Research of the Uncertainty of Measurement Frequencies and Definitions of the Frequency Signal in the Waveguide with Respect to Power. - Valerii Semenets; Igor Zakharov; Maryna Serhiienko; Vladimir M. Kartashov; Daniel Hernandez Balbuena; Marina Kolendovska; Wilmar Hernandez; Juan Ivan Nieto-Hipólito; Vera Tyrsa (IECON, 2019)