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The North American Regional Broadcasting Agreement to define technical standards for AM band radio stations came into effect.
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North American Regional Broadcasting Agreement
1941 AM/mediumwave radio station allocation agreement
The North American Regional Broadcasting Agreement refers to a series of international treaties that defined technical standards for AM band (mediumwave) radio stations. These agreements also addressed how frequency assignments were distributed among the signatories, with a…Source: Wikipedia (CC BY-SA)
Medium wave
Radio transmission using wavelengths 200-1000 m
Medium wave (MW) is a part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytime, reception is usually limited to more…Source: Wikipedia (CC BY-SA)