[time-nuts] Grinding crystals...

[Hal Murray]

nuts at lazygranch.com said:
> A common scheme in metal deposition measurement is to measure the frequency
> of a crystal prior to starting the deposition process, then monitoring the
> frequency shift of the crystal as the metal is sputtered. 

> I was told crystals are tuned this way at the factory, but don't know this
> for a fact. 

I don't have any good references, but I've seen that story several times, and 
at least some of them were credible enough so that my opinion changed from 
sounds-good to really-works.

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Many years ago (50+), I remember stories of grinding or leading crystals.  I 
remember taking one apart.  It was only a few screws.  Does anybody have an 
ARRL handbook from that era?

Does anybody have any estimates on what the performance of a hermetically 
sealed crystal is compared to an old non-sealed mounting?  (Do they still 
make the old non-sealed mounting?)

I also remember getting several crystals cut to order, one each for me and a 
few friends.  That was through the local radio/TV fixit parts store, a block 
or two from the high school.


-- 
These are my opinions.  I hate spam.