KPD 1930+2752 is a short-period pulsating subdwarf B ( sdB ) star .
It is also an ellipsoidal variable with a known binary period just over two hours .
The companion is most likely a white dwarf and the total mass of the system is close to the Chandresakhar limit .
In this paper we report the results of Whole Earth Telescope ( WET ) photometric observations during 2003 and a smaller multisite campaign from 2002 .
From 355 hours of WET data , we detect 68 pulsation frequencies and suggest an additional 13 frequencies within a crowded and complex temporal spectrum between 3065 and 6343 \mu Hz ( periods between 326 and 157 s ) .
We examine pulsation properties including phase and amplitude stability in an attempt to understand the nature of the pulsation mechanism .
We examine a stochastic mechanism by comparing amplitude variations with simulated stochastic data .
We also use the binary nature of KPD 1930+2752 for identifying pulsation modes via multiplet structure and a tidally-induced pulsation geometry .
Our results indicate a complicated pulsation structure that includes short-period ( \approx 16 h ) amplitude variability , rotationally split modes , tidally-induced modes , and some pulsations which are geometrically limited on the sdB star .