| 摘要 |
PURPOSE:To secure the certainty of called-state decision operation by holding a reception level constant by sending an intercept command signal by using the free time of control signal transmission without overlapping with a control signal. CONSTITUTION:Control signals f1-fn corresponding to subordinate stations 2-1- 2-n are generated by control signal oscillator OSC1 of master station 1 and are sent to subordinate stations 2-1-2-n via hybrid HYB1. Then, called-state decision parts BPF1-BPFn of subordinate stations 2-1-2-n allow selectively control signals to pass through. On detecting a control signal for its own station, fixed operation, e.g., control measurement is taken to send a return signal out. Further, intercept command oscillator OSC2 is oscillated in the free time of control signal transmission by controlling intercept command transmitting contact 4 by control-signal oscillator OSC1 to send an intercept command signal to intercepting station 3. This intercept command signal allows the intercepting station to receive the return signal to the subordinate station at that time. |
