What is the difference between PPM and PCM?
PPM stands for Pulse Position Modulation, and PCM stands for Pulse Code Modulation. Here is a basic comparison between the current crop of receivers on the market. PPM Our traditional “FM” is still a framed signal that the rx processes. The only difference is that it is an analog based signal. So what happens is that any signal received within the “frame” for that channel is processed. This is the famous glitch where the servos are sent screwy for an instant. The advantages of FM are low cost. Also the resolution (in theory) can be very high because there is (theoretically) no loss of signal during the conversion to digital. This is only true with analog radios, though. Digital radios put PCM and PPM on a level playing field as far as resolution goes. Disadvantages – The “glitch”. This spastic movement of the servos when a bad signal is decoded is why many people prefer to switch away from traditional PPM. Also the resolution that many of the older radios had is removed by the new “dig
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