Yes this is how I do it for now at 2400 bauds, I will upgrade to a Manchester routine as soon as I'm sure the communication is possible.

But even without my transmitter powered, I always receive random data. That's why I think there's another source around. I don't have any field strength meter, but the receiver chip as a pin who serve to indicate the level of the incomming signal. I put this pin in a ADCIN pin of my PIC and mesure it periodically. With my transmitter ON the reading is about 90-100 and without transmitter I still read around 25-30 and receive random data.

I also made some test with SERIN2 and a wait ($AA,$AA) modifier. Then the random data did not enter but mine is not read all the time I said about 1 time on 25. This is another fact that make me think I'm not the only one using this 433.92MHz Band...

Today I'm gonna take a walk and find a place where I don't receive any interferance and make some test there. I just wish I don't have to go 250 km far at the cost of gaz .