[ntp:questions] SVeeSix via USB on Linux?

Steve Kostecke kostecke at ntp.org
Tue Aug 7 12:39:32 UTC 2007


On 2007-08-07, Hal Murray <hal-usenet at ip-64-139-1-69.sjc.megapath.net> wrote:

>"Harlan Stenn" wrote:
>
>>I believe NMEA is pretty much useless without a PPS signal.
>
> NMEA works without a PPS. It just doesn't work as well as people would
> like. I'd expect offsets in the tens of milliseconds range rather than
> microseconds. I don't have any data to back that up but I can get it
> if it will help.

NMEA sentences are emitted when ever the receiver is able to get around
to it (i.e. some where within each second).

The PPS (Pulse Per Second) signal is emitted at the top of each second,
usually within a few micro-seconds of UTC.

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




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