Abstract: In a transmission level control system in a radio communication station where an in-station apparatus is connected with an antenna site through a transmission line, the in-station apparatus includes a plurality of burst carrier transmitters, and the antenna site comprises a level controller for controlling the carrier level so as to compensate the received carriers for level reduction stemming from the transmission line. The in-station apparatus comprises a carrier combiner for combining the transmitted burst carriers to transmit them to the antenna site through the transmission line, a selector for selecting one of the burst carrier transmitters, and a controller for activating the level control operation of the level controller only when only the burst carrier transmitter selected by the selector outputs the transmitted carrier, otherwise inhibiting.