[ntp:questions] Linux NTPd using a older Trimble Thunderbolt GPS Receiver
stenn at ntp.org
Sat Jan 17 02:32:34 UTC 2015
Oceanos Admin writes:
> We were looking to use an older Trimble Thunderbolt 8 channel GPS
> receiver for providing a Stratum 1 time reference. I realize this is
> discussed on the ntp.org web site but sadly, the link to Trimble to
> get the driver (any any ntp driver) are now all dead links.
> We have it connected to a Linux host running Linux (RH 6.6) and we see
> the receiver. However, it is not providing any useful data to for the
> NTP application to use. We have used the configuration examples in the
> ntp.org site.
> When you do a ntpq -p, you see the source but it is never used
> (lacking the "*" to indicate it is active as the primary
> reference). We do understand the Trimble Thunderbolts can not be
> "polled" since it is lacking any firmware that supports it.
> # ntpq -p
> remote refid st t when poll reach delay offset jitt
> GPS_PALISADE(0) .GPS. 0 l - 32 0 0.000 0.000 0.0
> *kona.xxxxxxx.xx 18.104.22.168 2 u 81 128 377 0.491 3.889 0.59
> Is there anyone with the prior experience in getting these older
> Trimble units to work? Most of the information dates back to the early
> 2000's or so.
> Our desire is to get away from using an external Internet based public
> NTP site to limit possible security issues.
First, you can try opening a bug report using the "refclock - palisade"
Next, you could try using -dd to see what sort of debug output you get,
and mess around in refclock_trimble.c .
If all else fails, there are a number of decent and inexpensive USB GPS
pucks out there that might do well for you, instead.
Harlan Stenn <stenn at ntp.org>
http://networktimefoundation.org - be a member!
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