[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Achim Gratz Stromeko at nexgo.de
Mon Jan 22 13:41:10 EST 2018

Paride Legovini via time-nuts writes:
> I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm
> looking for a good and possibly affordable timing GPS receiver.

Unless you plan to use the timing receiver for some other function, it
really is overkill for the purpose of setting up an NTP server and
otherwise also requires you to set up a proper antenna in order to
benefit from the extra precision.

> Am I overlooking something or missing interesting options?

I think that setting up at least three "good enough" NTP stratum-1
servers in your network gets you much better synchronization than trying
to get a single one more precise.  To that end, you can set one up for
around $60 if you use a raspberryPi and a NavSpark mini w/ patch antenna
(if you have reasonable reception with that).  You'll find that the NTP
clients will not see any measurable improvement once you have the NTP
servers down below 10µs deviation and it's possible to get each
individual server consistently below 1µs with a bit of care.  Having at
least three stratum-1 in your network will keep the clients synchronized
correctly when inevitably one of the servers will have the occasional
problem that makes its time wander off for a while.

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