[time-nuts] Brand new OCXO/TCXO reccomenations

[Bob kb8tq]

Hi


> On Sep 25, 2020, at 5:44 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
>> 1) In an unconditioned/semi-conditioned space.   The ambient temperature can
>> slew 20*C easily over the holdover period.   (Think sun hitting an outdoor
>> enclosure first thing in the morning - the ambient temperature tends to rise
>> quickly). 
> 
> It would be interesting to get some data on that.  Clouds blocking the sun or 
> holes in the cloud cover would be a variation.

A lot of OEM’s have data on that sort of thing. The only time you see 20C in 10
minutes is when the building catches fire :)

Bob

> 
> If the sun hits the enclosure, how long does it take the air inside to heat up 
> and then how long does it take the gear inside to warm up?
> 
> One of the classic tools for problems like this is to attach a big blob of 
> stuff to the crystal to dampen thermal changes.  When you design your test 
> setup, can you leave room for a brick and collect data with and without when 
> you toss it into the freezer?
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
> 
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