  As part of a project to better characterize comparatively bright, yet little
studied cataclysmic variables time resolved photometry of the three eclipsing
novalike variables EC 21178-5417, GS Pav und V345 Pav is presented. Previously
known orbital periods are significantly improved and long-term ephemeris are
derived. Variations of eclipse profiles, occurring on time scales of days to
weeks, are analyzed. Out of eclipse the light curves are characterized by low
scale flickering superposed on more gradual variations with amplitudes limited
to a few tenths of a magnitude and profiles which at least in EC 21178-5417 and
GS Pav roughly follow the same pattern in all observed cycles. Additionally,
signs for variations on the time scale of some tens of minutes are seen in GS
Pav, most clearly in two subsequent nights when in the first of these a signal
with a period of 15.7 min was observed over several hours. In the second night
variations with twice this period were seen. While no additional insight could
be gained on quasi periodic oscillations (QPOs) and dwarf nova oscillations in
EC 21178-5417, previously detected by Warner et al. (2003), and while such
oscillations could not be found in V345 Pav, stacked power spectra of GS Pav
clearly reveal the presence of QPOs over time intervals of several hours with
periods varying between 200 sec and 500 sec in that system.
