Scandata faq q6
From The RadioReference Wiki
================================================================== Q6: So how do I decode digital data from the airwaves? First, you tap the Discriminator Output in your scanner. Then build the desired Data Decoder Interface and connect it to the Discriminator Output. Then connect the other side of the Decoder Interface to a com/serial port on your PC. Lastly, run the software that decodes the particular type of signal that you want to decode. In general, it takes different software for different kinds of signals, and I can't possibly cover them all here. I will suggest that you start out with a free program called TRUNKER that decodes the control data of Motorola trunking systems. This is one of the easiest to set up and get working; therefore, it makes a good test "platform" to prove up all your work before you venture into bigger and better things. Motorola trunk systems are fairly common now. TRUNKER and a good set of documentation and limited support for it can be found at the following Web Sites: http://www.geocities.com/CapeCanaveral/Lab/1060/beta.htm or http://web2.airmail.net/lblant1/dfw/digital.htm Apparently it is possible to decode certain kinds of data from the airwaves without a decoder interface - just software! For info on decoding MDT signals with nothing more than a Windows PC and a sound card, check out: http://www.geocities.com/ResearchTriangle/Facility/7646/
Of course, since this article was written, Trunker (and its newer brother UniTrunker) have moved around from place to place. We have links for those 2 programs, and much more, on our Trunked Radio Decoders article.
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