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I don't know whether increasing the channel [band] width merely disperses the same transmission power over a wider frequency range, and whether that would increase efficiency (it might if they were using CDMA, I think)

E.g., I can, on my TP-Link choose channel width of 20 or 40 Mhz

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2 Answers 2

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802.11n can combine two 20 MHz channels to form an effective bandwidth of 40 MHz. 40 MHz enables higher data transmission rates to be achieved as compared to 20 MHz. When you select 20/40 MHz mode, the router decide to use 20 or 40 MHz based on the interference/contention the router detected.

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Basically set it to 20/40 auto, if you don't have an auto mode, try 40 if your not in a congested area, but if the WiFi spectrum in your area is congested it could reduce performance.

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  • Downside is that you risk greater interference. But I used a Wifi signal detector and found a clear section (and our phones are not 2.4 Ghz, so should be nothing much besides Wifi affecting us) Commented Jul 6, 2016 at 23:50
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The answers to this question asked gives a good overview of the 20/40 mhz question.

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