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Level 7

Channel width for 5Ghz

I have a TCL 4K UHD (model# 49s405).  It is working just fine but I can't seem to get it to connect to my router on a 40MHz channel on 5GHz for anything.  For example, my router is set to channel 151 which is a 40Mhz wide channel, but the router shows it connected to only one of the 20MHz channels at 144Mbps.  The TV works just fine but I would like to know why.  I also tried an 80MHz wide channel and it does the same thing.
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