| 摘要 |
PURPOSE:To exactly execute a response operaton of a beacon, and also to make PPI display uniform and easily visible, by constituting a titled device so that it is reset to main and sub-sweep frequency schedules when sweep of receiving frequency is stopped, and a pulse is received for a specified period. CONSTITUTION:When sub-sweep crosses beacon receiving band width and the first radar pulse is received, a sweep level holding part 11 detects it through a continuous wave detecting part 12, temporarily cuts the connection with a sweep generating part 10, and holds a sweep level. Oscillation frequency of a local oscillator 8 is held. When the continuous wave detecting part 12 detects that the radar pulse is received continuously at prescribed intervals, the sweep level holding part 11 releases its holding and is connected with the sweep generating part 10. |
