At 39.3/116
نویسندگان
چکیده
Detailed here is a method and results from measurements of the beam characteristics of the ATCA antennas. We have used a celestial radio source, in the observing bands of the receivers, in preference to a satellite beacon signal. Scans over the source were made to derive the beam patterns, and these were Hankel transformed to derive the amplitude of the radial aperture illumination. The advantage of this is that the measurements are taken at normal operating frequencies, using a normal feed, giving results that are relevant to the telescope performance for astronomical observations. It may be noted here that holography at the ATCA has used a special feed that purposely over-illuminates the edges of the antenna.
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