ORIGINAL: rhklenke
ORIGINAL: Warwick Laken
[snip]
But it does beg the question: why was the signal voltages lowered on the new 2.4 receivers.
Because these systems are implemented on state-of-the-art ICs. These days, nothing current runs at 5V any more and even 3.3V is getting used less frequently. Some high-end processors run as low as 1.2V or even 0.8V internally. With lower core voltages, it get expensive, in terms of chip area, to bump the I/O back up to 3.3V much less 5V. A cheaper solution is to have the other stuff run at lower voltages. All of the Futaba servos are OK with the 2.7V signal levels. Most of the JR and HiTech servos seem to be OK too. Some of the other stuff like sequencers and electronic valves are lagging behind...
Bob
This is the best explanation I have seen written. Very simple.