[evlatests] Question about SY tables

[Michael Rupen]

I think we can test this directly -- we'll try to have a go today.
No need to zoom through those file ;)

           Michael

> Rick,
>
>   The format of the SysPower.xml table makes it easy to lose entries
> but if the antennas are labeled correctly, the AIPS table should be
> correctly labeled.  The way to check for sure is to look at the
> SysPower.xml for the affected antenna and spectral window.  This is a
> (HUGE) text file that you can look at in a text editor with zillions
> of entries like:
> <row>
>    <antennaId>Antenna_10</antennaId>
>    <spectralWindowId>SpectralWindow_0</spectralWindowId>
>    <timeInterval>4791441374499999744 1000000512</timeInterval>
>    <feedId>0</feedId>
>    <numReceptor>2</numReceptor>
>    <switchedPowerDifference>1 2 -1.617337 0.554469</switchedPowerDifference>
>    <switchedPowerSum>1 2 115.65394 114.87765</switchedPowerSum>
>    <requantizerGain>1 2 512.0 512.0</requantizerGain>
> </row>
>
> Times are mjd in nanoseconds.  Note, Antenna and spectral window Ids
> are NOT antenna or IF numbers and you have to look them up in the
> Antenna.xml (antenna number is the integer value of the second two
> characters in name) and SpectralWindow.xml (the relationship between
> spectral window and AIPS 'IF" is complex) tables.
>
> -Bill
>
>
>
> Rick Perley writes:
> >     While editing the SY tables for the 'flux densities' data for
> > L-band, I noted subband 4 (1180 -- 1244 MHz) has very nice switched
> > power data.  This is unexpected, as the SPFLG plots for this subband
> > show the presence of very strong interference -- the GPS L2 signal is
> > centered at 1227 MHz, and should (must!) wreck havoc with switched power.
> >
> >     So:  The Question:  How sure are we that the SY table entries
> > originate from the identified subband?  That is -- how sure are we that
> > the data I'm looking at (in AIPS) which is listed for subband 4 really
> > is from that subband?
> >
> >
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