[time-nuts] Orbiting crystals
SAIDJACK at aol.com
SAIDJACK at aol.com
Sat Jun 27 04:46:30 UTC 2009
Hi Antonio,
not an expert on space qualified crystals, but I would think that in
general Cesium and Rubidium crystals would be steered very quickly (within
seconds?) to correct for any crystal jumps that surely will happen even, or
especially in space.
In a GPSDO, we generally only have one correction pulse per second from the
GPS, and that one is even noisy and needs to be filtered. In an atomic
clock, we can steer the crystal without this 1Hz limit.
A good gps receiver will use over-determination and not use a single sat to
generate the 1PPS. And even then a GPS 1PPS is expected to be noisy.
Bye,
Said
In a message dated 6/26/2009 16:26:22 Pacific Daylight Time,
iovane at inwind.it writes:
this post wouldn't be merely speculative, I have an actual
interest in knowing if what I'm going to ask is possible.
As it has already been discussed here, crystals may jump in
frequency. If I recall, about 20% of good quality crystals are
prone to jumping, but a crystal that used to jump might not
jump anymore, a crystal that never jumped might jump in the
future, and so on.
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