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Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
Long-range Wi-Fi is used for low-cost, unregulated point-to-point computer network connections, as an alternative to other fixed wireless, cellular networks or satellite Internet access. Wi-Fi networks have a range that's limited by the frequency, transmission power, antenna type, the location they're used in, and the environment. [ 1 ]
Most domestic microwave ovens operate by emitting a very high power signal in the 2.4 GHz band. Older devices have poor shielding, [14] and often emit a very "dirty" signal over the entire 2.4 GHz band. [a] This can cause considerable difficulties to Wi-Fi and video [16] transmission, resulting in reduced range or complete blocking of the signal.
This Linksys WRT54GS, a combined router and Wi‑Fi access point, operates using the 802.11g standard in the 2.4 GHz ISM band using signalling rates up to 54 Mbit/s. IEEE 802.11 Wi-fi networks are the most widely used wireless networks in the world, connecting devices like laptops (left) to the internet through a wireless router (right).
This file was derived from: 2.4 GHz Wi-Fi channels (802.11b,g WLAN).png by Michael Gauthier: Author: Michael Gauthier, Wireless Networking in the Developing World; KelleyCook, image improvements; Whidou, French translation; Other versions
That means you can use wifi-channel 1,5,9,13 (keep in mind that in the USA channel 13 has some limitations). Keep it clean for the User, do NOT name the 40MHZ-Channels by mid-frequency, name them by 20MHz fallback-channel. So tell the user to select channel 1 or channel 13 for 40MHz bandwidth on 2.4GHz wifi.