Hi Tom:
The plot at http://www.thinksrs.com/products/PRS10.htm showing GPS and
Rb indicates that GPS for times less than say 500 seconds has more noise
than the Rb source. So a voltage ramped 1000B should be very clean
below 500 seconds.
Have Fun,
Brooke
Tom Van Baak wrote:
I was thinking of using a Datum 1000B Ultra Stable Oscillator (the one
used in the FTS 4060 Cesium standard). The data sheet says that after a
few years the aging rate gets down to parts in E-12/day. I would think
that the Allan plot would be cleaner if the control voltage was well
behaved than if it was derived from a noisy process like GPS or maybe
Cesium.
The 1000B makes a good standalone standard.
What tau range of the Allan plot were you thinking
of making cleaner?
Note that frequency standards like the HP 105B
use a very clean control voltage: a 10k pot.
/tvb
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