[time-nuts] difference between Oncore M12 and M12+T (useful when buying online)
Rick Hambly (W2GPS)
w2gps at cnssys.com
Wed Mar 9 19:04:57 UTC 2011
Every now and then I see e-mails like these. I would like to remind everyone that Synergy Systems, the USA distributor for the M12 series receivers, offers Ham Radio and Educational (time nuts) users a new M12M with the precision time firmware and an on board battery for only $59.18 with the 10% Ham/Edu discount (sown from $65.75). This unit also includes both Motorola binary and NMEA message formats.
Synergy can be found at www.synergy-gps.com or at (858) 566-0666. They have been very good to the Ham and educational communities for many years.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of paul swed
Sent: Saturday, March 05, 2011 3:06 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] difference between Oncore M12 and M12+T (useful
when buying online)
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.
On Sat, Mar 5, 2011 at 5:15 PM, John Beale <beale at bealecorner.com>
> 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"?)
> 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"?)
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