The following outline is provided as an overview of and topical guide to radio: Radio – transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
The following outline is provided as an overview of and topical guide to radio: Radio – transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
Source: Wikipedia "Outline of radio" · CC BY-SA 4.0
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