| 摘要 |
PURPOSE:To automate phase matching notch control, by a method wherein an actually used 0.2f-pulse is selected in a Decca main station apparatus and the phase difference pulse amplitude with all 0.2f-pulses is counted by a high frequency signal to judge phase difference. CONSTITUTION:The controllers 9-1-9-3 of a signal generating part 9 are selected through an actually used 0.2f-pulse selecting circuit 21 responding to a change-over apparatus selecting part 27 and an actually used 0.2f-pulse is selectively outputted. This pulse is compared with the 0.2f-pulses from the controllers 9-1-9-3 through a compared pulse selecting circuit 22 and a phase difference detecting circuit 23 outputs a phase difference pulse. In this case, phase difference pulse amplitude is counted by a base-24 system counter 24 for counting a 24f- signal with high frequency while phase difference is judged by the comparison with the set value of a region judging circuit 25 and the controllers 9-1-9-3 are controlled corresponding to judge output to automatically perform phase matching notch control. |
