Design and implementation of a low-noise prime-focus S/X receiver system for radio astronomy

This paper discusses the design, construction, and measured performance of dual-band, dual-polarization, prime focus receiver systems used on three antennas at the NRAO facility in Green Bank, WV. The receivers operate at Sand X-bands near 2.3 and 8.4 GHz. Described is the development of a new dualband feed horn, a cryogenics package with waveguide input ports using HEMT low-noise amplifiers, and a receiver system using optical fiber microwave links to transmit frequency reference and IF signals. Measured performance of major components and the overall installed system is given.<
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