[time-nuts] Thunderbolt Rollover Testing

2017-03-06 Thread Mark Sims
Plus Trimble's usage is rather misleading... you can do true overdetermined clock in either a static or moving environment... it properly requires more sats to be tracked than necessary to determine the time. Position hold mode (and Trimble's overdetermined clock mode) requires a fixed locati

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-06 Thread Bob Camp
Hi > On Mar 6, 2017, at 1:38 AM, Mark Sims wrote: > > Does it have a saved/surveyed position? With a saved position you can > reasonable time performance with 1 sat. Without a saved position all bets > are off, there is no way for the receiver to determine the > receiver/satellite clock d

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-05 Thread Trevor N .
On Mon, 6 Mar 2017 00:38:35 +, you wrote: >Does it have a saved/surveyed position? With a saved position you can >reasonable time performance with 1 sat. Without a saved position all bets >are off, there is no way for the receiver to determine the receiver/satellite >clock difference. >

[time-nuts] Thunderbolt Rollover Testing

2017-03-05 Thread Mark Sims
Does it have a saved/surveyed position? With a saved position you can reasonable time performance with 1 sat. Without a saved position all bets are off, there is no way for the receiver to determine the receiver/satellite clock difference. Trimble reports that the device is in "over-determi

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-05 Thread Trevor N .
On Sun, 5 Mar 2017 18:35:25 +0100, you wrote: >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. I want to eventually characterize

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-05 Thread Bob Camp
Hi > On Mar 5, 2017, at 6:31 AM, Trevor N. 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

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-04 Thread Trevor N .
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/091

Re: [time-nuts] Thunderbolt Rollover Testing

2017-03-04 Thread Tom Van Baak
> I didn't see any reports of anyone (successfully) implementing a test for it. ... > I obtained all of the receivers the driver currently supports, along with a > Spirent GSS6100 simulator. ... Hi Trevor, Matthias Jelen did a test on the Trimble Thunderbolt here: https://www.febo.com/pipermail