Next organizations support and take part in developing of the RadioAstron project.

• NRAO, USA

Low-noise amplifier in the band 18-25 GHz.

• Helsinki University of Technology, Finland

22 GHz on-board receiver was used for all tests of scientific equipment. It was recently replaced by new Russian 18-25 GHz receiver operating in a frequency switching mode.

• European Space Agency (ESA)

Nordwik test of SRT reflector petals in vacuum chamber.
Observatory of Newchatel, Switzerlad
Rubidium on-board frequency standards.

• Tata Institute for Fundamental Research (TIFR), India

327-MHz on-board low-noise amplifier.

• CSIRO, Australia

1665-MHz on-board receiver.

• Ground radio telescopes operating on the basis of peer reviewed proposals.

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