Aerospace Instrument-Making Annotation << Back Principles of construction of an aviation automatically included stationary radio beacon of space system of search and saving COSPAS-SARSAT N.V. Dedov, M.S. Leonov, I.V. Nikushkin Principles of construction of an aviation automatically included stationary radio beacon (ELT AF) of space system of search and rescue COSPAS-SARSAT with input of exact coordinates from the navigating system of an aircraft are considered. The principle of formation carrying frequency and of the law of phase modulation on the channel of 406 MHz is stated at use of the microprocessor.