A noisy video signal really makes it much harder to race or fly a model with FPV. Recently I've seen a spate of racing drones coming out of China that have very poor video and in this video I take a look at one (the BeeRotor 130). The biggest problem appears to be the design of the PDB which routes the video signal very close to ESC wires carrying very high currents.
Stay tuned and we will see if removing the PDB and rewiring the quad fixes the problem.