Greg,
Look at James Miller's considerations in designing the 9600 packet
physical layer at
http://www.amsat.org/amsat/articles/g3ruh/109.html
It seems to me that most FM radios with a "9600" connection could both
modulate and demodulate direct FSK (and probably GMSK).
Thanks
Bruce
On 12/13/2014 05:08 PM, Gregory Maxwell wrote:
> Maybe, the almost complete absence of inexpensive raidos with SSB for
> VHF/UHF is a barrier but on the other hand devices like bladerf and
> hackrf have made direct SDR a lot more reasonable...
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