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If you were just looking for interference in general, not specifically radar signals triggering DFS channel switches, a 5GHz spectrum analyzer, such as a MetaGeek Wi-Spy DBx, would do. However, a spectrum analyzer mostly just graphs how much energy it sees on various frequencies over time, without actually being able to differentiate between Wi-Fi, radar, ...


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To check for non-WiFi signals, you generally can't use the built-in hardware. The hardware that's built into your devices only does WiFi and it can't detect any other signals. Some provide some "interference" metric, but that's it. To properly check, you need some sort of generic receiver, preferably a spectrum analyzer. A relatively cheap option ...


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