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It will work, but the range will not be as good without ground. I got approx. 100 m with and 40 m without.
Couldn't I just run a wire from the ground on the pigtail to the negative power input, instead of the tiny ground pad? Would that break the controller?
Quick question, is that ground just the negative power input? I'm thinking on the remote I could just run a wire to the negative power but I'm not entirely convinced it wouldn't brick it.