[en] The analysis of the frequency-angular spectra radiation, arising at the charged particle passage of the arbitrary number of plates in the pile, depending on the plate parameters and particle energy, is carried out. The cases, when the pile consists of one or several plates, are discussed. It is shown that in case of a thick plate or when the number of plates in the pile is rather large the radiation can be divided into transition and the Cherenkov radiation. Otherwise this separation is impossible. It is concluded that transition and the Cherenkov radiations result from the wave interference, arising at the interaction of medium electron with the flying charged particle