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

Fred King n9rkm at wi-net.com
Wed Jun 28 07:45:31 EDT 2006


   Hmmm......  How fast could one update the internal cable delay value?
   N9RKM
   On Tue Jun 27 19:41 , 'Tom Van Baak' <tvb at leapsecond.com> sent:
   
     Now, another way to handle this is to run the hardware
     1 PPS output, with all its jitter, though a programmable
     nanosecond-resolution digital delay generator. Each
     second you use the firmware reported future negative
     sawtooth as the programmed delay value for the next
     1 PPS pulse. Tom Clark and I talked about this years
     ago and Rick Hambly implemented this as an option
     in his CNS Clock II ( [1]http://www.cnssys.com/ ).
     Note this hardware trick only works for GPS OEM
     boards that predict sawtooth error for the next 1PPS
     (vs. reporting the sawtooth error of the previous 1PPS).
     Motorola is OK here.
     If you're tempted, see some programmable delay lines at:
     [2]http://www.maxim-ic.com/products/timers/delay_lines.cfm
     /tvb
     [3]http://www.LeapSecond.com
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References

   1. file://localhost/tmp/parse.pl?redirect=http%3A%2F%2Fwww.cnssys.com%2F
   2. file://localhost/tmp/parse.pl?redirect=http%3A%2F%2Fwww.maxim-ic.com%2Fproducts%2Ftimers%2Fdelay_lines.cfm
   3. file://localhost/tmp/parse.pl?redirect=http%3A%2F%2Fwww.LeapSecond.com
   4. javascript:top.opencompose('time-nuts at febo.com','','','')
   5. file://localhost/tmp/parse.pl?redirect=https%3A%2F%2Fwww.febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts


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