The DJI AVATA drone comes with three radio modes, according to your geographic location and radio frequency regulations. While the FCC mode (US region) provides a range of up to 10KM, the CE mode (Europe region) has a range of about 2KM. Of course, these distances can only be achieved under optimal conditions, flat ground, no obstacles and low RF noise. After unlocking FCC mode, the VTX power increased from a few mW to over 1W. Remember that 25mW is the maximum unlicensed power you are allowed to transmit in many countries around the world, especially in Europe (CE). This means that performing this range hack without having the necessary permissions to transmit stronger signals would be illegal.
Transmission Power (EIRP):
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Unlocking the FCC mode of the AVATA drone is extremely easy. You just need to create an empty plain text file named "ham_cfg_support", save it without extension and copy it to the root of micro SD card of DJI Goggle 2 or FPV Goggles v2. After restarting the glasses and ON, the drone's FCC mode is enabled, you can enjoy the best range regardless of your location. The hack is permanent and proof for DJI Fly APP.
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How to unlock more range on DJI FPV Goggles V2
DJI O3 Air Unit FCC How to unlock more range