MR-650 “Podberezovik”

The MR-650 “Podberezovik” (Cyrillic: МР-650 «Подберезовик») is a family of naval long-range radars designed for maritime surveillance and target assignment, operating in the UHF band (IEEE designation) or C band (NATO designation), with an instrumented range of 270 nautical miles (500 km). The “Podberezovik-E” basic model features an amplitron in its transmitter's output stage and a 7.22 × 3.0-meter passive, frequency-controlled phased array antenna with 15 rows of 28 slotted waveguide radiators. The “Podberezovik-ET1” version utilizes a fully transistorized transmitter, and to compensate for its lower power, it employs a doubled-height antenna measuring 7.22 × 6.25 meters with 30 waveguide rows. The “Podberezovik-ET2” is a simplified variant that omits the transmitter tube from the basic version's final stage and uses the larger antenna, resulting in approximately half the energetic range, detecting a small fighter aircraft at 240 km instead of 400 km, and a sea-skimming cruise missile at 45 km instead of 70 km.

radartutorial.eu: https://www.radartutorial.eu/19.kartei/07.naval2/karte074.en.html