Hi,Thank you very much, this paper answered some questions.
On Wednesday, June 8, 2022 at 12:38:04 PM PDT, Hans-Georg Lehnard via
time-nuts <[email protected]> wrote:
Hi,
read this paper from Connor-Winfield about differences AT/SC cuts.
http://www.conwin.com/pdfs/at_or_sc_for_ocxo.pdf
Am 2022-06-08 04:04, schrieb Ross P via time-nuts:
> Hello,My first post.I have created a 64-bit frequency counter, 15.9 digits
> after converting to floating point.
> Oscillator random walk is +- 0.01 ppm with an SC cut crystal at 10 Hz
> filtered, and 0.1 ppm with at cut.Is it the crystal or the oscillator
> electronics (inside a can) that determines the noise?The oscillators I am
> using are 1 double oven SC 10 MHz vs 1 single oven AT cut 10 MHz in one
> test,and 2 generic crystal oscillators (on a Terasic DE1 cyclone II FPGA
> board) for the other test.I assume the single oven oscillator will have
> better stability than commodity oscillators.I am able to chart random walk at
> up to a few thousand samples per second at full double precisionresolution,
> and FFT shows some alien tones in the walk pattern that come and go suddenly,
> I thinkdue to oscillating mode changes in the oscillator itself, mostly show
> in the commodity crystals.My question is: is the SC quartz the most stable
> for random walk.I would like to know if such a frequency counter / alien to
> detector is useful enough to be producedfor sale? It would require at least 3
> separate frequencies of
refer
> ence time standards and > 50Klogic elements in the FPGA for 3 cross coupled
> monitors to cover a range of 0 to 50 MHz.
> Quite a risk if no one needs it. 3 separate high stability reference
> oscillators are expensive.rp
>
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