[time-nuts] Question for the cesium nuts.
Tom Van Baak
tvb at leapsecond.com
Sat Mar 17 10:09:37 EDT 2007
> > What do "active" and "passive" mean wrt masers?
> > From the above data sheets, active means bigger and better. (and probably
> > more expensive)
> Active masers oscillate.
> Passive masers don't.
Another way to think about it:
active masers oscillate;
passive masers resonate.
Note the rubidium vapor and cesium beam atomic frequency
standards that many of us use are also of the passive type;
i.e., they lock a quartz LO by rapid probing of the resonance
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