Single Path Phase Measuring System for Three-Centimeter Radio Waves

Abstract
A practical system is described for making single‐path phase measurements at X‐band over ranges up to about 20 miles with instrumental noise of the order of a fraction of one degree. The techniques for obtaining the necessary transmitter frequency stability of 1:109 are described. The use of such techniques to form a simple microwave repeater system with power gain of the order of 50 db is discussed.