terrylewis
Captain
Flight distance : 3517287 ft
United States
Offline
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DJI Lightbridge uses radio channels which are within the ISM bands to transmit video back to the RC. The P3 has antennas in the vertical legs of the landing gear that communicate with the RC on 2.400 GHz - 2.483 GHz. DJI initially implemented 32 channels within this band but later discovered that only 8 channels (13 -> 20) were legally available. The other frequencies are in used by ham radio, satellite comm, or are used by wireless carriers in various countries. Sploodge offered a hack to enable custom selection of the original 32 channels here: http://forum.dji.com/forum.php?mod=viewthread&tid=27147&fromuid=44480
Use at your own discretion! Those channels outside DJI 13 to 20 may not be legally usable. See this spreadsheet for specific channel usage:
https://docs.google.com/spreadsheets/d/1WuKQD3FvbtFnJ6wkFu9DLxhdxHCSsnZPi90CwTGj3ks/htmlview?pli=1#gid=1477125990
In firmware update 1.410, DJI has added an initial check for radio interference and alerts you to check your settings if it senses high interference within the spectrum. The radio settings and signal graph are located in the GO App under HD Video Link Signal Strength .
Configured for the US, the RC has two setting -> AUTO & CUSTOM (European CE restricts Custom Selection). With AUTO, the RC selects the channel it thinks is best/optimum. You may also select CUSTOM and select your own channel. Channels with interference have a tall red bar in the graph. Stable channels are green and show no bar at all. In my area in the US, channel 20 has no interference at all, so I select this channel under CUSTOM and get excellent and stable performance.
The 8 channels that are available for our use can also be used by wireless routers and repeaters, so depending on where you live and fly, you can get significant interference. Our RC defaults to automatic channel selection from channels 13 to 20, and can change channels if significant interference is detected before or during flight.
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