On Mon, Jan 30, 2012 at 10:43 AM, Mark Sims <hol...@hotmail.com> wrote: > > These are 4-BYTE single precision floating point numbers, not 4 bit > integers. They are the values plotted in the Lady Heather PPS and OSC > graphs....
Sorry I type faster than I think. You are right they can't be four bits. I work in rocket telemetry, you'd think I'd get this straight. I write software to unpack this kind of stuff. > A much better approach is to minimize the system errors with a GOOD antenna, > accurate position survey, proper oscillator control parameters, and > temperature stabilization (of both the receiver and power supply)... Lady > Heather is willing to oblige on the last points. A good Tbolt > implementation can get the PPS plot to under a few nanoseconds of error. I've done this. I see values in the single digit nanoseconds. I have a timing antana on a mast on the roof. Perhaps I could get a better timing antenna and low loss coax lead. LH reports the signal at 40dB, +-2dB. Is that good enough? I've seen adev plots from an Oncore MT12 (www.leapsecond.com/pages/m12-adev/) where these error estimates are added in or not and they get maybe 20% better with the corrects applied. the MT12 produces error estimates about that same size as a T-bolt. The data looks noisy on LH's graph because of the scale of the graph. Compared to the 1PPS it is a smooth function. Chris Albertson Redondo Beach, California _______________________________________________ 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.