Note about 802.11a channels

As you probably already know, the list of channels available via MadWifi on 11a is (in the US reg domain):

  • Channel 36 : 5.18 GHz
  • Channel 40 : 5.2 GHz
  • Channel 42 : 5.21 GHz (T)
  • Channel 44 : 5.22 GHz
  • Channel 48 : 5.24 GHz
  • Channel 50 : 5.25 GHz (T)
  • Channel 52 : 5.26 GHz
  • Channel 56 : 5.28 GHz
  • Channel 58 : 5.29 GHz (T)
  • Channel 60 : 5.3 GHz
  • Channel 64 : 5.32 GHz
  • Channel 149 : 5.745 GHz
  • Channel 152 : 5.76 GHz (T)
  • Channel 153 : 5.765 GHz
  • Channel 157 : 5.785 GHz
  • Channel 160 : 5.8 GHz (T)
  • Channel 161 : 5.805 GHz
  • Channel 165 : 5.825 GHz

Note however that channels 42, 50, 58, 152 and 160 are not available for non-turbo mode operation. This is no bug, but related to the way turbo mode works. In the 11a frequency ranges there are five channels (42, 50, 58, 152, 160) available for use with turbo mode, and these "turbo channels" use non-standard center frequencies.

http://www.super-g.com/collateral/atheros_superg_whitepaper.pdf has a small graphics explaining the differences in channel allocation between non-turbo and turbo. See section "Super G Key Features / Dynamic Turbo" (page 12).