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Chapter 2. Understanding Wi-Fi > The Free Spectrums

The Free Spectrums

As you probably know, any signal that is sent without wires is called a radio transmission. A common example is that the radio in your car receives transmissions. Similarly, a standard cell phone works by receiving—and transmitting—radio signals.

Every device that broadcasts a radio transmission does so at a particular frequency, which is the oscillations, or movement from peak to trough, of the electromagnetic wave created by the transmission.


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