RS Oph PDS. The AAVSO light curve from 1934 to present had solar and eruption gaps filled so as to produce a uniformly sampled light curve and then a PDS. The shape of the PDS is characteristic of other CVs (1/ f noise perhaps with a break to white noise at the lowest frequencies) except that the power keeps rising to incredibly low frequencies. The break to white noise might well be insignificant as being simply one realization of the light curve producing deviations from some long-term average PDS shape. The shape of the PDS is also characteristic of ordinary variations on red giant stars likely caused by convection cells of all sizes.