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| rdfs:label | - List of United States AM frequency allocations
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| rdfs:comment | - The first law which governed assignment of frequencies to radio transmitting stations was enacted in 1912. It divided the radio spectrum into four portions:
* A government band from 600 to 1600 meters (500 to 187.5 khz) chosen for its groundwave coverage.
* Two commercial-use bands:
* Above 1600 meters (below 187.5 khz (which had even better groundwave coverage, and was used for transoceanic communication facilities).
* From 600 meters to 200 meters (500 khz to 1500 khz) used by commercial stations which had less need for long-distance coverage. Some frequencies in this range, such as 300 meters (1000 khz) and 220 meters (1365 khz), were set aside because ship antennas were too short for effective use on longer wavelengths.
* An amateur frequency, 200 meters (1500 khz),
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| abstract | - The first law which governed assignment of frequencies to radio transmitting stations was enacted in 1912. It divided the radio spectrum into four portions:
* A government band from 600 to 1600 meters (500 to 187.5 khz) chosen for its groundwave coverage.
* Two commercial-use bands:
* Above 1600 meters (below 187.5 khz (which had even better groundwave coverage, and was used for transoceanic communication facilities).
* From 600 meters to 200 meters (500 khz to 1500 khz) used by commercial stations which had less need for long-distance coverage. Some frequencies in this range, such as 300 meters (1000 khz) and 220 meters (1365 khz), were set aside because ship antennas were too short for effective use on longer wavelengths.
* An amateur frequency, 200 meters (1500 khz), which was thought to be useless and was grudgingly given to amateurs so they were not totally frozen out. Individual amateurs were permitted to be granted special licenses for use in the 200-600 meter frequency band to permit communications between them for "relay" work, but they were highly restricted. The rules stated that "...a special license will be granted only if some substantial benefit to the art or to commerce apart from individual amusement seems probable."
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