| 摘要 |
PURPOSE:To prevent the overshoot of a frame stand or the like by using a servo filter amplifier, when a signal input reaches a linear region of a control circuit, in a system controlling a drive system of the antenna frame stand. CONSTITUTION:When an angular error signal having a saturation region level of a control circuit is given to an input terminal 1, the frame stand starts rotation and reaches comparatively quickly a prescribed speed corresponding to a gain R3/R1 obtained at a DC amplifier where a capacitor C is shortcircuited with a contact a1, and the rotation continues at the speed. When the frame stand closes to an objective position and the input signal level reaches the linear region of the control circuit, a linear region detecting circuit 5 outputs a linear region detecting signal, a relay A is operated to open the contact a1, and the short-circuit of the capacitor C is released, then the control circuit starts operating as the servo filter amplifier, and the drive of the frame stand is converged into the objective position. |
