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To facilitate the new capabilities of the MWAX system, a few new key/value pairs have been added to the metafits file format. Default values can be assumed, in the absence of these new key/value pairs.

Delay Corrections within the Correlator

KeyValuesDefault (if not present)Notes
DELAYMOD
  • "NODELAYS"
  • "CABLE"
  • "TILEBEAM"
  • "FULL"
"NODELAYS"Human readable representation of the delay mode.
DELDESC
  • "No delays applied"
  • "Apply cable delays and phase to zenith"
  • "Phase up to primary beam pointing direction"
  • "Phase to source with real-time calibration"
"No delays applied"Human readable description of the delay mode.

The above key/values are shorthand for specific settings of 3 new keys describing how delay corrections are handled:

KeyValues
CABLEDEL
  • 0 == none
  • 1 == MWAX has already corrected for the cable and receiver clock cable lengths
  • 2 == MWAX has corrected for cable and receiver clock cable lengths AND the pointing-dependent delays due to beamformer dipole delays
GEODEL
  • 0 == off
  • 1 == zenith
  • 2 == tile-pointing
  • 3 == az/el table
CALIBDEL
  • 0 == off
  • 1 == on

The DELAYMOD thus determines the above 3 setting values:

DELMODDELDESCCABLEDELGEODELCALIBDEL
NODELAYS
000
CABLE
210
TILEBEAM
220
FULL
231

Visibility Scaling Factor

KeyValuesDefault (if not present)Notes
RAWSCALEfloating point1The multiplier that was used by the MWAX correlator to scale raw visibilities down to Janksy-like units
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