Parametric instability in oscillator with delayed load reflection

The stability of stationary modes is studied with relation to perturbation actions of two types: 1) the principal mode, characterizing by slow amplitude and frequency variations of balance condition, 2) RF fields which frequencies have relatively large deviations from that of the principal mode. In the latter case perturbations are composed of satellites pumped by the principal mode; correspondingly the evolution of satellites represents a parametric process.