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Originally Posted by Adam Y.
Actually the real name of the rc control signal is Pulse Positioning Modulation. Pulse width modulation is what causes the speed of the motor to change.
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Not really. The controll signal for a servo is a
PWM signal by definition. The width of the pulse is varied to encode the data. With
PPM however, the data is encoded by moving the pulse in time with respect to some reference.
This is also good document on the servo control signal:
http://www.princeton.edu/~mae412/TEX...02/292-302.pdf