[ntp:questions] Re: May ntp be off by a second in case of GPSsource?

Thomas Laus lausts at acm.org
Sat Dec 31 15:41:12 UTC 2005


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On 2005-12-30, Bjorn Gabrielsson <bg at lysator.liu.se> wrote:
> hmurray at suespammers.org (Hal Murray) writes:
>
> PPS pulse yes. But still the serial port message is usually sent after
> the pulse. On some receivers the NMEA message is unpredictable - the
> jupiter receiver I have is either 1 or 2 seconds late in _NMEA_
> mode. Binary mode for the jupiter is flawless. 
>
The same is true for the Motorola Oncore receivers.  The usual word of
advice is to get a GPS receiver optimized for timing if you plan to use
if for timing and one optimized for positioning if the planned use is
for finding ones position.  The binary mode for the NTP reference clock
receivers will provide much better performance than using the same
receiver in NMEA mode.

Tom

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