Loss of Control Link
In case of loss of control link, the Radio Failsafe will trigger, and the drone will automatically engage the RTL flight mode.
Visual warnings will appear on both the Radio Control and the Ground Control Station displays, alerting of such situations:
Figure *. Visual warnings
Main Causes for a C2 Link Loss
Below are listed the primary causes for a C2 link loss:
- Persistent external 2.4 GHz radio interference: This may be caused by the presence of a nearby 2.4 GHz radio beacon antenna.
- Drone gets out of range: The C2 link range may be reduced due to obstacles in the line of sight under current flight conditions.
- Improperly tightened antennas: Ensure antennas on the Remote Controller and/or Drone are properly secured.
- Remote controller power loss: The Remote Controller may turn off due to running out of battery.
This Radio Controller model does not send any feedback signal back to the flight controller when it turns off.
C2 Link Loss + GPS Degradation
The RTL flight mode depends on GPS sensor readings for its operation. In case of a combination of C2 link loss and degradation of GPS readings, the Navigation Failsafe will trigger. The drone will automatically land by vertically descending at the position where the Navigation Failsafe was triggered.
The Navigation Failsafe is typically triggered when a continuous GPS glitch is detected. GPS glitches may occur for multiple reasons, including:
- Flying with low or no sky visibility (e.g., in a deep valley).
- Inconsistent power supply to the GPS module due to internal electrical failure.
C2 Reacquisition
If the C2 link is reacquired after a C2 link loss, the drone will remain in RTL flight mode unless the pilot commands a new flight mode by moving the SA, SC, or SD switches.
In the event that the Radio Controller is turned off, the time lapse for reacquisition after turning it back on is less than 5 seconds.