4 ms·

The problem with the 5 GHz band is that it can be turned off any time because of radar: https://en.wikipedia.org/wiki/Dynamic_frequency_selection https://en.wik

• simoncion 4y ago
  Only certain slices of it. The article you linked to mentions the frequencies in the US that must use DFS. This table in the article _it_ links to goes into much more detail. <https://en.wikipedia.org/wiki/List_of_WLAN_channels#4.9%E2%80%935.0_GHz_(802.11j)_WLAN https://en.wikipedia.org/wiki/List_of_WLAN_channels#4.9%E2%8...> Look for the cells that contain "DFS" to see on which channels APs are required to channel hop if they believe they have heard radar. In my personal experience, channel hopping works fine.
• exikyut 4y ago
  Ooooh. Now I wanna find out how I can fly over an area with a drone and make pictures like the example! On a somewhat smaller, more theoretical note, I wonder what "a radar signal" is as far as a Wi-Fi SoC is concerned. Sounds like the wild-west, much-trickier-to-block counterpart to the old deauth packet attack. At least the FCC/etc can get shouty if needed... Edit: Oh, right, it only goes offline if channel selection is manual. And presumably radar only uses the one band (?) so you couldn't flood it out or play cat and mouse. Hmph, this is actually well designed. Given that this requires pretending to be a radar you might as well switch to a smaller pot of hot water and just get a 5.8GHz signal jammer.