[time-nuts] Discussion of precise time and frequency measurement

Hal Murray hmurray at megapathdsl.net
Thu Jun 30 07:54:58 UTC 2011

tvb at LeapSecond.com said:
> Either use the PC to timestamp receive buffers, or if you have a 1pps handy,
> just feed your 60 Hz signal into one channel (L) and the 1 PPS into the
> other (R). 

If you have a known-good (accurate?) signal going into you audio channel, you 
can compute the actual clock frequency of the audio capture path.

I think the IRIG driver in ntpd does that, and includes the offset in PPM in 
the log files.

These are my opinions, not necessarily my employer's.  I hate spam.

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