Hi Joe! The Gps receiver module inside the XL-AK could have been hit by the 1024 week problem. Do the XL box have a display showing date/year? What does that show? --    Björn Sent from my smartphone. -------- Original message --------From: Joe Pendergrass <w6vi@bellsouth.net> Date: 02/01/2017 23:29 (GMT+01:00) To: time-nuts@febo.com Subject: [time-nuts] TrueTime/Symmetricon XL-AK date reset failure Hello, all. I am a new member, having discovered this forum a few days ago, whilst doing a Google search looking for current telephone contact information for TrueTime/Symmetricon technical support. For many years I've had a TrueTime/Symmetricon Model XL-AK GPS time & frequency receiver in service here, which drives multiple serially slaved 9-digit LED IRIG-B remote readouts spread around my station. They display the day-of-the-year [counted up from 1/1] and the satellite GMT time. At midnight on each January 1st, the display always updated to reflect the coming of a new calendar year, and the day-of-the-year on the remote displays would reset to "0" [Zero]. On 1/1/2016, I noticed that the day counter display did not automatically reset to zero, and start over. The day counter display continued increasing incrementally, until 139 days ago, it finally reset itself to zero and started incrementally increasing again from [day] 1. Which means that the day-of-the-year counter function currently reads "139," when it should read "2." The time display has always remained accurate. I had hoped the day counter issue would resolve itself at midnight on 1/1/2017; but nothing changed. I know that the TrueTime/Symmetricon XL-AK and XL-DC GPS receivers are popular, and now that I have discovered this forum; I would like to solicit feedback as to what the root of the problem is and how to remedy it, from anyone on the forum having personal experience with this line of GPS receivers. Ideas??? Thanks de Joe-W6VI _______________________________________________ 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 instructions there.

 Björn

Hi again Joe, Yesterday was 2 Jan. Which was GPS week:day 1930:2. Walk back 1024 weeks and we are in 906:2. Monday in GPS week 906 was May 19th 1997. And that was also the 139th day in 1997. And I think we can confirm the cause of your problem. How to fix it... the GPS receiver module beeing 20+ years old is unlikely to have a firmware update. But try to identify the model and maybe there is a more modern receiver module that works in your box. Another option could be modifying the XL-AK box firmware to add 1024 weeks to the date. The good thing is that its only the date that is computed wro&#324;g. Position and time-of-day, 1pps etc are all working as good as before. -- Björn > On 1/1/2016, I noticed that the day > counter display did not automatically reset to zero, and start over. The > day > counter display continued increasing incrementally, until 139 days ago, it > finally reset itself to zero and started incrementally increasing again > from > [day] 1. Which means that the day-of-the-year counter function currently > reads "139," when it should read "2." The time display has always remained > accurate. I had hoped the day counter issue would resolve itself at > midnight > on 1/1/2017; but nothing changed. > > > > I know that the TrueTime/Symmetricon XL-AK and XL-DC GPS receivers are > popular, and now that I have discovered this forum; I would like to > solicit > feedback as to what the root of the problem is and how to remedy it, from > anyone on the forum having personal experience with this line of GPS > receivers. Ideas??? > > > > Thanks de Joe-W6VI > > > > > > _______________________________________________ > 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 instructions there. > _______________________________________________ > 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 instructions there. >