[ntp:questions] SIRF time output wobble, GPS or NTP fault?

David J Taylor david-taylor at blueyonder.co.uk.invalid
Wed Mar 7 09:33:13 UTC 2012


"Rob" <nomail at example.com> wrote in message 
news:slrnjle8la.jm4.nomail at xs8.xs4all.nl...
> David J Taylor <> wrote:
>>> Are there any NMEA GPS that are designed for timing? Maybe - but I
>>> can't think of one right now.
>>
>> GPS 18x LVC has both NMEA and PPS.  Is it "designed for timing" in that
>> case?  Perhaps not, as it doesn't have the sawtooth data which some
>> devices offer.  Is its 1 microsecond accuracy good enough?  Plenty good
>> enough for most NTP uses, I think.
>
> Doesn't it support some "Garmin binary mode" that is more closely 
> specified?

Yes, there is Garmin binary according to the manual here, Rob:

  http://www8.garmin.com/manuals/GPS18x_TechnicalSpecifications.pdf

That seems to indicate that the binary data isn't sent until all 
post-processing has been done, but I have no knowledge or experience with 
that mode.

Chhers,
David 



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