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Publication Citation: The 30/60 MHz Tuned Radiometer - The NIST System for Noise Temperature Measurements

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Author(s): Chriss A. Grosvenor; Robert L. Billinger;
Title: The 30/60 MHz Tuned Radiometer - The NIST System for Noise Temperature Measurements
Published: May 01, 2002
Abstract: The NIST Noise Project has completed reconstruction of their 30/60 MHz tuned, coaxial (Type N) radiometer system. This system is used at low frequencies where isolators are impractical to incorporate. Without isolators, the ambient and cryogenic standards are tuned to the impedance of the device under test to minimize mismatches. Although this system had been in existence prior to this technical note, enough modifications and improvements have been made to warrant a new discussion. This note will briefly review the original system, discuss the theory as well as the design, testing, and capabilities of the present system. A more detailed uncertainty analysis is included and an appendix for troubleshooting the system.
Citation: NIST TN - 1525
Keywords: noise;noise measurement;noise temperature;radiometer;thermal noise;
Research Areas: Microwave Measurement Services