[en] A high-voltage beam deflector driven at a sub-multiple of the cyclotron frequency has been developed to reduce the beam repetition rate of the University of Colorado cyclotron to allow long flight path time of flight measurements. The design uses readily available semiconductor components for control and drive and an Eimac 4CX1000A power amplifier. Accepted beam bursts pass through the deflection plates at a time when the voltage difference and its first derivative are zero so that voltage and phase stability requirements are relaxed and beamline retuning is not needed. (Auth.)