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[aprssig] APRS on UHF?

Iain Young, G7III g7iii at g7iii.net
Wed Nov 26 19:20:52 UTC 2008


Patrick wrote:

> GPS time sync is nice, but it doesn't handle when they don't have the same time...  I've
> got a handful of GPS models and some have different time then the others...  All I can
> figure is that the mfr's have taken into account leap seconds in code or something along
> that lines..

Urm, they shouldn't have. Or rather they should let the GPS fleet tell
them the GPS offset from UTC. IIRC, Currently, I think there is 14
seconds difference between GPS and UTC.

If your difference is -not- 14 seconds [maybe 13 with older devices],
then it's something other than leap seconds.

I had this very discussion the other night while out at a works do.
Thing is, if the GPS time is off on the device, I can't see how
the location can be at all accurate.

My guess would be that some devices have a seperate "Real-Time" Clock
on board, and are reporting that time, rather than GPS time.

 From what I understand, the Megallan<SP> models, I know have an issue
with keeping time, at least according to my colleague the other evening.


73s

Iain



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