[time-nuts] NTP, PPS and < 10 us offsets

[mike cook]

Le 15 mai 2013 à 21:43, Miguel Barbosa Gonçalves a écrit :
> 
> I've reconfigured the antenna to output only NMEA sentences (and I also use
> the PPS) and NTP works fine but suddenly without any explanation the NTP
> process stops receiving information from the receiver. I really don't
> understand what's happening here as the receiver is on the roof and sees
> plenty of satellites:
> 
> 56427 70907.634 127.127.20.0
> $GPGGA,194147.0,4055.227,N,00829.618,W,1,07,1.14,00264,M,051,M,,*48

these look ok

> 56427 70923.635 127.127.20.0
> $GPGGA,194203.0,4055.227,N,00829.617,W,1,07,1.14,00262,M,051,M,,*42
> 56427 70939.634 127.127.20.0
> $GPGGA,194219.0,4055.226,N,00829.616,W,1,06,1.47,00258,M,051,M,,*47

The NMEA driver is very stable so my guess would be the 422/232 converter. As you have 2 converters you could try switching them to see if the problem moves.