[time-nuts] Some results of PRS10 and Trimble Resolution
n9rkm at wi-net.com
Wed Jun 28 07:45:31 EDT 2006
Hmmm...... How fast could one update the internal cable delay value?
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 ( 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:
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