History of Science and Engineering Annotation << Back Laboratory of Radio Astronomical Receiving Devices Celebrates 25 anniversary Ipatova I.A. Mardyshkin V.V. Mikhailov A.G. Scientific and practical achievements of the Laboratory Radio Astronomical Receiving Devices on the eve of its 25th anniversary are presented. The history of developing the equipment for the radio astronomical network «Quasar» begun in 1986, is described. Within this work the pre-production models of high-sensitive ultra low-noise cryo electronic radiometers have been designed and produced. Electromagnetic condition in place where the observatories were supposed to erect were investigated. Successful operating experience of model and experimental samples proved correctness of those technical decisions. Now necessary upgrade of the equipment is carried out, amplifier-converting channels are changed for the purpose of widening of reception band. The monitoring and control system is upgrading now in 2003-2006 essentially new control system has been developed. Keywords: UHF receiving complex; radiometer, noise temperature; radio telescope; high-sensitive; low-noise amplifier; cryo radiometer Contacts: E-mail: ir.ip@yandex.ru Pp. 43-53.