Hi Using this directly at microwave - not a real good idea. Using it to drive a 100 MHz phase locked low noise VCXO through a very narrow loop and then taking that on up to microwave - should work pretty well. The only gotcha would be if they are into PSK-32 at 24 GHz and don't like to tune around. Then indeed the GPSDO might do a bit better.
The degree of advantage will depend on just how much power they are already hauling along. If the rest of the gear runs a hundred watts, then there's no significant savings over the alternatives. If they have everything else down to under ten watts, then indeed there will be a real advantage to the low power / small size. Bob On Jan 18, 2011, at 7:43 PM, Tom Holmes wrote: > OK, so aside from the price of this toy, are there any performance reasons > why this itty bitty gizmo wouldn't be quite useful to my ham friends who do > portable/mobile microwave operation, as opposed to dragging along a GPSDO or > OCXO? Think in terms of frequency error at 10 GHz, 24 GHz or even higher. > > Tom Holmes, N8ZM > Tipp City, OH > EM79 > > >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Bob Camp >> Sent: Tuesday, January 18, 2011 5:55 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit >> >> 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&pau >> se=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. > > > > _______________________________________________ > 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.
