[ntp:questions] SIRF time output wobble, GPS or NTP fault?
unruh at invalid.ca
Tue Mar 6 19:03:10 UTC 2012
On 2012-03-06, David J Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> Hi all,
>> I've been seeing some very strange behavior from my USB BU-353 GPS based
>> on readings from the Meinberg Server Monitor. The unit is based on the
>> SIRF Star III e/LP chipset. At first, I thought it was the GPS at
>> fault. But, now, I'm not so sure that it's not either NTP or the
>> Meinberg monitor program. Let me explain.
>> Sincerely (confused),
> Sorry to be blunt, but please stop using serial NMEA output and expecting
> good results! If you see similar problems with PPS to the DCD pin of an
> RS-232 port, please report them.
Since a 1 second error in nmea would also impact the PPS output, his
observation is far from irrelevant. That was what happened with the
Garmin 18x-- the nmea offset became greater than a second, and all hell
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