Recommendation on NTP appliances/devices

bmanning at bmanning at
Fri Apr 4 04:24:01 UTC 2014

 Loves my old Heathkit WWVB unit.   Keeps drift in check most days.
 Pairs nicely with the Spectracom 9383.   

 Looking at the Microsemi TP-5000 w/ rubidium oscillator.


On Thu, Apr 03, 2014 at 10:25:07PM -0400, Rob Seastrom wrote:
> On a tangential note, it's all very nice to say "We have brand X and
> like them", but I'd be curious to hear from folks who have deployed at
> least four divergent brands with non-overlapping GPS chip sets and
> software [*] to keep a conspiracy of errors from causing the time to
> suddenly be massively incorrect.  Not that this has ever happened in
> the past in a single vendor configuration [cough].
> Along the same lines I'm troubled by the lack of divergent sources
> these days - everything seems slaved to GPS either directly or
> indirectly (might be nice to have stuff out there that got its time
> exclusively via Galileo or Glonass).  The sole exception that I can
> think of offhand is that I have an office within ground wave of WWVB,
> which would be a tasty ingredient.  GOES is gone.  LORAN is defunded.
> And so it goes; all our eggs are in one basket.
> I've thought about posting this request to the NTP developers list,
> but maybe someone who's an operator and actually cares about keeping
> the byzantine generals sequestered from each other has solved this
> problem recently.
> Clues?
> -r
> [*] to the extent possible; I'm sure that there's a lot of reference
> implementation DNA floating around out there)
> Berry Mobley <berry at> writes:
> > We have symmetricom (now microsemi) and are very happy with them, but we use the roof mounted gps antennas. They will peer with public ntp severs if that would work for you. 
> >
> > David Hubbard <dhubbard at> wrote:
> >
> >>Anyone have recommendations on NTP appliances; i.e. make, model, gps vs
> >>cell, etc.?  Roof/outdoor/window access not available.  Would ideally
> >>need to be able to handle bursts of up to a few thousand simultaneous
> >>queries.  Needs IPv6 support.
> >>
> >>Thanks!
> >>

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