MWA X8 data on PicA

Plots show an illustrative subset of antennas.

• uvspec vis=PicA.uv stokes=xx,yy select="ant(1,5,12,17)" \
   interval=15 options=nocal,nopass \
   nxy=3,6 device=/vcps 
  

  View plot (pdf file).

  Even after autoflag, YY is generally too high on many baselines.
  Also, some baselines (e.g. BL 17--19) look strange...
  Frequent bad channel near right edge of band.

• uvspec vis=PicA.uv stokes=xx,yy select="ant(1,5,12,17)" \
   axis=chan,phas interval=15 options=nocal,nopass \
   nxy=3,6 device=/vcps 
  

  View plot (pdf file).

  Phase generally looks coherent except BL 7--*, maybe BL 15--*

• uvspec vis=PicA.uv stokes=xx,yy select="ant(1,5,12,17)" \
   interval=15  nxy=3,6 device=/vcps 
  

  View plot (pdf file).

  Freakish outcome!
  ALL of YY channels are bad.
  Many XX channels are bad on most BLs - like sharp narrow-band RFI.
  Handful of XX BLs look normal.

• uvspec vis=PicA.uv stokes=xx,yy select="ant(1,5,12,17)" \
   axis=chan,phas interval=15  nxy=3,6 device=/vcps 
  

  View plot (pdf file).

  Phase is generally noisy - nocal,nopass looked a lot better.
  Few baselines look very coherent; several have phase wraps.

Shami Chatterjee shami at astro.cornell.edu Created: 26 Aug 2009