[daip] UV modelling / UVSUB

[Hans-Rainer Kloeckner]

Dear Eric,

	I hope you are fine and I also  hope you can help me, please. I'm running into a problem I do not fully understand .

I try to model a visibility set for a GMRT dataset using UVSUB.

Now this is what I have done. 

1. I have replaced all the real and imaginary values of the visibilities to zero (doing all channels).
2. than I have add ONE point source at the phase centre to it, by using UVSUB (7.33473 Jy, DFT,factor -1 ).

So far so good. Now if I have a look into the visibilities e.g. amplitude versus time,  some of the  
baselines show a rather strange amplitude behaviour always at the end of the last scan (e.g. 1-29, 1-30). 
It seems that the flux shouting up. Now the source is above 45 elevation so not sure what causes this jump in amplitude.

Could that be related to some smoothing etc. ?

I have attached 2 files:

Amplitude versus time plot
JJJ_MODEL_AMP_I.ps_pages file 

Model visibilities for antenna 1 
JJJ.FITS

I hope you might have an idea.

cheers and thanks for hopefully considering to have a look into it.

Hans




--------------------------------------------------------
Hans-Rainer Kloeckner
--------------------------------------------------------
Max-Planck-Institut fuer Radioastronomie
Auf dem Huegel 69
53121 Bonn
Germany
+49 (0)228 525-314
hrk at mpifr-bonn.mpg.de
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