Le 06/08/2012 00:01, Bob Camp a écrit :
Hi
The part at the link does not appear to have a holdover specification. You
probably would do better with a TBolt off of eBay.
Agreed.
I took a look at the Axtal AXIOM40 data sheet and they are quoting 200
ppb per YEAR aging.. That's not bad; so if the device is only affected
by that in holdover, it's only 200ns slow out at the end of a year ... I
doubt that my T-Bolt could do as well. So as to providing a stable
frequency it looks fine. HOWEVER that particular device has1PPS on the
DCD line FROM the GPS receiver and not disciplined by the OCXO, so the
advantage is lost and the PPS will drift at the receivers onboard
crystal aging rate while not getting updates from GPS. So it's not a
good choice. Better to get a device with PPS disciplined directly by the
main oscillator and aligned to UTC when the signal is available as in a
T-Bolt.
--
Les chiens aboient, et la caravane passe.
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