PURPOSE:To prevent radio interference by connecting and transmitting the station operating condition information of the master radio equipment in the respective channels of respective repeating stations to the central control equipment of a control station with the data line of a multiple radio line. CONSTITUTION:When a maintainer causes the master radio device of the arbitrary channel to be a test condition out of master radio equipment 4 of a repeater stations A, channel test information 7 are transmitted to a central control equipment 1 by data lines 5. In the central control equipment 1, from frequency arranging information to be set in advance, the master radio equipment 4 of the other repeater station, whose frequency is same as the master radio station during the test of the repeater station A, is selected and channel blocking information 8 are transmitted to a repeater station B and the other said repeater station by the data line 5. The said master radio equipment 4 to receive the channel blocking information prohibits transmission activation until these information are canceled. Thus, the radio interference of a sharing wave can be automatically avoided at the time of maintenance.
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