[time-nuts] Inside a CTS 1960017 OCXO
magnus at rubidium.dyndns.org
Sat Feb 27 18:14:25 EST 2016
A metal shield provides to aspects, firstly it will act as a windshield
and keep some air confined and secondly, it will help equalize the
temperature surrounding the oven such that it itself reduces temperature
gradients, simply by being a better conductor of heat than the air. You
still have black-body convection for sure.
For lesser oscillators, just putting a small plastic hut over the
crystal have improved things greatly.
On 02/27/2016 10:25 PM, Bob Camp wrote:
> A small air gap is actually a better insulator than conventional foam. You don’t get
> much of a convection cell going at those spacings. The part likely pulls a bit over a
> watt at room.
> If you put an insulator on the gizmo you increase it’s thermal gain. That will most likely
> make the temperature performance significantly worse. See the good old papers on the
> HP super ovens for all the details.
>> On Feb 27, 2016, at 12:44 PM, Tom Miller <tmiller11147 at verizon.net> wrote:
>> ----- Original Message ----- From: "Daniel Watson" <watsondaniel3 at gmail.com>
>> To: <time-nuts at febo.com>
>> Sent: Saturday, February 27, 2016 11:48 AM
>> Subject: [time-nuts] Inside a CTS 1960017 OCXO
>>> I'm sure many of you are tracking the cheap CTS 10MHz OCXOs available on
>>> eBay right now. I purchased a case of them, and decided to crack one open.
>>> I took pictures along the way, thinking that might be interesting to the
>>> list. Here is the blog post if you are interested:
>>> Comments on the internal construction of the OCXO are welcome. It seems
>>> pretty straightforward inside though.
>>> Best regards,
>>> Dan W.
>> Looks like it would use a lot of power in a cold environment. Maybe a second oven would be nice. They seem to have marked the turnover temp on the xtal.
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