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22 AirPcap User’s Guide
Appendix A: 802.11 Frequencies
2.4GHz Band
2312MHz to 2372 MHz in 5MHz steps.
The 802.11b/g center frequencies and corresponding channel numbers are:
(2412MHz, Channel 1) to (2472MHz, Channel 13), where the frequencies
are incremented by 5MHz and the channel numbers by 1. There is an
additional frequency for channel 14, namely, 2484MHz which is 12MHz
beyond channel 13.
All of the 2.4GHz channels are supported by all of the adapters in the
AirPcap Product Family.
5GHz Band
The 5 GHz range which is divided into a large number of channels. The
center frequency of channel 0 is 5,000 MHz, the center frequency of
channel 1 is 5,005 MHz. The formula for relating channels (n) to center
frequencies in the 5 GHz range is:
Center frequency (MHz) = 5000 + 5*n, where n = 0, …, 199,
Center frequency (MHz) = 5000 – 5*(256 – n), where n = 240, …, 255.
Note that channels 240 to 255 range from 4920MHz to 4995MHz.
Channels Supported by the AirPcap Product Family
All of the 2.4GHz channels are supported by all of the adapters in the
AirPcap Product Family.
AirPcap Ex
AirPcap Ex supports an extended range of center frequencies. The
bandwidth associated with each center frequency is 20MHz. The center
frequencies are:
• 2312MHz to 2372MHz in 5 MHz increments
• 2412MHz to 2472MHz in 5 MHz increments. These correspond to
BG channels 1 to 13
• 2484MHz corresponds to BG channel 14