| 摘要 |
PURPOSE:To increase the accuracy of control for tuners, by transmitting pulses from the control circuit until they reach a prescribed number, based on the information of memories and a pulse motor number of revolution detecting circuit. CONSTITUTION:A pulse motor 5 controls the phase of a tuner 7 in response to a klystron tuner 7 and a control pulse. Further, a pulse motor number of revolution detecting circuit 8 receives the mechanical output of a motor 5 with gears, counts the number of revolutions and feeds back the result to a control circuit 3'. Based on the information of the memory 2 and the circuit 8, pulses are transmitted until they reach a prescribed number and the transmission of the pulses is stopped when reaching the specified number of revolutions. Thus, even if noise is mixed to electric circuits on the way of the control system, the mechanical driving system is driven by a prescribed number. Thus, the detected output is fed back to the control circuit 3', allowing to increase the control accuracy of tuner. |
