[ntp:questions] what happens when sys.peer turns stratum 16?

Miroslav Lichvar mlichvar at redhat.com
Wed Jun 2 10:34:10 UTC 2010

On 2010-06-02, David J Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>>>The Motorola Oncore UT GPS receiver, which was designed as a precision
>>>time source, has a T-RAIM (time receiver autonomous integrity
>>>feature which, properly configured, switches off the PPS output if
>>>the receiver loses lock.
>> But lots of low-cost GPS receivers don't do that.
> .. including the popular GPS18 LVC.  So it's better to have a driver which 
> reads the serial output of the GPS to confirm lock.

GPS18(x) LVC supports a PPS auto off mode which can be enabled with
"$PGRMC1,,,,,,,,,,,,,2" command.

Miroslav Lichvar

More information about the questions mailing list