An absolute cold reference for measurements at UHF and in the microwave band

Details An absolute cold reference for measurements at UHF and in the microwave band An absolute cold reference for measurements at UHF and in the microwave band

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jphe...22..963l&link_type=abstract

Journal of Physics E - Scientific Instruments (ISSN 0022-3735), vol. 22, Nov. 1989, p. 963-966.

Astronomy and Astrophysics

Astronomy

8

Cryogenic Equipment, Microwave Frequencies, Radio Astronomy, Ultrahigh Frequencies, Calibrating, Cryogenic Temperature, Noise Temperature

Scientific paper

A cold source operating at liquid helium temperature, used for absolute calibrations during radio-astronomical observations at 600 MHz and 2500 MHz, is reported. Made with commercial dummy loads and coaxial cables in a standard Dewar bottle, it operates both at liquid helium and liquid nitrogen temperatures. A procedure for measuring the effective noise temperature of the source is described.

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