| 摘要 |
PURPOSE:To eliminate an unnecessary transmission output and to facilitate emergency interruption operation from a subordinate station by controlling a local transmission output by comparing a received electric field with a reference level at a master and subordinate station communication system, and by sending the information to a party station. CONSTITUTION:When a subordinate station B or C receives a radio wave from a party station, the detection information of an electric-field level detector 10 is sent to the transmission output control circuit 6 of the station, the transmission output of a power amplifier 5 is set to an S/N securing input level, and the detection information is supplied to a modulator 11 to be transmitted to the party station. This party station sends this information from a demodulator 12 to a circuit 6, and lower a transmission output so that the received electric field level of the station is equal to the S/N securing input level. As a result, the transmission outputs of both the stations are minimized. In this state, when the other subordinate station has an emergency communication with a master station A, an interruption signal 13 is sent to a circuit 6 to maximize the transmission output of the subordinate station, and a D/U is increased to facilitate interruption. |
