[evlatests] Question about SY tables

[Bryan Butler]

note that we are about to switch to a binary SysPower file.  bill, you 
should get the format from rich moeser.

	-bryan


bcotton at nrao.edu wrote, On 1/28/11 05:50 AM:
> 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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