A.B. Odobesko - Research Scientist, Kotelnikov IRE RAS (Moscow). E-mail: arty@cplire.ru A.A. Maizlakh - Engineer, Kotelnikov IRE RAS (Moscow) S.V. Zaitsev-Zotov - Dr.Sc. (Phys. Math.), Head of Laboratory, Kotelnikov IRE RAS (Moscow)