[ntp:questions] PPS signal from Garmin GPS 18x LVC

Steve Kostecke kostecke at ntp.org
Fri Jan 3 13:27:12 UTC 2014


On 2014-01-03, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> On 03/01/2014 10:36, Ralph Aichinger wrote:
>> Steve Kostecke <kostecke at ntp.org> wrote:
>>> In my experience the NMEA driver displays the '*' talley-code even when
>>> PPS is in use.
>>
>> Mine does not:
>>
>> remote       refid   st t when poll reach delay offset jitter
>> =============================================================
>> oGPS_NMEA(0) .NMEA.   0 l   13   16  377  0.000  0.000  0.002
>> +bevtime1.me .ATOM.   1 u    -   64  337 18.300  1.845  0.649
>> *ts2.univie. .PPS.    1 u   48   64  377 12.073  1.952  0.577
>> +ntp.liwest. 131.188. 2 u   26   64  377  8.482  0.554  1.875
>>
>> (ntpd 4.2.6p5)
>
> Yes, it seems to have been an error in some recent development versions, 
> but fixed in 4.2.7p408
>
>    http://bugs.ntp.org/show_bug.cgi?id=2529

For many years I ran a Soekris NET-4801 with a Garmin GPS-18LVC (all of
that hardware is currently in storage). It ran FreeBSD 5.3 and an older
version of NTP.

It _never_ displayed a 'o' for PPS. The only way that you could tell if
PPS was being used was to watch the offset/jitter.

So this is not just an issue with recent development versions.

-- 
Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/



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