GNU Radio GNU Radio A framework for digital signal processing and software radio.Related Projects¶OP25 depends on a number of free software projects: Project25 - elist discussion forum for APCO Project 25 and related technologies.Defunct Yahoo Groups archives - From the beginning in May 2008 to December 2018.op25-dev mailing list archives - dating back to March 2012.op25-dev - official osmocom mailing list for the project.FAQ - Frequently asked questions and answers.Presentations - some videos, talks and interviews about OP25.Samples - User-collected samples of P25 signals.Old build instructions page - Obsolete page for instructions on building older OP25 version from SVN.P25 in UDP - A protocol for transporting P25 frames over UDP.Debugging - Debugging GNU Radio Segmentation Faults.Signal Scope - Application for exploring signals.Patching WireShark - Patches to !WireShark that allow for the sniffing of P25 traffic.Decoder - A GNURadio program that turns a P25 signal into an audio and message stream.Software - An overview of the project software.Hardware - The recommended hardware for this project.Install instructions - How to install the current version of OP25. Add trunking transmit and receive to simulate a live P25 trunking system.Support for Raspbian running Raspberry Pis.Scripted install to simplify setup for new users.Expose OP25 receive and transmit functionality to GRC via new hier blocks and XML.Create a 'live CD' so that people who don't want to install linux can simply boot from the CD then plug and play.No need to implement this as there are plenty of other solutions out there already that are quite good. Locate and track the locations of P25 mobile stations.Support for newer P25 Phase 2/TDMA systems (a receiver is implemented, as of March 2015).P25 Trunking support - capture, track, and log traffic on a P25 trunked radio system.Incorporate the use of both the C4FM demodulator and the 'CQPSK' demodulator.Provide a practical logging service for P25 monitors.Implement an IMBE decoder to recover voice traffic.Analyzing the various security issues and demonstrating the insecurity of P25 systems.Extend the !WireShark sniffer to allow sniffing of P25 message.Implement a decoder which takes P25 signals and produces a message stream.Understand P25, the physical layer and the messages being passed over the air.In increasing order of difficulty these are: Project Tasks♯rom here we have a number of tasks that immediately suggest themselves. A short video that demonstrates OP25 transmitting audio from a PC's microphone input, then to a USRP being received by a GRE scanner is available on Youtube Youtube.
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