[time-nuts] WWV receivers?
attila at kinali.ch
Sat Oct 29 07:49:52 EDT 2016
On Fri, 28 Oct 2016 23:01:52 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:
> nsayer at kfu.com said:
> > That single-chip version is going to have a *LOT* less (and less variable)
> > latency than an SDR.
> Latency isn't an issue as long as it is known so that you can correct for it.
> Has anybody measured the jitter through SDR and/or tried to reduce it? I'd
> expect that even if you counted cycles and such there would still be jitter
> from not being able to reproduce cache misses and interrupts.
Should not be too high. If Jeff Sherman's and Robert Jörden's paper
is any indication, then the jitter should be dominated by the jitter
of the ADC and its reference oscillator. So sub-ps, order of 100fs jitter
should be possible with proper design. Long term drift is another issue
and I have not completely figured out what are the contributors there.
Temperature stabilizing for sure helps, but it doesn't seem to be the
 "Oscillator metrology with software defined radio",
by Jeff Sherman and Robert Jörden, 2016
Any simple idea will be worded in the most complicated way.
More information about the time-nuts