[evlatests] EVLA on 24aug06: AR603 (X band)

[mrupen at nrao.edu]

24aug06: AR603 (07:01-08:01, 14:32-15:00 IAT)
---------------------------------------------
mpr 25aug06

Final report

X band, standard continuum, 3.3s averaging, mostly fast switching scans
3.3s averaging
elevation 20-74 degrees
Fine weather (30% clouds, API 3-7 degrees)

Dynamic runs

EVLA ant. 13,14,16,18 included

ODDITIES
  On-line flagging shows the same problem as on 21aug06, with the EVLA
    antennas not flagged for the first few seconds of "subscans" of
    fast-switching scans. See 21aug06 for details.
  EVLA ant. 18 remains very noisy (Tsys 100-150 K) in all IFs
    IFs BD show 60-degree phase jumps --> L302 heartbeat issue?

OVERVIEW
 Comparisons are with similar data from 21aug06.

  4cm:
    ant. 13 is much better than on 21aug06 
      IFs ABC are now among the best
      IF D is in the top quartile
    ant. 14 is about the same -- ok but not outstanding in AC,
      lousy in BD
    ant. 16 remains very good, among the top antennas in all IFs
    ant. 18 remains by far the worst in the array, in all IFs
      Tsys is 100-150 K, vs. 30-40 K for the others
      IFs BD show 60-degree-ish phase jumps

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

               4cm
  13-A          1    
  13-C          3 
  13-B          1
  13-D          6

  14-A         13
  14-C         23
  14-B         20
  14-D         24

  16-A          4
  16-C          3
  16-B          4.5
  16-D          3.5

  18-A         26 
  18-C         26 
  18-B        p.j.
  18-D        p.j.

  ---- ==> no data
  p.j. ==> phase jumps
  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 <--

               4cm
  13-A         1.44
  13-C         1.30
  13-B         1.37
  13-D         1.22

  14-A         0.99
  14-C         0.74
  14-B         0.85
  14-D         0.63

  16-A         1.22
  16-C         1.29
  16-B         1.13
  16-D         1.22

  18-A         0.03
  18-C         0.01
  18-B         p.j.
  18-D         p.j.

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

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