[time-nuts] Ashtech Z12T

[JF PICARD]

Hello,

Thank you for answer and sorry for delay. As I explained to another answer, purpose is simultaneous view of GPS satellites with the french official time laboratory LNE SYRTE . The corrections factors from the laboratory will enable to get with our high performance cesium about 5. 10-13  . Offset is for us without any utility.
You spoke about Novatel boards ; can you please explain more.

JFP




--------------------------------------------
On Wed, 11/28/18, Bob kb8tq <kb8tq at n1k.org> wrote:

 Subject: Re: [time-nuts] Ashtech Z12T
 To: "Discussion of precise time and frequency measurement" <time-nuts at lists.febo.com>
 Date: Wednesday, November 28, 2018, 11:17 PM
 
 Hi
 
 Only as an example: 
 
 One key “feature” of the Z12T is the
 ability to come up with an absolute offset between a local
 
 reference and GPS time. To some degree,
 that is as much a function of the Z12T being in some
 sort of “round robin” comparison system as
 anything else. If that full offset information is part 
 of what you need, that adds even more
 complexity to the request. 
 
 A somewhat more modern approach than the Z12T
 would be one of the new(er) Novatel boards
 and a bit of custom code running on it. Even
 there the same problem(s) with calibrating an 
 offset come up. 
 
 Note that indeed you *can* get a time offset
 number from a simulator feeding the device. How 
 good that number is (and how much you trust it)
 is very much a “that depends” sort of thing. 
 Again - right back to the “what are you
 trying to do?” question. 
 
 Bob
 
 > On
 Nov 28, 2018, at 4:12 PM, Tom Van Baak <tvb at leapsecond.com>
 wrote:
 > 
 > The Z12T
 is a bit old by now, although some of us own or have used
 them. Z12 documentation is available on multiple archived
 Ashtech web sites. Lots of conference / technical papers
 describing time transfer with Z12T receivers exist. AFAIK a
 number of national timing labs still use them.
 > 
 > What is it
 you're trying to do? Do you own a Z12T and are just
 looking for spare parts? Or are you looking for modern time
 transfer via GPS / GNSS? If so, what level of timing
 accuracy are you looking for? Perhaps you could explain a
 bit more what your actual request is, or what timing
 infrastructure you already have running.
 > 
 > /tvb
 > 
 > ----- Original
 Message ----- 
 > From: "JF PICARD
 via time-nuts" <time-nuts at lists.febo.com>
 > To: <time-nuts at lists.febo.com>
 > Cc: "JF PICARD" <jfphp at yahoo.com>
 > Sent: Wednesday, November 28, 2018 9:33
 AM
 > Subject: [time-nuts] Ashtech Z12T
 > 
 > 
 >> Hello,
 >> I am
 looking for a time transfer system Ashtech Z12T or
 equivalent. Thank you.
 >> 
 >>
 _______________________________________________
 >> time-nuts mailing list -- time-nuts at lists.febo.com
 >> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 >> and follow the instructions there.
 >
 
 > 
 > 
 >
 _______________________________________________
 > time-nuts mailing list -- time-nuts at lists.febo.com
 > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 > and follow the instructions there.
 
 
 _______________________________________________
 time-nuts mailing list -- time-nuts at lists.febo.com
 To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 and follow the instructions there.