lbn system performance Sep01 to Aug02
apr03
The lband
narrow cals were recomputed on jul02. On 26apr03 I reran all
of the calibration scans for sep01 thru jul02 using the cal values of jul02.
The system performance was then computed. It included: gain, tsys,
sefd, beam width, coma, 1st sidelobes, beam efficiency and pointing error.
The data was taken at 1300, 1375, 1415, and 1500 Mhz with about 500
points at each frequency using 57 sources (most of the sources were not
complete tracks across the dish). On 21aug02 the lbn narrow horn was moved
to the correct focus position so the system performance changed.
All measurements with gains below 6 K/Jy and
above 13K/Jy were removed. This got rid of sources of unknown or bad flux.
It reduced the total number of measurements from 2419 to 2332.
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Fig 1 has all frequencies over plotted. Color separates the frequencies.
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Figs 2-5 have the individual frequency data. Here color separates the sources.
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Fig 1 has all frequencies over plotted. Color separates the frequencies.
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Figs 2-5 have the individual frequency data. Here color separates the sources.
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Fig 1 has the pointing error (great circle asecs) for za (top two plot)
and az (bottom two plots). The source B0824+294 had a large pointing error
because its position had been entered incorrectly in the flux calibrator
catalog (this has been corrected).
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Fig 2. This excludes the source B0825+294. The pointing error was:
12.37=sqrt(8.04^2+9.09^2) rms asecs with a mean offset of -7 asecs.
The large pointing
error was corrected in feb03 when a new pointing model was made.
processing: x101/lb/sep01_aug02/doit.pro
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