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. >
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