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The array at Chernobyl, Ukraine, viewed from a distance in 2014
The array at Chernobyl, Ukraine, viewed from a distance in 2014
Duga-1 array within the Chernobyl Exclusion Zone. The array of pairs of cylindrical/conical cages on the right are the active elements, fed at the fac
Duga-1 array within the Chernobyl Exclusion Zone. The array of pairs of cylindrical/conical cages on the right are the active elements, fed at the facing points with a form of ladder line suspended from stand-off platforms at top right. A backplane axial reflector of small wires is visible left of center, most clearly at the bottom of the image. The elements appear to be a modified type of cage or bi-conical dipole providing wide operating bandwidth.
Steel structure of Duga-1 from below
Steel structure of Duga-1 from below
Panoramic view of the landscape surrounding Duga-1. The Chernobyl Nuclear Power Plant is visible in the far left, close to the horizon.
Panoramic view of the landscape surrounding Duga-1. The Chernobyl Nuclear Power Plant is visible in the far left, close to the horizon.
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How a skywave OTH radar works: A powerful shortwave signal from a large transmitting antenna (left) reaches a target beyond the horizon by refracting
How a skywave OTH radar works: A powerful shortwave signal from a large transmitting antenna (left) reaches a target beyond the horizon by refracting off the ionosphere, and the echo signal from the target (right) returns to the receiving antenna by the same route. In practice, the beams are much closer to the horizon than shown here.
Duga radar array, near Chernobyl
Duga radar array, near Chernobyl
Coverage of the three U.S. Navy ROTHR stations in Texas, Virginia, and Puerto Rico
Coverage of the three U.S. Navy ROTHR stations in Texas, Virginia, and Puerto Rico
Transmitter array, Sector 6, Christmas Valley, Oregon
Transmitter array, Sector 6, Christmas Valley, Oregon