D.V. Aleksandrov - Researcher, Kotelnikov IRE RAS (Fryazino Branch). E-mail: diman1234@list.ru M.N. Dubrov - Ph.D. (Phys.-Math.), Leading Researcher, Kotelnikov IRE RAS V.V. Kravtsov - Research Engineer, Kotelnikov IRE RAS (Fryazino Branch)