Experiment COLD . ... The technical basis of Experiment Cold was a new, extremely low noise cooled radiometer (cryoradiometer) (Berlin, Gassanov et al., 1982) at a wavelength of 7.6cm; with the development of this radiometer , an important step was taken towards lowering the noise in the radio telescope – radiometer system at the RATAN from 100 – 150 K to 30 – 40 K. This transition required a new approach to the design of both the radiometer and the ... Cooling" the Antenna . ...