[evlatests] AO223

[Ken Sowinski]

On Thu, 23 Aug 2007, Gustaaf van Moorsel wrote:

> scan  band  type
> 1      C    flux cal
> 2      X    flux cal
> 3      C    phase cal
> 4      C    source
> 5      C    phase cal
> 6      C    source
> etc.
>
> There are no problems in the X-band observations.
>
> In the C-band observations,  50% of the visibilities in the first
> scan are flagged by the online system.  Of the remaining 50%, only
> some baselines show reasonable data.  Some involve VLA, some EVLA
> antennas.
>
> In the third scan (the C-band phase cal scan) *all* visibilities
> are flagged by the online system.
>
> Loading the data with the online flags off suggests that the data
> were flagged for a good reason.
>
> Subsequent C-band scans seem to be OK.
>
> Any idea what's going on?

Problems with the frist scan have been noted for a long time and
are still under investigation.  I have not seen clear evidence of
subsequent scans misbehaving in a gross way.  If you can tell me
when this happened I can try to find out why the antennas were
flagged.