Look into the OP25 project. The wiki has a page about using a usrp to receive and transmit P25 and mentions a chan_usrp channel driver for integration with app_rpt.

Also under hardware there is some documentation of using non-usrp equipment with discriminator and transmitter taps through the sound card.

The project has made big gains according to their checked off list of accomplishments, but documentation seems a little bit lacking.

Brett

KQ9N

On Fri, Dec 21, 2012 at 2:38 PM, Ron Simpson <n6gkj.cm98@yahoo.com> wrote:

From: Ron Simpson <n6gkj.cm98@yahoo.com>;
To: users@ohnosec.org <users@ohnosec.org>;
Subject: Anyone playing with P25?
Sent: Fri, Dec 21, 2012 8:36:11 PM

Would be interesting to see if app_rpt could be expanded to pass P25 data streams. There is alot if info on the net how it works.

A voted P25 ham repeater system would totally rock!

I am just not smart enough to figure out how to do it!

73 all!

Happy Holidays,

Ron N6GKJ

Sent from Yahoo! Mail on Android

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