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According to this thread, the answer is that the DJI FPV system doesn’t natively support BuddyBox. However, they do mention that you may be able to use an R-XSR, and feed the SBUS output of the Air Unit into the SBUS in pad to use it as a backup receiver.


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It appears that this issue where perfectly good and speedy SD cards are declared "slow" in DJI Air Units, as is documented on the DJI product forums. This is an issue for many DJI FPV system users.


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For people who find this in the future. It is possible: https://oscarliang.com/dji-fpv-system-fcc-700mw/ But remember; don't break the law!


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The difference is due to regulation - in the EU, the permitted radio power output is lower than that allowed under the FCC regulations, which results in reduced range. Without a licence from your countries telecoms regulator, it would be illegal to operate the FCC equipment in Europe. It is likely to be a software setting, but there might be hardware ...


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