[time-nuts] Leap Second quirk, Another hanging bridge
David Forbes
dforbes at dakotacom.net
Tue Aug 12 20:22:52 UTC 2008
Hal Murray wrote:
> I've got a couple of GPS units that use the SiRF chips feeding NTP. I was
> looking for low cost units for time keeping. They don't work very well. The
> time offset of the NMEA message wanders/jitters by about 100 ms. I can
> easily correct for a constant offset, but I can't dance around an offset that
> won't hold still. (Oh, well. I tried.)
>
I looked into using some US GlobalSat units for my scope clock instead of the
higher-priced GPS 18 LVC. The one I tried has an RS-232 serial port. The manual
refers obliquely to a 1PPS capability, but unfortunately they didn't pin out the
1PPS signal to the board connector. I guess that their market is automotive
navigation or logging, so they didn't consider it worth their while to add the
1PPS signal.
I got the impression that the extra $50 you pay for the Garmin receiver is money
well spent on a well-engineered device.
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