AIPS HELP file for VLAMP in 31DEC18
As of Sat Jan 20 15:48:00 2018
VLAMP: Undoes and re-does nominal sensitivity application
INNAME Input UV file name (name)
INCLASS Input UV file name (class)
INSEQ 0.0 9999.0 Input UV file name (seq. #)
INDISK 0.0 9.0 Input UV file disk unit #
FREQID 0.0 Frequency ID number: 0 -> 1
SUBARRAY 0.0 Subarray: 0 -> 1
FLAGVER -1.0 > 0 => apply flags to input
tables, may cause warnings
INVERS Input SY table
GAINVER Input CL table
IN2VERS Input GC table
Output text file name
Task: For the EVLA, the SysPower table in the SDM records the switched
power when the noise tube is on and the switched power when the
noise tube is off. If the AIPS files are obtained via OBIT ---
AIPS "verb" BDF2AIPS --- then an SY table is available. It may
be applied to adjust the gains and the data weights. For the
phased VLA, used in VLBI observations, a suitable gain factor
may be determined from the tables and written into a form
acceptable to ANTAB.
For details, see EVLA Memo 145 by Rick Perley (May 2010).
TYSMO, SNEDT, EDITA, and SNPLT all understand SY tables and
allow you to manipulate and/or view them. At present, VLAMP
edits the SY table only by applying a flag table and simple
rules regarding SY-data reality (Psum > Pdif > 0 mainly). It
may be advisable to correct the input SY table via TYSMO, SNEDT,
or even SYCOP before running VLAMP.
Note that this task assumes that the Sun (and hence the "Solar
cals") was not used during the experiment.
INNAME.....Input UV file name (name). Standard defaults.
INCLASS....Input UV file name (class). Standard defaults.
INSEQ......Input UV file name (seq. #). 0 => highest.
INDISK.....Disk drive # of input UV file. 0 => any.
FREQID.....Frequency ID number to do 0 => 1
SUBARRY....Subarray to do 0 => 1
FLAGVER....If > 0, apply the specified flag table version to the
table data. Unlike regular calibration routines (but
like UVCOP), FLAGVER = 0 means no flagging. Be aware
that the SY table is flagged and ends up replacing the
input SY table. At that point, the data and CL table may
have times out of range of the SY table, leading to
extrapolation warning messages. On the other hand, the
SY values may not be correct until the antennas are on
source, etc. so this may be preferable to using the
SY values that will be flagged later.
INVERS.....Input version number of the SY table to be used.
GAINVER....Input version number of the CL table to be used.
IN2VERS....Input version number of the GC table to be used.
OUTTEXT....Name of output text file.