I don't have access to the full copy of the quoted reference, so don't know
whether or not specific part numbers are quoted, but did note from the abstract
the comment.....
"To allow the assembly on a board of 4TE width, the height of the OCXO is
limited to 19 mm"
This I would suggest could again point to the 8863, which is specified as
having a maximum height of 19mm, rather than to the 8663 which is specified as
having a maximum height of 25mm, perhaps to allow for some physical thermal
insulation?
Nigel GM8PZR
I don't know what your definition of a "true double oven" is, but
the 8663 definitely uses two ovens. You can find its construction in [1].
The basic design is that the crystal is mounted on a copper plate, which
becomes the inner oven, that is placed in a hermetically sealed package
that doubles as outer oven. All together is than mounted in the outer
package.
I guess the "low" performance of the double oven comes from the low
thermal mass of the innver oven. That said, Mark did some measurements
with the Star4 GPSDO (uses an 8663) and attested it superp holdover
performance.
Attila Kinali
[1] "A new kind of view for a Double oven Crystal Oscillator"
by Lefebvre, Weber, Aubry, 2007
https://doi.org/10.1109/FREQ.2007.4319182
(can be also found in the EFTF 2007 proceedings)
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