[time-nuts] TymServe 2100 and the 1995 GPS issue

Gerhard Wittreich gerhard at wittreich.org
Mon Jun 8 16:45:46 EDT 2015

I just received the Heol Design N024 Trimble ACE III clone to resolve the
week rollover problem we have been experiencing in the TS-2100's with the
original Trimble ACE III gps units.  Installation was very straight forward
taking about 5 minutes.  On a cold restart I had "Tracking" within 40
seconds with the correct date and time (Leap second issue also resolved)
and "Locked" with my new OCXO in ~20 minutes.  Once locked I did notice
something interesting but maybe not important.  The control voltage to the
oscillator (timing > util > tfp 0) went from a very consistent 0xba6f to a
0xbb02.  That's about 0.2% of scale.  I'll watch it over the next few days
to see where it settles in.

Gerhard R Wittreich, P.E.

On Thu, Jun 4, 2015 at 11:38 AM, Sean Gallagher <sean at wetstonetech.com>

> Hey everyone,
> Just wanted to send this out.
> It is The documentation that Heol has sent me regarding the GPS
> replacement boards in the 2100. According to them so far they were able to
> correct the issues with some fancy firmware on their N024 board. He also
> told me they are going to support firmware updates up to 2035 in case more
> issues arise.
> He is sending me one of these new units and should arrive within the next
> 2 weeks and I'll let you know if it works in my 2100's and my
> Datum/Symmetricom BC635pci cards.
> Respectfully,
> Sean Gallagher
> Malware Analyst
> 571-340-3475
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