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General characteristics |
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Frequency range: 150 - 450 MHz |
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Baselines from 50 to 3200m (25 to 4,800 l) |
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576 baselines (with some redundancies) |
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Spatial resolution: ~4 to 0.3 arcmin (depending
on frequency, declination, snapshot/synthesis) |
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Field of view: from 3 to 0.5 degrees |
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Stokes I and V |
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Time resolution: 5 ms* number of frequencies |
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General characteristics (cont.) |
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Bandwidth: 700 kHz |
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Dynamic: 45 db (power in that bandwidth) |
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Separate flux receivers set attenuators (time
constant: 5 ms) |
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Multifrequency done by high speed (5ms)
frequençy switching between 5 to 10 frequencies |
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Further integration gives standard mode: 8
Im./sec for 5 almost simultaneous frequencies. |
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Low gain antennas: (~wide band dipoles) |
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Severe sensitivity limitation at high frequency |
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One linear polarization |
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Data processing |
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Integrated datas (images, fits,mpeg) available
on line after the observation |
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10 sec integrated datas available on line 2
weeks after |
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High resolution data on request |
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Software |
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NRH package included in Solarsoft: image
processing, parameters as function of time, CLEAN… |
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Mpeg daily files (2000 june ,14) |
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Upgrade ( spring 2002 ?) |
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4 antennas (low gain log-periodic), adding 68
visibilities in the central part of the u-v plane |
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Larger field of view |
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Aliasing suppressed in most cases |
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Better flux measurement for extended objects |
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Notes