DFS Wi-Fi channels are invisible to phones

import Detail from "../../components/Detail.astro"; While debugging [Bluetooth and Wi-Fi fighting over 2.4GHz](/posts/bluetooth-wifi-coexistence), I hit a confusing one: my router was happily broadcasting a 5GHz network, my laptop was connected to it, and yet my phone's Wi-Fi scan flat out refused to show it. Same SSID, same room. The culprit (I think) was DFS [Dynamic Frequency…