Radio transmission device, the standing wave ratio measuring device and the standing wave ratio measuring method

摘要

radio transmission apparatus, the transmission signal generating apparatus comprises a detection circuit and a standing wave ratio measuring circuit. Detection circuit detects a detection voltage of the traveling wave corresponding to the transmitted signal, the detection voltage of the reflected wave. The standing wave ratio measuring circuit measures the voltage standing wave ratio based on the detected voltage and the detection voltage of the reflected waves of the traveling wave. Detection circuit includes a detection unit and the time constant circuit. Detector detects the detection voltage of said traveling wave and the detected voltage of the reflected wave. Time constant circuit averages the detected voltage of the traveling wave detected, the temporal variation for each of the detected voltage of the reflected wave by the detecting unit. Here, in the time constant circuit, wherein in a state in which the transmission signal rises time constant is set shorter as compared to the state falls the transmission signal.