The big clocks on the walls of the control center were largely eye-candy for visitors, but the individual clocks at each console were continuously used by the operators for everything (there was no computer display of time). All important technical timing was run from dedicated sequencers but it might be "kicked off" from IRIG-derived pulses on some occasions (in my experience it might be spec'ed to be kicked off from IRIG but in real life it was initiated by pushbutton).
Some control centers used a second audio channel to distribute elapsed mission time via IRIG. That wasn't exactly my kind of control center but I got to visit them. In decades past I worked extensively with analog multitrack telemetry and voice recorders that would record the IRIG analog code at same time as data and voice. On playback we would both watch pulses and carrier from IRIG on pen charts and scopes to derive timestamps, and we would also hook up a standard IRIG-driven clock to the recorded IRIG audio show where we were in the playback. We had at least one special playback station that could show IRIG time correctly through variable speed forward and reverse driven by the IRIG audio carrier. Much later we used minicomputers with ADC's to digitize the data, timestamp derived from IRIG audio. Tim N3QE On Sun, Jan 22, 2017 at 1:31 AM, Ruslan Nabioullin <[email protected]> wrote: > Hi, looking at pictures of various time metrology equipment setups for > best practices and inspiration, I have commonly seen time of day display > unit(s) installed in racks containing processing or time transfer > equipment, e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_ > Master_Clock.jpg. All that these units do is merely display the time of > day and sometimes the date, typically by means of seven segment LED > displays, of the time code inputted to them (typically IRIG-B, I'm > guessing). Any ideas why such a unit is necessary when one can simply look > at the time displayed by timing receivers and time code generators (and > even some standards), and the interface of some fusor, defined in this > context as a system which performs timing data fusion (by implementing a > paper clock or a more primitive algorithm) and timekeeping, either by means > of a direct shell, or via something like NTP? > > Thanks in advance, > Ruslan > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
