[time-nuts] Some results of PRS10 and Trimble Resolution

Fred King n9rkm at wi-net.com
Tue Jun 27 18:29:39 EDT 2006


   In the series of sawtooth displays are these all the same M12 and if
   so how did it happen that you have this result in a short time?


   On Tue Jun 27 15:45 , 'Tom Van Baak' <tvb at leapsecond.com> sent:

     For example, a 25 MHz oscillator in a GPS engine allows
     the processor to pick, each second, which one of 25 million
     edges it wants to be the official 1 PPS edge for that second.
     Now 25 MHz frequency is 40 ns period so that gives a 1 PPS
     granularity of +/- 20 ns in this example. See:
     If that makes sense, then what's sawtooth correction?
     In short, the sawtooth correction describes, to the best
     guess of the receiver, how early or late the hardware
     1 PPS was.
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