[time-nuts] Oscillators and Ovens
hmurray at megapathdsl.net
Wed Nov 1 16:38:55 EDT 2017
> In general, OCXOs have crystals with high Q -> low phase noise, especially
> compared to a TCXO, which *can't* have high Q, or the temperature
> compensation circuit can't do it's work.
I don't understand that. Why can't I build a high Q TCXO? I don't need to
change the compensation very fast. Are good crystals high enough Q that it
would take too long?
What's the time constant? I'd guess it's Q/freq, maybe with factors of 2pi
or e or ???
That seems small relative to how fast temperature changes. (but maybe fast
relative to FCC smearing or things like that)
These are my opinions. I hate spam.
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