[time-nuts] GPS receiver time message offsets to 1PPS
Hal Murray
hmurray at megapathdsl.net
Tue Jul 26 07:51:27 UTC 2016
holrum at hotmail.com said:
> I originally thought the SCPI receivers would be right on time due to
> my original measurements of their message jitter, but when I started
> measureing the actual message arrival times... surprise, surprise, surprise!
> I think the issue is due to the fact that they use Motorola receivers and
> those ramp the time the message comes out (1 msec per second).
One of us is confused. Do you have a scope?
I have 2 different programs. Both agree that the arrival time is stable.
Attached is a histogram. There is no PPS on the system collecting the data
so there is 200 micro-sec peak-peak of noise on the reference clock. But
most of that is due to daily temperature swings and I don't have enough data
to cover that yet.
If you don't find anything, I'll clean up a program so you can run it on your
hardware.
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