  A thorough analysis of multicolour CCD observations of two modulated
RRab-type variables, XY And and UZ Vir is presented. These Blazhko stars show
relatively simple light-curve modulation with the usual multiplet structures in
their Fourier spectra. One additional, independent frequency with
linear-combination terms of the pulsation frequency is also detected in the
residual spectrum of each of the two stars. The amplitude and phase relations
of the triplet components are studied in detail. Most of the epoch-independent
phase differences show a slight, systematic colour dependence, however, these
trends have the opposite sign in the two stars. The mean values of the global
physical parameters and their changes with Blazhko phase are determined
utilizing the Inverse Photometric Method (IPM). The modulation properties and
the IPM results are compared for the two variables. The pulsation period of XY
And is the shortest when its pulsation amplitude is the highest, while UZ Vir
has the longest pulsation period at this phase of the modulation. Despite this
opposite behaviour, the phase relations of their mean-physical-parameter
variations are similar. These results are not in accord with the predictions of
the Blazhko model of Stothers (2006, ApJ, 652, 643).
