> The TX side of the project is still fairly primitive--they have a
> hand-coded flow-graph that implements an APCO-25 4-level
> FSK modulator, using an *audio* sink, and then carefully plugging the
> audio into the guts of a physical radio, right at the [snipped]
Soundcard output direct into a TX is something we'd actually like to have
working, but as of yet it hasn't been tested successfully by anyone that I know
of. Getting this to work would be HUGE since it would enable use of TX RF
hardware that has already received FCC certification in various bands...
> So, I decided to adapt what they'd done on the audio side to driving a
> USRP directly (with an appropriate RF card, naturally).
>
Already done! Sorry the docs aren't better. Check out op25_tx.py
Max
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