V.Yu. Nagorkin - Post-graduate Student, Engineer, Kotelnikov IRE RAS (Moscow). E-mail: altair.92@mail.ru V.A. Atsarkin - Dr.Sc. (Phys. Math.), Professor, Head of Laboratory, Kotelnikov IRE RAS (Moscow) V.V. Demidov - Dr.Sc. (Phys. Math.), Leading Research Scientist, Kotelnikov IRE RAS (Moscow)