VCH-2021 is the first successful realization of hydrogen maser with a single state selection system. It demonstrates absolutely record frequency stability for active H-masers.
Best technologies including internal stand-alone Cavity Auto Tuning system are inherited from the previous model VCH-1003M.… ► “Active Hydrogen Maser VCH-2021”

The VCH-1003M is a high-performance hydrogen maser with low phase noise output signals. Extremely high frequency stability is provided by state-of-the-art technology and internal stand-alone Cavity Auto Tuning system.

Key Applications
– National Time Keeping Service;
– Deep space tracking … ► “Active Hydrogen Maser VCH-1003M”