Network Communication / Channels That Fall within the Radar Range (Dfs) are Used
With DFS, a WiFi in the 5Ghz range can perform an automatic channel change if another device is detected on the channel used. This is particularly intended to prevent weather radar systems operating in this frequency range from being disturbed by WiFis. To detect other systems, the channel must be listened to periodically. As soon as a foreign transmitter is detected, a change of channel must be initiated immediately. The selection of the new channel is random and is usually performed by the access point and then communicated to the other network nodes.
The use of DFS channels can lead to interruptions in WiFi availability, since the WiFi switches to another channel as soon as a radar is in the vicinity.
Preventing channels that fall into the DFS range (52–64 and 100–140).