| 摘要 |
PURPOSE:To prevent bypass of transmission/reception between relay stations by providing a common control line to each relay station and applying simultaneous switching control to other remaining stations in receiving a radio wave of one station and retransmitting it by one relay station. CONSTITUTION:Repeaters 1-3 are connected mutually by a control line 4 and the transmission state and the reception state are subject to simultaneous switching control. A radio wave from a radio station A1 is received by a repeater 1, a voltage is fed to the control line 4 at the next point of time to bring the repeaters 1-3 into the transmission state at the same time to send the signal from the antenna of each repeater. The radio wave is received by radio stations B1, B2. Thus, the radio wave of one station is received by a common line 4 and sent again, then the other repeater is switched simultaneously into the transmission state to stop the reception state and the bypassing, repeating endlessly, the transmission/reception of the radio wave is prevented among the repeaters 1-3. Moreover, the signal is sent simultaneously among the repeaters 1-3 to send the signal simultaneously over a wide range.
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