[time-nuts] Thunderbolt Rollover Testing

Bob Camp kb8tq at n1k.org
Sun Mar 5 12:35:25 EST 2017


> On Mar 5, 2017, at 6:31 AM, Trevor N. <qb4 at comcast.net> wrote:
> On Sat, 4 Mar 2017 20:39:45 -0800, you wrote:
> ....
>> Matthias Jelen did a test on the Trimble Thunderbolt here:
>> https://www.febo.com/pipermail/time-nuts/2014-September/086664.html
>> https://www.febo.com/pipermail/time-nuts/2015-May/091805.html
>> https://www.febo.com/pipermail/time-nuts/2015-May/091825.html
> ....
> Thanks for the links, I didn't see the 2015 test.  Currently the older
> Spirent simulators are going for very resonable prices on the 'bay.
> The GSS4100 can be had for under $200 and 6100s frequently pop up for
> $150.

One thing a 6100 will let you do is to calibrate the PPS out of your “gizmo” to +/- 5 ns (one sigma). While it’s 
not an impressive number by TimeNuts standards, it is one of the few ways to get that job done. 

>  Anything newer is still very expensive, though. It may be
> necessary to use a multichannel simulator for newer receivers (or
> multiple synchronized single channel units), as I haven't yet been
> able to get the Trimble Resolution boards to go into overdetermined
> mode with a single simulated SV.

It would be a bit alarming if you *could* get it to show overdetermined with only a single clock source :)


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