The design, construction, and performance of a 100hyphen;MHz noise spectrometer are described. Basically a 100hyphen;MHz bridge, this system uses the properties of a double balanced mixer to enable the experimenter to determine spectral densities of fluctuations in the real or imaginary parts of a sample impedance, as well as the real part of the crosshyphen;spectral density. Calibration circuits and techniques are described. The results of measurements on commercial 50hyphen;OHgr; terminators demonstrate fluctuations of both the real and the imaginary parts of the impedance and partial correlation between them.
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