Has anyone compared the M12M to the M12+? Thanks for all the input, it is really appreciated. best wishes; Thomas Knox
> CC: [email protected] > From: [email protected] > Date: Fri, 30 Mar 2012 09:53:17 -0700 > To: [email protected] > Subject: Re: [time-nuts] CW12-TIM vs M12M and the world > > Hello Ed, Azelio, > > We should also compare the same parameters. Sawtooth error of the m12+ of > +/-25ns is not its standard deviation, it's max/min. Compare that number to > your 30ns max/min measurement on the 5372a. > > Standard deviation of the m12+ is around 2ns with correction. That needs to > be compared to the 5ns you measure on the 5372a as that is the best > performance you will get from the CW12. Yes the uncorrected 1pps of the m12 > is worse, but it is designed to be used with correction. So in the end the > m12m still performs better than the CW12. > > Bye, > Said > > Sent From iPhone > > On Mar 29, 2012, at 1:56, Azelio Boriani <[email protected]> wrote: > > > We (that is my company) use the CW12-TIM (NMEA version) and its PPS wonders > > as usual, nothing different from a uBlox LEA-5T or the M12M. > > > > On Thu, Mar 29, 2012 at 9:32 AM, Hal Murray <[email protected]> wrote: > > > >> > >>>> The sawtooth error on the Motorola M12+ is about +/- 25ns, while the > >>>> CW12-TIM has a sawtooth error of +/- 2 ns, so correcting for the > >>>> sawtooth error is not as critical with the CW12-TIM. > >> > >>> The first claim > >>>> The sawtooth error on the Motorola M12+ is about +/- 25ns > >>> is correct but are you absolutely sure that the second claim is correct > >>> too????? > >> > >>> It would mean a factor >10 improvement of the CW12-TIM against the M12 > >> which > >>> is hardly believeable. > >> > >> The 25 ns probably comes from period of the the free running clock they are > >> using. It doesn't seem unreasonable to me to get 10x better if they use a > >> GPSDO for the local clock so they can get the PPS edge right where they > >> want > >> it. > >> > >> > >> > >> -- > >> These are my opinions, not necessarily my employer's. I hate spam. > >> > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
