Two events demonstrating periodic narrowband millisecond pulsations of radio emission both in intensity and polarization degree are analyzed. Large time delays between L- and R-polarization components are found. The delays display frequency dependence, which is a power law with the exponent -2.5+/-0.8. The radio emission is shown to be generated as unpolarized by plasma mechanism at the second harmonics of the upper-hybrid frequency. Observed oscillations of the radiation polarization degree arise due to group delay between extraordinary and ordinary modes along the line of sight. Physical parameters of the emission source and "delay site" are determined within the proposed model.

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