Abstract
One of the directions of modernization of the caesium atomic clocks is considered. A new implementation of a digital frequency converter for atomic clocks is presented. The new design of frequency converter is based on method of direct digital synthesis. The theoretical calculations and experimental research showed decrease step frequency tuning by several orders and improvement the spectral characteristics of the output signal of frequency converter. A range of generated output frequencies is expanded, and the possibility of detuning the frequency of the neighboring resonance of spectral line that makes it possible to adjust the C-field in quantum frequency standard is implemented. Experimental research of the metrological characteristics of the quantum frequency standard on the atoms of caesium - 133 with a new functional unit showed an improvement in the daily frequency stability.
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