AVIATION RADIO DIRECTION FINDERS AND NON-DIRECTIONAL BEACONS: PRINCIPLES OF OPERATION AND THEIR IMPORTANCE IN AVIATION

Abstract

This paper examines the role of aircraft radio direction finders and non-directional beacons (NDBs) in ensuring safe and accurate air navigation. Two categories of radio direction finding systems are considered: airborne and ground-based systems, including their classification and operational purpose. The operational principles of non-directional beacons are analyzed, with emphasis on their operating modes (“Homing” and “Communication”) and key system components such as the tone generator and call-sign keying unit. The study also discusses NDB types, coverage areas, and their application in approach and en-route navigation. Particular attention is given to signal transmission principles, identification procedures, and voice communication functionality within the system.