Graupner JR SPCM.

Hi All.
Before the days of 2.4GHz, Transmitters used to talk PPM, PCM or serial to the RF modules.

Does anyone know how the error detection mechanism works on this protocol ?. e.g. CRC etc.

If you have an old JR transmitter laying around in your junk pile how about some reverse engineering.

The protocol basics are detailed in the attached .pdf.

Cheers.