[time-nuts] NMEA time off

Murray Greenman Murray.Greenman at rakon.com
Thu Mar 3 17:45:32 UTC 2011


Many older GPS units sending NMEA at 4800 baud will in effect indicate
one second slow, either all the time or some of the time, if there are
too many GPS sentences turned on. There's too much data in the queue.
Either drop the number of sentences enabled, or increase the baud rate,
or both.

Another source of delay is the computer. It may take up to a second for
the serial data to get to the screen from the com port. Try a different
computer and/or terminal program.

The best source of time is of course the 1pps pulse, but you still need
to know which UTC second each one refers to!

73,
Murray ZL1BPU





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