It is shown experimentally that detections ensitivity can be raised by 1.5 - 2 orders of magnitude when the response to external microwave radiation is registered in the reflector circuit of the generating klystron as compared to response registration in the resonator or cathode circuit. This is explained by the fact that the reflector - circuit response is as strong as that in the resonator circuit, but the noise current(for shot noise) is 3-4 orders of magnitude lower.
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