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Self-balancing microwave comparison radiometer

Self-balancing microwave comparison radiometer

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A 3cm radiometer evolved from Allred's 3 Mc/s system is described. The sum and difference of the voltages from an aerial and a controllable noise source are formed in a magic-T hybrid and correlated. The correlator output, which is zero only for equal aerial and reference powers, is used to adjust the reference to equality. Lunar-eclipse observations are described.

References

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      • K.E. Machin , M. Ryle , D.D. Vonberg . The design of an equipment for measuring small radio-frequency noise powers. Proc. IEE
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      • H.J. Fink . A new absolute noise thermometer at low temperatures. Canad. J. Phys.
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      • C.M. Allred . A precision noise spectral density comparator. J. Res. NAt. Bur. Stand.
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      • M.I. Skolnik . (1980) , Introduction to radar systems.
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      • S.J. Goldstein . A comparison of two radiometer circuits. Proc. Inst. Radio Engrs.
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