| Special Issues
at Low Frequencies: Calibration (cdt.) |
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| • | Calibrators |
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| – | Very few (5 ?)
strong calibrators |
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| – | All of them have
structure above 1000 l. |
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| – | Calibrators are
not polarized |
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| • | No signal on X-Y
correlators: corrected by rotating some |
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| antennas by 45
degrees during calibrations. |
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| – | Calibrators flux
decreases strongly with increasing |
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| frequency |
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