[daip] [!11945]: AIPS - BPASS complains about the IFs

[Mar Mezcua]

Mar Mezcua updated #11945
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BPASS complains about the IFs
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           Ticket ID: 11945
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/11945
                Name: Mar Mezcua
       Email address: mmezcua at iac.es
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 19 April 2018 12:51 PM
             Updated: 19 April 2018 12:51 PM
           Reply due: 23 April 2018 12:51 PM (4d 0h 0m)
      Resolution due: 13 January 2021 12:00 AM (999d 11h 9m)

Hi,I'm going through the data reduction of a VLBA dataset which has two IFs, each with a very different frequency (4.4 GHz and 7.6 GHz). To load the UVDATA I use >fitld separating IF1 and IF2. This went fine and if I do >listr in the IF1 dataset I get:

FQID IF#      Freq(GHz)      BW(kHz)   Ch.Sep(kHz)  Sideband  Bandcode   1   1       4.41200000  128000.0078    500.0000      1
which is OK. Yet, when doing >imheader, the terminal returns:AIPS 1: Image=MULTI     (UV)         Filename=NGC5252_4GHz.UVDATA.   1AIPS 1: Telescope=VLBA               Receiver=VLBAAIPS 1: Observer=BL226A              User #=    2AIPS 1: Observ. date=23-MAR-2016     Map date=03-APR-2018AIPS 1: # visibilities    223697     Sort order  TBAIPS 1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  TIME1  SUBARRAYAIPS 1:            SOURCE  FREQSEL  INTTIM  GATEID  ANTENNA1  ANTENNA2AIPS 1:            CORR-IDAIPS 1: ----------------------------------------------------------------AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   RotatAIPS 1: COMPLEX      3   1.0000000E+00       1.00  1.0000000E+00    0.00AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00AIPS 1: FREQ       256   4.4120000E+09       1.00  5.0000000E+05    0.00AIPS 1: IF           2   1.0000000E+00       1.00  1.0000000E+00    0.00AIPS 1: RA           1    00 00 00.000       1.00       0.000000    0.00AIPS 1: DEC          1    00 00 00.000       1.00       0.000000    0.00AIPS 1: ----------------------------------------------------------------
as if there were 2IFs.
IF2 is of course empty, so when doing the calibration I specify bif 1; eif 1 in all tasks.
However, when arriving to the bandpass calibration AIPS complains about having 2 IFs and bpass doesn't run. I specify:

bpassprm(10)=2ichansel 5,256,1,1
so that it uses only IF1, however it still complains:localh> BPASS1: Dividing the spectral data by channel 0localh> BPASS1: BPCOPY: copied      7308 vis records for bandpass fittinglocalh> BPASS1: CHNCOP: REQUESTED TOO MANY IFS :    2>   1localh> BPASS1: Purports to die of UNNATURAL causes

I have redone the calibration without specifying bif 1;eif 1 in the previous calibration steps (the bandpass is the last step I do before the imaging), and I've tried also not to specify the IF for normalizing the amplitude in >bpass, but it doesnt' work, >bpass keeps on complaining. Any idea why?Thanks,Mar

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