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Radio Signals And Energy

Energy is required to create a radio signal. Radio signals use the energy from the transmitter that accelerates electric charge in the transmitting antenna. A radio signal carries this energy from the transmitting antenna Radio towers on Elden Mountain above Flagstaff, Arizona. Each transmitting antenna has a size that matches the wavelength of the signal it transmits. Photograph by Tom Bean. Stock Market. Reproduced by permission.

to the receiving antenna. Only a small fraction of the transmitter's power is normally intercepted by any one receiving antenna, but even a vanishingly-small received signal can be amplified electronically millions of times as required.

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Science EncyclopediaScience & Philosophy: Quantum electronics to ReasoningRadio - The History Of Radio, Radio And The Electromagnetic Spectrum, How Radio Signals Are Created, Modulation - Demodulation