  RV UMa is one of the most extensively studied RR Lyrae stars showing Blazhko
modulation. Its photometric observations cover more than 90 years. The
published photoelectric observations of RV UMa obtained at the Konkoly
Observatory (Kanyo, 1976) were re-considered and completed with previously
unpublished data. During the time interval of the observations the periods of
both the pulsation and the modulation varied within the ranges of 0.000007 and
0.9 days, respectively. We have found a definite but not strict inverse
relation between the pulsation and modulation periods of RV UMa.
