  Oscillating shapes of the primordial bispectrum are present in many
inflationary models. The Planck experiment has recently published measurements
of oscillating shapes, which were however limited to the efficient frequency
range of the used analysis method. Here we study the KSW estimator for
oscillations in the CMB bispectrum, that allows to examine arbitrary
oscillation frequencies for separable oscillating bispectrum shapes. We study
the precision with which amplitude, phase and frequency can be determined with
our estimator. An examination of the 3-point function in real space gives
further insight into the estimator.
