[daip] [!8340]: AIPS - wrong RDBE Tsys for BC204A, HN: what can be done?

[Amy Mioduszewski]

Amy Mioduszewski updated #8340
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       Staff (Owner): Amy Mioduszewski (was: -- Unassigned --)
                 Due: - Cleared - (was: 05 May 2016 03:32 AM)

wrong RDBE Tsys for BC204A, HN: what can be done?
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           Ticket ID: 8340
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/8340
           Full Name: Yuri Kovalev
               Email: yyk at asc.rssi.ru
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Amy Mioduszewski
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 03 May 2016 03:32 AM
             Updated: 03 May 2016 01:03 PM
      Resolution Due: 11 May 2016 03:32 AM (7d 14h 28m)



Dear Yuri,

I think it might be impossible to figure out why the Tsys became negative for HN since this is from so long ago.  It might be that in the early days of doing the Tsys through the RDBE so there were bugs.

I looked at the Tsys for the legacy system which was still in place at the time and they look OK, so I assume that the data for HN is actually OK.  I think the best work around for this is to use the Tsys measurements from the legacy system for HN.  You can do this by getting the bc204acal.vlba file and extracting the Tsys for HN, then you need to add an INDEX line (see EXPLAIN ANTAB for details on INDEX lines) to tell ANTAB what Tsys to assign to what IF.   Since the legacy system does not have as many BBCs as the PFB you will probably have to assign single Tsys columns to multiple BBCs, if  you have trouble with the INDEX line, don't hesitate to ask.  Then load the Tsys with ANTAB.



Amy Mioduszewski
NRAO

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