The OP  is just sending normal ASYNC over the air.

He is encoding bits within a byte in a pseudo-Manchester scheme to ensure
long term 0:1 ratio is 50% on the  wire to keep the data slicer happy.

The user is depending on  the receiver recognizing the start bit correctly,
which is problematic at best. I have written a document on piclist.com
(http://www.piclist.com/techref/microchip/ammermansync.htm) that outlines
how you can use a specially formatted preamble to assure byte
synchronization. Hopefully this prefix won't confuse the data slicer too
much trouble.


Bob Ammerman
RAm Systems

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