The illustration shows 80 MHz channels, which is what mesh Wi-Fi uses. When the device detects a radar, other connections are automatically moved onto different channels on the 5 GHz frequency band so as not to interfere with the radar.įive (non-overlapping) channels on the frequency band illustrated above are reserved for radars. This is solved in most routers and other wireless access points by a functionality called DFS – dynamic frequency selection. Simply put: The channels used for radar can also be used by Wi-Fi, as long as Wi-Fi moves as soon as a radar is nearby. This means that wireless networks can create interference for the radar, which is why anyone who produces Wi-Fi equipment is required by law to make sure their equipment does not get in the way of radars. This technology uses some of the same frequencies as wireless internet. Radar technology is used, among other things, in marine navigation to detect obstacles, avoid collisions, and so on. Radar and Dynamic Frequency Selection (DFS) In some cases it is even legally required for them to change channels. You can set up which channel a wireless network should use, but in most cases it is better to leave this decision to the Wi-Fi equipment itself. When (too) many clients are connected on the same channel, this can create Wi-Fi congestion - overload - and very poor performance on the networks. When there are multiple Wi-Fi networks in close proximity to each other, the ideal is for these networks to make use of wireless channels that do not overlap. Wireless internet (Wi-Fi) uses two frequency bands:Įach frequency band is divided into smaller areas called channels. A high density of "competing" networks creates interference.High numbers of connected clients (mobile phones, computers and other devices) on the same Wi-Fi channels lead to congestion.Maritime radar blocks parts of the 5 GHz frequenxy band and increases the likelihood of congestion / overload.Apartment buildings along the coast in areas where there is a lot of ship traffic often struggle with a complex mix of Wi-Fi problems.
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