[time-nuts] Thunderbolt E failing

[Adrian Godwin]

Thanks!

The one I've seen pictured most often comes in a (I think) slightly lower
gold-coloured (alocromed) case.
e.g. http://www.sydneystormcity.com/TrimbleThunderboltGPS.jpg
Is that any different ?

I did order the one from my link so will report on any markings. The vendor
mentioned part 48050-61 but as you say, that seems to be common to all of
them.


On Sat, Sep 12, 2020 at 10:14 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> The unit your link points to *is* the “classic” TBolt that showed up in
> volume a bit
> over a decade ago. That one is packaged with a (noisy) switching power
> supply.
>
> There is no easy way to tell what era it is from. Indeed if it is from the
> 1990’s the
> OCXO will not be quite as good as what’s in one from > 2002. Since the
> unit normally
> operates locked, that’s not a real big deal.
>
> Since Trimble used “Thunderbolt” for a whole line of parts *and* was not
> very good
> at labeling devices, there is no easy way to refer to this or that
> specific device. That
> makes coming up with a list of units a bit hard. For example - what’s the
> model number
> of the part in that eBay listing ? ( No I don’t know either …. :) ).
>
> Bob
>
> > On Sep 12, 2020, at 12:28 PM, Adrian Godwin <artgodwin at gmail.com> wrote:
> >
> > I've been looking for a thunderbolt for a while, mostly because they're
> > such a benchmark within this group. I missed the period when they were
> more
> > commonly available and have mostly found ones that were a lot more
> > expensive, or had a large delivery cost due to being in Australia.
> >
> > Some cheaper examples turned up on UK ebay. These aren't the classic
> > time-nuts ones but presumably look fairly similar to Lady Heather.
> >
> > https://www.ebay.co.uk/itm/154078750287
> >
> > I haven't been able to find a comparison of the various thunderbolt
> models.
> > Is there a description somewhere ? I've found a few hints about this one
> -
> > I think it's a single 48V supply and possibly a lower-quality OCXO.
> >
> > On Sat, Sep 12, 2020 at 5:14 PM Kevin Schuchmann <kschuchm at gmail.com>
> wrote:
> >
> >> Matthias,
> >>    You are correct, having spent hours looking at all the stable areas
> >> and cooling and heating the gpsdo I find that when it reports that it is
> >> 116.25 F then it is stable.
> >> So now I guess I need to figure out why it is so picky. I will measure
> >> the current draw from a cold start and see if I see the oven warming up
> >> and then stabilizing and then heat and cool it and see how it reacts,
> >> and also look at the electronics and see if an area is overly sensitive
> >> to temperature.
> >>
> >> Thanks
> >> Kevin
> >>
> >>
> >> On 9/11/2020 2:26 AM, Matthias Welwarsky wrote:
> >>> On Freitag, 11. September 2020 01:08:09 CEST Kevin Schuchmann wrote:
> >>>> Guess my image didn't make it, I will add it as an attachment this
> time.
> >>> The temperature curve seems to show some correlation to what is
> >> happening with
> >>> the DAC. Seems that the DAC and OSC jumps are mostly during periods of
> >> some
> >>> thermal perturbation.
> >>>
> >>> Regards,
> >>> Matthias
> >>>
> >>>
> >>>
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