| 摘要 |
PURPOSE:To identify it system abnormal oscillation when at least one reception input is excessive resulting in saturating a transmission output and suppressing the amplification factor and to immediately restore a relay amplification gain when the excess input of the said one wave is released in the ratio repeater receiving a radio wave from a mobile radio equipment, relaying and amplifying the received radio wave and re-transmitting the result. CONSTITUTION:A variable attenuator 12 varying the relay amplification gain is provided in front of a relay amplifier, a coupler 14 provided to a transmission output terminal detects a transmission output, the detection level is detected by a level detector 15 driving the level in two steps and the result is given to a control section 16. Thus, whether an excess input abnormality or abnormal oscillation is identified, and when the abnormality of the excess input is released, the attenuation of the variable attenuator 12 is immediately restored to the initial value. |
