From memory, the latest WLC software (and possibly older versions) allow channel 165 to be disabled. I can not find this functionality on the 1250 or 1140 (autonomous). That is, I want to exclude DFS from picking ch 165, obviously because I would like a 40 Mhz channel and not 20 MHz as is the case when ch 165 is picked due to being at the end of the band? This is when the APs are configured to extend above the primary channel.