Re: [time-nuts] Thunderbolt rollover glitch

2017-07-30 Thread Pete Stephenson
On Sun, Jul 30, 2017, at 04:49 AM, Mark Sims wrote: > It looks like it took three hours for the effects of the rollover glitch > to mostly settle out. > > BTW, if you only use Lady Heather with a Thunderbolt, you can force the > rollover state from the command line or heather.cfg file by using

[time-nuts] Thunderbolt rollover glitch

2017-07-29 Thread Mark Sims
It looks like it took three hours for the effects of the rollover glitch to mostly settle out. BTW, if you only use Lady Heather with a Thunderbolt, you can force the rollover state from the command line or heather.cfg file by using the /ro command line option. If you do that you won't have

[time-nuts] Thunderbolt rollover glitch

2017-07-29 Thread Mark Sims
Attached is a plot of Thunderbolt data before and after the event. 2 seconds after rollover the Thunderbolt reported it was re-initializing the loop filter and 4 seconds after the event it reported is was starting to phase lock the 1PPS. The DAC jumped 0.023V V which is around 75 mHz of

[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

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 >

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

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 >>

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

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:

Re: [time-nuts] Thunderbolt Rollover

2014-09-18 Thread Tom Van Baak
Brooke, FYI: the prior art for that Trimble patent is: http://leapsecond.com/notes/gpswnro.htm /tvb Hi Matthias: Trimble thought they had come up with a way to account for GPS week rollover, but the Earth has not cooperated. See: Leap-second cure for 1999 GPS rollover problem

Re: [time-nuts] Thunderbolt Rollover

2014-09-17 Thread Tom Van Baak
)*7168, or 50796 + N*7168. See also the gpsweek tool under http://leapsecond.com/tools/ Sample usage: gpsweek 1980 2100 | grep rollover /tvb - Original Message - From: Mark Sims hol...@hotmail.com To: time-nuts@febo.com Sent: Tuesday, September 16, 2014 1:41 PM Subject: [time-nuts

Re: [time-nuts] Thunderbolt Rollover

2014-09-17 Thread Tom Van Baak
confirmation. Thanks, /tvb - Original Message - From: Matthias Jelen matthias.je...@gmx.de To: Tom Van Baak t...@leapsecond.com; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, September 16, 2014 1:52 PM Subject: Re: [time-nuts] Thunderbolt Rollover Hi Tom

Re: [time-nuts] Thunderbolt Rollover

2014-09-17 Thread Hal Murray
I don't think you can use a GPS almanac from 2012. Why not? Just pretend that the time you want is 2012+1024 weeks. You won't be able to watch it pass through the magic rollover time, but you can verify that it works correctly once it gets past that magic time. Crazy question

Re: [time-nuts] Thunderbolt Rollover

2014-09-17 Thread Brooke Clarke
Hi Matthias: Trimble thought they had come up with a way to account for GPS week rollover, but the Earth has not cooperated. See: Leap-second cure for 1999 GPS rollover problem https://www.google.com/patents/US5923618 Do you know anything about the Northern Telecom GPS Satellite Simulator

[time-nuts] Thunderbolt Rollover

2014-09-16 Thread Matthias Jelen
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[time-nuts] Thunderbolt Rollover

2014-09-16 Thread Matthias Jelen
Hello, I got a Trimble Thunderbolt a few months ago and implemented a simple monitor on a MCU to display time, no of satellites etc. on a lcd display. While working on this, I found the hint for the upcoming rollover in 2017 in the user manual. I couldn?t find any details on this in the

Re: [time-nuts] Thunderbolt Rollover

2014-09-16 Thread Tom Van Baak
into the timestamps for dates after July 2017. /tvb - Original Message - From: Matthias Jelen matthias.je...@gmx.de To: time-nuts@febo.com Sent: Tuesday, September 16, 2014 12:06 PM Subject: [time-nuts] Thunderbolt Rollover Hello, I got a Trimble Thunderbolt a few months ago and implemented

[time-nuts] Thunderbolt Rollover

2014-09-16 Thread Mark Sims
Version 4 of Lady Heather(not yet released) has rollover compensation built in. If the detected date is less than the current system date it adds 1024 weeks to the Tbolt date/time by default. You can also specify an alternate rollover offset or disable rollover compensation.

Re: [time-nuts] Thunderbolt Rollover

2014-09-16 Thread Hal Murray
matthias.je...@gmx.de said: So I took the unit to work and hooked it to a signal generator capable of simulating GPS, GNSS etc... Neat. Thanks, both for running the experiment and for sharing the results. Thunderbolt will be usable after July, 2017 - I?d be happy to live with a wrong

Re: [time-nuts] Thunderbolt Rollover

2014-09-16 Thread Matthias Jelen
, and is on the list) to add the 936 week offset back into the timestamps for dates after July 2017. /tvb - Original Message - From: Matthias Jelen matthias.je...@gmx.de To: time-nuts@febo.com Sent: Tuesday, September 16, 2014 12:06 PM Subject: [time-nuts] Thunderbolt Rollover Hello, I