On 14/11/16 17:28, Pete Dowdell wrote:
I would guess it's programmed in the router firmware, particularly BT gear as that's what almost all the networks around me are. Apparently the 1 - 6 - 11 rule is not hard-and-fast and you may benefit from using a different channel (as you did).
If I set my router to "auto-select" the channel, it always picks the same one, and usually a busy one. I use Wifi Analyser on my android mobile, It has a graph which shows which channels are in use (their centre and the amount they're overlapping other bands) and how strong they are. This is quite useful in working out which to use on my router. It also recommends best channels to use, and it's usually right.
Cheers Steve