iMac / channels Airport Extreme DFS

Is it normal that my iMAC does not see my 5 GHz network when it is on a SFR channel (channel 132 to 5.0 ghz)?

I do not use 2 separate SSID, and I have 2.4 and 5.0 on AUTO channels.  However, the iMac, is 15 feet from the router, only sees and connects to the band of 2.4 ghz... when I load inssider, it does not show the 5.0 GHZ, because the auto channel is 132. I change manual, and he put 149, see IT.

Thus, 2015 iMac cannot decrypt channels DFS correctly?

Anyone?

Tags: Mac

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