[time-nuts] Q/noise of Earth as an oscillator

David davidwhess at gmail.com
Wed Jul 27 10:10:20 EDT 2016


We have discussed quartz crystals which despite their high Q, may
suffer from periodic "jumps" in frequency do to what I assume are
imperfection that hardly affect Q.  If they did affect Q, then that
would have been a good way to grade them for this behavior.

Temperature coefficient is also independent of Q.  If I built a
pendulum out of a material with a high thermal coefficient of
expansion, it will not be very stable but the Q will be unaffected.

On Wed, 27 Jul 2016 22:43:04 +1000, you wrote:

>On Wed, Jul 27, 2016 at 8:08 AM, Attila Kinali <attila at kinali.ch> wrote:
>
>...
>
>Something else that indicates that the model is suspect is that the
>apparently high 'Q' implies a stability which the earth does not have,
>as Tom observes. Viewed another way, this suggests that the model is
>inappropriate because it leads to an incorrect conclusion.
>
>Time for bed. I'll probably lie awake thinking about this now :-)
>
>Cheers
>Michael


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