GoKawiilDynamic Frequency Selection explains why 5GHz Wi-Fi sometimes drops to 2.4GHz
Routers operating on DFS channels in the 5GHz band must perform a government-mandated radar scan, taking one to ten minutes depending on country, before activating. If radar is detected mid-session, the router exits within ten seconds and avoids that channel for 30 minutes; ASUS and FRITZ! routers handle this differently, with FRITZ! shifting devices to 2.4GHz and ASUS sometimes reducing channel width from 160MHz to 80MHz.
GoKawiil's interpretation of the reporting above, not reported fact.
Most of the 5GHz band consists of DFS channels, so users near airports or military bases may notice periodic connectivity interruptions that have nothing to do with their equipment malfunctioning. Understanding this behavior could help users decide whether to manually pin their router to radar-free channels like 36-48 for more stable connections, trading potential bandwidth for reliability.
- DFS channels require a radar scan lasting one to ten minutes before activating, depending on the country.
- Mid-session radar detection forces a ten-second channel exit and a 30-minute avoidance period.
- Only channels 36-48 and 149-165 are radar-free in the US, while most 5GHz bandwidth involves DFS channels.
ASUS RT-AX86U Pro Router — If you're wrestling with DFS channel switching and radar-triggered dropouts, a modern router with robust 5GHz management like the ASUS RT-AX86U Pro handles these transitions more gracefully. It supports the latest roaming standards and gives you more control over channel settings and bandwidth fallback behavior discussed in the article.
See ASUS RT-AX86U Pro Router on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: engadget.com — Luke James, 2026-11-09
Published there as: “Military radar can make your router switch Wi-Fi channels - here's why”
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