As seen in Fig. 1, 80 MHz channel bandwidth
allows 5 non-overlapping channels in the United
States (channels 120 –128 are prohibited due to
terminal Doppler weather radar [TDWR]) and 5
in the United Kingdom/European Union (channels
149 and higher require light licensing for
outdoor use only) when DFS is used, but only 2
channels in the United States and 1 in the United
Kingdom/European Union without DFS.
DFS is mandatory for 160 MHz channel bandwidth
with 1 non-overlapping contiguous 160
MHz channel in the United States and 2 in the
United Kingdom/European Union.