[time-nuts] questions about oscilloquartz 10MHz module

[Magnus Danielson]

Hi Nigel,

I was about to make a similar comment. The 8663 is for sure limited by
it's size. Actually, for being Oscilloquartz they are by far not the
best or the worst, but kind of mid-range. I have OSA 8712 here, and the
even smaller one. Then there is the OSA 8666/8667 and well, I guess the
OSA 8600/8607 does not need introduction. I do not have the full OSA
range of oscillators for sure, but a fair sampling of it.

I think we should look at the 8663 for what it intends to be, a
mid-range OCXO to address some of the telecom market needs.

Cheers,
Magnus

On 2020-02-02 23:37, gandalfg8--- via time-nuts wrote:
> 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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