[evlatests] S-band switched power behavior -- 13 September

[Rick Perley]

     I loaded the data from an 8-hour S-band run, taken with the same 
frequency tunings (but a different correlator setup) from my holography 
data.   The source and its calibrator in the 13 Sept. data are about 10 
degrees north of 3C147, the object in the holography run.
     Examination of the switched power table showed two things:

     1) This run had a nearly 'dead-on' hit from one of the Sirius 
satellites.    For about 30 minutes, there is essentially zero total 
power and zero switched power in the LCP side.  The antenna beam 
sidelobes are clearly visible -- as *decreased* power -- in the switched 
power data.
I've asked Vivek to make plots of the satellite and antenna pointing 
positions.   The RCP side was also affected, but to a much lesser degree.

     2) In general, the switched power quality for this run is far 
better than that in the holography run.  All spectral windows behave 
similarly, and none (except SPW03) are provide data which are clearly 
unrelated to what we think reality is.  As always close examination find 
oddities which shouldn't be there -- but nothing like what was in the 
holography data.

     So this would seem to indicate that the bizarre effects seen in the 
S-band holography data are certainly different than the norm, and 
perhaps unique to that particular scheduling block.  (But ... how can 
this happen?)