Attila, That diagram looks outdated to me, by 20 to 40 years.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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
