This textbook corresponds to the standard program in the discipline "Basics of Radio Engineering and Telecommunications" for the specialty 5B071900 "Radio Engineering, Electronics and Communications" Fifteen sections cover the basics of radio engineering and telecommunications from the simplest concepts to technologies. It is designed to help communication students who study in English. This textbook deals with the fundamentals of radio engineering, telecommunication networks and systems, characteristics of systems and data transmission channels, algorithms for constructing telecommunication networks and systems. The textbook is intended for bachelors of technical universities specialty 5B071900 – "Radio Engineering, Electronics and Telecommunications".