On 8/15/09 2:32 PM, "Rick Karlquist" <rich...@karlquist.com> wrote:
> Robert Darlington wrote:
>> not 980kHz, not 1.2Mhz. The way I achieve this is to lay down gold, a few
>> atoms at a time, and track a resonance peak (network analyzer and some
>> simple code in VB of all things). We actually drive the transducer as we
>> sputter coat the gold on top and can see the resonance point shift, real
>> time. Cool stuff. They use a similar process in industry but they're
>> looking at one data point in a vacuum chamber full of transducers. I'm
>> looking at every single one.
>>
>> -Bob
>
> The 10811 crystals were made this way. One at a time, they were
> coated with gold while connected to a network analyzer.
>
>
Ditto for the crystals used in Ultra Stable Oscillators. The real art,
though, is in picking the right frequency to go to, so that after you've
going through the initial aging, it's right on where you want. Very much a
build 20 to get 1 good one sort of process.
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