[time-nuts] STEL-1173/CM Source

Ed Palmer ed_palmer at sasktel.net
Thu Dec 18 15:59:24 EST 2014

On 12/18/2014 11:00 AM, Magnus Danielson wrote:

> Ed, On 11/15/2014 04:38 PM, Ed Palmer wrote:
>> Yes, I'm sure. I did check the cabling. If I was somehow measuring the Tbolt or 4065A against itself, there wouldn't be any frequency offset. The Oscilloquartz 3210 (which appears to be an OEM'd 4065A) is spec'ed at 3E-13 @ 100K seconds. The 4065C is even better at 8.5E-14 with a noise floor of 5E-14.
> My OSA 3210 is not the same core as 4065A.

Looks like I had a dyslexic moment!  It turns out that Oscilloquartz 
produced both  3120 and 3210 Cesium standards.  No confusion there!

The 3120 appears to be an OEM'd 4065A or, to be specific, the core 
module is.  The core is then wrapped with an Oscilloquartz power supply, 
buffers, communications and monitoring system.  The 4065A appears to be 
the same core with a Datum/FTS wrapper.

>> My data run is continuing. The end of the graph is flopping around as usual, but it's now showing Total Deviation of about 1.4E-13 @ 100K seconds with a total of 226 800 readings at 1 second intervals. Frequency offset error is still 6E-13. Autocorrelation of the results shows diurnal spikes at approximately 86 160 and 172 310 seconds (i.e. one and two sidereal days).
> Most likely thermal sensitivity.
> Got myself some STEL 1173 in PLCC 44 from that source. Thanks for
> sharing link!

You're welcome.  Glad I could help.


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