[time-nuts] Thunderbolt E failing

[Adrian Godwin]

I received one of these thunderbolts. It seems to work (currently
handicapped by an inadequate antenna) and is labelled P/N 48050-61  D/C
0331 on the outside.
The firmware is 3.00 and the OCXO labelled 37265 10.000000 MHz B11859-17495
0310.


On Sat, Sep 12, 2020 at 10:43 PM Adrian Godwin <artgodwin at gmail.com> wrote:

> 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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>