I know it's a not very easy "argoument" the "send midi data on air", but I found some informations that could return good. For example, using a ibdrid RTX and a Manchester decoder you can to build a digital data modem, I found an ibrid SMD RTX, a Manchester decoder scheme, but, after to initiate to build the device, I'd like to know if somone can tell other information. I can send all things I have got (schemes and links) about my proget by mail. bye