[time-nuts] Thunderbolt cooling vs heating for stability

[Pete Lancashire]

sound like not worth it. My idea of 'cooling' was say keeping the insides
at something like 25C. Just having a 2nd TBolt as a spare would be easier

-pete

On Tue, Jan 18, 2011 at 9:41 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> There's pretty much nothing in a TBolt that wears out. The heat rise on the
> parts on the pc board is modest and the only heated part is the OCXO.
> Cooling down the OCXO actually increases the stress on it (more heater power
> pulled => more stress on the heater).
>
> Obviously you can get it to hot. The OCXO does have an upper temperature
> limit. I don't think that extreme measures are needed to keep it at a
> rational temperature. Simple fans and boxes seem to be working pretty well
> for people. Any setup that results in sub 60C temperatures at the OCXO is
> likely to have very little impact on reliability or performance.
>
> The more important question is how you package it to reduce gradients. If
> you use the internal sensor, it's location is a bit sub-optimal for tracking
> the OCXO. You could put all sorts of sensors throughout the package. An
> easier thing to watch is the correlation between external temperature and
> EFC voltage. As long as EFC correlates (positive or negative) with outside
> temperature, you have room for improvement.
>
> Bob
>
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Pete Lancashire
> Sent: Tuesday, January 18, 2011 12:16 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Thunderbolt cooling vs heating for stability
>
> Been getting ready to build a box for the t'bolt and instead of it all
> getting hotter to maintain a stable temp
> is the idea of cooling with a Peltier cooler, or a mix of a Peltier
> and a heater ?
>
> Extending life time is the major concern
>
> -pete
>
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