Most WLANs today operate in the 2.4 GHz band, which can have as many as 14 channels, each occupying 22 MHz of bandwidth. Energy is not spread evenly over the entire 22 MHz, rather the channel is strongest at its centre frequency, and the energy diminishes toward the edges of the channel.
Interference can occur when there is overlap of channels. It is worse if the channels overlap close to the centre frequencies, but even if there is minor overlap, signals interfere with each other. Set the channels at intervals of five channels, such as channel 1, channel 6, and channel 11.
Solving RF Interference
Incorrect channel settings are part of the larger group of problems with RF interference. WLAN administrators can control interference caused by channel settings with good planning, including proper channel spacing.
Interferences caused by household or office appliances.
Other sources of RF interference can be found all around the workplace or in the home.
From the snowy disruption of a television signal that occurs when a neighbour runs a vacuum cleaner. Such interference boils down to efficient planning on placement of devices. For instance, plan to place microwave ovens away from access points and potential clients. Sadly, all known RF interference issues cannot be planned for because there are just too many them.
The problem with devices such as cordless phones, baby monitors, and microwave ovens, is that they do not contend for the channel-they just use it.
Try setting your WLAN access point to channel 1 or channel 11. Many consumer items, such as cordless phones, operate on channel 6.