Measurement of Microphonic Noise

In the course of designing an airborne radar system, there is inevitably a requirement that the equipment does not generate microphonic noise over a specified level. The level of interest can be such that accurate measurement can be difficult. This paper compares three measuring systems: a simple microwave bridge system, the commercially available Allscott system, and a coherent system conceived and developed after the above two systems were found inadequate. Also presented are results of tests performed on typical microwave components.