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TETRA is an acronym for TErrestrial Trunked RAdio.

Tetra is an open voice standard developed by the European Telecom Standards Institute (ETSI) and is in use primarally overseas and in Europe. It uses a 4-slot TDMA channel. Tetra systems use the TETRA Control Channel.

TETRA uses by default air interface strong encryption and, as a result, there is no scanner available that can monitor TETRA Voice.

TETRA decoders

  • osmo-tetra - is a open source decoder using gnuradio and USRP1/2 for signal processing. The osmo-tetra project aims at implementing the sending and receiving part of the TETRA MAC/PHY layer. You can learn more about how TETRA works on its lowest level, but no decryption. Currently, it can receive, demodulate TETRA downlink signals of real-world TETRA networks display information about SYNC, SYSINFO, MM and CMCE PDUs.