David J Taylor wrote:
- thanks for the notes on the GPS 18 LVC. Mine wasn't set like yours, and by chance I got the version with the longer 5m lead.
Yes mine has a 5m lead too which is handy.
- kernel recompile took 5 hours on this 133MHz/48MB system
Ouch!
- without the kernel recompile (as I understand), the PPS line looks just like another Internet source, so the jitter might be milliseconds rather than microseconds. You /have/ to do the recompile for best accuracy.
Compile finished, but it doesn't seem to have improved unfortunately :( This GPS is *really* innacurate...
xGPS_NMEA(0) GPS_NMEA(0) 15 l 25 64 377 0.000 -215.79 10.321
- you /did/ wire the PPS to the DCD pin, and not somewhere else? Even a multimeter should show the signal (well, an analog one might). IIRC, the GPS delivers the PPS signal even if it's not position locked.
Yes.
- the pulse is nominally 200ms long, so if you have the "wrong" number of inverters between the GPS and the RS-232 connector, you may observe a 200ms offset, and you may need to tell NTP to lock onto the other edge.
Not sure what that means.. :) I connected it up as per the instructions on the google article I linked to.
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