[time-nuts] xtal oscillator phase noise

[Bruce Griffiths]

Don Collie wrote:
> Bruce, do you get out much?................Don.
> ----- Original Message ----- 
>   
Don

I do give at least one public talk a month.
Also have done such things as attempting to measure the wavefont
distortion of a telescope using very little equipment.
The oft sited eyeball star testing techniques arent very effective with
larger telescopes when the seeing is poor (most of the time in Kirikiriroa).
Those that say you can Ronchi test or Foucault test a telescope on the
stars by eye are dreaming, an exposure of 30 sec or more is usually
necessary to average out the effects of air currents etc.
Have also found that the interferometric version of the Hartmann test is
easy and relatively inexpensive to do.

I also do some optical design for a diversion.

Bruce