. The Bell System technical journal . gure 71 shows a performance diagram for a typical 2K25 oscillatoroperating in the coupler of P^ig. 70. The reference plane for the diagram is J. B. Fisk, H. D, Hagstrum and P. L. Hartman, The Magnetron as a Generator ofCentimeter Waves, B. S. T. J. Vol. XXV No. 2, pp. 167-348 (April, 1946). REFLEX OSCILLATORS 573 not the plane of the grids of the oscillator but is instead a more accessiblereference plane external to the tube, in this instance the plane through thewave guide perpendicular to its axis which includes the tube probe. It willbe observed th
. The Bell System technical journal . gure 71 shows a performance diagram for a typical 2K25 oscillatoroperating in the coupler of P^ig. 70. The reference plane for the diagram is J. B. Fisk, H. D, Hagstrum and P. L. Hartman, The Magnetron as a Generator ofCentimeter Waves, B. S. T. J. Vol. XXV No. 2, pp. 167-348 (April, 1946). REFLEX OSCILLATORS 573 not the plane of the grids of the oscillator but is instead a more accessiblereference plane external to the tube, in this instance the plane through thewave guide perpendicular to its axis which includes the tube probe. It willbe observed that the sink margin in the case illustrated was equal to the frequency at which this diagram was obtained, the minimum sinkmargin permitted by the test specification is The variation in thismargin results from a variety of causes. As shown in Section III the sinkmargin is determined by the ratio of the total load conductance to the smallsignal electronic conductance. The total load conductance consists of the U >|. 1 M SECTION ON A-A Fig. 70.—A broad band coupling designed to connect the 2K25 to a 1 x § wave guide conductance representing the resonator losses and the conductance arisingfrom the wave guide load transformed through the coupling system. Hence,the coupled load will be subject to variations in the loop dimensions, thecharacteristics of the couphng line and the transducer. The resonator losswill differ from tube to tube because of the variation in the heating of thegrids and resonator by the electron stream, and there will be variations aris-ing from other causes. The electronic conductance varies from tube totube primarily because of the spread in beam current and secondarily as aresult of such factors as variations in the modulation coefficient of the gaps,non-uniformities in the drift space causing a spread in the transit time and 574 BELL SYSTEM TECHNICAL JOURNAL the like. The sum total of these variations necessitated the maintenance ofan
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