I worked at a place where we actually did launch rockets, big ones. We did have a few LED displays that were driven by IRIG but really the "clocks" were mostly computer displays with time in the corner some place. The display is ether on a monotor of it is projected on a screen. Projectors have gotten cheap. Most of those special purpose displays were stored in closets under boxes IBM punch cards or the like.
For a display time-nut level accuracy is not really even needed because the refresh rate on the display is on the order of 1/100 second soi. NTP over Ethernet is more than enough for a visual display. The screen refresh is the weak link, (well really the human eye/brain is.) Now for real time keeping (vs. the display) you probably want something that runs off GPS. On Sun, Jan 11, 2015 at 9:12 AM, Bill Hawkins <[email protected]> wrote: > Martin, > > It seems like the only cost-effective way to get that display is to > find a surplus source. If that's not possible, how about mounting a > flat panel computer monitor on the wall and driving it with some > custom software in a commercial computer with a standard operating > system. There are standard ways to handle NTP, IRIG-B, and 1 PPS. > > Do you need to hold the countdown the way NASA does? Does the clock > provide the electrical signal to launch or deploy? > > Bill Hawkins > > -----Original Message----- > From: Martin A Flynn > Sent: Sunday, January 11, 2015 9:31 AM > > I am looking for a GMT/GET mission time clock that has the following > characteristics: > > * Reads T minus prior to launch or deployment, T plus after. > * Second display for GMT. > * Simulating it on a PC display would be OK, would prefer an LED/LCD > version for wall mounting > > There is a example of what I am looking for in the background of this > photo: https://www.hq.nasa.gov/alsj/a16/A16_116_13_15.jpg . We have > NTP, IRIG-B, and a 1 PPS source to work with. > > Any suggestions on a cost-effective way to accomplish this? > > Cheers > Martin Flynn > > > _______________________________________________ > 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. -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
