| 摘要 |
PURPOSE:To improve the accuracy of preset by prestoring the content for correcting the malfunction due to the mechanical clearance during the frequency exchange in a memory for driving a pulse motor. CONSTITUTION:A tuner for varying the resonance frequency of a cavity resonator 6 is driven by a pulse motor 12 through a tuning axis 10, screw wheel 11 and a drive gear 14. When varying the tuning frequency fo f1 then f1 fo, alpha pulse is added then beta pulse is added to lower the frequency to f3 and controlled to add beta pulse in the direction to increase the frequency. Consequently it is prestored in a memory including a logic circuit for deciding whether the correction pulse beta is required or not, then it is read out to control a pulse motor 12 thus to correct the error of the frequency recovery resulting in the highly accurate presetting. |
