[ntp:questions] First attempt GPSD/PPS ->NTP time server

Unruh unruh-spam at physics.ubc.ca
Wed Jan 30 20:07:45 UTC 2008


Rob van der Putten <rob at sput.nl> writes:

>Hi there


>root wrote:

>> No GPS NMEA should not do that. The length of the sentence is almost fixed 
>> length, so the timing on it should vary by perhaps a few msec, as you found, 
>> certainly not by seconds. It sounds like you have troubles. 
>> 
>> You could try using minicom ( assuming you are on Linux) to look at the output
>> on the serial port.

...
>My Garmin was sending to much data, sending a NMEA sentence once per 
>second. So I put '$PGRMO,,4<CR><LF>' in a file and send it to the Garmin.
>Now it's at six lines per second; GPRMC, GPGGA, GPGSA and three GPGSV 
>lines (plus one PGRMT per minute).


This is confusing. You first say that one NMEA sentence pers second is too
much data, and then that youarranged that it sent 6 sentences per second.
Note that only one sentence ( which should take about 140ms at 4800Bd) is
allo you need. 




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