[time-nuts] Improving the stability of crystal oscillators
donmer at woosh.co.nz
Mon Oct 15 21:31:14 EDT 2007
I was thinking of attaching a temparature sensor [AKA Star Treck] to the
cold side of a Peltier [what`s the other type? Are they available/better?]
pile. and driving the pile from the output of some sort of servo loop to
maintain a temparature of ,say , 0 Degree C.
If you wanted a double oven, you could heatsink a small oven,
containing the crystal, the oscillator, and buffer[s] to this, and use a
second servo loop to raise the temparature of this to 25 Degrees C working
against the Peltier. In this way, you could maintain the crystal, and
circuitry at 25 Deg C., over an ambient temparature of 0 to ,say 70 Deg C.
Yes, you can cut a crystal to have an inversion temp at 25Deg C. [well
certainly with an AT cut - I`m not sure about the SC cut.]
----- Original Message -----
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, October 16, 2007 5:49 AM
Subject: Re: [time-nuts] Improving the stability of crystal oscillators
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+donmer=woosh.co.nz at febo.com RETRY
>> The resonator inversion temperature occurs at 70-80 degrees Celsius,
>> depending on the cut angles.
> Is there something magic about quartz that has a turnover in the region
> just happens to be handy for OCXOs? Or is it the other way around: people
> chose the cut angle to get a temperature that works well for ovens?
> Could I cut a crystal with a temperature at (say) 0C or something handy
> These are my opinions, not necessarily my employer's. I hate spam.
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