Nero Imhard <[EMAIL PROTECTED]> writes: >David J Taylor schreef:
>> The fact that you have a 0.2s offset suggests you are synching to the >> trailing edge of the PPS signal and not the leading edge. >The NMEA output would be my prime suspect. It is not surprising to have >an offset there. The time in an NMEA sentence doesn't tell you what time >it is "now", but instead it specifies the point in time that the rest of >the data (e.g. position) refers to. Also, NMEA sentences lack proper >time markers. It's always tricky business to get clock synchronization >from NMEA alone. I would say it is impossible. >The Garmin GPS 18 LVC manual explicitly mentions that emitted NMEA >sentence describe the when and where of the *previous* rising edge of >the PPS signal. It does not specify how long after that edge it will >give you the NMEA, or even that this time will be constant. It cannot tell you since that depends completely on how you have set it up-- ie how many sentences it delivers. As mentioned if it is only the one sentence, then 180msec is not a bad estimate at 4800bd. Ie, the unit just sends out the sentences as soon as the second has occured. >N _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions