I have tried that one.
after 3 1/0 in a row bits the receiver outputs something like a
20kHz square. (Most noise filtered in a 2-20kHz bandpass and
squared)

When I up the baud rate to 19200 (over specs, way over) I can
send balanced characters like GKMNSUVYZ\cefijlqrtx

If I send slower, even Bob's scheme kicks the bucket.
The Ammerman Sync (0x44,0x11,0x45,0x15) is biased towards
zeroes.

The receiver unbalances and the G (0x47)  turns into a C (0x43).
01000111 -> 01000011
How is unclear...

It is not an easy module.....

Kent



> Try sending 0xAA a few times then a two character break (silence) then
> your message. I know that this implies lower than spec lower frequency.
> Try it.
>
> Peter
>
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