"dave d" wrote in message ...
Well, I guess I could have done a little searching first: it seems that
homebrew digital is not permitted in either service, any digital formats
must be type-accepted. Does anyone know if there is any business service
that allows non-standard digital transmissions?

The no-license MURS service allows 2W transmitter power, gain
antennas, and voice/data.

Some work has been done on generating a new protocol standard,
optimized for today's applications over medium speed (1200-19.2Kbps)
RF links:
http://groups.yahoo.com/group/murslink

- Stewart
http://groups.yahoo.com/group/MURS-OPEN