Interference by 5 GHz Wi-Fi seen on Doppler weather radar
Dynamic Frequency Selection (DFS) is a channel allocation scheme specified for wireless LANs, commonly known as Wi-Fi. It is designed to prevent electromagnetic interference by avoiding co-channel operation with systems that predated Wi-Fi, such as military radar, satellite communication, and weather radar, and also to provide on aggregate a near-uniform loading of the spectrum (uniform spreading).[1] It was standardized in 2003 as part of IEEE 802.11h.
^Touw, Ron (Nov 16, 2016). "Radar Detection and DFS on MikroTik" (PDF). Radar Detect and DFS on MikroTik. MikroTik. Retrieved 4 December 2019 – via YouTube. Decision ERC/DEC/(99)23 adds 5250-5350MHz and 5470-5725MHz with more Tx power but with the added caveat that DFS was required to protect legacy users (Military Radar and Satellite uplinks)
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