[time-nuts] active vs passive hydrogen maser long term stability

Tom Van Baak tvb at LeapSecond.com
Mon Dec 9 12:30:56 UTC 2013


Attila,

That diagram looks outdated to me, by 20 to 40 years. See modern plots in:

http://tycho.usno.navy.mil/ptti/2004papers/paper38.pdf
The Long-Term Stability of the U.S. Naval Observatory's Masers

http://www.ptfinc.com/dsheets/CH1_75A.pdf
CH1-75 Active Hydrogen Maser

http://www.ptfinc.com/dsheets/CH1_76A.pdf
CH1-76 Passive Hydrogen Maser

http://www.oscilloquartz.com/files/1383126805-da_3700.pdf
OSA 3700 Passive Hydrogen Maser

http://www.symmetricom.com/resources/download-library/documents/datasheets/mhm-2010/
Symmetricom (Sigma Tau) MHM 2010, Active Hydrogen Maser

See also:

http://www.spectratime.com/documents/EPTF2010_Paper_SHM.pdf
2010, Development of the space active hydrogen maser for the ACES mission

http://hal.archives-ouvertes.fr/docs/00/22/17/13/PDF/ajp-jphyscol198142C818.pdf
1981, Hydrogen Maser: Active or Passive?

Note also these days most active masers have cavity auto-tuning.

/tvb





More information about the Time-nuts_lists.febo.com mailing list