[daip] Taks manual phase-cal

[caohongmin]

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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> 
 		 	   		  
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