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Tunka-Rex is the radio extension of the Tunka cosmic-ray observatory inSiberia close to Lake Baikal. Since October 2012 Tunka-Rex measures the radiosignal of air-showers in coincidence with the non-imaging air-Cherenkov arrayTunka-133. Furthermore, this year additional antennas will go into operationtriggered by the new scintillator array Tunka-Grande measuring the secondaryelectrons and muons of air showers. Tunka-Rex is a demonstrator for howeconomic an antenna array can be without losing significant performance: wehave decided for simple and robust SALLA antennas, and we share the existingDAQ running in slave mode with the PMT detectors and the scintillators,respectively. This means that Tunka-Rex is triggered externally, and does notneed its own infrastructure and DAQ for hybrid measurements. By this, theperformance and the added value of the supplementary radio measurements can bestudied, in particular, the precision for the reconstructed energy and theshower maximum in the energy range of approximately $10^{17}-10^{18}\,$eV. Herewe show first results on the energy reconstruction indicating that radiomeasurements can compete with air-Cherenkov measurements in precision.Moreover, we discuss future plans for Tunka-Rex.

Tunka-Rex: the Cost-Effective Radio Extension of the Tunka Air-Shower Observatory