The Super Trunking Scanner production backend uses a USRP1 with a DBSRX2 daughterboard for radio reception. This photo shows that unit with some extra antennas installed for another daughterboard.
This is all running on a normal (but beefy) Linux box. A fair amount of CPU power is required to keep up with the decoding work.
On the backend, a custom trunking message decoding and audio logging program built on top of the GNU Radio project. It takes the raw I/Q data arriving from the USRP (about 115 Mbps, 24 hours a day) and saves it to separate calls.
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Unlike ordinary scanners, this system receives all channels simultaneously and can record all of them in parallel if necessary. Even if multiple talkgroups are active -- police and fire, for example -- you'll still hear every call.
The development of this project was documented in a series of web log posts. Start here for the details.
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