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| + | ==== Differences between Oncore M12 and M12+T (useful when buying online) ==== | ||
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| + | //From the [time-nuts] mailing list// | ||
| + | |||
| + | ---- | ||
| + | \\ | ||
| + | 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: | ||
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| + | * 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 | ||
| + | |||
| + | John Beale | ||
| + | |||
| + | ---- | ||
| + | \\ | ||
| + | Just for reference, these are the variant numbers I have for the M12+... | ||
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| + | * Timer ----------No Battery ----- P273T12T1x | ||
| + | * Timer --------- With Battery -- P283T12T1x | ||
| + | * Navigation -- No Battery ----- P273T12N1x | ||
| + | * Navigation -- With Battery -- P283T12N1x | ||
| + | |||
| + | regards | ||
| + | |||
| + | Nigel\\ | ||
| + | GM8PZR | ||