"Drink" wrote in message ...
For the Group: Is it plausible to pass data through a repeater above or
below voice just like the subaudible tones?

It is possible, but you asked the right question - is it PLAUSIBLE?
In other words, does it make useful or economic sense for your
application?

What useful information would you be sending while you were talking?

Are you willing to come up with your own modem design? (as I doubt if
there are any "off-the-shelf" designs you are going to be able to use)

- Stewart