Hi In this case, it's an itty bitty gizmo that has some significant compromises in performance compared to it's bigger cousins.
Bob On Jan 18, 2011, at 5:47 PM, William H. Fite wrote: > Oh gosh, it would never, EVER do to find a li'l bitty product that performs > as well as our big ole spare rooms full of costly, bulky, heavy, mostly > antiquated equipment. [?] > > > > On Tue, Jan 18, 2011 at 5:10 PM, Bob Camp <[email protected]> wrote: > >> Hi >> >> Simply having cesium in it does not make it a primary standard. Since it's >> more like a rubidium than anything else, it's a lot easier to think of it >> as >> a "really small low power rubidium". One other advantage it may have is >> that >> the LED may have a longer life than a normal "light bulb" source. I suspect >> it's a little early to forecast 20 year (or not) life on these yet. >> >> Bob >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of WB6BNQ >> Sent: Tuesday, January 18, 2011 5:03 PM >> To: Discussion of precise time and frequency measurement >> Subject: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit >> >> To the list, >> >> If you listen carefully to the Symmetricom slide show, particularly page 3, >> it will tell you all you need to >> know: >> >> >> http://www.brainshark.com/Steve_FatSymmetricom/vu?pi=691826191&dm=5&pause=1&; >> appKey=77<http://www.brainshark.com/Steve_FatSymmetricom/vu?pi=691826191&dm=5&pause=1&%0AappKey=77> >> >> You will discover that that it is indeed a Cesium operated device. HOWEVER >> ! It is operated in the same manner >> as a Rubidium device. Doing such does NOT make it a primary standard. >> >> In a Cesium Primary standard, a beam of Cesium atoms are energized to a >> higher state whose decay give off a >> photon of light such that being on frequecy produces more light to the >> detector. In the Rb system, the Rb cell >> acts simply as a light filter such that when on frequency the light level >> is >> reduced as seen by the detector. >> >> This Symmetricom CSAC device uses the same process as the Rb method above. >> It uses a laser to push light through >> a chamber of Cesium gas. This Cesium gas is acting as a simple light >> filter. So in its current state it will >> not rival it superior cousins except in size and power comsumption and >> possibly price for performance in some >> applications. >> >> Bill....WB6BNQ >> >> >> >> _______________________________________________ >> 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. >> >> >> _______________________________________________ >> 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. >> > _______________________________________________ > 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. _______________________________________________ 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.
