[time-nuts] Need Time Help

Clint Jay cjaysharp at gmail.com
Tue Oct 4 04:12:15 EDT 2016


What's being transmitted?

If it's a repetitive message would it be possible to inhibit transmission
using an external time source, perhaps a PIC or even a Pi inhibiting the
"PTT", leaving the windows box in control of what's transmitted or do the
Windows boxes have to communicate with each other via some back channel?

On 4 Oct 2016 08:30, "Chris Albertson" <albertson.chris at gmail.com> wrote:

> On Mon, Oct 3, 2016 at 9:41 PM, Larry Hower <hower at hower.net> wrote:
>
> >
> >
> > 1. We are using desktops and laptops in separate locations running XP or
> > Win 10.
> >
>
> Assuming you have decent GPS receivers with an un-obstructed view of the
> sky with 1 pulse per second output and you have let the GPS run long enough
> to track enough satellites  then...  The pulse typically has a standard
> deviation on the order of some tens of nanoseconds.   So that is not your
> problem.  It is software., well mostly.  Also computers that manage power
> like notebooks are not going to give good timing performance no matter what
> you try.
>
> MS Windows is not the best choice for running NTP.   You can do it.  and
> many people have gotten results better then 1 millisecond.  But
> If you are willing to give up the use of MS Windows.  Then tens of
> microseconds is not hard.
>
> Little $35 credit card sized computers (Raspberry Pi) running Linux and NTP
> with a GPS input are easy to get an order of magnitude better than your
> requirement.
>
> So are you stuck with windows.  f so it can work with some rather complex
> setup.   If you can select another OS then you get out of the box
> sub-millisecond performance with little effort
>
>
> --
>
> Chris Albertson
> Redondo Beach, California
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