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We present the results of collaborative observations of three RR Lyrae stars(CX Lyr, NU Aur and VY CrB) which have a strong Blazhko effect. This work hasbeen initiated and performed in the framework of the GEOS RR Lyr Survey (GroupeEurop\'een d'Observations Stellaires). From the measured light curves, we havedetermined the times and the magnitudes at maximum. The times of maxima havebeen compared to ephemerides to obtain the (O-C) values and from a periodanalysis of these (O-C) values, the Blazhko period is derived. The Blazhkoperiods of NU Aur (114.8 days) and VY CrB (32.3 days) are reported here for thefirst time and a more accurate period for CX Lyr (68.3 days) has been obtained.The three stars are subject to strong Blazhko effect, but this effect hasdifferent characteristics for each of them. When we compare the variations ofmagnitude at maximum and variations of (O-C) values with respect to the Blazhkophase, these variations are either in phase, in opposition, or even inquadrature.

GEOS RR Lyr Survey: Blazhko Period Measurement of Three RRab Stars - CX Lyrae, NU Aurigae and VY Corona Borealis