| 1. | The development of a passive hydrogen maser for QZSS was abandoned in 2006.
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| 2. | Hydrogen masers are very complex devices and sell for as much as } }.
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| 3. | In the active hydrogen maser, the cavity oscillates by itself.
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| 4. | In the passive hydrogen maser, the cavity is fed from an external GHz frequency.
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| 5. | Products included hydrogen masers, telecom synchronization supply units ( SSUs ), and timing test sets.
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| 6. | Atomic hydrogen determines the frequency of hydrogen masers which are used as precise frequency standards.
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| 7. | GIOVE-B carries three atomic clocks : two rubidium standards and the first space-qualified passive hydrogen maser.
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| 8. | The long-term stability of hydrogen maser standards decreases because of changes in the cavity's properties over time.
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| 9. | Hydrogen masers ( often manufactured in Russia ) have superior short-term stability compared to other standards, but lower long-term accuracy.
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| 10. | Hydrogen masers have linewidth around 1 Hz; their coherence length approximately corresponds to the distance from the Earth to the Moon.
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