[evlatests] EVLA status: AR603, 20jul06

[mrupen at nrao.edu]

AR603 20jul06  04:20-06:20 IAT
------------------------------
mpr 20jul06

Report of data quality (as measured by AIPS weights)

EVLA ant. 14,16,18 included

Standard continuum, C X K bands
3.3s averaging
elevation 35-70 degrees
Excellent weather (clear sky, API 4-6 degrees)

OVERVIEW
  Ant. 13 was not available

  Ref.Ptg. failed on ant. 14 in two of three X-band ptg. scans.
    I assume this is because IFs BD are so horrible at 4cm (7 times worse
    than the median VLA antenna).

  6cm:
    ant. 14 is excellent -- one of the top two antennas in IFs A & BD;
      IF C is a bit less awesome (upper quartile)
    ant. 16
      IFs AC gave no fringes
      IF  B was excellent (one of the top antennas)
      IF  D was OK (upper quartile)
    ant. 18 has no data
  
  4cm:
    ant. 14 is basically awful, except for IF A which is middle-of-the-road
      IFs C & D were by far the worst in the array
    ant. 16 was ok, not stunning (upper quartile)
    ant. 18 
      IFs A & B were middle-of-the-road
      IFs C & D were pretty lousy (among the worst 3 antennas in the array)

  1.3cm:
    ant. 14 is pretty bad -- but note the failure of ref.ptg.
    ant. 16 is middle-of-the-road, except IF D which is lousy
    ant. 18 is the worst in the array

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

          6cm   4cm  1.3cm
  14-A     1    14   21.5
  14-C     6    26   24
  14-B     1    22   17
  14-D     2    26   20

  16-A   n.f.    6.5 16
  16-C   n.f.    9   15
  16-B     1     8   18
  16-D     6     8   23.5

  18-A   ----   14   26
  18-C   ----   24   26
  18-B   ----   13   26
  18-D   ----   24   26

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

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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 <--

          6cm   4cm   1.3cm
  14-A   1.46   0.95  0.82
  14-C   1.19   0.14  0.40
  14-B   1.55   0.81  0.32
  14-D   1.41   0.15  0.38

  16-A   n.f.   1.08  0.94
  16-C   n.f.   1.10  0.96
  16-B   1.54   1.06  0.89
  16-D   1.23   1.12  0.67

  18-A   ----   0.93  0.58
  18-C   ----   0.77  0.44
  18-B   ----   0.97  0.58
  18-D   ----   0.73  0.46

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

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