[time-nuts] Achievable temperature stability for Thunderbolt environment?

Bob Camp lists at rtty.us
Sun Jan 16 13:43:48 EST 2011


Hi

I see a degree or more over the weekend sitting on the bench. With some effort that can be brought down to a half degree or so.

The real question is weather you see the "signature" of the temperature showing up in the EFC plot. To be precise do you see the signature of the lab temperature, or (if the antenna is outdoors) the outside temperature?

If the EFC signature has either one of these (or both) then you could take action to improve things. If neither one shows up, then you are probably "good enough" on temperature. Of course there is the nasty issue of gradients and drafts, that all assumes that you have some sort of enclosure to suppress them. 

Bob


On Jan 15, 2011, at 11:36 AM, Achim Vollhardt wrote:

> Hi list,
> as my Thunderbolt is now nicely cooking for a few weeks now, I am wondering what a typically achievable ambient temperature stability/variation is in your setups.
> 
> Of course, a more stable environment is better, but currently I am struggling to achieve more than +-0.5 K variation on the temperature reading on a weekend.. during working days (when I am around in the lab), the variations are as much as 3 times higher.
> 
> I am just wondering, if I should rather worry more about high temperature gradients rather than excursions from a mean value, as slow variation can be compensated by the control loop while for quick changes, the loop is just too slow :)
> 
> 73s Achim, DH2VA
> 
> 
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