Brief theoretical information, methodological instructions, procedures for performing laboratory work, methods for processing measurement results, and questions for self-test are provided. Much attention is paid to the study of circuits with active elements. The work is designed for modern technical equipment - a two-beam oscilloscope, a spectrum analyzer, an electronic phase meter and a universal stand of the LKTC type. Recommendations are given on the choice of topics for laboratory tasks for different numbers of teaching hours. For students of technical schools of all communications specialties.