[daip] Problems with NX table in VLBI/VSOP data

[Eric Greisen]

On 10/29/2018 05:39 PM, Andy Biggs wrote:
> Hi Eric,
> 
> I had already run UVSRT (I tried MSORT as well) and that doesn't fix the 
> problem. I don't think there are any subarray issues.
> 
> The problem seems to be the following. The scan order is the following:
> 
> 1 source   = J1041+06
> 2 source   = J1033+07
> 3 source   = J1033+07
> 4 source   = J1033+07
> 5 source   = J1033+07
> 6 source   = J1058+01
> 7 source   = J1033+07
> 
> If I UVCOP 1041 and 1033 and run INDXR, it seems to be totally unaware 
> of the gap where J1058+01 (scan 6) is supposed to be. This gap is about 
> 5 minutes, but INDXR with CPARM=1,0 will not find it. Therefore, AIPS 
> really seems to think that these sources were observed at the same time 
> and thus interleaves them in the NX file.
> 

Try running prtuv in the time range from the middle of scan 5 to the 
middle of scan 7.  If you set dparm(6) to 1, you will get the random 
parameters and so can see the source number and the time.  If INDXR is 
unaware of scan 6 when having only J1033+07, then there are data points 
of J1033+07 in that interval as well as data points of J1058+01.

Eric