| 摘要 |
PURPOSE:To effectively control the plane of polarization of an antenna by pushing either of switches for switching the plane of polarization, outputting data controlling it to an angle of horizontal and vertical plane of plarization from a microcomputer, D/A converting it to drive a pulse motor and rotating the antenna. CONSTITUTION:When either of switches 14 and 15 is pushed, the data which controls the antenna to the angle of horizontal or vertical plane of polarization is outputted from a microcomputer 13 and inputted in the register 18 of a D/A converter 17. Meanwhile in an oscillation circuit 19, for instance, 455 kHz signal is oscillated and transmitted to a counter 20. Then by means of a coincidence circuit 21, the pulse width is controlled as a low-frequency pulse which is in a necessary period to control a pulse motor with the data in the register 18 and outputted, transmitted to the pulse motor through a pulse output circuit 25 to control the antenna to the angle of horizontal or vertical plane of polarization.
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