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

[J. L. Trantham]

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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