ORIGINAL: Charlie P.
And all of those features will consume power for the airborne sensors. So, without telemetry perhaps, the rx voltage would have been fine throughout the flight.
I'd be shocked if the available telemetry sensors draw enough power to make the difference between having and not having a brownout.
Telemetry is a useful and forward-thinking feature. If I were in the market for a new radio, I'd be looking hard at what is available from Hitec and Spektrum. Telemetry is the feature that will drive existing 2.4ghz users to upgrade their radios.