[en] Preliminary plasma edge turbulence investigations in the Tuman-3 tokamak were carried out by means of a simple homodyne reflectometer. It was found that the high-frequency spectral components of the turbulent fluctuations were drastically decreased just after the transition between L- and H-mode confinement similar to observations in the DIII-D tokamak. Typical phase and amplitude spectra are presented. However, plasma probing with different microwave frequencies shows that high-frequency fluctuation dumping occurs during the L- to H-mode transition only in an edge region, which seems to contradict the DIII-D results. A phase runaway effect was found that is similar to observations in stellarator plasmas. 4 refs, 12 figs