Hi
The “normal” approach is to stabilize the inner wall and cross section (= open
tube)
of the dewar. Often this is done with a metal “plug”. It may or may not extend
to the
bottom of the dewar. A lot depends on fiddly little details about how much heat
you are generating in the circuitry
Question:
Do you stabilize the oscillator inside the dewar, or do you stabilize the
temperature of
the dewar's outside environment?
This may boil down to a slightly different expression: Where do you *sense*
the temperature for
the stabilization loop? On the crystal itself, or on the outside
Hi
There are a lot of dewar / vacuum flasks on eBay in a wide variety of
shapes and sizes. Some get into the proper combination of affordability,
size and shape. There does not appear to be a constant supply of any
one version so it is very much shop and see.
Dewar based OCXO’s go way back ( in
Hello!
I have done this and can attest that it works well. I did not use a TCXO,
though. I used a 48 MHz, third-overtone AT-cut crystal in a Colpitts
oscillator configuration. The vacuum flask was ovenized to maintain
temperature near the stationary point of the temp characteristic (near 50
Hello TOM,,
I have one underway via Aliexpress.
In a research project at a university ,a side line is stability of some
sources.
Apart from more classical measurements, the setup of the FSA3011 and
measurements of several sources can be done by one ore more students as
project work.
This however
