Hooking up 2 BEC without going thru RX

[rcs2022]

Thanks for your input Dr. _paralyzed_, notwithstanding the issue of draining the batts, would it work. Lets say i put in another small 1000mah 3S lipo or nimh receiver pack meaning another source to power the BEC, the grounding to get the proper signal has to do with the negative (-) of the BEC "out" or "in"?