Abstract
Some particular aspects of the interaction between a gravitational wave (GW) bar antenna and a microwave superconducting cavity used as a motion transducer were investigated. Under certain conditions the coupling of the transducer to the antenna causes mechanical oscillations in the antenna. Two different mechanisms responsible for the effect of mechanical instability are discussed. Requirements for the design of the microwave read-out system providing stable low-noise operation of the GW detector are considered.
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