[Elecraft] Rb & GPS DO comparison

[Tony Estep]

On Wed, Jul 20, 2011 at 7:08 PM, Igor Kosvin <k.igor at comcast.net> wrote:

> ...aging drift - better than 1e-11 per month. Useful life of LPRO - usually
> 15 years.
> Make your math how much it drifts over life....

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An interesting question. If the drift is always in the same direction, you
get the (apparently) obvious answer. If, at the other extreme, each month's
drift is independent of the previous month's, then the expected frequency at
the end will be described by a Gaussian distribution with mean = the
starting point, and standard deviation scaled by the square root of the
number of months. In practice, one would expect some serial correlation
between monthly drifts, so a bias would be added to the expected mean.

Tony KT0NY