[time-nuts] Super stable BVA Quartz resonators... BVA??

Hal Murray hmurray at megapathdsl.net
Sat Dec 8 03:14:36 EST 2007


BNeubig at t-online.de said:

> The key points which yield the BVA's improved aging are, that - the
> whole resonator package is made from quartz, consisting of the
> resonationg quartz plate in the middle section and the two mounting &
> sealing plaates on top and bottem - you may call it a Hamburger style
> ;-) - the resonating plate is held through quartz bridges rather than
> metal  suspensions, thus reducing mounting stress.

Neat.  Thanks.

Why is the top domed?  I assume flat would be easier to manufacture.

Why is it not symmetrical?  If the top is domed, why not the bottom too?



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