RECS-80 uses pulse position modulation and RC-5 uses bi-phase.
2.
This PWM signal is sometimes ( incorrectly ) called Pulse Position Modulation ( PPM ) ( e . g.
3.
The modulation formats recognized for PHY I and PHY II are on-off keying ( OOK ) and variable pulse position modulation ( VPPM ).
4.
In modern times, pulse position modulation has origins in fiber optic communications, deep space communications, and continues to be used in R / C systems.
5.
The period of 20 ms ( 50 Hz ) come from the days where the signal was encoded in PPM ( Pulse Position Modulation ) format to be sent over the air.
6.
Typical radio control systems for radio-controlled models employ pulse width modulation ( PWM ), pulse position modulation ( PPM ) and more recently spread spectrum technology, and actuate the various control surfaces using servomechanisms.
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