[time-nuts] Is this a cesium frequency standard?

Bill Dailey docdailey at gmail.com
Thu Aug 23 12:37:56 EDT 2012


published and experimental data as compared to 5065a.  Large hump with max
at 2 minutes.. perplexing to me because it seems perfect in about every
other way.

On Thu, Aug 23, 2012 at 11:35 AM, Azelio Boriani
<azelio.boriani at screen.it>wrote:

> Have you observed the hump yourself or is it published data? If you made
> the measure, what reference clock did you use? I have (at work, in another
> department) a new PRS10, hope to get it back...
>
> On Thu, Aug 23, 2012 at 6:00 PM, Bill Dailey <docdailey at gmail.com> wrote:
>
> > .... The PRS10 by SRS has serious shortcomings at short tau.  I don't
> > understand why but there is a huge hump in the adev.  That's why I
> avoided
> > one.
> >
> > Sent from my iPhone
> >
> > On Aug 23, 2012, at 10:42 AM, paul swed <paulswedb at gmail.com> wrote:
> >
> > > OK have been staying clear of the replies.
> > > Thats a lot of money for a RB of who knows what age and no support.
> > > Those are $25 value items you are taking all of the risks. And yes
> indeed
> > > you can get RBs for $25 a bit low in the lamp life. But do rejuvenate
> > > nicely. FRS class.
> > >
> > > Brand new ones I think from SRS are that cost, consume a fraction of
> the
> > > power, great documentation, warranty, and modern control interfaces.
> > > What on earth would shipping and customs be??
> > > Cute boat anchor though a real waste of anything.
> > > Regards
> > > Paul
> > > WB8TSL
> > >
> > > On Thu, Aug 23, 2012 at 11:32 AM, Michael Perrett <mkperrett at gmail.com
> > >wrote:
> > >
> > >> I have found Google translate does a pretty good job on translating
> > manuals
> > >> - and it is free
> > >> Michael
> > >>
> > >> On Thu, Aug 23, 2012 at 6:40 AM, Richard Parrish <calcntr at swbell.net>
> > >> wrote:
> > >>
> > >>> The seller of the 'Russian' equipment said that the CCHB-74 frequency
> > >>> standard is a rubidium unit.  Manual is in Russian but he can
> translate
> > >>> part
> > >>> of the manual into English for an additional fee.
> > >>>
> > >>> Thanks,
> > >>> Richard Parrish
> > >>> Cal Center Inc
> > >>> 1622 Griffith Ave
> > >>> Terrell, Texas 75160-4905
> > >>> calcntr at swbell.net
> > >>> 214-577-3515
> > >>>
> > >>> -----Original Message-----
> > >>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> > On
> > >>> Behalf Of David Kirkby
> > >>> Sent: Thursday, August 23, 2012 3:18 AM
> > >>> To: Discussion of precise time and frequency measurement
> > >>> Subject: [time-nuts] Is this a cesium frequency standard?
> > >>>
> > >>> There's a seller on ebay by the name of
> > >>> "electro-radio-device-high-precision", which have some odd things.
> > >>> Some seem as if they would be 19th century items, but are sold as
> > "new".
> > >>>
> > >>>
> > >>>
> > >>
> >
> http://stores.ebay.co.uk/electro-radio-device-high-precision?_trksid=p4340.l
> > >>> 2563
> > >>>
> > >>> I suspect his stuff was desgned for the Russian military. Everything
> he
> > >>> sells is described as
> > >>>
> > >>> "analog of Lutron, Advantest, Avtech, HP Agilent, NoiseCom, General
> > >> Radio,
> > >>> Boonton, Anritsu, Fluke and general Electric, but  has the same or
> > better
> > >>> characteristics."
> > >>>
> > >>> I thought this one was interesting though
> > >>>
> > >>>
> > >>>
> > >>
> >
> http://www.ebay.co.uk/itm/5MHz-1MHz-100kHz-Frequency-standard-CCHB-74-an-g-A
> > >>> gilent-HP-/330758945645?pt=LH_DefaultDomain_0&hash=item4d02c4fb6d
> > >>>
> > >>> It has lots of knobs to twiddle, so it might be a cesium, though the
> > >> specs
> > >>> don't seem good enough for a cesium, with a relativa e error of
> > >>> +/- 2 x 10^-11 at shipping. That seems more like a rubidium spec.
> > >>>
> > >>> He has some bizzare stuff, like a power meter which works to 53 GHz,
> > but
> > >>> has
> > >>> banana plugs on it. I guess the sensor is connected to the banana
> > plugs,
> > >>> though he does not mention it needing an external sensor.
> > >>>
> > >>>
> > >>>
> > >>
> >
> http://www.ebay.co.uk/itm/0-03GHz-53GHz-1mkWatt-10mWatt-Power-meter-M3-22-an
> > >>>
> > >>>
> > >>
> >
> -g-Agilent-HP-Marconi-GenRad-/230821610924?pt=LH_DefaultDomain_0&hash=item35
> > >>> be0a45ac
> > >>>
> > >>> Some of his stuff seems very over priced, like a 400-1200 MHz sig gen
> > >> with
> > >>> an error of 1% for $1580, but other things seem quite reasonable.
> > >>> If you need a sig gen at 70 GHz, he has them.
> > >>>
> > >>> Anyway, its worth checking out his auctions, as he has some test
> > >> equipment
> > >>> which is very different from what one normally sees - and it some
> cases
> > >> to
> > >>> what one would want to see!
> > >>>
> > >>> Dave
> > >>>
> > >>> _______________________________________________
> > >>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
> > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > >>> and follow the instructions there.
> > >>>
> > >>>
> > >>> _______________________________________________
> > >>> time-nuts mailing list -- time-nuts at febo.com
> > >>> To unsubscribe, go to
> > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > >>> and follow the instructions there.
> > >>>
> > >> _______________________________________________
> > >> time-nuts mailing list -- time-nuts at febo.com
> > >> To unsubscribe, go to
> > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > >> and follow the instructions there.
> > >>
> > > _______________________________________________
> > > time-nuts mailing list -- time-nuts at febo.com
> > > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > > and follow the instructions there.
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 
Doc

Bill Dailey
KXØO



More information about the time-nuts mailing list