page_title: Molonglo Observatory Synthesis Telescope
section_title: Design
hierarchical_section_title: Molonglo Observatory Synthesis Telescope / Design
caption_attribution_description: English: en:Molonglo Observatory Synthesis Telescope, looking at the northern end of the North-South arm of the former Molonglo Cross Telescope.
context_page_description: The Molonglo Observatory Synthesis Telescope is a radio telescope operating at 843 MHz. It is operated by the School of Physics of the University of Sydney. The telescope is located in Hoskinstown, near the Molonglo River and Canberra, and was constructed by modification of the East-West arm of the former Molonglo Cross Telescope, a larger version of the Mills Cross Telescope.
context_section_description: The MOST consists of two cylindrical paraboloids, 778m x 12m, separated by 15m and aligned East-West. A line feed system of 7744 circular dipoles collects the signal and feeds 176 preamplifiers and 88 IF amplifiers.
  The telescope is steered by mechanical rotation of the cylindrical paraboloids about their long axis, and by phasing the feed elements along the arms. The resulting `alt-alt' system can follow a field for ± 6 hours (necessary for a complete aperture synthesis with an East-West array) only if the field is south of declination -30 degrees. For fields near this limit the signal-to-noise ratio is lower for the first and last hour or so due to the lower gain of the system at large 'meridian arc distance' angles.
  The Molonglo Cross Telescope was a 408 MHz radio telescope built by Bernard Y. Mills and collaborators and operated by the University of Sydney. It telescope consisted of a North-South arm and an East-West arm in a cross shape. Each arm was approximately one mile in length. The East-West arm was split into 88 individual elements to form the current Molonglo Observatory Synthesis Telescope.
caption: MCT antennas looking along remaining N-S arm from the north.
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