[evlatests] Unflagged antennas and absent PDif

[Rick Perley]

A closer look at the test data from yesterday reveals a few things:

Important note:  All the 'dead' and 'weak' antennas listed below were not flagged by the on-line system.

By 'no PDif', I mean that the PDif values were less than 10 milli-counts.  Typical PDif values are 100 to 500 milli-counts.  Some are as low as 50, the highest I've seen is 6200 millicounts (this from ea01 at Ku-band — which has a serious 'PDif' problem as well).
By 'dead', I mean correlations show only noise on a strong source.

  1.
X-band
     *
No PDif:  ea01 in B and D, ea09 in B, ea12 in C.
     *
Notes:     ea01 had very low visibility amplitudes in IFs B and D.  ea09 has low visibilities in IFs B and D
  2.
Ku-band
     *
No PDif:  ea09 in A, ea12 in C, ea25 and B and D.
     *
Notes:  all the above had zero visibility amplitudes —showing only noise.
  3.
K-band
      No PDif:  ea09 in B, ea12 in D
     *
Notes:  ea07 very weak in A and C, ea09 dead in B, ea12 dead in D
  4.
Ka-band
     *
No PDif:  ea09 in B, ea12 in D
     *
Notes:  ea01 very wek in A and B, ea07 dead in C, ea09 dead on B, ea12 dead in D, ea25 dead in A and C.
  5.
Q-band
     *
No PDif:  ea02 in A and C, ea09 in B, ea12 in D
     *
Notes:  ea02 dead on all IFs.  ea09 dead on B, ea12 dead in D, ea25 dead in A and C.

Other than these few issues, the data quality from yesterday's test is outstanding.  Referenced pointing was done 9 times over slightly more than an hour — all solutions were good, with residual pointing errors less than 10 arcseconds.




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