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PPM Encoders are needed when there is no existing ppm encoded pulse stream available from an R/C receiver to send pilot commands to the autopilot.
See RC Receivers and Radios for more information, most R/C receiver provide a ppm sum stream output and don't need such a encoder.
ATmega PPM Encoder
ATmega (ATmega168 or 328) MCU-based board with a number of features.
MeekPE PPM Encoder
Low-cost, MCU-less board (with hex inverting Schmitt trigger).