Ukrainian T-shaped Radio telescope, second modification

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Ukrainian T-shaped Radio telescope, second modification
UTR-2 radio telescope.jpg
The antenna of the UTR-2 consists of an array of dipole antennas
Alternative namesUTR-2 Edit this at Wikidata
Part ofGiant Ukrainian Radio Telescope
URAN Edit this on Wikidata
Location(s)Volokhiv Iar, Ukraine Edit this at Wikidata
Coordinates49°38′17″N 36°56′10″E / 49.6381°N 36.9361°E / 49.6381; 36.9361Coordinates: 49°38′17″N 36°56′10″E / 49.6381°N 36.9361°E / 49.6381; 36.9361 Edit this at Wikidata
OrganizationInstitute of Radio Astronomy of the National Academy of Sciences of Ukraine Edit this on Wikidata
Wavelength9.1 m (33 MHz)-37 m (8.1 MHz)
Built1970 Edit this on Wikidata–1972 Edit this on Wikidata (1970 Edit this on Wikidata–1972 Edit this on Wikidata) Edit this at Wikidata
First light1972 Edit this on Wikidata
Telescope stylephased array
radio telescope Edit this on Wikidata
Angular resolution40 minute of arc Edit this on Wikidata
Ukrainian T-shaped Radio telescope, second modification is located in Ukraine
Ukrainian T-shaped Radio telescope, second modification
Location of Ukrainian T-shaped Radio telescope, second modification

The Ukrainian T-shaped Radio telescope, second modification (official abbreviation UTR-2) is the world's largest low-frequency radio telescope at decametre wavelengths. It was completed in 1972 near the village of Hrakovo (49°38′N 36°56′E / 49.633°N 36.933°E / 49.633; 36.933), 15 km west-south-west from Shevchenkove, Ukraine. The telescope is operated by the Institute of Radio Astronomy of the Ukrainian Academy of Sciences.

Some of the 2040 cage dipole elements of which the antenna is composed
Geometrical configuration of the UTR-2 radio telescope
West arm of UTR-2 radio telescope phased array antenna (6×100 dipoles)

The UTR-2 consists of an array of 2040 dipole elements in two arms each containing 6 rows of elements, oriented in a T shape: a north-south arm consisting of 1440 elements covering an area of 1800×60 meters, and an east-west arm consisting of 600 elements covering an area of 900×60 meters. The basic element is a broadband cage dipole 1.8 m in diameter and 8 m long made of galvanized steel wire, mounted 3.5 m above the ground, with a balun to connect it to the transmission line. The dipoles are all oriented along the east-west axis, with the spacing between rows of 7.5 m in east-west direction and 9 m in north-south. It has a total area of 150,000 square metres (1,600,000 sq ft), and a resolution of about 40 arcminutes at the middle frequency 16.7 MHz. The operating frequency range is 8–33 MHz. The sensitivity is about 10 mJy.

Steering of the antenna main lobe is accomplished with phase shifters consisting of switchable delay lines.

The telescope is a part of the URAN (Ukrainian Radio Interferometer of NASU) decametric VLBI system, which includes another four significantly smaller low-frequency radio telescopes. That system has bases from 40 to 900 km (25 to 960 mi).


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