions or radios. They are also used in communication systems, like satellite or cable television, to send content over the air or through cables.

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