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

Bill Dailey docdailey at gmail.com
Thu Aug 23 12:00:39 EDT 2012


.... 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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