[time-nuts] Symmetricom CSAC is Cs acting like a Rb unit

[Tom Holmes]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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 <lists at rtty.us> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
> >>
> >>
> >>
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> >>
> >>
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