On 10/5/2011 6:51 AM, alexandros kampolis wrote:
Most (if not all) use a GPS receiver as a precision time source. This
includes the NMEA messages and the 1 PPS output.
The question is: can i use the GPS receiver configuration but replace
the receiver with a precision 1 PPS source? I have a quartz frequency
standard that is able to output 1 PPS pulses and i want to use this
instead of the GPS receiver (which i do not have).
I'm asking this because i do not know if ntpd requires both the NMEA
messages and the 1 PPS pulses to work correct (or to work at all).
The PPS signal defines the start of a second. It does NOT tell you
which second that is. NMEA messages tell you which second: "At the
chime, the correct time. . . ." Check the documentation for your
"clock" to learn how it announces the start of a second and which second
that is. Check also which edge of the pulse, rising or falling,
marks the second. Either one may be used but ONLY ONE marks the start
of a second.
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