[time-nuts] Ashtech Z12T

[Michael Wouters]

Hello

There are many alternatives to the Z12T. It all depends on your budget. I
am guessing that you want to establish legal traceability to your local
UTC, is that right?

Starting at the top end, you can buy complete systems from Dicom and
Piktime. These cost about $25K and $40K respectively. These are
multi-frequency, multi-GNSS systems.

There are also some cheaper, single frequency systems (GPS only)  available
too, from a company in Japan and one in the U.K. Just search for "time
transfer system".

Some NMIs in countries like Canada, Australia, Japan, ... offer remote
calibration services of the kind you want to set up. These  are too far
away for common view but I suppose all in view would be the method in this
case ( you would still have traceability to your UTC via the CIPM Mutual
Recognition Agreement). Costs are something like $5K per year, in addition
to the hardware.

You can just buy a shiny new time-transfer receiver like the Septentrio
PolaRx5TRPRO with a geodetic antenna for about $20K. These are the most
popular in the timing community at the moment. But other receivers like
Javad and Trimble are good too.

If single frequency performance is good enough, and you're willing to do a
bit of work setting up software, then the really low cost solution is
something like the software from www.openttp.org
The main receiver supported, the NVS NV08C is less than $100. You can get
accurate antenna positions from this receiver in a base rover
configuration. All the rest is post processing and there are various
options here. You will also need a counter/timer and the low cost solution
here is the TAPR TICC, which is also supported by OpenTTP.

Cheers
Michael


On Mon, 3 Dec 2018 at 10:21 pm, JF PICARD via time-nuts <
time-nuts at lists.febo.com> wrote:

> Thank you for answer and sorry for delay. 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  . Today the cesium is running alone.
> Discussion with some people involved in this worlwide common practice spoke
> about the Z12T but if there is anything more modern..
> --------------------------------------------
> On Wed, 11/28/18, Tom Van Baak <tvb at LeapSecond.com> 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, 10:12 PM
>
>  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.
>  >
>  >
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