Jump to content


Photo

Will our LS GPS units continue to work OK on April 6/7?


  • Please log in to reply
No replies to this topic

#1 OleCuss

OleCuss

    Newbie

  • Members
  • Pip
  • 5 posts

Posted 08 March 2019 - 09:35 AM

April 6/7 is a GPS roll-over date and my question is whether anyone knows if this will be a problem for our LS-6 and LS-8 units.

 

For those who do not know, the GPS satellites transmit date and time information to our GPS receivers and the provision for the week information is 10-bits of information.  That means that every 1024 weeks you run out of space in the data to specify a new week.  Effectively that means that your GPS unit is supposed to roll-over and start counting the weeks all over again beginning April 6/7.

 

But some older GPS units may not have firmware which will interpret things correctly and might kick out information indicating instead that the date is in the August 21/22, 1999 range which is when the last GPS roll-over occurred.

 

If the GPS receiver has been updated to the GPS ICD standard then this should not be an issue.  The week should be properly interpreted and we should not have issues.

 

But if our LS receivers are not set up to handle this, we may have some interesting issues?  So I'm curious as to whether anyone knows if we are going to have problems.

 

 

BTW, the newer standard is to use 13 bits for the information and it will be a very long time before we have this issue arise once again.  We had it 19.7 years ago and we have it now, but none of us are likely to be alive when 13 bits aren't enough. . .

 

 

 

And yes, I've not been doing much with my LS-8.  I got it, did first light, and my eyes went bad in a manner which is incompatible with the eyepiece.  That will likely get resolved but it may be a while.



#2 MistrBadgr

MistrBadgr

    Advanced Member

  • Administrators
  • 2957 posts
  • LocationBroken Arrow, Oklahoma

Posted 12 March 2019 - 01:00 PM

I have sent an email to Luis in Customer Service, copying your post.  He did not readily have an answer, but he did remember some discussion about it at some point in the past.  He will see what he can do to get us a definitive answer.

 

Bill Steen

 

PS.  I am running a bit slow on things right now.  Had a disagreement with some black ice in my driveway a week and a half ago.  I now have a new stainless steel top to my right femer and a new ball for the right socket in my hip.  Did not see your post until just now.


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#3 RickScofield

RickScofield

    Advanced Member

  • Members
  • PipPipPip
  • 325 posts
  • LocationBellevue,Nebraska

Posted 12 March 2019 - 06:09 PM

WOW Bill you take it easy. I am sure you don’t have much choice right now. I hope you get up to speed soon.

Rick

#4 MistrBadgr

MistrBadgr

    Advanced Member

  • Administrators
  • 2957 posts
  • LocationBroken Arrow, Oklahoma

Posted 13 March 2019 - 07:57 AM

Thanks, Rick!


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#5 MistrBadgr

MistrBadgr

    Advanced Member

  • Administrators
  • 2957 posts
  • LocationBroken Arrow, Oklahoma

Posted 13 March 2019 - 08:10 AM

I received a reply from Meade on the subject of the GPS satellite date number rollover.  Naturally, when I saw it I was a bit sleepy, and did not manage to save it properly.  Here is the gist of what Luis said:  Meade is aware of the issue and believes the software in the scopes will work properly.  They have not issued an official statement, but are working one one now.

 

Hope this helps and is accurate!

 

Bill


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users