"Edward T. Mischanko" wrote in message
news:ivk80m$4uh$1...@speranza.aioe.org...
I am using GPS with PPS as my primary time source. I don't want to set
my back-up network servers to minpoll 10 in the configuration because if
the GPS ever fails the servers would be fixed at minpoll 10. I propo
"Michael Eder" wrote in message
news:000c01cc408b$6699f7a0$33cde6e0$@whoi.edu...
Hi Folks,
For our buoy deployments we have GPS and a highly accurate oscillator
conditioned by the GPS PPS. Unfortunately when we let this run for
longer
periods we see both the GPS and PPS being marked as false
Again we are talking effectively what happens. There is a good deal of
logic what to do if the NMEA and/or pps does not come in and if the system
clock is significantly different from either the NMEA or pps. A whole day
on the lab bench with a scope on both the pps and the NMEA these never
happen
On 2011-07-15, Michael Eder wrote:
> Again we are talking effectively what happens. There is a good deal of
> logic what to do if the NMEA and/or pps does not come in and if the system
> clock is significantly different from either the NMEA or pps. A whole day
> on the lab bench with a scope on
Michael Eder wrote:
Again we are talking effectively what happens. There is a good deal of
logic what to do if the NMEA and/or pps does not come in and if the system
clock is significantly different from either the NMEA or pps. A whole day
on the lab bench with a scope on both the pps and the N
David,
Something like this was done in NTPv3 (xntpd) and it turned out to be a
bad idea. The poll interval is determined by the time constant, which
for PPS and other low-stratum sources is relatively small. If a backup
is switched in at a poll interval much larger than this, it takes awhile
On 2011-07-15, David Lord wrote:
> Michael Eder wrote:
>> Again we are talking effectively what happens. There is a good deal of
>> logic what to do if the NMEA and/or pps does not come in and if the system
>> clock is significantly different from either the NMEA or pps. A whole day
>> on the la
David,
Something like this was done in NTPv3 (xntpd) and it turned out to be a
bad idea. The poll interval is determined by the time constant, which
for PPS and other low-stratum sources is relatively small. If a backup
is switched in at a poll interval much larger than this, it takes awhile
unruh wrote:
On 2011-07-15, David Lord wrote:
Michael Eder wrote:
Again we are talking effectively what happens. There is a good deal of
logic what to do if the NMEA and/or pps does not come in and if the system
clock is significantly different from either the NMEA or pps. A whole day
on the
I think we are saying the same thing. When the PPS comes in the NMEA value
in SHM is that of the previous second.
What works great is just the PPS alone (configure only one clock in
ntp.conf) and that may be the solution. We can lose GPS but never PPS and
we condition the PPS time with the NMEA
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