Re: [time-nuts] Z3801A gps week rollover

.@febo.com] On Behalf Of Hal Murray Sent: Thursday, September 08, 2016 2:54 PM To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Z3801A gps week rollover petervince1...@gmail.com said: > Can I just ask why the Z3801

[time-nuts] Z3801A gps week rollover

You might want to try some lithium AA cells. They start out around 1.65V. They are MUCH less prone to leakage than any "alkaleak" battery and have a very long shelf-life (i.e. good for low drain memory backups). As always, when adding a backup battery to a GPS, verify that the battery

Re: [time-nuts] Z3801A gps week rollover

The gps rcvr does not have a batter but will indeed support an external battery. I attached 2 AA batteries in a external easily replaceable holder and ran the 2 wires to the receiver 10 pin plug. (At least I think it was 10) I change the batteries every 2 years not so much for voltage as concern

Re: [time-nuts] Z3801A gps week rollover

kb...@n1k.org said: > The bigger problem for NTP is when the leap second correction process is > thrown off by the “time warp”. When leap seconds get fixed in mid-August > rather than the end of June … not a good thing. Is that still a problem? If so, do you have any details. I don't

Re: [time-nuts] Z3801A gps week rollover

On 09/09/2016 01:17 PM, Bob Camp wrote: Hi On Sep 9, 2016, at 3:06 AM, Magnus Danielson wrote: Hi, On 09/08/2016 11:53 PM, Hal Murray wrote: petervince1...@gmail.com said: Can I just ask why the Z3801As are having week roll-over problems now - I didn't

Re: [time-nuts] Z3801A gps week rollover

Hi > On Sep 9, 2016, at 3:06 AM, Magnus Danielson > wrote: > > Hi, > > On 09/08/2016 11:53 PM, Hal Murray wrote: >> >> petervince1...@gmail.com said: >>> Can I just ask why the Z3801As are having week roll-over problems now - I >>> didn't think it was 2048 weeks

Re: [time-nuts] Z3801A gps week rollover

Hi, On 09/08/2016 11:53 PM, Hal Murray wrote: petervince1...@gmail.com said: Can I just ask why the Z3801As are having week roll-over problems now - I didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th of April 2019? It's probably 1024 weeks since a date was built

[time-nuts] Z3801A gps week rollover

The Z3801A status page takes 3 seconds to process/send. Not surprising that the time is a bit off. Lady Heather only requests the SYST:STAT message once per minute (at hh:mm:33 seconds) because it blocks the unit from doing anything else while it is handling it. The main things extracted

Re: [time-nuts] Z3801A gps week rollover

hol...@hotmail.com said: > Happy until the next power glitch... the setting does not seem to persist > between boots. There may also be other conditions that causes it to forget > your date. I just power cycled mine. It came back correct without setting the date. I've assumed there is a

Re: [time-nuts] Z3801A gps week rollover

That makes sense - thanks guys! Peter On 8 September 2016 at 22:53, Hal Murray wrote: > > petervince1...@gmail.com said: > > Can I just ask why the Z3801As are having week roll-over problems now - > I > > didn't think it was 2048 weeks since GPS "zero-hour"

Re: [time-nuts] Z3801A gps week rollover

petervince1...@gmail.com said: > Can I just ask why the Z3801As are having week roll-over problems now - I > didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th > of April 2019? It's probably 1024 weeks since a date was built into the firmware. It's like the year 2000

Re: [time-nuts] Z3801A gps week rollover

Hi After the first batch of GPS devices rolled over, the manufacturers came up with a “fix” for the problem. If the date came out to a number *before* the firmware was issued, it was corrected forward in time. This only works over a single span of GPS dates. Depending on when the firmware

Re: [time-nuts] Z3801A gps week rollover

Can I just ask why the Z3801As are having week roll-over problems now - I didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th of April 2019? Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Z3801A gps week rollover

Yes, rollovers should not be a problem and should only affect the date display. However, I have seen devices/software that use GPS fail to work because of what appears to be an invalid date. It seems that they are validating the data from the receiver and if, for instance, the date is

Re: [time-nuts] Z3801A gps week rollover

they have no effect on 1PPS or 10 MHz outputs. > > /tvb > > - Original Message - > From: "paul swed" <paulsw...@gmail.com> > To: "Discussion of precise time and frequency measurement" < > time-nuts@febo.com> > Sent: Thursday, Septembe

Re: [time-nuts] Z3801A gps week rollover

2016 8:16 AM Subject: Re: [time-nuts] Z3801A gps week rollover > Mark, > From some earlier threads on rollovers. Do you even need to set the time at > all? > Granted not great if the 3801 is a time source, but if its just frequency > do you care? > Thanks > Paul > WB8

Re: [time-nuts] Z3801A gps week rollover

Mark, >From some earlier threads on rollovers. Do you even need to set the time at all? Granted not great if the 3801 is a time source, but if its just frequency do you care? Thanks Paul WB8TSL On Tue, Sep 6, 2016 at 11:30 AM, Mark Sims wrote: > Happy until the next power

[time-nuts] Z3801A gps week rollover

Happy until the next power glitch... the setting does not seem to persist between boots. There may also be other conditions that causes it to forget your date. And when setting the date, you should disconnect the antenna first, then power on. Once the unit starts tracking satellites you

Re: [time-nuts] Z3801A gps week rollover

I had one that screwed up. I power cycled and set the date. It's happy now. I'm not sure of the exact recipe to tell it the right date. After feeding it a date of roughly today, the status screen jumped to Jan 2007. After it found a few satellites and such, it jumped to Sep 2016. --

Re: [time-nuts] Z3801A gps week rollover

That would be sunday midnight, GPS time, as GPS time-gears have GPS week shift between saturday and sunday. This naturally makes Monday extra monday as the system that fail do it during sunday. Cheers, Magnus On 09/05/2016 06:29 AM, Mark Sims wrote: I did a little math on the dates and it

Re: [time-nuts] Z3801A gps week rollover

hol...@hotmail.com said: > I did a little math on the dates and it looks like the rollover happened in > the last couple of days... Thanks for the heads up. Mine started on Aug 17th /var/log/ntp/clockstats.20160817:57617 2.033 127.127.26.1 T21997010102300103 8 64 0 That's from ntpd's

Re: [time-nuts] Z3801A gps week rollover

Hi The rollover is in the GPS module firmware. If you dig into it, they didn't quite update the firmware once every 3 months, but almost that often. Each manufacturer latched onto various versions as they sailed by. None of them had a validation process that could keep up with 4 releases a

Re: [time-nuts] Z3801A gps week rollover

On 9/4/2016 10:48 PM, Mark Sims wrote: Sometime (I didn't have it connected) in the last couple of weeks my Z3801A went into gps week rollover. If you have a Z3801A that had been working properly you might want to check yours. Different firmware versions roll over at different times. My

[time-nuts] Z3801A gps week rollover

I did a little math on the dates and it looks like the rollover happened in the last couple of days... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

[time-nuts] Z3801A gps week rollover

Sometime (I didn't have it connected) in the last couple of weeks my Z3801A went into gps week rollover. It now reports the year as 1997. It had been working propely. Lady Heather caught the anomaly and automatically added 1024 weeks worth of seconds to the date/time which compensated for