Radar scanning in DFS channels
The Edge system selects DFS channels by default, as these channels are less likely to contain
traffic than the universal channels. When a DFS channel is selected, the system must carry out
a channel scan to make sure that it is clear of radar. A scan occurs whenever the transceiver is
going through it's connection sequence and also periodically while it is in use.
Radar scanning usually takes one minute per channel. Also note that with the Europe setting, channels 120, 124 and 128 take 10 minutes to scan. You will see the status lights on the transceiver flash blue when a channel scan is occurring. The LEDs will flash blue/purple or blue/yellow if the device is starting up and acquiring PTP and sync lock at the same time. If radar is detected in a channel while the transceiver is connected to the system, transmission will drop into the backup channel. You will see a double red flash on the transceiver status light when radar is detected in a channel.
Note: If you have not selected a backup channel, the transceiver will not transmit when radar is
detected. Backup channels are restricted to non-DFS channels to reduce the risk of non-transmission.
The EHX software will report scanning for radar activity with explicit messaging.
If the transceiver is in standalone mode and radar is detected, the device will stop transmitting.
Note: Non DFS channels do not require a channel scan or a backup channel.
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