Homodyne generator and detection system

This paper presents a discussion of the operation of a homodyne generator and detection system that can be used to measure high values of attenuation, antenna patterns, etc. from the u.h.f. through the microwave frequency range. The experimental results were obtained with a practical X-band homodyne generator employing readily available commercial components, and using a sawtooth generator in conjunction with a traveling wave tube amplifier as the single side band generator. A brief outline of the operation of the complete system is presented, followed by a discussion of the sensitivity, dynamic range and the magnitude and sources of possible errors. These are illustrated with some experimental results obtained from the actual X-band equipment. In addition, recommendations for improving certain features along with possible modifications of such a system for other purposes are discussed.