From: David Forbes <[EMAIL PROTECTED]> Subject: Re: [time-nuts] List of time synchronization hardware and software Date: Tue, 17 Jan 2006 15:50:58 -0700 Message-ID: <[EMAIL PROTECTED]>
> At 6:40 PM +0100 1/17/06, Magnus Danielson wrote: > > > >But besides that, pulsars are cool. Since the planet is orbiting, a few > >pulsar > >needs to be continously measured and compensation needs to be > >performed for the > >rotation. Isn't those used for monitoring the UTC deviations in VLBI? > > > >Cheers, > >Magnus > > Magnus, > > I work on the Heinrich Hertz submillimeter telescope on Mt. Graham. > We are going to be doing a VLBI run in early April. > > I just asked our resident VLBI guy what we'll be using for > synchronizing our telescope to the others for our upcoming run at > ~230 GHz. He said that GPS is used, since it's better than a > microsecond and is readily available with no fuss. Each site will > have a hydrogen maser for the data clock. These masers are currently > being calibrated against each other. Sounds about right from what I've heard before. I know people here in Sweden that does that too. Interesting how those people slip into the time and navigational buissnesses as experts. Ah well. > Pulsars are nearly invisible at that frequency. We have plans to look > for an existing bright pulsar at 80 GHz and expect to need to > integrate photons for a week to see it. Hmm.... "bright pulsar" and "integrate photons for a week". You guys have an interesting adjustment of normality scale. For me "bright" usually means time to put on shades. So I was right, I don't want to buy such a telescope just to keep time. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
