[daip] New Ticket - [!MXD-251093]: Problem with SPLIT and polarization calibration

[Craig Walker]

New Ticket: Problem with SPLIT and polarization calibration

Got this when I tried to SPLIT VLBA data that had had the D term polarization calibration done with LPCAL:

localh> SPLIT1: Doing subarray  1
localh> SPLIT1: UVGET: Using flag table version   2 to edit data
localh> SPLIT1: Create OJ287       .SPLIT1.   1 (UV)  on disk  2  cno   30
localh> SPLIT1: Applying CL Table version    10
localh> SPLIT1:            Previously flagged   flagged by gain         kept
localh> SPLIT1: Partially               0               15858              0
localh> SPLIT1: Fully                   0                   0          15858
localh> SPLIT1: New NX table written
localh> SPLIT1: Copied OB file from vol/cno/vers  2    9   1 to  2   30   1
localh> SPLIT1: Copied WX file from vol/cno/vers  2    9   1 to  2   30   1
localh> SPLIT1: Updating FREQ in AN tables
localh> SPLIT1: Resetting pol cal values in output AN tables
localh> SPLIT1: Reformatted AN file from vol/cno/vers  2    9   1 to  2   30   1
localh> SPLIT1: TABKEY: TABLE KEYWORD POLTYPE  NOT FOUND
localh> SPLIT1: SPLTHI: ERROR 21 READING POLZN TYPE
localh> SPLIT1: Appears to have ended successfully
localh> SPLIT1: localhos 31DEC09 TST: Cpu=      0.8  Real=      2  IO=        29

The TABKEY and SPLTHI errors seem a bit ominous.

POLTYPE is there and is set to VLBI in the input file AN table.
It is not there in the output file, according to PRTAB.
The output file is left with a WRITE flag - another ominous sign.

I reran the identical SPLIT with DOPOL=-1 and did not get the error.
POLTYPE is not there in the output AN table.
There is no write flag.

I'm going to drop the write flag and proceed with processing.  But if you know that my 
data are likely corrupted, please let me know.

Here are my inputs:

>inp split
AIPS 1: SPLIT     Task to split multi-source uv data to single source
AIPS 1: Adverbs     Values                 Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1:                                    also works on single files.
AIPS 1: INNAME     'BW092A_2'              Input UV file name (name)
AIPS 1: INCLASS    'MULTI'                 Input UV file name (class)
AIPS 1: INSEQ         1                    Input UV file name (seq. #)
AIPS 1: INDISK        2                    Input UV file disk unit #
AIPS 1: SOURCES    'OJ287'                 Source list
AIPS 1:            *rest ' '
AIPS 1: QUAL         -1                    Source qualifier -1=>all
AIPS 1: CALCODE    ' '                     Calibrator code '    '=>all
AIPS 1: TIMERANG   *all 0                  Time range to copy
AIPS 1: STOKES     ' '                     Stokes type to pass.
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           0                    Lowest IF number 0=>all
AIPS 1: EIF           0                    Highest IF number 0=>all
AIPS 1: BCHAN         3                    Lowest channel number 0=>all
AIPS 1: ECHAN        28                    Highest channel number
AIPS 1: SUBARRAY      0                    Subarray, 0=>all
AIPS 1: DOCALIB       2                    > 0 calibrate data & weights
AIPS 1:                                    > 99 do NOT calibrate weights
AIPS 1: GAINUSE      10                    CL (or SN) table to apply
AIPS 1: DOPOL         1                    If >0 correct polarization.
AIPS 1: BLVER        -1                    BL table to apply.
AIPS 1: FLAGVER       2                    Flag table version
AIPS 1: DOBAND        1                    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: OUTCLASS   'SPLIT1'                Output UV file name (class)
AIPS 1: OUTSEQ      100                    Output UV file name (seq. #)
AIPS 1: OUTDISK       2                    Output UV file disk unit #.
AIPS 1: DOUVCOMP     -1                    1 (T) => compressed data
AIPS 1: APARM         2           1.9661   Control information:
AIPS 1:               0           1          1 = 1 => avg. freq. in IF
AIPS 1:               0           1                   multi-channel out
AIPS 1:            *rest 0                     = 2 => avg. freq. in IF
AIPS 1:                                               single channel out
AIPS 1:                                        = 3 => avg IF's also
AIPS 1:                                      2 = Input avg. time (sec)
AIPS 1:                                      3 > 0 => Drop subarrays
AIPS 1:                                      4 > 0 => calibrate weights
AIPS 1:                                      5 = 0 pass only xc data
AIPS 1:                                        = 1 pass xc and ac data
AIPS 1:                                        = 2 pass only ac data
AIPS 1:                                      6 > 0 add full source name
AIPS 1:                                            to header
AIPS 1: NCHAV         1                    Number of chan. to average.
AIPS 1:                                    (used if APARM(1) = 1)
AIPS 1:                                    <= 0 -> ALL
AIPS 1: CHINC         1                    Channel incr. between output
AIPS 1:                                    channels (used if APARM(1)=1)
AIPS 1: ICHANSEL   *all 0                  Array of channel start, stop,
AIPS 1:                                    and increment numbers and IF
AIPS 1:                                    number to be used when
AIPS 1:                                    averaging in frequency.
AIPS 1:                                    (used if APARM(1) = 2, 3)
AIPS 1: BADDISK    *all 0                  Disks to avoid for scratch


Ticket Details
===================
Ticket ID: MXD-251093
Department: Data Processing (AIPS)
Priority: Normal
Status: Open
Link:  http://nrao.helpserve.com/staff/index.php?_m=tickets&_a=viewticket&ticketid=50