@GreenMan We have two customers that are in an area where using DFS channels is near impossible without receiving the dreaded DFS event detected and all the APs start switching channels and eventually land on the already busy UNII-1 channels. Maybe useless was a bit strong but it currently feels like the MR44 is getting a bad deal here as it leaves the higher performing APs with only two channels at 40MHz or one usable channel at 80MHz without those UNII-3 channels. We have been alternating the MR44 APs with channels 42 and 155 at 80Mhz for great performance in denser office space, with the rest of the office using 40MHz channels on the MR36 APs. I agree with @Paccers that the DFS requirement was removed for the UK market for 5725-5850MHz with a maximum mean e.i.r.p of 200mW as per IR2030/8/3, which is mentioned in the links Paccers has linked to from our regulator Ofcom. The access points currently seem to be working to these rules as no DFS events are observed when using these channels and the AP will use these channels straight away rather than the usual delay when selecting a DFS channel.
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