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

Richard H McCorkle mccorkle at ptialaska.net
Thu Aug 23 18:28:17 EDT 2012


See the chart TVB produced to see the PRS10 hump in published data.
http://www.leapsecond.com/museum/prs10/

> 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
>> >>>
>> >>> _______________________________________________
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>> >>>
>> >>>
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