| 摘要 |
PURPOSE:To simplify a structure and also to reduce a cost by using a directional coupler so as to extract part of an output signal of a transmitter, converting it into a test reception signal and using a directional coupler so as to input the result to a receiver. CONSTITUTION:The output signal of the transmitter 1 is sent to an antenna 3 via a multicoupler 11 and a part of it is extracted by a direction coupler 5 being a 1st means and fed to an intra-office loopback test equipment 6. Furthermore, a signal converted into a test reception signal by the intra-office loopback test equipment 6 is given to a receiver 8 via a directional coupler 10 being a 3rd means. Since no component requiring rainfall-preventing measures is employed especially, the structure is simplified and the cost is reduced. |
