2.4835 GHz. The United States has 11 channels, and each channel is 22-MHz wide. Some
channels overlap with others and cause interference. For this reason, channels 1, 6, and 11
are most commonly used because they do not overlap. In fact, many consumer-grade wire-
less devices are hard set so you can choose only one of the three channels. Figure 1-2
shows the 11 channels, including overlap. Again, notice that channels 1, 6, and 11 do not
overlap.
1 2 3 4 5 6 7 8 9 10 11Channel:Key Topic22 MHzWideFigure 1-2 2.4-GHz Channels
With 802.11b and 802.11g, the energy is spread out over a wide area of the band. With
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