Hi,
Read my thread here, http://community.arubanetworks.com/t5/Access-Points/Change-channel-on-AP105-RAP-used-for-survey/m-p/15104
Set the channel to one of the non-dfs channels. Unfortunately you need to do this every time it powers on, which may not be practical, so try to have a battery pack you can carry around with the AP. Bear in mind, I found that this only lasts for about two hours and then you have to do it again.
Alternatively when you provision the RAP, put it into a group where the channel is fixed and ARM/scanning is disabled.
Hope that helps.
:smileyhappy: