> Not a phone-line modem. The channel bandwidth is about 20 kHz.
>
> Given the number of responses and not a single "hit", I shall assume that=
 a
> 9600 baud pure-FSK modem IC does not exist. :)

This may be useful

        http://www.amsat.org/amsat/articles/kd2bd/9k6modem/

As may this

   http://www.symek.com/g/fsk9601.html

Useful background

    http://www.avrfreaks.net/index.php?name=3DPNphpBB2&file=3Dprintview&t=
=3D53752&start=3D0


               Russell
--=20
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