[time-nuts] time-nuts Digest, Vol 102, Issue 89

[Scott McGrath]

Don't forget the ion fountain to check the H Maser :-)

Sent from my iPhone

On Jan 23, 2013, at 5:35 PM, "J. L. Trantham" <jltran at att.net> wrote:

> Russ,
> 
> You might want to consider stopping to think about it now.  Otherwise,
> you'll wind up with a Cesium Standard to check the GPSDO, a collection of
> OCXO's and Rb's to see which is the best, not to mention all the test
> equipment needed to carry out those measurements, and, perhaps, a MASER to
> check the CS.
> 
> Having done what you are contemplating, I vote for the GPSDO and a TBolt is
> a great choice.  I would recommend a linear power source rather than a
> 'switching' power supply.  Otherwise, get a switching power supply with
> higher voltages than needed and use some linear regulators downstream to
> generate the +12, -12, and +5 needed for the TBolt.
> 
> Good luck.
> 
> Joe
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Russ Ramirez
> Sent: Wednesday, January 23, 2013 2:24 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] time-nuts Digest, Vol 102, Issue 89
> 
> Hi Bob,
> 
> That's a good point and not nit picking. While my particular HP 5334A
> counter (sans 1.3 GHz channel C option) only measures with this kind of
> resolution at lower frequencies, I will be using the source for my Fluke
> 6060B (instead of the 5334A's output as I do now) which can produce a 1050
> MHz signal, and of course any future test equipment needs. So yeah, I
> suppose I'd appreciate having a 1 ppb accuracy now that I've thought about
> it. Thanks.
> 
> Russ
> 
> On Wed, Jan 23, 2013 at 1:45 PM, <time-nuts-request at febo.com> wrote:
> 
>> Message: 8
>> Date: Wed, 23 Jan 2013 14:48:36 -0500
>> From: "Bob Camp" <lists at rtty.us>
>> To: "'Discussion of precise time and frequency measurement'"
>>        <time-nuts at febo.com>
>> Subject: Re: [time-nuts] Least costly 10 MHz reference solution
>> Message-ID: <F3CC4B394995429A86320F617F42DBDB at vectron.com>
>> Content-Type: text/plain;       charset="US-ASCII"
>> 
>> Hi
>> 
>> Not to pick nits, but 7 decimal places at what input frequency? Seven 
>> places is 10 ppb at 10 MHz. If the input was 100 MHz, it would be 1 
>> ppb.
>> 
>> The distinction is significant, since it crosses a boundary.  At 10 
>> ppb a free running Rb is fine with no adjustments. At 1 ppb, some 
>> adjustment might be needed.
>> 
>> You might also want a standard that's 5X better than the expected result.
>> That would get you into the 2 to 0.2 ppb range.
>> 
>> Lots of fiddly little details...
>> 
>> Bob
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