Automated double-frequency testing technique for mapping receive interference responses

This paper presents the basic principles of a double-frequency testing technique for highly informative visualization of the linear and nonlinear interference responses of receivers. The technique is implemented with an automated double-frequency test system (DFTS) built around conventional controlling and measuring equipment. The main advantages of DPTS are gained by using the principles of raster-like changing of test signals frequencies combined with visualization of test results as two-dimensional (2-D) raster images of the receiver-under-test double-frequency diagrams (or interference response maps). Basic functionalities of the technique for double-frequency testing, which make possible automated detection and identification of all types of interference in the receiver and measurement of their parameter´s, are described. Results of practical implementation of this technique for testing super-high frequency (SHF) receivers, RF amplifiers (RFA) and diode generator are discussed