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Crestron Best Practices RF Products

Wi-Fi channels 1, 6, and 11 are highlighted in the sample site survey above. Wi-Fi

networks operate on channel 1 and channel 11, and the channel 11 network is further

away. By visual inspection of the graph, note that channel 6 is the most free,

followed by channel 11. Wi-Fi channel 1 has some minor signals above -80 dBm,

which may be fine, but may cause reliability issues for any Wi-Fi devices using that

channel or any 802.15.4 devices using channels 11-14.

The following sections provide examples of various types of interference.

Cordless Phone Interference

The following is an example of 2.4 GHz cordless phone interference. There are very

high peaks of interference at levels of -40 dBm and above. This level of interference

affects all three non-overlapping Wi-Fi channels significantly, and causes

interference issues with any equipment installed in the 2.4 GHz range. In this

scenario, the offending device should be removed or should be replaced with a

comparable device that operates in a different band (900 MHz or 5.8 GHz) to

provide a reliable installation. Wireless performance in the 2.4 GHz range cannot be

guaranteed with outside devices that create such a large amount of interference.

Chanalyzer Capture of a Poor RF Environment Created by Cordless Phones

Microwave Oven Interference

The following is an example of interference emitted from a microwave oven.

A microwave oven does not have the high peaks of interference as does the 2.4 GHz

cordless phone; however, the radiation of a microwave oven affects most channels.

Although the radiation usually does not cause major issues, it can periodically

reduce performance and cause instability.

Reference Guide – DOC. 6689C Best Practices – RF Products • 9

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