[time-nuts] Progress of my HP Z3801A
xaos at arachne.darksmile.net
Mon Aug 28 17:55:05 EDT 2006
I have written a Linux based control and graph
application for the HPZ3801A. The software also
controls Motorola GPS Receivers.
It is curses based and also generates graphs
of Holdover Uncertainty and EFC (TI values are also stored).
For some graphs of my two Z3801A's look here:
You can get the software from here:
under software download.
> Fellow Time-nuts,
> I've left my HP Z3801A unattended but running for quite some time. It now seems
> to have started making more sense. When I checked it a few days ago, it was
> still a bit high in Predicted holdover uncertainty, but right now it clocks in
> at 900 ns/initial 24 hrs. That's about 1E-11 in frequency error. Pretty
> impressive. Now, this is only one sample, so I expect it to be worse for
> awhile (while it dropped to 800 ns). Ah well. Let's see if it sticks. If so,
> I may have a good unit after all, or maybe it is just a better environment for
> it now, who knows.
> I am wondering whatever fun I could make of the builtin forth-interprenter, but
> right now I am considering writing myself a logging application (this is not
> the time to again give me tons of links to Windows-apps - no use!).
> For the clock-status I'm considering logging the TI-difference and holdover
> For GPS status I'm considering logging the tracked signal-strengths at their
> different Azimuth and Elevation values. The actual satelite tracks themselfs
> isn't as interesting as their position in the sky relative to my antenna and
> what the signal strength map I get from that.
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