[ntp:questions] Indirect GPS time source options

Olivier Drouin ol.drouin at gmail.com
Thu Mar 13 14:51:01 UTC 2014


Oops, I said

It is different of GPS because if your WAN links are down, which can happen
once every few years,  then, hopefully, you can still reach the cellular
network in your neighborhood or else its the end of the world or
something...

but it should read

It is different from using ntp to go to a level 1 server because if your
WAN links are down, which can happen once every few years,  then,
hopefully, you can still reach the cellular network in your neighborhood or
else its the end of the world or something...





On Wed, Mar 12, 2014 at 3:59 PM, William Unruh <unruh at invalid.ca> wrote:

> On 2014-03-12, Olivier Drouin <ol.drouin at gmail.com> wrote:
> > Hello,
> >       I'm located in Canada and I'm trying to find indirect GPS time
> sources.  I like the idea of using CDMA as a time source but it seems that
> this technology will not be around for a lot longer.
>
> What is an "indirect gps timing source"? How does that differ from using
> ntp to go to a level 1 server which gets its time from gps. While cdma
> uses accurate time, it is not really designed to deliver accurate time.
> GPS is.
>
> >       For exemple, Endrun Technologies sells the Sonoma N12 which seems
> to allow time synchronization against CDMA signal without the need for a
> carrier subscriptions.
> >
>
> And a gps receiver with PPS output is probably 1/100 the price.
>
> >
> >        Is the CDMA method still available with these other cellulare
> network technologies like HSPA or LTE? If not, do I have other options
> beside a GPS antenna with a sky view?
>
> CDMA also needs an antenna with cell tower view. What's the difference?
> (Note my gps on an east facing window through a large cedar tree works
> just fine.)
>
> >
> >
> >
> >        Thank you and best regards,
> >        Olivier Drouin.
>
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