The reference book contains information on the basics of radio electronics. Materials on the theory of electromagnetic field, radio wave propagation are presented. The issues of reliability of radio electronic equipment, physical fundamentals of electronics are considered, the necessary information on the mathematical apparatus used in radio electronics is given. Materials on the theory of communication, detection and resolution of signals are presented, as well as linear, nonlinear, parametric circuits, harmonic signal generators are considered. The handbook is intended for specialists in the field of radio electronics, as well as engineers and technicians in other fields related to radio electronic equipment.