Telemetry using the audio channel of a video transmitter, used for flying a model plane in FPV (First Person View). The modulation is based in the Bell 202 modem and is modulated using AFSK at 1200 bps. On top the AX.25 protocol is implemented. On the receiver side no additional hardware is needed (besides the video transmitter), the audio channel is simply fed into the sound card and demodulated using the AGW Packet Engine. A small application was written to read the payload data from AGWPE and display them. More information at vrhome.net
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