This radar is part of those installations that have become obsolete or simply no longer economically viable than the former USSR, whereas some have only been discovered with time.
This is the case of the “Duga” system (arc in Russian), a complex of enormous antennas capable of detecting the launch of long-range missiles directed on Soviet territory.
The Radar has been active for just over 10 years.
Its antennas are enormous, among the largest in the world: 150 meters high, 90 meters wide and 900 meters long.
The Radar emitted a characteristic repetitive fixed signal, so much so that the nickname by which it was more or less known was “Russian woodpecker”.
The originating signal was so strong that it could easily be heard on radios all over the world.