[evlatests] AR603 3aug06: final report

[Michael Rupen]

Herewith the final report from this morning's data.  Overall 20cm 
sensitivities seem to have improved, while those at 4/6cm have gone downhill.


AR603  3aug06  03:54-05:55 IAT
------------------------------
mrupen  3aug06

Final report

EVLA ant. 13,14,16,18,24 included

Standard continuum, C X L bands (L band uses L1 setup)
3.3s averaging
elevation 20-72 degrees
mediocre weather (clear skies, API 9-20 degrees)

OVERVIEW
  Comparisons are with similar data from 26jul06.

  20cm:
     ant. 13
       IFs C no fringes
       IFs A BD worst in the array
     ant. 14 marked improvement, from very bad on 26jul06, to among the best
       on 3aug06! (within the top 4 in all IFs)
     ant. 16
       IFs AC no fringes
       IF  B is much improved, from about the worst on 26jul06, to among
         the top 5 on 3aug06
       IFs D remains awful (in the bottom 3)
     ant. 18  all IFs are now the best in the array!
        vs. IF A was among the worst on 26jul06 (BD were always fab-o)
     ant. 24 no data

   6cm:
     ant. 13
       IFs A BD worst of the array
       IF C no fringes
     ant. 14 has gone way downhill -- used to be the best in the array,
       now only middlin'
     ant. 16
       IFs AC no fringes
       IFs BD went from the top 4 to the bottom quartile
       no phase jumps when changing bands
     ant. 18
       IFs A D excellent (#2 in the array)
       IF C bottom quartile
       IF B no fringes
     ant. 24 no data

   4cm:
     ant. 13
       IF  C no fringes
       IF  A is near the bottom (24 out of 26)
       IFs BD have gotten much worse -- now they're #24 out of 26
     ant. 14 remains near the bottom, except IF A which is in the middle
     ant. 16 remains fine (upper quartile)
     ant. 18 is now about the worst antenna, in all IFs.  This
       is a big downgrading for IFs A & B, but at least C now has fringes...
     ant. 24 remains horrible (near the bottom in all IFs)
      IF C had occasional instances of ridiculously high amp. with constant
      phase (-45 or 135 degs, depending on the baseline), lasting 6-30 seconds.
      There are often associated "pretty lousy" data, occurring just before
      or just after the really horrible stuff, in which the amplitude is high
      on many but not all baselines. About 10% of the total data from this
      IF are obviously affected.

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AIPS weights: median ranking, out of a nominal
   26 antennas
   --> 1 is the best; 26 is the worst <--

         20cm   6cm   4cm
   13-A   26    26    24
   13-C  n.f.  n.f.  n.f.
   13-B   26    26    24
   13-D   26    26    24

   14-A    2    10    13.5
   14-C    4    18    22
   14-B    3     6    19
   14-D    2    11    21

   16-A  n.f.  n.f.    6
   16-C  n.f.  n.f.    5
   16-B    5    17     5
   16-D   24    19     5

   18-A    1     2    25
   18-C    1    18    25
   18-B    1   n.f.   25
   18-D    1     2    25

   24-A  ----  ----   23
   24-C  ----  ----   24
   24-B  ----  ----   23
   24-D  ----  ----   23

   ---- ==> no data
   n.f. ==> no fringes (low amp, random phase)

-------------------------------------------------------------

AIPS weights: median fractional weight
   mean weight is calculated for each record
   fractional weight is the weight for the EVLA antenna,
     divided by that mean
   the median fractional weight is the median value of the
     fractional weights, derived from the distribution across
     all records in which the antenna was present
   --> high is good <---
   --> the average VLA antenna is 1.0 <--
   --> 0.1 is 10 times worse than the average;
      10.0 is 10 times better <--

         20cm   6cm   4cm
   13-A  0.28  0.20   0.26
   13-C  n.f.  n.f.   n.f.
   13-B  0.21  0.23   0.26
   13-D  0.21  0.19   0.24

   14-A  1.38  1.14   1.03
   14-C  1.08  0.89   0.66
   14-B  1.24  1.26   0.89
   14-D  1.37  1.13   0.59

   16-A  n.f.  n.f.   1.25
   16-C  n.f.  n.f.   1.25
   16-B  1.09  0.91   1.24
   16-D  0.49  0.72   1.31

   18-A  1.62  1.44   0.20
   18-C  1.82  0.07   0.19
   18-B  1.76  n.f.   0.21
   18-D  1.91  1.35   0.19

   24-A  ----  ----   0.30
   24-C  ----  ----   0.24
   24-B  ----  ----   0.32
   24-D  ----  ----   0.29

   ---- ==> no data
   n.f. ==> no fringes (low amp, random phase)

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