Re: [time-nuts] GPS week rollover

Hi Jeff, On 6/04/2019 3:30 pm, Jeff Zambory wrote: Yes Steve, you are correct. https://www.gps.gov/ Scroll down a bit and you can find a count down to the roll over. And it states the time when it will roll over. Just what you have said. Thanks !!! I'll watch that and watch my receivers.

Re: [time-nuts] GPS week rollover

> Le 6 avr. 2019 à 17:53, jimlux a écrit : > > On 4/6/19 12:53 AM, Mike Cook wrote: >> The OP doesn’t state where he got the « quote » from, but IMHO it is wrong. >> As I understand it. >> The GPS epoch started at 0h 1st June 1980 > > 6 Jan 1980 00:00:00 UTC Just so… 01/06 tripped me > >

Re: [time-nuts] GPS week rollover

On 4/6/19 12:53 AM, Mike Cook wrote: The OP doesn’t state where he got the « quote » from, but IMHO it is wrong. As I understand it. The GPS epoch started at 0h 1st June 1980 6 Jan 1980 00:00:00 UTC ___ time-nuts mailing list --

Re: [time-nuts] GPS week rollover

Steve Olney wrote: > Just curious - WNRO is not an issue for me even if my GPS receivers are > affected - but I note that the time of rollover is being quoted as > 23:59:59 UTC 6th April. > > Wouldn't the time actually be 18 seconds earlier ? - i.e., 23:59:42 - > due to leap seconds ? > > BTW -

Re: [time-nuts] GPS week rollover

Hi Martin, On 6/04/2019 6:44 pm, Martin Burnicki wrote: Steve Olney wrote: Wouldn't the time actually be 18 seconds earlier ? - i.e., 23:59:42 - due to leap seconds ? Martin Burnicki wrote: so the WNRO occurs 18 s before UTC midnight. So - yes. Thanks for the clarification. Cheers

Re: [time-nuts] GPS week rollover

The OP doesn’t state where he got the « quote » from, but IMHO it is wrong. As I understand it. The GPS epoch started at 0h 1st June 1980 and the week number roles at 1024 week intervals at 0h GPS time. When a leap second is added its as if the clock stops for a second so GPS time will be in

Re: [time-nuts] GPS week rollover

I checked my Garmin Emap, 1999 vintage IIRC. That is telling me that it is 20/05/2014. I found this for Trimble which shows a number of devices affected by this which are commonly used bt timenuts. Have a nice day

Re: [time-nuts] GPS week rollover

Yes Steve, you are correct. https://www.gps.gov/ Scroll down a bit and you can find a count down to the roll over. And it states the time when it will roll over. Just what you have said. Jeff Z. Sent from my iPhone > On Apr 5, 2019, at 4:40 PM, Steve Olney wrote: > > Just curious - WNRO

Re: [time-nuts] GPS week rollover

Just curious - WNRO is not an issue for me even if my GPS receivers are affected - but I note that the time of rollover is being quoted as 23:59:59 UTC 6th April. Wouldn't the time actually be 18 seconds earlier ? - i.e., 23:59:42 - due to leap seconds ? BTW - I'm not clear about GPS time

Re: [time-nuts] GPS week rollover

I received the same invitation. And they states that the WNRO problem is an "external" problem.  I did it and now all the maps are signaled as invalid! Fortunately I was able to copy my  main map from a backup copy. Regards, Ignacio EB4APL El 04/04/2019 a las 12:29, Mike Cook escribió:

Re: [time-nuts] GPS week rollover

Potentially everything using the week 10 bits. Check your manufacturer. Trimble is all over this. Sent from my iPhone > On Apr 4, 2019, at 06:29, Mike Cook wrote: > > Hi, > I just got a heads up fro TomTom, saying my Go Live 825 bought 2012 « may » > have WNRO problems after the April

Re: [time-nuts] GPS week rollover

Hi, I just got a heads up fro TomTom, saying my Go Live 825 bought 2012 « may » have WNRO problems after the April 6 rollover and invited me to update the firmware. I wouldn’t think it would affect the navigation, but it might brick the device. Unfortunately I can’t test it as it went to

Re: [time-nuts] GPS week rollover

Hi If you want it to behave like a signal generator ( variable output level) that also is another rabbit hole to run down. Since the signals are well below the noise after full spreading (and not all that strong before spreading) it takes some care to get that right. On a production basis,

Re: [time-nuts] GPS week rollover

On 3/29/19 12:22 PM, John C. Westmoreland, P.E. wrote: To All: I have a related question; hope it's OK: What are these companies using for their "GPS Simulation/Simulators?". Is it actually simulating the RF downlink or is a direct data stream injection into a tap into the receiver?? RF.

Re: [time-nuts] GPS week rollover

A multichannel, L1 GPS-only simulator/recorder costs about US5k. We have one of these that we used to test for rollover problems with some older receivers that we use (none found). The software with this lower cost device is not very sophisticated. As Bob hints though, a top of the line simulator

Re: [time-nuts] GPS week rollover

Hi Obviously the real answer is going to be “that depends”. Back when I worked for a living, we had an HP generator that would “play back” a recorded ~ 30 minute set of GPS “full sky” observations. It was strictly a playback with no real way to tweak this or that. We also had a single

Re: [time-nuts] GPS week rollover

To All: I have a related question; hope it's OK: What are these companies using for their "GPS Simulation/Simulators?". Is it actually simulating the RF downlink or is a direct data stream injection into a tap into the receiver?? Thanks In Advance, John W. On Fri, Mar 29, 2019 at 11:00 AM

Re: [time-nuts] GPS week rollover

Avidyne avionics are known to be affected by the rollover, causing the loss of some displayed data. https://www.avidyne.com/files/downloads/606-00182-019.pdf On Thu, Mar 28, 2019 at 3:04 PM Mark Sims wrote: > > I doubt that any GPS receivers will be newly affected on April 6. Some very >

Re: [time-nuts] GPS week rollover

Martin Burnicki wrote: > Gary E. Miller wrote: >> Telit has already issued an App note on this. They tested their >> GPS with a GPS simulator. One of their common models will fail on >> April 6. Two more will fail in November. >> >> Sorry, I can't find it online. > > I found an overview here: >

Re: [time-nuts] GPS week rollover

Gary E. Miller wrote: > Yo Mark! > > On Thu, 28 Mar 2019 20:38:42 + Mark Sims > wrote: > >> I doubt that any GPS receivers will be newly affected on April >> 6. > > Telit has already issued an App note on this. They tested their > GPS with a GPS simulator. One of their common models will

Re: [time-nuts] GPS week rollover

Sent from my iPhone > On 28 Mar 2019, at 23:45, Gary E. Miller wrote: > > Yo Mark! > > On Thu, 28 Mar 2019 20:38:42 + > Mark Sims wrote: > >> I doubt that any GPS receivers will be newly affected on April 6. > > Telit has already issued an App note on this. They tested their GPS >

Re: [time-nuts] GPS week rollover

Yo Mark! On Thu, 28 Mar 2019 20:38:42 + Mark Sims wrote: > I doubt that any GPS receivers will be newly affected on April 6. Telit has already issued an App note on this. They tested their GPS with a GPS simulator. One of their common models will fail on April 6. Two more will fail in

Re: [time-nuts] GPS week rollover

I have a Z3816A that’s showing a yellow “ro” next to the date in LH and is 18 seconds ahead of a Motorola 12 channel (and my iPhone). I haven’t had time to look into it as I’m adjusting to “voluntary” retirement and trying to clear out some excess stuff. Steve > On Mar 28, 2019, at 1:30