[time-nuts] Thunderbolt E failing

[Adrian Godwin]

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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