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AM expanded band : ウィキペディア英語版 | AM expanded band
The extended mediumwave broadcast band, commonly known as the () expanded band, is a broadcast frequency allocation. It moves the upper limit of the AM bandplan from 1610 to 1700 kHz. == History == The band became officially available around 1993—only in ITU region 2 (North and South America). It is popular with micro-broadcasting for having less interference due to less signals than the standard/legacy AM band. Though supported on most modern AM radio receivers sold in the Americas, this band is usually unavailable to older receivers except for those with substantial extended coverage. On such radios, the 1600-1700 segment was labeled "Police", since it was the original 'police radio' band. In the U.S., coverage on newer radios is mandated by the Federal Communications Commission (FCC), invoking the All-Channel Receiver Act.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「AM expanded band」の詳細全文を読む
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