| 摘要 |
A dither-tuned microwave tube apparatus having approximately triangular frequency variation with time includes a movable, frequency controlling tuning element for an electromagnetic cavity. The tuning element is reciprocally moved between two extremes of travel in response to a single rotation of a shaft. A gear train means drives the shaft in a manner such that the tuning element rapidly reverses as it approaches each extreme of travel. The gear train means has two cycles of speed variations during each reciprocation cycle of the tuning element. In one embodiment the gear train means comprises an identical pair of meshing centrally driven elliptical gears, while in a second embodiment the gear train means comprises an identical pair of elliptical gears driven at their foci and a 2:1 gear reduction.
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