DJI Lightbridge User Manual - Manual (Page 34)

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poor antenna connection. Run signal diagnostics in the DJI LIGHTBRIDGE App to determine the cause.
1. Remove one of the antennas, place ground system two meters away from air system and launch
DJI LIGHTBRIDGE App. Enter “Signal Diagnostic” page to check the signal strength. Green bars
indicates signal strength is normal, and readings should falls in the range of -20 to 40.
a) One red bar indicates ground system antenna is not working normally. Adjust ground
system antennas orientation or replace the corresponding antennas. If the problem
persists, it may indicate the antennas port on ground system is damaged. Contact technical
support for assistance.
b) Two red bars indicate air system antenna is not working properly. Adjust air system
antennas orientation or replace the corresponding antennas. If the problem persists, it may
indicate the antennas port on air system is damaged. Contact technical support for
assistance.
2. Removed the tested antennas and replace with the remaining antenna. Run the diagnostics
procedure above on the remaining antenna.
4.5 Using Ground System
1. Power on air system then the ground system. Wait until POWER indicator light is on.
2. VIDEO link indicator light on ground system will go solid green, followed by CONTROL link indicator
on air system. VIDEO link indicator on air system will then flash green showing that ground and air
systems are communicating normally.
3. Launch DJI LIGHTBRIDGE App. If the live image appears, the system is working normally.
4. Real time OSD information is available when the flight control system is working normally.
Notes
(1) Position air system antennas downward and ground system antennas upward. Ensure there are no
obstacles between air system antennas and ground system antennas otherwise transmission distance
may be affected.
(2) There will be an alarm if no picture shows or no operation in 30 minutes after ground system
powering on. The alarm will disappeared if you operate the remote control, touch the App screen or
press the power button in the next 10 minutes, or else the ground system will be power off
automatically.