[time-nuts] tcxo

[folkert]

> I'm experimenting a bit with time keeping.
> For that I use cheap low power hardware like raspberry pies and
> arduinos.

Hi people,

Thanks for all the replies! Took a bit to respond but I had the flu.

My objective is, to get the best precision/accuracy possible with said
hardware.

The first step is preparing an arduino. I found one that has an easy to
desolder crystal:
http://upload.wikimedia.org/wikipedia/commons/thumb/0/04/Arduino_Mini.jpg/170px-Arduino_Mini.jpg
Bought a couple of those and some of these:
http://www.aliexpress.com/item/Precision-TCXO-square-wave-oscillator-TCXO-16-9344MHz-line-rectangle/1104200137.html

While waiting for these and the parts for the schematics, I'm toying
around with implementing ntp servers (well, sntp) for arduino. With
lots of blinkenlights of course and with ethernet. Not trivial I can
say.
This is the jitter plot of a test where time is fed from an RTC module.
I did not plot the drift but it is +/- 120 seconds in the 3.8 days I
measured it.
http://vps001.vanheusden.com/~folkert/aRTC.png


Folkert van Heusden

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