[time-nuts] Phase noise from Allan Deviation ?

Iain Young iain at g7iii.net
Mon Dec 14 09:15:59 UTC 2015


Hi Tom,

On 14/12/15 03:15, You wrote:

> I've constructed a homebrew setup to measure time intervals using a
> software defined radio.  Basically a single-channel downconversion to
> about one hertz, then count samples from the SDR clock to time stamp
> the zero crossings.  This is done in gnuradio and saved to a file for
> post processing. The resolution is theoretically good, but the accuracy
> is unknown.

Very interesting. Would you consider making your flowgraph available ?

I have done similar things with just thresholding and looking for the
start of second (or minute) marker of various distant radio clocks, and
then graphing how far apart they were, as well as feeding NTP.


73s

Iain




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