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This is the 25 m. antenna of the Raaoe space observatory, situated in
Onsala, not very far from Gothenburg, Sweden. Built in 1963, the radio
telescope is still going strong, run by Chalmers Technical University
and used for space research.
With a weight of some 100,000 kilogrammes, the antenna is obviously
stationary, however and of course partially manoeuvrable. Its dish is not
solid but rather shows a network texture so as to facilitate the passage
of wind (wind speeds exceeding 13 m/s, though, are problematic). The
texture of the antenna's dish allows for work to be carried out in the
wavelength range of 4 to 30 cm.
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