Re: [Starlink] GPS Dongle?

[Nathan Owens <nathan@nathan.io>]

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I should note this is very fresh and the jitter is dropping.

     remote           refid      st t when poll reach   delay   offset
 jitter
==============================================================================
o127.127.22.0    .PPS.            0 l    5   16  377    0.000    0.285
0.014

On Wed, Jun 16, 2021 at 8:00 PM Nathan Owens <nathan@nathan.io> wrote:

> Hey Gary,
>
> Got this running:
>
> pi@realtimepi:~ $ ntpq -crv -pn
> associd=0 status=0115 leap_none, sync_pps, 1 event, clock_sync,
> version="ntpd 4.2.8p12@1.3728-o (1)", processor="armv7l",
> system="Linux/4.19.71-rt24-v7l", leap=00, stratum=1, precision=-20,
> rootdelay=0.000, rootdisp=1.195, refid=PPS,
> reftime=e4753908.36ea5b4a  Wed, Jun 16 2021 19:59:20.214,
> clock=e4753915.668e763d  Wed, Jun 16 2021 19:59:33.400, peer=23018, tc=4,
> mintc=3, offset=0.298251, frequency=-22.915, sys_jitter=0.149930,
> clk_jitter=1.980, clk_wander=0.051
>
>      remote           refid      st t when poll reach   delay   offset
>  jitter
>
> ==============================================================================
> o127.127.22.0    .PPS.            0 l   13   16  377    0.000    0.298
> 0.150
> *216.239.35.12   .GOOG.           1 u   36   64  377   61.574   -4.184
>  24.605
>
> Let me know how it looks, or if there's anything I could improve!
>
> On Mon, Jun 14, 2021 at 1:38 PM Gary E. Miller <gem@rellim.com> wrote:
>
>> Yo Ricky!
>>
>> On Mon, 14 Jun 2021 13:25:26 -0700
>> Ricky Mok <cskpmok@caida.org> wrote:
>>
>> > Attached a paper on this topic from my old colleagues.
>>
>> Not bad.  It skipped the important details of how they configured their
>> RasPi's.  It also made the very common mistake of over smoothing their
>> ADEV measurements.  Lacking a few now standard metrics.  Otherwise
>> sound.
>>
>> It is possible to do a little better now.
>>
>> 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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>

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