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[OMK]

...and the answer is.............

"C"

Ta-da!

Hey, hang on a cotton-pickin' minnit!..... I heard a cough. Someone in the audience... your mate... coughing the answer!
CHEAT!

Nice units though. Personally, if it were my design I'd do something about the cosmetics. But the performance is pretty damn good. You'd be hard-pressed to beat the low-rev torques. Smoother than a baby's bum.

[malcolmfrary]

Hi Wombat
Just so and you are quite right. 
I found an article on a web page long ago where the problem was exactly that (using a CMOS input).  The cure was a pull-up resistor to kid the system that RX output voltages were correct.
Computerised ESCs should be relatively unaffected by minor supply voltage variations, unlike the old 409 based circuits which relied on an analogue voltage comparator.