Frequency modulation of a Gunn-effect oscillator by magnetic tuning

Frequency-variation experiments of an X band Gunn-effect oscillator are described. Frequency ranges of 600 MHz at 9300 MHz and 1200 MHz at 10900 MHz are covered with the aid of a ferrite-filled coaxial cavity and an applied static magnetic field up to 4900 Gs. A qualitative explanation of the covered bandwidth is given by the variation of permeability.