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Chapter 7. PRIVACY OVER THE AIRWAVES > The Wireless Spectrum

The Wireless Spectrum

Certain frequencies best accommodate certain uses. Ranges of frequencies and some ways they are used are shown in Figure 7.2. For instance, broadcast television stations generally use the 54 MHz–216 MHz range for VHF channels. If the television is attached to an antenna, it captures waves that are broadcast at this frequency and receives the programs that are shown on your television screen. When you change the channel, it means that you have tuned the television to pick up a wave of a slightly different frequency. Wireless telephones are no different, except they transmit and receive signals that are broadcast at a different frequency than television signals.

Figure 7.2. Wavelengths measured in Hertz (Hz).



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