[daip] PCAL ...

[Eric Greisen]

Rick Perley wrote:
>    On 'Sechelt', userid 33, disk 5, slotid 1.
> 
>    Here is the error message:
> 
> go pcal
> PCAL 1: Task PCAL   (release of 31DEC11) begins
> AIPS 1: Resumes
>  >PCAL 1: UVGET: Using flag table version   1 to edit data
> PCAL 1: Solved for spectral indices - will use:
> PCAL 1: Num  Name                I        Q        U        V
> PCAL 1:   1  3C48              -0.9723   0.0000   0.0000   0.0000
> PCAL 1:   2  3C84               0.0000   0.0000   0.0000   0.0000
> PCAL 1: Processing IF number  1 channel     1
> PCAL 1: PCLCOP: Copying data for IF  1 to work file
> PCAL 1: POLARIZATION MODEL NOT PROVIDED
> PCAL 1: Purports to die of UNNATURAL causes
> PCAL 1: sechelt 31DEC11 TST: Cpu=     26.0  Real=     53  IO=      2061
> 
> Here are the inputs:
> 
> AIPS 1: PCAL    Task to compute polarization corrections
> AIPS 1: Adverbs     Values                 Comments
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: INNAME     '8BIT-11NOV'            Input UV file name (name)
> AIPS 1: INCLASS    'B0D0AP'                Input UV file name (class)
> AIPS 1: INSEQ         2                    Input UV file name (seq. #)
> AIPS 1: INDISK        5                    Input UV file disk unit #
> AIPS 1:                                    Data selection (multisource):
> AIPS 1: CALSOUR    '3C48'                  Sources to calibrate with
> AIPS 1:            '3C84'  *rest ' '
> AIPS 1: QUAL         -1                    Calibrator qualifier -1=>all
> AIPS 1: CALCODE    ' '                     Calibrator code '    '=>all
> AIPS 1: TIMERANG   *all 0                  Time range to use.
> AIPS 1: SELBAND      -1                    Bandwidth to select (kHz)
> AIPS 1: SELFREQ      -1                    Frequency to select (MHz)
> AIPS 1: FREQID       -1                    Freq. ID to select.
> AIPS 1: BIF           1                    Lowest IF number 0=>all
> AIPS 1: EIF           8                    Highest IF number 0=>all
> AIPS 1: ANTENNAS      6           7        Antennas to solve for.
> AIPS 1:              10          14          23          26
> AIPS 1:            *rest 0
> AIPS 1: UVRANGE       0           0        UV range in kilolamdba
> AIPS 1: SUBARRAY      0                    Subarray, 0=>all
> AIPS 1:                                    Cal. info for input:
> AIPS 1: DOCALIB       1                    > 0 calibrate data & weights
> AIPS 1:                                    > 99 do NOT calibrate weights
> AIPS 1: GAINUSE       0                    CAL table to apply.
> AIPS 1:                                    CLEAN map (optional)
> AIPS 1: BLVER        -1                    BL table to apply.
> AIPS 1: FLAGVER       1                    Flag table version
> AIPS 1: DOBAND        3                    If >0 apply bandpass cal.
> AIPS 1:                                    Method used depends on value
> AIPS 1:                                    of DOBAND (see HELP file).
> AIPS 1: BPVER         1                    Bandpass table version
> AIPS 1: SMOOTH     *all 0                  Smoothing function. See
> AIPS 1:                                    HELP SMOOTH for details.
> AIPS 1: ICHANSEL   *all 0                  Array of start and stop chan
> AIPS 1:                                    numbers, plus a channel
> AIPS 1:                                    increment and IF to be used
> AIPS 1:                                    to select channels to sum to
> AIPS 1:                                    find the polarization.
> AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
> #
> AIPS 1:                                    0 => all channels
> AIPS 1: IN2NAME    ' '                        Cleaned map name (name)
> AIPS 1: IN2CLASS   ' '                        Cleaned map name (class)
> AIPS 1: IN2SEQ        0                       Cleaned map name (seq. #)
> AIPS 1: IN2DISK       0                       Cleaned map disk unit #
> AIPS 1: INVERS        2                    CC file version #.
> AIPS 1: NCOMP      *all 0                  # comps to use for model.
> AIPS 1:                                    1 value per field
> AIPS 1: FLUX          0                    Lowest CC component used.
> AIPS 1: NMAPS         0                    No. Clean map files
> AIPS 1: CMETHOD    ' '                     Modeling method:
> AIPS 1:                                    'DFT','GRID','    '
> AIPS 1: CMODEL     ' '                     Model type: 'COMP','IMAG'
> AIPS 1:                                    'SUBI' (see HELP re images)
> AIPS 1: DOMODEL      -1                    > 0 => use model, do not
> AIPS 1:                                    fit source Q and U
> AIPS 1:                                    = 2 use CP table model
> AIPS 1: PMODEL     *all 0                  Source poln. model
> AIPS 1: SPECPARM   *all 0                  Spectral index: I Q U V for
> AIPS 1:                                    each CALSOUR
> AIPS 1: SOLINT        0                    Soln. interval (min) 0=>5.
> AIPS 1: SOLTYPE    ' '                     Solution type:
> AIPS 1:                                    'ORI-', 'APPR', 'RAPR'
> AIPS 1: SPECTRAL      1                    > 0 do spectral PCAL
> AIPS 1:                                    <= 0 do continuum PCAL
> AIPS 1: INTPARM    *all 0                  Smoothing parameters for
> AIPS 1:                                    spectral mode
> AIPS 1: PRTLEV        1                    Print statistics 0=>none
> AIPS 1:                                    1 = some, 2 = lots. Use 1.
> AIPS 1: REFANT       23                    Reference antenna, 0->pick
> AIPS 1: BPARM      *all 0                  Task enrichment parameters
> AIPS 1:                                    for SOLTYPE 'ORI-' only:
> AIPS 1:                         
>    But here is the most interesting issue:
> 
> On the next file (slotid 2), it worked fine!
> 
> So what is wrong with this file?

It has no valid data for 3C48 for those antennas with the calibration 
applied.  With DOBAND=-1 there are data and with doband=+1 there are 
(insane) LL data with RR, RL, and LR flagged.

PCAL should count valid vis by source to see if there are any.

Eric