On Wed, 14 Aug 2002, Mike Singer wrote:

>Harold M Hallikainen wrote:
>> Also, remember that setting a 12 MHz oscillator to
>> within 1 Hz means it isn't going to stay there.
>> That's 0.1 ppm. Really good crystal oscillators
>> (with temperature compensation or ovens) can maybe
>> do 1 ppm or so.
>
>Yes, from Electronicstalk.com:
>
>"The FTS501AH OCXO offers a frequency stability of
>+/-250ppb over the standard temperature range of 0 to 70C"
>
>(ppb = 1000 ppm ?)

Yes, billion = 1e9

The only small problem is price. Fox TCXOs were around $40 when I last
checked and the spec was worse than 0.25ppm.

Peter

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