> Last year I did a 1200bps BELL-202 modem for a client using the
> Atmel ATMEGA8 processor running at 6.144MHz.
> TX audio generated via PWM and RX demodulation using fixed-point
> 16bit math as explained on the link below:

Work OK?


> http://www.baycom.org/~tom/ham/da95/d_dspmod.pdf

Gives basic principles well - being able to read German would make it 
even more helpful.
No doubt babelfish can help.


        RM 

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