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A recent ADAP showed an aerial view of an ATCA antenna on the
east-west rail track, and noted that while five antennas can move
along the 3km east-west track (and 214m north-south spur) the sixth
antenna is fixed in position 3km to the west.
However, as the archival image above reveals, that was not always the
case! Initially, CA06 was able to be moved along a short east-west
track between two station posts ~50m apart, in order to provide a
larger range of antenna spacings. However, it was found there was no
real need to move CA06 as other array configurations provided a
sufficient range of baseline lengths, and so the rails from CA06 were
removed and reused when the north-south spur was built in the late
1990s. (Image credit: CSIRO Radio Astronomy Image Archive)
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