OP25 is a not-for-profit project to bring together folks that are interested in implementing APCO P25 using a software-defined radio. Our goal is to build a software-defined analyzer for APCO P25 signals that is available under the GNU Public License (GPL).
APCO Project 25 is the digital communications standard used by many police and emergency services throughout the world. Most notably the US, Canada and Australia deploy systems based on P25. Compared to existing analogue systems P25 offers improved spectrum use, coverage and flexibility. Provision is made to ensure the confidentiality of traffic, to allow the use of trunking and the provision of data in addition to voice services.
Hardware scanners such as the Uniden BCD996T offer APCO P25 functionality but software-defined radio (SDR) offers significantly improved flexibility. For example, software radio approaches can receive many channels at once, handle both voice and data (including the trunking control channel), decrypt encrypted traffic when the key is known and log traffic to disk for later analysis. With the right software an SDR is a powerful analysis tool for debugging and monitoring of P25 networks.
That's the sales message. The reality is software-defined radio isn't yet as simple as the plug-and-play of hardware radios. You will need a lot of patience and a fair amount of software skills to get working. To get an idea of the work involved you can check out Hardware for Your Software Radio By Stephen Cass. In that sense this really is an amateur radio project and requires the same kind of skill and dedication but we've a few people who will help out if you run into trouble. A project like this needs many different skills so even if you're not technical you maybe able to help in other ways.
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.
From here we have a number of tasks that immediately suggest themselves. In increasing order of difficulty these are:
As all Wiki pages, this page is editable so these ideas are not fixed in stone. Developers can simply click on the "Edit this page" link at the bottom of the page (although it is worth familiarizing oneself with Wiki formatting beforehand).
Please realise that this is developmental software and it does take a fair degree of skill and understanding of hardware and software development under Linux to get it working. The mailing list op25-dev is there to help people that try to help themselves.
Email Lists ¶
OP25 depends on a number of free software projects:
A similar project has been undertaken by Project 54 at UNH
All wiki contents are provided under the terms of the Creative Commons Attribution-ShareAlike 3.0 license. Authors that wish to contribute to our wiki expressly agree that their contributions can be re-distributed on these terms. Redistributors must credit the OP25 project as the original source of any re-distributed material.