The Reduction of Radio Interference in Aeronautical Communications Systems

Radio interference suppression must be considered in early design stages for maximum effectiveness. The chief sources of interference to communication systems are spurious and harmonic radiations, corona and precipitation static, and co-channel and adjacentchannel interference. Other interference sources such as ignition systems, rotating machinery and contacting devices are not included in the scope of this paper. Interference may render some equipments inoperative or produce distortion in others. Most types of interference can be successfully eliminated by the reduction of transmitter spurious radiation, reduction of receiver susceptibility, antenna design to reduce mutual coupling, and judicious frequency assignments.