| 摘要 |
A signal generator includes a piston-in-waveguide attenuator coupled to a tuned circuit, a control voltage whose magnitude depends on the position of the piston in the waveguide of the attenuator being produced from a potentiometer and applied to a variable capacity diode in the tuned circuit. Changes in the reactance of the tuned circuit caused by the proximity of the piston are compensated by changes in the capacity of the variable capacity diode, maintaining a constant generated frequency.
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