Cosmic radio sources with the peaks of spectral flux density at decameter wavelengths (According to the Grakovo catalog)

Spectral characteristics of extragalactic radio sources of synchrotron emission with spectral flux density maxima located at decameter wavelengths are studied on the basis of the Grakovo catalog data. Physical processes in space that can give rise to such spectra are considered. Angular sizes and possible characteristics of relevant cosmic plasma are determined for a number of sources.