| 1. | The transmitters use a primary frequency standard to derive the frequencies used.
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| 2. | Another important thing for a frequency standard is low phase noise.
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| 3. | An atomic clock uses an atomic resonance frequency standard as its timekeeping element.
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| 4. | A "'frequency standard "'is a stable oscillator used for frequency calibration or reference.
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| 5. | The official time signal is given by the Time and Frequency Standards Laboratory.
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| 6. | But the really accurate atomic clocks, called Primary Frequency Standard, are far fewer.
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| 7. | A simple electronic feedback loop can lock the repetition rate to a frequency standard.
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| 8. | A "'frequency comb "'allows a direct link from radio frequency standards to optical frequencies.
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| 9. | A frequency standard generates a fundamental frequency with a high degree of accuracy and precision.
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| 10. | Atomic hydrogen determines the frequency of hydrogen masers which are used as precise frequency standards.
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