On 1/15/22 8:30 AM, Bob kb8tq wrote:
Hi
Ummm ….. errrr ….. somebody … errr … got you a deal on
those parts … errr ….
Bob
Indeed. But they were also, I think, some of the first 100MHz
versions. $400 each, in 2015. They worked just fine.
Same mission we had the CSAC on (one goal was to compare CSAC, GPS, and
EX-421.. as it happens, our temperatures were pretty stable, so it's not
exactly a challenging test - as I recall, over the 6 months of data,
there was no real change in frequency of either CSAC or OCXO compared
against GPS, and the GPS was a simple Novatel OEM widget, so no ball of
fire time-nuts wise)
On Jan 15, 2022, at 10:01 AM, Lux, Jim <[email protected]> wrote:
On 1/14/22 3:40 PM, Bob kb8tq wrote:
Hi
The design traces back to the Efratom “EMXO” from the 1980’s.
Vectron bought the rights to that design and produced examples
of it for about a decade or so.
Bob
I flew a 100MHz EX-421 in space on a cubesat - same series of tiny OCXOs -
except the EX421 is a bit smaller foot print and taller. it's about the size of
a US sugar cube (13x13 mm and 10mm tall). Low power for an OCXO, and small,
both of which were important. And the phase noise was decent. They weren't too
expensive (a few hundred $ each, as I recall - non space grade).
<EX-421.pdf><PNoise_EX-421-100MHz.pdf>_______________________________________________
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