[time-nuts] GPSDO for a week

Markus Kern mkern at fastmail.fm
Fri Feb 27 23:31:24 UTC 2009

On 27.02.2009, 06:10 Tom Van Baak <tvb at LeapSecond.com> wrote:

> Here are some fresh, detailed plots of a TBolt for 8 days.
> http://www.leapsecond.com/pages/tbolt-8d/

> Perhaps this helps with recent VLBI questions.

Thanks a lot for taking the time to do these measurements Tom.

If I am interpreting the data correctly the ADEV stays below
3E-(8+tau) out to tau=1000s and is above that for tau=10000s. So the
Thunderbold is indeed not suitable for VLBI at 40-50MHz with
integration times longer than 1000s.

> Note the plots above are against a local standard and should
> not be confused with plots people are making through TSIP or
> TboltMon or LH, which are essentially just a TBolt comparing
> against itself. If this doesn't make sense I can explain more.

> /tvb

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