TETRA combines the advantages of analogue trunked radio with those of digital mobile radio. The result: optimal frequency usage, highest transmission quality for speech and data, maximum security against eavesdropping, as well as flexible networking and connection management. Beyond that digital trunked radio offers full duplex communication, GPS-positioning and also connection to the public telephone network or company telephone systems. The devices can be operated in TETRA radio cells or directly via direct-mode. Riedel provides TETRA base stations for temporary installations, as well as the appropriate Motorola radios including accessories.