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.
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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