Abstract: Modulation device for an RF power amplifier. A correction of the modulation pulse is defined from the non-linear control characteristic of the RF power amplifier (2) such that the influence on the desired output pulse shape caused by the non-linear control characteristic is first compensated for without involvement of a controller. When, due to disturbances acting on the amplifier, changes of the control characteristics or of the RF gain and, consequently deviations in the pulse shape and power occur, then the controller corrects these deviations during the pulse transmission. The modulation device is used in RF transistor power amplifiers having a pulse modulation input.