in a power supply system for use in a radio communication system comprising a base station for transmitting and receiving radio signals , one or more repeater stations for repeating the radio signals , and a terminal station communicating with the base station through the repeating stations , the base station comprises means for transmitting synchronizing signal pulses at a predetermined period for effecting a battery saving type power supply . each of the repeater station and terminal station comprises means , responsive to successive reception of a predetermined number of the synchronizing signal pulses , for effecting intermittent battery saving at a period substantially equal to the period of the synchronizing signal pulses during occurrence of the synchronizing signal pulses .