[time-nuts] Ashtech Z12T

[Bob kb8tq]

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.
>> 
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