On Thu, 11 Sep 2003 18:34:19 -0400, you wrote:

>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.

Of course another really easy to get DC balance would be to send each =
byte then send the same byte
inverted - this would ensure DC balance over 2 bytes, which may well be =
enough.

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