[en] The radar observations of the Lyrid meteor stream at the Odrejov Observatory in 1980 to 1985 are analyzed and discussed from the viewpoint of determining the mass distribution exponent for overdense echoes in the range of 0.4 to 50 s. The mass exponent proved to be almost constant over the whole range of echo durations with s ∼1.58. The contribution of larger particles, as compared with other meteor streams was found to be more significant for the Lyrids. The almost constant value of s indicates a still active contribution of fresh cometary material to the stream. (author). 2 figs., 1 tab., 12 refs