[time-nuts] Thunderbolt accuracy...??
XDE-L2G3 at myamail.com
Sat Dec 20 22:08:47 UTC 2008
>> I just wanted to ask the group if the Thunderbolt would be more
>> accurate than the internal reference? I want to think it is but
>> my link to the thunderbolt spec sheet is no longer valid.
> Some time ago, I took my T-bolt over to the Metrology and
> Standards Lab at the University of Florida and set it up to run
> overnight and let it do its full survey process.
> In spite of the fact that the antenna was in a rather poor
> location it locked up quickly and seemed to run flawlessly.
> The monitoring was only intended to look at the frequency accuracy
> of the 10 MHz output - other timing characteristics so dear to
> Time-Nuts hearts were ignored.
> After its overnight warm-up and survey process was done, we found
> (over a period of 48 hours) that the 10MHz output was never worse
> than 1.0 X E-12 and was generally better than that by a
> considerable margin about 90% of the time.
> Mike Baker
> Gainesville, FL
Mike, thanks for the info. These real-world data points are very
valuable. I have some questions:
What frequency reference did they use at the university standards
lab to measure the T-Bolt frequency? And how did they measure its
How did they do the comparison to your TBolt? If it was a counter,
what kind was it?
You mentioned the error was better than 1e-12 90% of the time. What
was the average error?
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