There are 1116 actuators mounted on the backing structure, which move the surface panels to correct for the distortion of the mirror with elevation.

A quadrupod supports a 7.9 metres (26 ft) diameter subreflector, with 49 panels in three rows, as well as primary focus instrumentation.

The welded steel alidade then supports the elevation wheel, which is in turn connected to the primary mirror backing structure.

A room at the base of the alidade holds the motor power supplies, antenna control system, and cryogenic compressors.

[4] The contract to fabricate the telescope structure and mechanics started in 2003, and the construction of the foundations was completed in 2004.

[3] The telescope can operate in single dish mode, measuring continuum, polarisation and spectra.