The FTDI using CTS is showing a 1mS at most jitter with my venus 638 pps
signal in my userland tests.  The start bit offset is worse but the jitter
seems similar.
On Mar 14, 2012 12:32 AM, "Eric S. Raymond" <esr@thyrsus.com> wrote:

> Dave Taht <dave.taht@gmail.com>:
> > So < 5ms would be the outside goal, and anything less than that - so
> > long as it can be thoroughly catagorized - is a bonus.
>
> Yeah, that's *exactly* how I figure it, too, Nyquist's Theorem and all.
> I set 1ms as a goal because the ZTI dongle does that and I think I
> know how (jacking USB polling frequency to max), but you're right - for the
> delay tomography we can live with anything < 5ms.
> --
>                <a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
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