[time-nuts] nubie querie

[Richard (Rick) Karlquist]

> 
> For a simple crystal oscillator the two word answer might be "Leeson's model".  That of course is a cop out since it clearly defines multiple things that contribute to phase noise. 
> 
> Bob

And Leeson's model is basically the same as Edson's model, circa 1950
(Edson:  Vacuum Tube Oscillators) with 1/f noise added.  However, 
crystals have "excess noise" above and beyond simple thermal noise. 
There is no model, you just have to characterize the crystal.

Rick Karlquist N6RK