  Results of a photometric study of the SW Sex novalike PX And are presented.
The periodogram analysis of the observations obtained in October 2000 reveals
the presence of three signals with periods of 0.142, 4.8 and 0.207 days. The
first two periods are recognized as "negative superhumps" and the corresponding
retrograde precession period of the accretion disk. The origin of the third
periodic signal remains unknown. The observations in September-October 2001
point only to the presence of "negative superhumps" and possibly to the
precession period. The origin of the "negative superhumps" is discussed and two
possible mechanisms are suggested. All light curves show strong flickering
activity and power spectra with a typical red noise shape. PX And shows
eclipses with highly variable shape and depth. The analysis suggests that the
eclipse depth is modulated with the precession period and two possible
explanations of this phenomenon are discussed. An improved orbital ephemeris is
also determined: T_min[HJD]=49238.83662(14)+0.146352739(11)E.
