[daip] Fwd: Re: Taks manual phase-cal

[Amy Mioduszewski]

-------- Forwarded Message --------
Subject: 	Re: [daip] Taks manual phase-cal
Date: 	Tue, 20 Oct 2015 13:27:22 -0600
From: 	Amy Mioduszewski <amiodusz at nrao.edu>
To: 	caohongmin <hmcao at outlook.com>



Hi Hongmin,

Can you tell me the project code and date of your observation so I can 
have a look at the details?  Although what I said before still applies.  
Try doing the manual phase cal on source 1 or 3, and check that it 
worked O.K., for the other sources for the antenna that went missing.

Thanks!

Amy

On 10/17/2015 07:24 AM, caohongmin wrote:
> Hi Amy,
>
> Thanks, it's helpful. I'll try that if there are phase/delay jumps.
> We have 3 targets, after finishing the first one, one of the antenna 
> just stopped,
> while other antennas kept observing other sources. When coming to the 
> last (3rd) target,
> this antenna restarted (the 2nd target is not available for this 
> antenna).
>
> best,
>       hongmin
>
> > Date: Fri, 16 Oct 2015 14:06:40 -0600
> > From: amiodusz at nrao.edu
> > To: egreisen at nrao.edu; hmcao at outlook.com
> > CC: daip at nrao.edu
> > Subject: Re: [daip] Taks manual phase-cal
> >
> > Hi Hongmin,
> >
> > Unfortunately the answer is, it depends. Do you know why the antenna
> > went missing? There have been phase/delay jumps seen when setups
> > change. If, in particular, the antenna was pre-empted to do UT1-UTC
> > measurements then there might be a problem, because that involves
> > changing setups. So I would do the manual phase-cal, and check it
> > before and after the jump to make sure the correction is OK for the
> > whole time. If there is a problem, it can probably be worked around,
> > get back to me and I can probably give you a recipe.
> >
> > Amy
> >
> > On 10/16/2015 12:55 PM, Eric W Greisen wrote:
> > >> Hi Eric,
> > >>
> > >> Now I got a problem which i am not sure:
> > >> I want to use a very strong source as the calibrator for manual 
> phase cal
> > >> (VLBI data).
> > >> But one of the antennas stopped and restarted before the scan of this
> > >> source (note above).
> > >> Then whether the manual phase-cal could work properly for this 
> case (?)
> > >>
> > >> best,
> > >>
> > >> Hongmin
> > >>
> > >>
> > > My guess is that the phase will change in the stop/restart
> > > so that this antenna's phase will have a jump in it. Amy
> > > may know more.
> > >
> > > Eric Greisen
> > >
> > >
> > > _______________________________________________
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> > > Daip at listmgr.nrao.edu
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> >
>
>
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