A.P. Pudovkin - Dr.Sci. (Eng.), the professor, the head of the department of «Radio Engineering», Tambov State Technical University. E-mail: plabz@mail.ru J.N. Panasjuk - Ph.D. (Eng.), associate professor of «Radio Engineering», Tambov State Technical University. E-mail: pyunikol@rambler.ru S.P. Moskvitin - Ph.D. (Eng.), associate professor of «Radio Engineering», Tambov State Technical University. E-mail: sergey.msk@mail.ru