[Starlink] GPS Dongle?

[Nathan Owens]

Thanks for the info Gary!

Why wouldn't you recommend the hat? Anything you'd recommend that is
actually purchasable? I can't seem to find any of the Navisys units, and
ideally non-USB would be better?

On Mon, Jun 14, 2021 at 12:07 PM Gary E. Miller <gem at rellim.com> wrote:

> Yo Nathan!
>
> On Mon, 14 Jun 2021 10:40:36 -0700
> Nathan Owens <nathan at nathan.io> wrote:
>
> > Sorry, it was MACx-1, but either way, I decided to go for an Adafruit
> > Raspberry Pi GPS "Hat", which does 1PPS.
>
> I do not recommend that HAT.  There are much better ones available at
> similar prices.
>
> > I'll setup a raspberry pi
> > with RT_PREEMPT
>
> RT_PREEMPT is overkill.  The best you can get on a RasPi is about 54ns
> accuracy.  Due to the clock granularity of 54ns.
>
> > and run as a Stratum-1 Clock locally.
>
> But always have other chimers in your configuration file.
>
> > This should
> > help with better irtt timings. This can be done for <$100 if anyone
> > else wants super accurate time.
>
> For some definition of "super".
>
> > > Does anyone know if any MAC1-X GPS dongles or anything similar are
> > > available anywhere?
>
> They pop up now and then.  Right now GPS parts are hard to find, much
> less at good prices.  Search for Navisys GR-601W, GR-701W, or GR-801W.
> The "W" suffix says it outputs PPS.
>
> The MAC1-X, or any PPS over USB, will only get you to > 1 milli second
> because of the USB.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem at rellim.com  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>     "If you can't measure it, you can't improve it." - Lord Kelvin
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