The <a href="https://en.wikipedia.org/wiki/RATAN-600" class="extiw" title="w:RATAN-600">RATAN-600</a> <a href="https://en.wikipedia.org/wiki/radio_telescope" class="extiw" title="w:radio telescope">radio telescope</a>, located at Zelenchukskaya in the North Caucasus, Russia, has the largest aperture of any single radio telescope in the world.  Beginning operation in 1977, it consists of a ring of angled plane reflectors 600 m in diameter, focusing radio waves on a central conical feed antenna.  It covers a frequency range of 600 MHz to 30 GHz with an angular resolution of 1 arcminute at 30 GHz.
<a rel="nofollow" class="external text" href="https://www.panoramio.com/user/5662176">александр с кавказа</a>
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<a href="//commons.wikimedia.org/wiki/File:RATAN_600.jpg" title="File:RATAN 600.jpg">File:RATAN 600.jpg</a>