Radio-spectrum meaning

The entire range of electromagnetic communications frequencies, including those used for radio, radar, and television; the radio-frequency spectrum.
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The complete range of frequencies of electromagnetic radiation useful in radio communication, commonly ranging between 10 kilohertz and 300,000 megahertz.
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The part of the electromagnetic spectrum used to transmit voice, video and data. It uses frequencies from 3 kHz to 300 GHz. See spectrum.
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