[time-nuts] Oncore GPS models
brooke at pacific.net
Wed Apr 26 15:23:00 EDT 2006
There's a couple of important differences between the M12+T and the UT+
units and one's the clock speed.
The M12+T has a standard deviation due to the saw tooth error of about 9
ns whereas the UT+ has about 50 ns.
Since there are about 24 GPS satellites in orbit and the Earth blocks
you view of about half of them a 12 channel receiver has a channel
available for each one. But the older UT+ receivers have only 8
channels and so sometimes keep tracking a sat that's much lower in
elevation than another because of lack of channels.
Brooke Clarke, N6GCE
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
Normand Martel wrote:
>F.O.Q. (Full of questions!!!)
>First, is the Oncore UT+ the same unit as the M12+?
>And if not, are there significant differences between
>both units? Briefly, would you suggest me to spend
>more on a M12+ than a UT+ ?? (or let me wait until
>july for the allnew M12M...)
>Also, Randy Warner suggests only versions 2.2 or 3.2.
>What happened between versions 2.2 and 3.0 ? (it looks
>like that there have been major hardware changes...)
>And... Is it easy to reflash one of those units? (do
>we need special hardware, and are reflashing software
>/ firmware easily available on the Net?)
>Finally....On R5122U1112 (version 2.2), how is the 100
>PPS behavior? (if i refer to the PDF file uploaded by
>Randy, a significant correction has been brought to
>the 100 PPS only on the version 3.2 firmware...)
>Thanks and 73 de Normand VE2UM.
>P.S.: Are transactions accepted on this forum? (for
>example, asking anyone if they have GPS boards for
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