RADIO COMMUNICATION DEVICE

PURPOSE:To reduce the number of transmission power amplifiers and to use them efficiently in plural systems without deterioration of transmission quality in spite of phasing by composing outputs from automatic gain amplifiers of the systems and amplifying the composed output by a common transmission power amplifier to transmit the amplified signal. CONSTITUTION:Output signals from transmission mixers 3 of respective systems are composed by a direct signal composer 6 and then the composed signal is amplified by the common transmission power amplifier 5' and transmitted. In the receiving side, the received signal is distributed by the ordinary method and distributed signals are amplified up to a prescribed level by reception automatic gain controlling amplifiers 13 respectively and outputted from IF signal output terminals 15. The outputs of the receiving mixers 11 are detected by receiving power detectors 14, returned to the transmission side from a receiving power detecting signal transmitting part 16 and inputted to comparators 18 of respective systems. The comparators 18 control the gain of transmission automatic gain amplifiers 2 in respective systems. The deterioration of transmission quarity based upon the reduction of receiving power due to phasing is prevented by the transmission automatic gain amplifiers 2 and common use of the transmission power amplifier 5' improves the efficiency of the titled device.