[time-nuts] Thunderbolt E failing

[Bob kb8tq]

Hi

As far as anybody knows (which *is* a big qualifier indeed ….), the TBolt family only
does it’s “temperature compensation” stuff when it’s in holdover. While it’s locked, there
*appears* to be no compensation being done. If it’s doing anything while locked, it’s 
learning what the TC is, so it can use that information while in holdover.

Bob

> On Sep 12, 2020, at 3:52 PM, Matthias Welwarsky <time-nuts at welwarsky.de> wrote:
> 
> Kevin,
> 
> how long has it been in storage? I expect the GPSDO doing quite clever things 
> to compensate for temperature effects. There may be some parameters stored on 
> the device and the characteristics of the OCXO may have changed after being 
> turned off for an extended period.
> 
> Regards,
> Matthias
> 
> On Samstag, 12. September 2020 18:13:35 CEST Kevin Schuchmann 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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> 
> 
> 
> 
> 
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