[daip] UVFLF -cannot unflag VLBA data

[Eric Greisen]

Robert Mutel wrote:
> Hi,
> 
> I am trying to use UVFLG to unflag a VLBA antenna which was falsely 
> flagged during the observation [BM267A, 6 April 08, antenna HN, 
> ellipsoid position
> does not match, but doesn't affect data, according to operator log. It 
> appears that UVFLG was recently modified [July 15] so there might be a 
> new gremlim.
> 
> My UVFLG inputs are
> 
> #inp
> AIPS 1: UVFLG:  Task to Flag selected UV data on disk.
> AIPS 1: Adverbs     Values                 Comments
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: INNAME     'BM267A'                UV data (name).
> AIPS 1: INCLASS    'UVDATA'                UV data (class).
> AIPS 1: INSEQ         1                    UV data (seq. #).  0 => high
> AIPS 1: INDISK        1                    Disk unit #.  0 => any
> AIPS 1: INFILE     *all ' '                Text file name.
> AIPS 1: SOURCES    *all ' '                Sources selected/deselected
> AIPS 1: SUBARRAY      0                    Subarray number 0=>all.
> AIPS 1:                                    Elevation is flagged: 0=>1
> AIPS 1: SELBAND      -1                    Bandwidth to flag (kHz)
> AIPS 1: SELFREQ      -1                    Frequency to flag (MHz)
> AIPS 1: FREQID       -1                    Freq. ID to flag. -1=>all.
> AIPS 1:                                    0=> first Freq. ID.
> AIPS 1: TIMERANG   *all 0                  Time: start day,hr,min,sec
> AIPS 1:                                          stop day,hr,min,sec.
> AIPS 1: BCHAN        -1                    First frequency channel
> AIPS 1: ECHAN        -1                    Last channel 0=>all
> AIPS 1: BIF          -1                    First IF 0=>1
> AIPS 1: EIF          -1                    Last IF 0=>all
> AIPS 1: ANTENNAS      5           5        Antennas
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1:               5           5           5           5
> AIPS 1: BASELINE   *all 0                  Baselines with ANTENNAS
> AIPS 1: STOKES     ' '                     Stokes' parameters
> AIPS 1: OUTFGVER      2                    Flag table version number
> AIPS 1:                                       Used w single-source too
> AIPS 1: APARM      *all 0                  1:elevation lower cutoff deg
> AIPS 1:                                    2:elevation upper cutoff deg
> AIPS 1:                                    3:Factor of suppression of
> AIPS 1:                                      spurious fringes caused by
> AIPS 1:                                      pulse cal when fringe
> AIPS 1:                                      rate close to zero.
> AIPS 1:                                      It must be >1
> AIPS 1:                                      0 => do not flag due to
> AIPS 1:                                        this reason
> AIPS 1:                                    4:>0 => Print source, time,
> AIPS 1:                                       baseline,  U,V of expected
> AIPS 1:                                       zero fringe rate (U=0)
> AIPS 1:                                      0 => do not print
> AIPS 1: OPCODE     'UFLG'                  'FLAG','UFLG', 'REAS', 'WILD'
> AIPS 1: REASON     *all ' '                Reason (24 char.)
> AIPS 1: DOHIST       -1                    > 0 -> add to history
> 
> According to the help file:
>  OPCODE.....Tells whether to flag or unflag the data.
>              'FLAG' => flag the data,
>              'UFLG' => unflag with adverbs including REASON
>                        Note that the adverbs must match the flag or be
>                        set to special "ignore this adverb" values.
>                        Defaults are not applied for UFLG.
> 
> Perhaps one or more adverbs are not set to 'ignore this adverb', but I 
> can't determine which one(s).
> I also tried REASON  '*', no luck. The PRTAB table says REASON = 
> 'Ellipsoid posn error', which I also tried
> without success - anten 5 is still flagged [as determined by, e.g., 
> LISTR output]

As I said - I made it fussy on UFLG - which is why I reinstated REAS and 
added WILD OPCODEs.  The flags created by the VLBA are explicit in 
listing subarray (1) and sources (at least 1 and 2) in the flags.  So 
UFLG might have worked with SUBARRAY=1 and both sources listed in 
SOURCES and TIMER=-1.  This particular function is better done with REAS 
or WILD.  I will look at making a way to say no source name checking.

Eric Greisen