Callisto is glad to welcome his new RF Engineer, Hamzeh Houssein, graduated with an MSc in Electronics, RF and Telecommunications, an European Master degree in Microwave engineering and a second MSc in Fundamental Physics for RF materials. Hamzeh, who has a relevant experience at CNRS as a project engineer, has joined our R&D Department. He is bringing support to the RF team which is engaged in studies and the development of specialised RF equipment for Satellite Ground Stations, particularly for ESA and Deep Space Networks.