The Measurement of Delay Distortion in Microwave Repeaters*

Measuring equipment is described which is capable of measuring delay distortion of the order of 10−9seconds in a wide band microwave television relay repeater. Two measuring circuits are discussed. The first is a circuit for measuring the relative phase shift versus frequency from which the delay distortion may be computed. The second circuit gives the delay directly from a single measurement. The measuring equipment is designed to work in the intermediate frequency range from 50 to 80 megacycles, but by applying suitable conversion equipment measurements can be made at microwave frequencies.