[ntp:questions] Trimble Thunderbolt support?

John Ackermann N8UR jra at febo.com
Sun Aug 19 18:02:34 UTC 2012

Thanks, Chris.  After three years of downtime and an extraordinarily 
painful nanoBSD upgrade from version 4.x to 9.0, I'm just getting my 
herd of Soekris 4501s running again and thought I might add a 
Thunderbolt to the mix since I'm no longer going to be able to use 
LORAN-C as one of my time sources. :-(


Chris Albertson said the following on 08/19/2012 01:26 PM:
> On Sun, Aug 19, 2012 at 7:16 AM, John Ackermann N8UR <jra at febo.com
> <mailto:jra at febo.com>> wrote:
>     The documentation at
>     http://www.eecis.udel.edu/~__mills/ntp/html/drivers/__driver29.html
>     <http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html>
>     indicates that support for the Trimble Thunderbolt GPSDO may be
>     incomplete, but the page was last updated in January, 2007.
>     Has anything been done since then to improve the Trimble support, or
>     are the problems noted there ones that don't affect normal
>     operation, such that I can plug the TBolt in and get good NTP
>     performance with the driver as-is?
> I'm using the t-bolt.  It seems to work.   I guess there might be more
> functions the driver could implement.  Perhaps better support for
> self-survey or logging or whatever.  I'd like to see internal
> temperature logged.  But for normal NTP use it works fine.
> If you only have one GPS the t-bolt is the one to have.  But if you can
> afford two there are lower priced GPSes that use less power that work
> well with NTP.   I have the t-bolt and two UT+ units.
> Whatever you get make sure it is a TIMING gps.  The Garmin units and the
> Sure Electronic board at not timing GPS although they do have PPS
> outputs.  They work but they are "uSec" level devices.  I'd look for
> 100ns or better.
> Chris Albertson
> Redondo Beach, California

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