Annotation: This paper proposes an astatic frequency-locked loop with the improved noise immunity and dynamic accuracy compared with the static frequency-locked loop. Improved noise immunity has been achieved through radiopulse spectrum conversion of an input harmonic signal. It allows reducing the self-tuning band of the narrow-band voltage-controlled oscillator follow-up filter, implemented on the basis of the developed frequency-locked loop, by several orders of magnitude. Simple analytic expressions for estimating the improvement of noise immunity and dynamic accuracy of the developed system are given allowing to compare it with the static frequency-locked loop of the voltage-controlled oscillator. An implementation of the harmonic signal spectrum radio pulse converter on the basis of present hardware components is proposed.