This contribution describes the upgrades to be implemented in the RAEGE Yebes VGOS receiver.
Meanwhile, the Yebes radio telescope is operating with the VGOS receiver designed for the RAEGE Santa Maria station. The goal of these upgrades is to improve the overall receiver performance in terms of sensitivity, band-pass ripple, and phase calibration stability.
For these purposes, the following components were redesigned and improved: 1) a new QRFH, with better input matching, 2) new balanced LNAs, with lower noise temperature and better input matching, 3) new cryogenic 30-dB directional couplers, more reliable than COTS units, 4) a new CDMS to improve the accuracy and stability of cable delay measurements, and 5) a new PhaseCal Antenna Unit with a new pulse generator and level control of calibration signals. Additionally, a new frequency converter is ready to be used with the R2DBEs. The upgraded receiver is expected to be installed in June 2022.