Josh Bardwell has several YT vids where he tests DJI fpv system (all very good vids) and you definitely get visual cues tell when the signal is weak. It seems that whereas analog feed fuzzes out the digital feed gets pixelated and blurred as bitrate drops; it's like sections of the feed drop from 720p to 240p. Apparently people get unobstructed ranges up to 6-7 miles with good RSSI but the link failsafes right around that point regardless of link quality.
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