Radial velocity measurements were taken of a group of Ap stars using an improved FP-ISOS. Observations were made using the 1.5m TCS on Tenerife in May 1987 and December 1987. The already known rapidly oscillating Ap stars 33 Lib and HR1217 were observed in order to search for radial velocity variations corresponding to the photometric periods found in these stars. Simultaneous photometric measurements were made on HR1217 on the last two nights using the nearby 0.5m telescope. The radial velocity and photometric data sets were reduced using a weighted sine wave fitting routine. Promising results are obtained for HR1217, while results obtained for the other Ap stars observed do not allow any conclusion. Data taken several years ago on Alpha Cir was re-examined and the results obtained are also discussed.