A radiation imaging system is equipped with a radiation imaging apparatus and a control apparatus. The radiation imaging apparatus reads out image signals from a radiation detecting section that detects radiation which has passed through a subject, and outputs the read out image signals as wireless signals. The control apparatus outputs predetermined control signals to the radiation imaging apparatus as wireless signals. A second wireless communicating section of the control apparatus decreases the signal strength of communications to be lower during readout of the image signals than at times other than during readout of image signals.