On Thu, 21 Nov 2013 09:40:44 -0500, time-nuts-requ...@febo.com wrote: time-nuts Digest, Vol 112, Issue 65 > > Message: 8 > Date: Thu, 21 Nov 2013 06:40:14 -0800 > From: "Tom Van Baak" <t...@leapsecond.com> > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Subject: Re: [time-nuts] Strange 100ns jumps on Motorola M12+T > Message-ID: <81E050E96BC946FEAC01752F44CE988D@pc52> > Content-Type: text/plain; charset="iso-8859-1" > >> The 100ns is exactly one cycle at 10 MHz. GPS receivers use this, or >> something very close, as an internal clock. > > Joe, > > The vintage Oncore VP used a 9.54 MHz clock (which is why its > sawtooth is about +/- 52 ns). > > Stephan is using the newer M12+T (~40 MHz clock, which is why its > sawtooth is about +/- 13 ns). > > A 100.0 ns offset is more likely something to do with 10.00 MHz, > which is why I suspect connections and settings of the 53131A counter. > > /tvb
Could be. I don't completely visualize the setup, but given the noise shown in the plot, could we reliably tell 100ns from 105ns? Joe Gwinn _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
