• R. Eichhorn, A. Araz, U. Bonnes, F. Hug, M. Konrad, P. Nonn
  TU Darmstadt, Darmstadt
• G. Schreiber, W. Vinzenz
  GSI, Darmstadt
• R. Stassen
  FZJ, Jülich

During the redesign of the low level RF system for the S-DALINAC, a baseband approach was chosen. The RF signals from/ to the cavity are converted into the baseband via I/Q Modulators/ Demodulators. The advantage of this design was realized lateron, as adaption of other frequencies becomes rather easy. The system, originally designed for 3 GHz superconducting cavity in cw operation is currently modified to control a 324 MHz room temperature CH cavity in pulsed operation. We will report on the rf control system principle, the required modifications and first results.