Re: oscillator design with a long xtal lead

Joerg wrote:

Hello Phil,


High and ultrahigh vacuum is a world to itself, and the rules are really different. I don't know what sort of vacuum the OP is contemplating, but if it's below 10**-6 torr, the cable idea is the right one. You can get low-outgassing cable, usually polyimide-insulated, with no jacket. Cables like that (and water-cooled holders for quartz oscillator crystals) are common throwaway vacuum system parts.

The circuit board is going to be the big killer. Also lots of vacuum systems need to be baked out at > 200C for hours and hours, which would get flux and various FR-4 exhalations all over *everything*. You could probably do this, e.g. on a sintered alumina substrate, but it wouldn't be a slam dunk, and you'd have to make it cleanable--really cleanable.


Ok then, here is another idea: Create a low end impedance analyzer on the outside and instead of oscillating monitor the crystal parameters. With clever software it should be possible to compensate for the cable characteristics and their changes with temperature.

Joerg,
the whole is a an impedance analyzer, not a low
end one though, as the changes to be measures are
minute. And the changes are biggest when the oscillator
oscillates.

Rene
.

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