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Owens Valley Radio Observatory

Unknown to many, OVRO hosts a whole range of radio telescopes, all of which are seen in the photo above. There is a 25-m VLBA antenna (left), a 40-m telescope studying the cosmic radio-wave background (partly obscured by it), two 27-m telescopes forming a solar interferometer (next to the right) and on the right-hand side the six 10.4-m dishes of the OVRO millimeter array.

The OVRO millimeter array (below) has long since moved to a new site, on a nearby flat mountain ridge, to join the antennae of the former Berkeley Illinois Maryland Association's (BIMA) array to form the new Common ARray for Millimeter Astronomy (CARMA).

Compared with IRAM's Plateau de Bure interferometer, the OVRO millimeter array had smaller telescopes. This leads to a larger field of view, which is an advantage for observing extended sources on the sky. The disadvantage is that it takes longer to receive the same amount of radiation (both interferometers having the same number of telescopes) and therefore one needs to spend more time to detect very faint signals.