[en] A method and equipment for the fluctuation spectral analysis of microwave radiation are described which has been applied to the study of the probability characteristic of thermal and epithermal radiation of a plasma in the ''Uragan'' stellarator. Quantitative data about statistical properties of the microwave radiation were o btained by means of comparing microwave noises radiated by the plasma with a standard source of the microwave radiation. The results of an analysis of the microwave noise radiation accompanying current and ion-cyclotron heatings of the plasma in the stellarator are presented. The nature of a high-frequency plasma turbulence is discussed