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

[Tim Shoppa]

That sort of control voltage shift is not unusual if you take an OCXO that
had been on for an extended period (for some of us... years or decades!),
let it cool, then start it up again.  Good google search terms are "OCXO
retrace" and "OCXO hysteresis".

Tim N3QE

On Mon, Jun 8, 2015 at 4:45 PM, Gerhard Wittreich <gerhard at wittreich.org>
wrote:

> 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>
> wrote:
>
> > 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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