Terrestrial Trunked Radio (TETRA)

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Terrestrial Trunked Radio (TETRA)
Frequencies 380 MHz,430 MHz
Frequency Range 380 MHz - 430 MHz
Mode NFM
Modulation PSK
ACF Frame: 56.67 ms, Slot: 14.16 ms, Superframe: 1020 ms
Emission Designator
Bandwidth 25 kHz
Location Worldwide
Short Description TETRA is a professional mobile radio and two-way transceiver (walkie-talkie) specification
I/Q Raw Recording Download file
Audio Sample

TETRA is a professional mobile radio and two-way transceiver (walkie-talkie) specification. Formerly known as Trans-European Trunked Radio. Used extensively in Europe, especially Great Britain and Germany. Modulated with π/4 DQPSKDifferential Quadrature Phase-Shift Keying. Runs on 18000 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. with 36000 bpsBits per second (bps) maximum user bitrate. TETRA is not to be confused with Tetrapol.

Several levels of encryption are offered, however, many networks are unencrypted. For unencrypted networks, several software projects (see links below) exist allowing decoding of low-level signaling and full voice decode. There is also a basic Wireshark GSMTAP dissector and on some networks SDSs (short data messages) can be decoded.

Encryption specification is available only with NDA from ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards. link (requires JavaScript)



TETRA Encrypted Voice (Decoded but not Decrypted):


Typically between 380 MHzMegaHertz (MHz) 10^6 Hz and 430 MHzMegaHertz (MHz) 10^6 Hz.

Decoding Software[edit]

Hobby Level Software

Professional Software

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]