I`m not sure that questions like these is welcome on this list, but here goes 
anyway :

1/ What are the the 10 sources of the most constant [invariant] frequencies known to man, in order of decreacing constancy? Four immediately come to mind.

2/ What is the mechanism in an oscillator, that is responsible for phase noise? 
[In only one sentence please]
If this is known, then it becomes easier to design low phase noise oscillators.

I hope you enjoy these questions,.................................Don.

Don,

See http://www.leapsecond.com/ten/
and http://www.leapsecond.com/ten/clock-powers-of-ten-tvb.pdf

/tvb


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