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Radio Interference

Communication by radio means is subject to interference44 so intense at times as to render the systems inoperative. Such interference has been mentioned in preceding chapters, and methods of minimizing its effects have been discussed, particularly in Chapter 13 in considering transoceanic systems. Radio interference is defined45 as "an undesired disturbance in reception, or that which causes the undesired disturbance. Radio interference may thus be a disturbance at the radio transmitter, the transmission medium, or the radio receiver. Some examples of radio interference are background interference in the transmitter, undesired disturbance in the transmission medium as by lightning or undesired radio waves, and hum or thermal agitation in the receiver."

Radio interference is of several types as follows:44

  • Selective Interference. Radio interference whose energy is concentrated in a narrow band of frequencies. Some examples are other radio stations on the same or adjacent frequencies, harmonics of other radio stations, and unshielded diathermy equipment.

  • Radio Station Interference. Selective interference caused by the radio waves from a station or stations other than that from which reception is desired.

  • Electrical Interference. Interference caused by the operation of electrical apparatus other than radio stations. It may be either selective interference or noise, usually the latter.


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Last Update: 2011-05-30