Improvement of tetrode power amplifier efficiency by adding harmonics to the carrier oscillation and energy savings resulting from volume-dependent Pulse-Duration Modulation (PDM) control

The method of improving efficiency by adding the 3rd harmonic to the carrier oscillation is common in triode power amplifiers. For a transfer of this technical method to modern high-power tetrodes, the circuitry for the generation of 3f current was fundamentally changed. A qualitative as well as quantitative description of the functioning is given with the aid of diagrams. The introduction of pulse-duration modulation into transmitter technology makes possible an economical application of a volume-dependent carrier control method. The method is distinguished for a special carrier control characteristic in relation to the saving of energy and for improved transmission performance achieved by use of a controlled clipper.