From: Nathan Owens <nathan@nathan.io>
To: "Gary E. Miller" <gem@rellim.com>
Cc: starlink@lists.bufferbloat.net
Subject: Re: [Starlink] GPS Dongle?
Date: Mon, 14 Jun 2021 12:09:19 -0700 [thread overview]
Message-ID: <CALjsLJsCgw93g1B2DZqs_npB6PVPDgXD1WyKaECrBUKvwYucag@mail.gmail.com> (raw)
In-Reply-To: <20210614120705.31634f9a@spidey.rellim.com>
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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@rellim.com> wrote:
> Yo Nathan!
>
> On Mon, 14 Jun 2021 10:40:36 -0700
> Nathan Owens <nathan@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@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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next prev parent reply other threads:[~2021-06-14 19:09 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 14:55 Nathan Owens
2021-06-14 17:40 ` Nathan Owens
2021-06-14 19:07 ` Gary E. Miller
2021-06-14 19:09 ` Nathan Owens [this message]
2021-06-14 19:13 ` Nathan Owens
2021-06-14 20:18 ` Gary E. Miller
2021-06-14 20:25 ` Ricky Mok
2021-06-14 20:38 ` Gary E. Miller
2021-06-17 3:00 ` Nathan Owens
2021-06-17 3:04 ` Nathan Owens
2021-06-17 3:09 ` Gary E. Miller
2021-06-17 3:11 ` Nathan Owens
2021-06-17 3:15 ` Gary E. Miller
2021-06-14 19:40 ` Gary E. Miller
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