In a radio control system of the digital proportional control type in which a control signal whose period comprises a plurality of control pulses and a timing pulse is transmitted to control servomechanisms in response to the time width of each control pulse, the carrier wave exists only for the time between the trailing end of each control pulse and the leading end of the next control pulse, for the time between the trailing end of the timing pulse and the leading end of the first control pulse, and for the time between the leading end of the timing pulse and the trailing end of the last control pulse, in order to minimize consumption of the supply battery.
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