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.
Cheers,
Magnus
On 02/27/2016 10:25 PM, Bob Camp wrote:
Hi
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.
Bob
On Feb 27, 2016, at 12:44 PM, Tom Miller <tmiller11...@verizon.net> wrote:
----- Original Message ----- From: "Daniel Watson" <watsondani...@gmail.com>
To: <time-nuts@febo.com>
Sent: Saturday, February 27, 2016 11:48 AM
Subject: [time-nuts] Inside a CTS 1960017 OCXO
Hi,
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:
http://syncchannel.blogspot.com/2016/02/10mhz-ocxo-teardown-cts-1960017.html
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.
Regards
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