Phase 3D (AO-40) Decoder demodulates the telemetry data signal transmitted by the AO-40 satellite (aka Phase III-D) using the PC sound card. The modulation format used by the satellite is quite simple: it's a 400 BPSK Manchester-encoded transmission, frame oriented, no FEC, CRC 16 bit certified, containing 512 bytes of ASCII and binary data. This decoder program can run as Internet Server so the demodulated data can be available world-wide in realtime for everybody!