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

[Brian Styles]

Didier Juges wrote:

  Maybe the cut is simply a smoke screen and the outstanding performance
  is actually due to other process detail(s) not disclosed?

There's quite a bit of guff on the Oscilloquartz website - especially 
if you find your way to the OXCO 8607-B datasheet (pdf).

I'm not qualified to weigh this all up, but they point out a double oven 
and an electrodeless, SC-cut, 3rd overtone crystal, decoupled from its 
mounting structure by four rigid bridges. And they go on to list the 
consquent benefits.

They've made over 10,000 of them. Anyone know what they're charging...?

Yours,



-Brian Styles


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

[Brian Styles]

John Ackermann N8UR wrote:

 The option -008, ...  is about $14K. I'm told the yield
 of those is about a dozen per year, and the lead time to get one is
 around six months.

Hmm, not quite long enough to save up, then!

Changing the subject slightly, does anyone know the Thomson-CSF
PMT P5-1E ?

It seems to offer a total stability of 5x10e-11 over a day and 1x10e-8 
over 12 months. The latter figure isn't very far behind the best 8607.

I ask because I've had one of these Thomson trinkets kicking around for 
a while (washed up from an abandoned project) and thought of building a 
clock round it. My own obsession is with long-term accuracy rather than 
the immediate spectrum. It has to beat the Synchronomes...

If anyone's played with a PMT P5-1E, I'd be most interested to hear.

Regards,


-Brian Styles

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