[time-nuts] Accuracy/drift of Garmin GPS 16 HVS 1 PPS output under invalid fix conditions...

[Tim Lister]

On Mon, Mar 11, 2019 at 4:04 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>
> Hi
>
> A “proper” timing device with antenna is a sub $100 sort of thing. It will be < 100 ns pretty much forever and ever.

"Proper" for pulsar radio astronomers, at least professional ones,
tends to be a hydrogen maser(s)...

>
> Bob
>
> > On Mar 11, 2019, at 4:44 PM, Steve Olney <t0502 at internode.on.net> wrote:
> >
> > Hi Bob,
> >
> > On 12/03/2019 12:19 am, Bob kb8tq wrote:
> >> I doubt you will find this sort of information in any spec sheet on a basic GPS. The only practical
> >> answer is going to be “try it and see”.
> >
> > Yes - agreed. I was hoping someone would have tried it already on the GPS 16 HVS unit as has been done for a different unit...
> >
> > https://blog.dan.drown.org/navspark-timer-drift-2/
> >
> > ...which returns about 0.1 ms drift in phase over 15 minutes.
> >
> > I'll do a test as suggested elsewhere between a locked GPS and one which is in invalid fix condition.
> >
> >> If this is for some sort of large scale system, that may not
> >> be the right way to do it……
> >
> > No - it's not a large scale system.  I want to time-stamp my Vela pulsar data.   Just recently I detected a glitch in the pulsar (the first amateur radio astronomer to ever do so with any pulsar AFAIK)...
> >
> > http://www.astronomerstelegram.org/?read=12466
> >
> > The professional guys were impressed with my data, but slightly disappointed it didn't have accurate time-stamping. I am working to rectify that for the next glitch.
> >
> > Cheers
> >
> > Steve
> >
> > HawkRAO
> >
> >
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