AC87u - how to force to non DFS channel

[SmashIt]

I'm using the AC87U (FW: 380.3459) already for sometime now. But lately I noticed that some of my 5GHz clients cannot find the AC87U anymore. The reason is that the AC87U is switching to a DFS channel (although I selected channel 36 as the channel to use) though my clients do not support DFS channels.

How can I force the router to stick to a non-DFS channel?

Thanks in advance.

 

[RMerlin]

Configure a fixed channel instead of leaving it on Auto. The router should never change channel then, provided you didn't start with a DFS channel.

 

[SmashIt]

Merlin thanks for the reply.

I selected fixed channel 36, saved the settings and rebooted the router.
Unfortunately, the router switched again to a DFS channel (as displayed in the wireless log) though the UI is showing channel 36 as selected.

 

[TonyH]

Merlin thanks for the reply.

I selected fixed channel 36, saved the settings and rebooted the router.
Unfortunately, the router switched again to a DFS channel (as displayed in the wireless log) though the UI is showing channel 36 as selected.

How about ch. 149?

 

[SmashIt]

How about ch. 149?

I'm in the Netherlands we only have channels 36-64 and 100-112.