[time-nuts] Frequency referenced temperature regulator

Oz-in-DFW lists at ozindfw.net
Mon Nov 8 15:17:50 UTC 2010



On 11/8/2010 9:04 AM, Poul-Henning Kamp wrote:
> But since I happen to have access to much more stable frequencies
> than voltages, I thought of a different way:
>
> 1. Mount a X-tal-osc with really lousy tempco inside the enclosure.
>
> 2. Compare its output to a stable reference frequency.
>
> 3. Use the output of the phase comparator to drive the Peltier.
>
> It is basically a PLL where temperature is used as EFC...
>
> Has anybody tried that ?
It's been my experience that oscillators with really lousy temperature
performance have really lousy repeatability as well.   I'm never delved
into why this is true, but I suspect it's a number of things and not
limited to the quartz resonator.

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