The study of a rectangular waveguide on the main wave: method. Instructions to the laboratory. Work No1" by O. A. Yurtseva is a unique and valuable manual for students and specialists in the field of radio engineering and electromagnetic waves. This publication is not just a set of methodological guidelines, but a real find for those who seek to better understand the physical processes occurring in waveguides, and to master the practical skills of working with them. Waveguides are devices that are used to transmit electromagnetic waves, and their research is an important part of training in radio engineering. Yurtsev's book offers readers a detailed guide to conducting laboratory work related to the study of rectangular waveguides on the main wave. The author shares his knowledge and experience, which makes the text not only informative, but also accessible to perception. The book discusses the basic principles of waveguides, their design and characteristics, as well as methods of their research. This book will be especially useful for students of technical specialties, graduate students and young scientists interested in radiophysics and electronics. It will be an excellent help for those who want to deepen their knowledge in the theory and practice of working with waveguides. It can also be evaluated by teachers who use methodological instructions for organizing laboratory classes and coursework .. The topics raised in the book cover a wide range of issues: from the theoretical foundations of electromagnetic waves to the practical aspects of their measurement and analysis. Yurtsev pays attention to both mathematical models and experimental methods, which allows the reader to get a holistic view of the subject. The book also touches on the optimization of waveguide designs and their application in modern technologies, which makes it relevant for researchers and developers. The author’s style is distinguished by clarity and logical presentation . About. A. Yurtsev is an experienced teacher and researcher who knows how to convey complex ideas to the reader. His previous work has already established itself in the scientific community, and this book will not be an exception. Yurtsev actively publishes articles and training manuals, and his approach to learning is always aimed at the practical application of knowledge. The book “Study of a Rectangular Waveguide on the Main Wave” will become an indispensable assistant for anyone who wants not only to master the theory, but also to learn how to apply it in practice. It will help readers develop analytical thinking, learn to work with experimental data and draw conclusions based on the results obtained. If you are looking for a quality radio training manual or want to deepen your knowledge in the field of waveguides, this publication will be an excellent choice for you. It will not only expand your horizons, but also inspire further research and experimentation in this fascinating field of science. Do not miss the opportunity to get acquainted with the work of O. A. Yurtseva is not just a book, but a whole world full of discoveries and new knowledge.