[time-nuts] difference between Oncore M12 and M12+T (useful when buying online)

[paul swed]

Indeed its not easy to tell whats, what either until you paid for it.
I purchased from Fluke.I and my modules is a M12 +. But who knows maybe I
was just lucky.
Regards
Paul
WB8TSL

On Sat, Mar 5, 2011 at 5:15 PM, John Beale <beale at bealecorner.com> wrote:

> In case anyone else is shopping online for a used Motorola Oncore M12+T
> timing GPS, it's probably useful to know what I just learned:
>
> Some online sellers offering "M12+T 100 pps GPS" may instead send you a M12
> Navigation (non-timing) GPS. The differences:
>
> Motorola Oncore M12 Navigation GPS:
> ---
> * Supports Motorola Binary and NMEA output
> * does not have 100 Hz output
> * does not have TRAIM (Timing Receiver Autonomous Integrity Monitor)
> * does not have sawtooth correction output
> * 1 PPS <500 ns timing
>
> crystal nearest MMCX antenna connector is two-lead can style with bent
> leads for surface mounting
> example p/n label: P183T12N12   (final "N" = "Navigation"?)
>
> photos:
> http://www.wa5rrn.com/GPS%20Other/Motorola%20M12/m12.pdf
> https://picasaweb.google.com/bealevideo/GPS#5580118907079326290
>
> Motorola Oncore M12+T Timing GPS:
> ---
> * Supports Motorola Binary output only
> * 1 Hz or 100 Hz output selectable
> * TRAIM (Timing Receiver Autonomous Integrity Monitor)
> * sawtooth correction ("clock granularity") message available
> * 1 pps <2nS 1 Sigma, <6nS 6 Sigma (using sawtooth correction message)
> * 1 pps <10nS 1 Sigma, <20nS 6 Sigma (without correction)
>
> smaller leadless surface-mount crystals
> example p/n label: P283T12T17    (final "T" = "Timing"?)
>
> photos:
> http://www.wa5rrn.com/GPS%20Other/Motorola%20M12/m12plusbrochure.pdf
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?VISuperSize&item=290308535362
>
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