Noise performance of frequency- and phase-locked CW magnetrons operated as current-controlled oscillators

Low-power continuous wave "cooker" magnetrons driven from industrial-quality switch-mode power supplies have been frequency locked by driving them as current-controlled oscillators in a phase-lock loop (PLL). The noise performance of these frequency-locked oscillators is reported as a function of heater power. The injection of -30- to -40dB signals derived from the reference oscillator of the PLL into the magnetron\´s output waveguide while the anode current is controlled by the PLL is shown to phase lock the magnetron\´s output. Results for locking performance are presented.